TRANSMISSION OPERATION ISSUES FOR CROSS-BORDER ENERGY TRADE FOR BANGLADESH

Presented By

Md Iqbal Azam DGM Grid Circle Dhaka

Power Grid Company of Bangladesh Ltd

Bangladesh at a Glance

bull Official Name Peoplersquos Republic of

Bangladesh

bull Political System Parliamentary Democracy

bull Population 148 million

bull Area 147570 km2

bull Time Zone GMT+6 Hours

bull GDP total USD 112 bill (FY2011)

bull GDP Per Capita USD 755 (FY 2011)

bull Total Exports USD 23 billion (FY2011)

bull Total Imports USD 34 billion (FY2011)

bull Foreign Reserve USD 12 billion (Jan 2011)

bull Major Maritime Ports Chittagong Mongla

bull Currency BDT (1 BDT = USD 0014)

bull Major Cities Dhaka Chittagong Khulna

Sylhet Rajshahi Barisal

Dialing Code +880

INDIA

CHINA

DHAKA

KHULNA

RAJSHAHI

SYLHET

CHITTAGONG

BARISAL

INDIA

INDIA

INDIA

200 miles

500 km

2

Present Power Sector of Bangladesh

bull Installed Generation Capacity 8099 MW (June 2012)

bull Total Consumers 13 Million

bull Transmission Lines 8600 km

bull Distribution Lines 278000 km

bull Per Capita Generation 265 kWh

Present Power Demand

bull Access to Electricity 53

bull Peak Demand 6600 MW

bull Daily Peak Generation 5300-5600 MW

bull Daily Load Shedding 1000-1300 MW

bull Electricity Growth 12 (FY-2012) (Av 7 since 1990)

Present Structure of Power Sector

5

Apex Institution Power Division Ministry of Power Energy amp Mineral Resources (MPEMR)

Regulator Bangladesh Energy Regulatory Commission (BERC)

Generation Bangladesh Power Development Board (BPDB) Ashuganj Power Station Company Ltd (APSCL)

Electricity Generation Company of Bangladesh (EGCB)

North West Power Generation Company Ltd (NWPGCL)

Independent Power Producers (IPPs)

Transmission Power Grid Company of Bangladesh Ltd (PGCB)

Distribution Bangladesh Power Development Board (BPDB) Dhaka Power Distribution Company (DPDC)

Dhaka Electric Supply Company Ltd (DESCO)

West Zone Power Distribution Company (WZPDCO)

Rural Electrification Board (REB) through Rural Co-operatives

6

Public Sector

SL Generation Capacity (MW)

1 BPDB 3483

2 APSCL 662

3 EGCB 210

Subtotal 4355 (54 )

Private Sector

1 IPPs 1272

2 SIPPs (BPDB) 99

3 SIPPs (REB) 226

4 15 YR Rental 168

5 35 YR Rental 598

6 Quick Rental 1381

Subtotal 3744 (46 )

Total 8099

Present Generation Capacity (May 2012)

Considering 20 Maintenance and Forced Outage Available Generation Capacity is about 6400 MW without fuel constraint

Energy Generation by Fuel Type

7

Hydro 242

Natural Gas 7879

Furnace Oil 1078

Diesel 557 Coal

245

Total Net Generation (July11-April 12) 28673 MkWh

Daily Load Curve of 22nd July 2012

GAS

P GEN(GAS)

PGEN(OIL)

COAL

HydroOIL

SHORTAGE

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

7000

000200

400600

8001000

12001400

16001800

20002200

2400

Hour

MW

GAS PGEN(GAS) PGEN(OIL) COAL Hydro OIL SHORTAGE

Total energy Gen 123755 MkWh

Energy not served 000 MKWHr

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Bangladesh at a Glance

bull Official Name Peoplersquos Republic of

Bangladesh

bull Political System Parliamentary Democracy

bull Population 148 million

bull Area 147570 km2

bull Time Zone GMT+6 Hours

bull GDP total USD 112 bill (FY2011)

bull GDP Per Capita USD 755 (FY 2011)

bull Total Exports USD 23 billion (FY2011)

bull Total Imports USD 34 billion (FY2011)

bull Foreign Reserve USD 12 billion (Jan 2011)

bull Major Maritime Ports Chittagong Mongla

bull Currency BDT (1 BDT = USD 0014)

bull Major Cities Dhaka Chittagong Khulna

Sylhet Rajshahi Barisal

Dialing Code +880

INDIA

CHINA

DHAKA

KHULNA

RAJSHAHI

SYLHET

CHITTAGONG

BARISAL

INDIA

INDIA

INDIA

200 miles

500 km

2

Present Power Sector of Bangladesh

bull Installed Generation Capacity 8099 MW (June 2012)

bull Total Consumers 13 Million

bull Transmission Lines 8600 km

bull Distribution Lines 278000 km

bull Per Capita Generation 265 kWh

Present Power Demand

bull Access to Electricity 53

bull Peak Demand 6600 MW

bull Daily Peak Generation 5300-5600 MW

bull Daily Load Shedding 1000-1300 MW

bull Electricity Growth 12 (FY-2012) (Av 7 since 1990)

Present Structure of Power Sector

5

Apex Institution Power Division Ministry of Power Energy amp Mineral Resources (MPEMR)

Regulator Bangladesh Energy Regulatory Commission (BERC)

Generation Bangladesh Power Development Board (BPDB) Ashuganj Power Station Company Ltd (APSCL)

Electricity Generation Company of Bangladesh (EGCB)

North West Power Generation Company Ltd (NWPGCL)

Independent Power Producers (IPPs)

Transmission Power Grid Company of Bangladesh Ltd (PGCB)

Distribution Bangladesh Power Development Board (BPDB) Dhaka Power Distribution Company (DPDC)

Dhaka Electric Supply Company Ltd (DESCO)

West Zone Power Distribution Company (WZPDCO)

Rural Electrification Board (REB) through Rural Co-operatives

6

Public Sector

SL Generation Capacity (MW)

1 BPDB 3483

2 APSCL 662

3 EGCB 210

Subtotal 4355 (54 )

Private Sector

1 IPPs 1272

2 SIPPs (BPDB) 99

3 SIPPs (REB) 226

4 15 YR Rental 168

5 35 YR Rental 598

6 Quick Rental 1381

Subtotal 3744 (46 )

Total 8099

Present Generation Capacity (May 2012)

Considering 20 Maintenance and Forced Outage Available Generation Capacity is about 6400 MW without fuel constraint

Energy Generation by Fuel Type

7

Hydro 242

Natural Gas 7879

Furnace Oil 1078

Diesel 557 Coal

245

Total Net Generation (July11-April 12) 28673 MkWh

Daily Load Curve of 22nd July 2012

GAS

P GEN(GAS)

PGEN(OIL)

COAL

HydroOIL

SHORTAGE

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

7000

000200

400600

8001000

12001400

16001800

20002200

2400

Hour

MW

GAS PGEN(GAS) PGEN(OIL) COAL Hydro OIL SHORTAGE

Total energy Gen 123755 MkWh

Energy not served 000 MKWHr

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Present Power Sector of Bangladesh

bull Installed Generation Capacity 8099 MW (June 2012)

bull Total Consumers 13 Million

bull Transmission Lines 8600 km

bull Distribution Lines 278000 km

bull Per Capita Generation 265 kWh

Present Power Demand

bull Access to Electricity 53

bull Peak Demand 6600 MW

bull Daily Peak Generation 5300-5600 MW

bull Daily Load Shedding 1000-1300 MW

bull Electricity Growth 12 (FY-2012) (Av 7 since 1990)

Present Structure of Power Sector

5

Apex Institution Power Division Ministry of Power Energy amp Mineral Resources (MPEMR)

Regulator Bangladesh Energy Regulatory Commission (BERC)

Generation Bangladesh Power Development Board (BPDB) Ashuganj Power Station Company Ltd (APSCL)

Electricity Generation Company of Bangladesh (EGCB)

North West Power Generation Company Ltd (NWPGCL)

Independent Power Producers (IPPs)

Transmission Power Grid Company of Bangladesh Ltd (PGCB)

Distribution Bangladesh Power Development Board (BPDB) Dhaka Power Distribution Company (DPDC)

Dhaka Electric Supply Company Ltd (DESCO)

West Zone Power Distribution Company (WZPDCO)

Rural Electrification Board (REB) through Rural Co-operatives

6

Public Sector

SL Generation Capacity (MW)

1 BPDB 3483

2 APSCL 662

3 EGCB 210

Subtotal 4355 (54 )

Private Sector

1 IPPs 1272

2 SIPPs (BPDB) 99

3 SIPPs (REB) 226

4 15 YR Rental 168

5 35 YR Rental 598

6 Quick Rental 1381

Subtotal 3744 (46 )

Total 8099

Present Generation Capacity (May 2012)

Considering 20 Maintenance and Forced Outage Available Generation Capacity is about 6400 MW without fuel constraint

Energy Generation by Fuel Type

7

Hydro 242

Natural Gas 7879

Furnace Oil 1078

Diesel 557 Coal

245

Total Net Generation (July11-April 12) 28673 MkWh

Daily Load Curve of 22nd July 2012

GAS

P GEN(GAS)

PGEN(OIL)

COAL

HydroOIL

SHORTAGE

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

7000

000200

400600

8001000

12001400

16001800

20002200

2400

Hour

MW

GAS PGEN(GAS) PGEN(OIL) COAL Hydro OIL SHORTAGE

Total energy Gen 123755 MkWh

Energy not served 000 MKWHr

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Present Power Demand

bull Access to Electricity 53

bull Peak Demand 6600 MW

bull Daily Peak Generation 5300-5600 MW

bull Daily Load Shedding 1000-1300 MW

bull Electricity Growth 12 (FY-2012) (Av 7 since 1990)

Present Structure of Power Sector

5

Apex Institution Power Division Ministry of Power Energy amp Mineral Resources (MPEMR)

Regulator Bangladesh Energy Regulatory Commission (BERC)

Generation Bangladesh Power Development Board (BPDB) Ashuganj Power Station Company Ltd (APSCL)

Electricity Generation Company of Bangladesh (EGCB)

North West Power Generation Company Ltd (NWPGCL)

Independent Power Producers (IPPs)

Transmission Power Grid Company of Bangladesh Ltd (PGCB)

Distribution Bangladesh Power Development Board (BPDB) Dhaka Power Distribution Company (DPDC)

Dhaka Electric Supply Company Ltd (DESCO)

West Zone Power Distribution Company (WZPDCO)

Rural Electrification Board (REB) through Rural Co-operatives

6

Public Sector

SL Generation Capacity (MW)

1 BPDB 3483

2 APSCL 662

3 EGCB 210

Subtotal 4355 (54 )

Private Sector

1 IPPs 1272

2 SIPPs (BPDB) 99

3 SIPPs (REB) 226

4 15 YR Rental 168

5 35 YR Rental 598

6 Quick Rental 1381

Subtotal 3744 (46 )

Total 8099

Present Generation Capacity (May 2012)

Considering 20 Maintenance and Forced Outage Available Generation Capacity is about 6400 MW without fuel constraint

Energy Generation by Fuel Type

7

Hydro 242

Natural Gas 7879

Furnace Oil 1078

Diesel 557 Coal

245

Total Net Generation (July11-April 12) 28673 MkWh

Daily Load Curve of 22nd July 2012

GAS

P GEN(GAS)

PGEN(OIL)

COAL

HydroOIL

SHORTAGE

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

7000

000200

400600

8001000

12001400

16001800

20002200

2400

Hour

MW

GAS PGEN(GAS) PGEN(OIL) COAL Hydro OIL SHORTAGE

Total energy Gen 123755 MkWh

Energy not served 000 MKWHr

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Present Structure of Power Sector

5

Apex Institution Power Division Ministry of Power Energy amp Mineral Resources (MPEMR)

Regulator Bangladesh Energy Regulatory Commission (BERC)

Generation Bangladesh Power Development Board (BPDB) Ashuganj Power Station Company Ltd (APSCL)

Electricity Generation Company of Bangladesh (EGCB)

North West Power Generation Company Ltd (NWPGCL)

Independent Power Producers (IPPs)

Transmission Power Grid Company of Bangladesh Ltd (PGCB)

Distribution Bangladesh Power Development Board (BPDB) Dhaka Power Distribution Company (DPDC)

Dhaka Electric Supply Company Ltd (DESCO)

West Zone Power Distribution Company (WZPDCO)

Rural Electrification Board (REB) through Rural Co-operatives

6

Public Sector

SL Generation Capacity (MW)

1 BPDB 3483

2 APSCL 662

3 EGCB 210

Subtotal 4355 (54 )

Private Sector

1 IPPs 1272

2 SIPPs (BPDB) 99

3 SIPPs (REB) 226

4 15 YR Rental 168

5 35 YR Rental 598

6 Quick Rental 1381

Subtotal 3744 (46 )

Total 8099

Present Generation Capacity (May 2012)

Considering 20 Maintenance and Forced Outage Available Generation Capacity is about 6400 MW without fuel constraint

Energy Generation by Fuel Type

7

Hydro 242

Natural Gas 7879

Furnace Oil 1078

Diesel 557 Coal

245

Total Net Generation (July11-April 12) 28673 MkWh

Daily Load Curve of 22nd July 2012

GAS

P GEN(GAS)

PGEN(OIL)

COAL

HydroOIL

SHORTAGE

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

7000

000200

400600

8001000

12001400

16001800

20002200

2400

Hour

MW

GAS PGEN(GAS) PGEN(OIL) COAL Hydro OIL SHORTAGE

Total energy Gen 123755 MkWh

Energy not served 000 MKWHr

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

6

Public Sector

SL Generation Capacity (MW)

1 BPDB 3483

2 APSCL 662

3 EGCB 210

Subtotal 4355 (54 )

Private Sector

1 IPPs 1272

2 SIPPs (BPDB) 99

3 SIPPs (REB) 226

4 15 YR Rental 168

5 35 YR Rental 598

6 Quick Rental 1381

Subtotal 3744 (46 )

Total 8099

Present Generation Capacity (May 2012)

Considering 20 Maintenance and Forced Outage Available Generation Capacity is about 6400 MW without fuel constraint

Energy Generation by Fuel Type

7

Hydro 242

Natural Gas 7879

Furnace Oil 1078

Diesel 557 Coal

245

Total Net Generation (July11-April 12) 28673 MkWh

Daily Load Curve of 22nd July 2012

GAS

P GEN(GAS)

PGEN(OIL)

COAL

HydroOIL

SHORTAGE

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

7000

000200

400600

8001000

12001400

16001800

20002200

2400

Hour

MW

GAS PGEN(GAS) PGEN(OIL) COAL Hydro OIL SHORTAGE

Total energy Gen 123755 MkWh

Energy not served 000 MKWHr

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Energy Generation by Fuel Type

7

Hydro 242

Natural Gas 7879

Furnace Oil 1078

Diesel 557 Coal

245

Total Net Generation (July11-April 12) 28673 MkWh

Daily Load Curve of 22nd July 2012

GAS

P GEN(GAS)

PGEN(OIL)

COAL

HydroOIL

SHORTAGE

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

7000

000200

400600

8001000

12001400

16001800

20002200

2400

Hour

MW

GAS PGEN(GAS) PGEN(OIL) COAL Hydro OIL SHORTAGE

Total energy Gen 123755 MkWh

Energy not served 000 MKWHr

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Daily Load Curve of 22nd July 2012

GAS

P GEN(GAS)

PGEN(OIL)

COAL

HydroOIL

SHORTAGE

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

7000

000200

400600

8001000

12001400

16001800

20002200

2400

Hour

MW

GAS PGEN(GAS) PGEN(OIL) COAL Hydro OIL SHORTAGE

Total energy Gen 123755 MkWh

Energy not served 000 MKWHr

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Grid Infrastructure

230kV Line 2647 ckt km

132kV Line 6148 ckt km

230132kV SS 15 (7225 MVA)

13233kV SS 100 (10702 MVA)

Bangladesh Grid

Network

Year 2012

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Power System Master Plan (up to 2030)

Updates of PSMP 2006 Due to change of planning

perspective

PSMP 2010 Long term planning up to 2030

Study completion February 2011

Findings

- Generation capacity requirement by 2021 24000 MW

- Generation capacity requirement by 2030 39000 MW

- Coal based generation capacity by 2030 20000 MW

- Coal and Nuclear for base load power requirement

- Cross Boarder Trade with neighboring countries

10

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Probable Power Generation Primary Fuel Sources by 2030

Sl

No Description Capacity (MW) Probable Location (s)

1 Domestic Coal 11250 North West Region at Mine Mouth

2 Imported Coal 8400 Chittagong and Khulna

3 Domestic GasLNG 8850 Near Load Centers

4 Nuclear 4000 Ruppur

5 Regional Grid 3500

Bahrampur - Bheramara Agartola -

Comilla Silchar - Fenchuganj

Purnia-Bogra Alipurduar ndash Bogra

Myanmar - Chittagong

6 Others (Oil Hydro

and Renewable) 2700

Near Load Centers

Total 38700

11

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

SAARC Regional Co-operation

Participation of Bangladesh

Possible Areas of Co-operation Import of Power from India

Seasonal Power Co-operation (Based on demand variation and

hydro generation availability at Summer amp Winter)

Import of Power from Bhutan amp Nepal through India

Development of Joint Venture power generation projects specially

Hydro power projects in North-eastern part of India and power

transfer to Bangladesh and West-Bengal

Development of Joint Venture Power Generation Projects in

Bhutan amp Nepal in co-operation with India and subsequent import

of power from those projects

Human Resource Development Co-operation

Development of Engineering ampTechnical Co-operation

12

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

COMILLA (N)

FENCHUGANJ

SILCHAR FENCHUGANJ

BHERAMARA BAHARAMPUR

BAHARAMPURBHERAMARA

PURNIA BOGRA

THAKURGAON

500MW [2013-]

500MW [2018-]

1000MW

250MW

750MW

Regional Power Exchange Possibilities

PALLATANA COMILLA (N)

MYANMAR CHITTAGONG

500 MW

ALIPURDUAR BOGRA

1000MW

13

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

According to PSMP-2010 6 cross border interconnection

options for Bangladesh

Name of Interconnection

Power Import (MW) by Year

2015 2020 2025 2030

Bheramara Bahrampur 500 500 1000 1000

Mayanmar Bangladesh 0 500 500 500

Palatana Comilla 0 0 250 250

Shilchar Fenchuganj 0 0 750 750

Purnia Bogra

(Hydro Power from Nepal)

0 0 500 500

Alipurduar Bogra

(Hydro Power from Bhutan)

0 0 500 500

Advanced initiatives can be taken to connect Bangladeshi system with Nepal

amp Bhutan through Indian Grid Network before 2020

Possible Interconnections Bangladesh

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

15

400 kV Power

Transmission

Routes for 2030

Bangladesh

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Bangladesh ndash India Co-operation

Progress Made So Far Bangladesh-India signed MOU to promote technical bilateral co-

operation in power sector development

Salient Features of MOU

Exchange of power

Grid connectivity between the two countries

NTPC amp BPDB signed an MOU for mutual co-operation for

development of Power Sector in Bangladesh

Salient Features of MOU

Setup of a 1320 MW coal based power plant in Bangladesh

Human Resources Development and

Enhancement of productivity and efficiency of their existing

power stations

16

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

17

Bangladesh ndash India Co-operation Progress Made So Far

Joint technical team proposed an interconnection between Bheramara in

Bangladesh and Baharampur in India

Establishment of 400 KV 120 km double circuit line from Bheramara to

Baharampur and back-to-beck HVDC sub station at Bheramara is under

progress

500 MW power import by 2013

PPA for 250 MW power from NTPC has already been signed

Draft Feasibility Study Report on Khulna 1320 MW coal based power plant

finalized

Joint Venture Agreement between BPDB and NTPC signed on 29 January

2012

Plant will be commissioned by 2016

A Joint technical committee has been formed in the 4th steering committee

meeting for Eastern Interconnection between Bangladesh amp India

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Bangladesh ndash India Nepal Bhutan Co-operation

Potential Regional Energy Co-operation under Considerations

Power Trade from Bhutan to Bangladesh with a tripartite

agreement with India and Bhutan

Interconnection between India amp Bangladesh grid through

Alipurduar to Bogra can expedite cross border electricity

trade

Bangladesh-India-Nepal Joint Venture Investment in Hydro

Power Project in Nepal

Import power from Nepal to Bangladesh through Indian

territory providing wheeling charge to eastern regional grid

of India

18

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Conduct feasibility study to identify suitable sites for large scale

hydro based power generation

Conduct detailed study on the feasibility of a Electricity grid and

a regional power market

Needs to adopt relevant legal and regulatory measures in

respective countries to establish lsquoRegional Power Marketrsquo

Multilateral Regional bodies and other energy related

institutions should extend technical and financial Co-operation

Needs to identify win-win options for sustainability of Regional

Co-operation

Strong Political will is key to move forward towards Regional

Energy Co-operation to ensure energy security in this region for

overall socio-economic benefit 19

Challenges and Issues

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

BASIC HVDC AND

CONVERTER OPERATION

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

HVDC

bull A high-voltage direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power in contrast with the more common alternating current systems

bull The modern form of HVDC transmission uses technology developed extensively in the 1930s in Sweden at ASEA

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Comparison With HVAC

SI No

Features HVAC HVDC

1 Power transmission capacity

Low High

2 Distance Limited by stability consideration

No limitation

3 System connection Synchronous Asynchronous

4 Right of way requirement High Low

5 Power control No Yes

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Comparison With HVAC

SI No

Features HVAC HVDC

6 Frequency control No Yes

7 Reactive power control No Yes

8 Tapping connection Simple Costly

9 Economic Lower to medium distance

Long distance

10 Pollution effects Relatively less More pronounced

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

COST AC vs DC Transmission

Terminal Cost AC

Terminal Cost DC

Line Cost DC

Line Cost AC

Break Even Distance

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

HVDC Transmission Principle

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

SINGLE PHASE HALF WAVE RECTIFIER

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

SINGLE PHASE FULL

WAVE RECTIFIER

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

SINGLE PHASE FULL WAVE BRIDGE RECTIFIER

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

6-Pulse Convertor Bridge

3

6

C i L s

4

E 1 L s

L s

B i

i A

1

2

I

V d

5

V d

I d d L

d

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Voltage and Current of an Ideal Diode 6 Pulse Converter

Alpha = 0

Overlap = 0

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

bull Triggering can be delayed from a point which is called firing angle α

bull Output voltage of the converter is controlled by controlling the α ndash Rectifier action

bull If α gt 90ordm negative voltage is available across the bridge ndash Inverter action

bull Due to finite transformer inductance current transfer from one thyristor valve to the other cannot take place instantly

bull This delay is called over lap angle μ and the reactance called commutating reactance This also causes additional drop in the voltage

Operation of Converter

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

12-Pulse Convertor Bridge

Y

Commonly Used in HVDC systems

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

bull Commonly adopted in all HVDC applications

bull Two 6 pulse bridges connected in series

bull 30ordm phase shift between Star and Delta windings of the converter transformer

bull Due to this phase shift 5th and 7th harmonics are reduced and filtering higher order harmonics is easier

bull Higher pulse number than 12 is not economical

12-Pulse Converter Bridge

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

HVDC Link Voltage Profile

I R

DC CABLE or OH LINE

I E d r d

RECTIFIER

dio R V

I X 2

d c

cos

r I E d

L I X 2 d c

cos

V dio I

INVERTER

VdR=VdioR cos-Id Xc+Er VdI=VdioI(cos-Id Xc+Er

2 2

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Control of DC Voltage

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

Power FlowAC System DC System

V 1 V 3 V 5

V 2V 6V 4

Phase A

Ud

Phase B

Phase C

Id

AC System DC SystemPower Flow

30 60 90 120 150 180

0

+Ud

-Ud

160

5

Rectifier

Operation

Inverter

Operation

Rectifier Operation Inverter Operation

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

BASIC HVDC Single Line Diagram

DC OH Line

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

DC Filter DT 1224 DT 1236

DC Filter DT 1224 DT 1236

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Current

Bi-pole

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Earth Return

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Modes of Operation

DC OH Line

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters Reactors

Smoothing Reactor

Converter

Transformer

Thyristor

Valves

400 kV AC Bus

AC Filters

Smoothing Reactor

Current

Mono Pole Metallic Return

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Back to Back

Modes of Operation

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

System Related Controls

Active Power Control

Reactive Power Control

Islanded Mode amp Steering into Islanded Mode

Control Logic to prevent self-excitation

Frequency Control

Power modulation

Power Limit functions Run Back Controls

SSR Controller

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Reliability Issues for Back to Back HVDC Station

bull Provides an interconnection between two neighboring AC Grids

bull Controls power exchange in direction magnitude quickly automaticallyas per system requirement

bull Short circuit level of both grids remains unchanged

bull Frequency disturbances do not get transferred from one AC grid to another

bull Stability of both AC grids can be improved

bull Stronger AC grid can stabilize weaker AC grid

bull Power can be exchanged accurately and quickly

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Basic Control Concepts

DC Line

α γ

Current Reference Voltage Reference

Inverter Rectifier

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

AC Harmonic Filter Performance Requirements

Individual harmonic distortion Di 1

Total harmonic distortion (rms) Dt 3

Telephone influence factor TIF 30

Generator harmonic current content Ig 1

Arithmetic sum of 5th and 7th harmonic currents in any generator Ig57 06

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

System Protection-Zones

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Overview of Bangladesh

Interconnection with India

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

The issue Cross Border Electrical Interconnection between

India and Bangladesh have been discussed from long

before but it has got momentum during the visit of Four

memberrsquos Indian delegations headed by Joint Secretary

Power to Bangladesh from 22nd November to 26th

November 2009

After that MOU was signed between the Governments of

Bangladesh amp India for Cooperation in Power Sector on 11

Jan 2010

Overview

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Keeping in view the technical consideration and reliable operation of both the

System Baharampur (India)ndashBheramara (Bangladesh) option was taken for

implementation after several visit amp study by the joint technical committee

Total Scope of the Project

1 Establishment of 400kV Switching Station at Baharampur (India)

by LILO of Farakka-Jeerat 400kV single circuit line

2 Baharampur (India) ndash IshurdiBheramara (Bangladesh) 400kV

double circuit line (85km in Indian part amp 30km in Bangladesh)

3 Installation of HVDC back-to-back station (400230 kV) at

IshurdiBheramara (Bangladesh)

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Bangladesh (Bheramara)-India (Baharampur) Grid

Interconnection with HVDC

a) Objectives (i) To Facilitate exchange of electricity between Bangladesh amp India

(ii) To establish a Grid Interconnection with India

(iii) To minimize the power crisis in Bangladesh to some extent

b) Main Components (BD part) i) 30 km 400 kV double ckt transmission line

ii) 400 kV Back-to-Back HVDC station at Bheramara

c) Project Cost (BD Part) Total =Tk 107869 Crore

F C = Tk 70000 Crore

L C = Tk 37869 Crore

d) Financing ADB Tk 700 Crore

GOB Tk 27724 Crore

PGCB Tk 10145 Crore (FC Tk 3454 Cr)

e) Project Completion Year 2012-13

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Interconnection with Bheramara

Bahrampur

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

BOGRASOUTH

BHERAMARA

NAOGAON

NIAMATPUR

FARRAKA

SUBHASGRAM

KATWA

GOKARNA

JEERAT

KHULNA(SOUTH)

BOTTAIL

BAHARAMPUR

CH NAWABGANJ

RAGHUNATHGANJ

KA

HA

LG

AO

N

SAGARDIGHI

RAJSHAHI

BAHARAMPUR

ISHURDI

NATORE

KHEJURIA

FARIDPUR

BAGHABARI

GHORASAL

MA

DH

OP

UR

SHAHJAD

PABNAPUR

SIRAJGANJ

BOGRA

INTERCONNECTION BETWEEN INDIA AND BANGLADESH GRIDS

400 kV230 kV132 kV

THE PROJECT

LEGEND

BAKRESHWAR

KOLAGHAT

BANGLADESH

INDIA

400kV Dc

(400 KV)

MALDA

DHULIAN

DURGAPUR

Existing

Under Constr Future

JAYPURHAT BARAPUKURIA

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Schematic Diagram of Grid Interconnection between Bangladesh (Bheramara) and India (Baharampur)

230 kV

Bheramara

400 kV from

India

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

DC Station Control 1048707 Perform station-related HVDC functions 1048707 DC switchyard control 1048707 AC Filter Sub-Bank Control Reactive Power Control 1048707 Co-ordination and changeover of Control Level (System Station Control Level) 1048707 Co-ordination and changeover of Control Locations for HVDC 1048707 SIMATIC TDC based 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with Pole Control via FO links

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

AC Station Control 1048707 Control and monitoring of AC switchyard and aux power supply system 1048707 Operation of circuit breakers and disconnections related to the HVDC feeders on request from HVDC control system 1048707 Evaluation of Last Line and Last Breaker conditions for HVDC poles 1048707 SICAM PAS based 1048707 Serial data exchange with Bay Control Units 6MD66 and Protection Relays using IEC 61850 1048707 Serial data exchange with AC HMI through Ethernet 1048707 Serial data exchange with HVDC controls through IEC 60870-5-101 protocol (using RCI as communication gateway)

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Pole Control 1048707 Pole Level functions 1048707 Current Order Calculation (Pole individual I-mode) 1048707 Power Order Calculator for pole level modulation controls 1048707 Operating mode selection (P-mode I-mode) switchover features 1048707 Pole-Pole Power Transfer (PPT) for future Pole 2 1048707 Current Order Setting Functions 1048707 Pole Start Stop Sequences 1048707 Tap changer control 1048707 Control switching devices in Valve Hall

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Pole Control (cont) 1048707 Converter Level Functions 1048707 DC voltage current and extinction angle control 1048707 Trigger set and interface to thyristor valves via Valve Base Electronic 1048707 Sub synchronous resonances (SSR) damping control (if required) 1048707 Block Deadlock sequences 1048707 ESOF FASOF sequences 1048707 SIMATIC TDC based 1048707 Serial data exchange with CampP Measuring System through optical TDM bus 1048707 Serial data exchange with Bay Control Units 6MD66 through Field bus 1048707 Serial data exchange with DC HMI RCI controls via redundant LAN1 LAN2 1048707 High speed serial data exchange with DC Station Control via FO links

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Protection Systems 1048707 DC Protection Completely redundant configuration (duplicated system) using SIMATIC TDC both systems include main and backup functions 1048707 Converter Transformer Protection-Duplicated with additional backup protection using standard numerical protection relays 1048707 Shunt Reactor Protection-Main back-up configuration using standard numerical protection relays 1048707 AC Filter Protection-Sub-bank main protection using SIMATIC TDC and standard numerical protection relays (backup) 1048707 AC Bus Bar Protection-Duplicated (Main 1 Main 2) numerical bus-bar protection

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

CampP Measuring System 1048707 Provides current and voltage quantities to the

Pole Controls and DC Protections 1048707 Zero Flux DC current Measurement 1048707 Terminals for CT and voltage tap circuits of

converter transformers and for inductive VT in converter feeders

1048707 Calculation of gamma based on end-of-current signals from VBE

1048707 Pre-processing of measured values for Pole Control and DC Protection

1048707 SIMATIC TDC based 1048707 Serial data exchange with Pole Control and DC

Protection through optical TDM bus

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Transmission line (400kV 30km amp 230kV 05km)

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 30-Dec-2010 (effective from 01-March- 2011)

bull Completion time August 2012

bull Contractor Cobra (Spain)

bull Contract value FC ndash9428 MUSD

LCndashTk 35996 Cr

bull Route Alignment Survey completed

bull Plan Profile Approved (excluding the termination towers)

bull Work Plan submitted amp work is going on as per work plan

bull Planned profile for LILO of 230kV Ishurdi Khulna Line under

verification

bull Overall physical progress 17

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

HVDC Station (400-230kV 500 MW) at Bheramara Bangladesh

bull Tender Invited on 28-Feb-2010

bull Contract awarded on 29-March-2011 (effective from 01-June-2011)

bull Completion time May 2013

bull Contractor Siemens Germany

bull Contract value FC -76622 MEURO

LC ndash Tk 15697 Cr

bull Single Line Diagram approved

bull Draft Layout approved

bull Drawing Submission started

bull Some Drawings approved

bull Soil Resistivity Test started

bull Overall physical progress 165

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Bangladesh India Grid Interconnection Project

Update of Bangladesh part

Land Acquisition amp Development for HVDC Station at Bheramara

bull Total Land Area 113 Acre

bull Land Acquisition Completed

bull Land Development Under way (67 Completed)

bull Approach Road Completed

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

Grid Interconnection Project

04 07 2011

Earth Filling

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

64

Site Development works of HVDC Sub-station

03 July 2012

03 July 2012 03 July 2012

03 July 2012

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

65

Piling Work of 400kV TL Cross Border Interconnection Project

28 June 2012

28 June 2012 28 June 2012

28 June 2012

THANKS TO

ALL

THANKS TO

ALL