IEEE Soirée Technique 2014 Far-shore HVAC Grid · PDF file · 2014-11-24IEEE Soirée Technique 2014 Far-shore HVAC Grid Connections ... Onshore Substation 275 / 132 kV including

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IEEE Soirée Technique 2014

Far-shore HVAC

Grid Connections Etienne Lemaire, Engineering Manager

CG Systems Division Belgium

KULeuven , 29/10/2014


Agenda

1. Introduction CG Systems Division

2. Offshore References

3. The Gemini Project (NL)

4. Grid Code Compliance

5. Optimisation of Availability


CG Power in the energy business

›Global Company Overview


CG Power

Power transformers

Gas Insulated Switchgear

Air Insulated

Switchgear

Distribution transformers

Control & Protection

Turn-Key Projects

Operation & Maintenance

Motors & Drives

Products for Generation, Transmission and Distribution


Systems Division, Belgium : Turn-key solutions

Outdoor Substations

Indoor Substations

Onshore Windsubs

Offshore Windsubs

Modular Substations

Mobile Substations


• “Turn-key” Solutions:

• Financial engineering

• Design & engineering

• Equipment supply

• Construction

• Testing & Energization

• Operation and

Maintenance

CG POWER – Systems Division

6


Mobile Substation 220 – 63 – 33,5 kV 30 MVA


Mobile Substation 220 – 63 – 33,5 kV 30 MVA


Mobile substation on site

9


Conventional Substation 132 – 33 kV 23 MVA


Modular Substation 36, 30, 15, 11 and 10 kV


Modular Substation 36, 30, 15, 11 and 10 kV


14

Offshore Projects


Location: 45 km from the Belgian Coast

Client: Van Oord Marine Contractors (NL)

Size: 165 MW, 55 turbines

Start date: August 2009

Completion date: August 2010

Belwind Offshore WF (BE)

Project Overview:

Offshore High Voltage Substation

2 x 155 / 33 kV - 1 x 200 MVA

150 kV link to the shore

CG Scope:

Engineering & design of HV electrical system

Electrical System Studies (Belgian Grid Code

Compliance)

Supply & installation of HV electrical equipment

Commissionig of HV electrical system


Location: 8 Km east off the Yorkshire Coast, in the North-East of England

Client: E.ON Climate and Renewables (UK)


Start date: December 2011

Completion date: February 2014

Humber Gateway Offshore WF (UK)

Project Overview:

Dual Offshore High Voltage Substation

2 x 132 / 33 kV - 2 x 140 MVA

Onshore S/S - 2 x 275 / 132 / 33kV – 160 MVA

Connected to National Grid at 275 kV

CG Scope:

Engineering, design, supply, installation & commissionig

of HV & SCADA systems

Offshore Substation 132 / 33 kV

Onshore Substation 275 / 132 kV including reactive

power compensation

UK Grid Compliance Engineering


Location: North Sea, 38km north of the Island Helgoland

Client: E.ON Climate and Renewables (D)


Start date: December 2011

Completion date: October 2014

Amrumbank West offshore WF (Germany)

Project Overview:


2 x 155 / 33 / 33 kV – 2 x 180 MVA

155 kV link to HVDC HelWin beta platform

CG Scope:

Offshore Substation 155 / 33 kV


Electrical System Studies (German Grid Code

Compliance)




Location: 23 km from the Dutch Coast

Client: Van Oord Marine Contractors (NL)


Start date: August 2012

Completion date: Mid 2015

Luchterduinen Offshore WF (NL)

Project Overview:


2 x 155 / 33 kV - 2 x 80 MVA


CG Scope:


Electrical System Studies (Dutch Grid Code

Compliance)




19

The Gemini Project


100 km off the Dutch Coast (Eemshaven)

Water depth : 28m – 36m

2 zones : ZeeEnergie + Buitengaats

2 x 300 MW, 150 turbines (SWT 4.0)

OHVS : Mid 2014 Mid 2016

220kV AC Export Cables

Injection onshore at 380kV

Tennet Grid Code

33kV Turbine back-up system if no 220kV

High availability of the grid connection

Contractual agreement on transmission

losses.

Project Boundaries


FICG

Project Organisation


Combined competences

Client

JV FICG

Design, Delivery & Installation of OHVS

• Project management

• Engineering & fabrication of

OHVS topside

• Transport & installation

• Auxiliaries O&M

• Engineering & supply of HV

electrical system

• Electrical System Studies

• HV O&M

• Engineering & fabrication of

steel structures

• Foundations & piles

• Topside steel structure


Gemini Offshore WF (NL)

Project Overview:

2 x Offshore High Voltage Substation (Each)

TX: 2 x 220 / 33-33 kV - 170 MVA

RX: 1 x 220 kV – 115 MVAr (Cable Comp)


Onshore High Voltage Substation

TX: 2 x 220/380 kV – 330 MVA

RX: 2 x 220 kV – 115 MVAr (Cable Comp)

RX: 2 x 33 kV – 63 MVAr (Grid compliance)

CG Scope:


Electrical System Studies (Dutch Grid Code Compliance)


Commissioning of HV electrical system


http://geminiwindfarm.com/innovation/


25

Grid Connection Design


Tennet Grid Code

At the PCC the overall HV grid connection needs to comply with

MVAR capability

Transients (3% on VRMS)

Harmonics

Dynamic Behaviour

…

Initially only HVDC was considered as technically feasible and therefore tendered,

however …


CAPEX HVAC vs HVDC

Total CAPEX cost of the grid connection including

Topside

HV cables

Installation

…

Based on

Internal offshore data+

ENSTO-e

! Spread on input data

! J I J O


Gemini Grid Connection

Proposed solution :

Utilise the MVAR capability of the 150 full-converter SWT (they are as fast as an

STATCOM !)

Perform the coarse regulation with onshore 33kV reactors and capacitor banks

Operate with permanent MVAR compensation at both ends of the 220kV cable

Energize the onshore transformer, the 220kV reactors and the 220kV cable in one

operation to avoid operation in forbidden zone

Ensure to comply at all times with the cable’s boundary conditions (current + voltage)

Innovation funded by : In cooperation with :


MVAR regulation


The Export Cable Ampacity

The current-carrying capacity of the HV cable varies over its length.

The grid connection system has to ensure to stay within the allowable ampacity limits

even in emergency cases.



Case : One onshore reactor out of service.



Case : One onshore Transformer out of service


Dynamic behaviour of wind farm

Mvar controller: simulated dynamic response of 150 individual wind turbines

50 Mvar step response on PCC: stable in 4 seconds :

Voltage control mode (droop control): behaviour on voltage setpoint changes


Simultaneous energisation of:

• Onshore transformer

• 63 Mvar onshore reactor 33 kV

• 115 Mvar onshore reactor 220 kV

• 108 km Export Cable 220 kV

• 115 Mvar offshore reactor 220 kV

TenneT RMS voltage deviation on

most stringent line voltage

= 1.47% (<3%)

Full system energizing

including remanent flux on the transformer


Point-of-wave switching

Power network stability

Reductions of:

electrical switching transients

equipment failures

maintenance costs on the apparatus

Operate the circuit breaker at a precise electrical moment What ?

Why ?

How ? Controls the exact moment the circuit breaker is operated:

Reduces inrush currents

Eliminates the high voltage switching transients

Reduce the circuit breaker maintenance costs

Improve the components’ reliability

Provides extended circuit breaker monitoring:

Detection of C/B degradation of performance

Detection of mechanical/electrical problems


2 PU

4 PU

Delayed control strategy Uncontrolled switching Rapid closing strategy (peak)


Thanks !

[email protected]

Documents

IEEE Soirée Technique 2014 Far-shore HVAC Grid · PDF file · 2014-11-24IEEE Soirée Technique 2014 Far-shore HVAC Grid Connections ... Onshore Substation 275 / 132 kV including