SIS Negros Ph Solar Inc. 50 MW Solar Project.pdf

8/17/2019 SIS Negros Ph Solar Inc. 50 MW Solar Project.pdf

1/116

Draft Report

System Impact Study Report

50 MW Felisa Solar Power Project

Prepared for:

By:

Negros PH Solar Inc.

Barangay Felisa, Mansilingan, Bacolod City


2/116

EXECUTIVE SUMMARY

This System Impact Study (SIS) is conducted for the 50 MW Felisa Solar Power

Project of Negros Ph Solar Inc. (NPSI) in Brgy. Felisa Bacolod City. The proposed

connection for this project is a direct connection to Bacolod 138 kV Substation.

The project currently has a 200 MW capacity endorsed by the Department of Energy

(DOE) over phases. The developers have since identified suitable land sites and havemade the requisite arrangements with the landowners for long-term leases. Various

irradiation, flood, topography and soil studies have already been conducted with

positive results. In addition many of the local and national approvals and permits

have since been obtained including local LGU endorsements. Technical layouts and

routing plans have also been identified and secured.

Currently there might be some “anticipated constraint” in the submarine

interconnection between Negros and Cebu islands due to various projects being

planned for but many of which may not get implemented. In light of this ‘constraint”

the capacity of the project was reduced to 50 MW for this current phase for ease of

implementation.

This project has been developed and structured to allow for a quick expansion of

another 60 MW in Phase II. The key milestone for this expansion would be the

alleviation of the potential congestion along the Cebu-Panay submarine cable. This

alleviation would be evident when either the submarine cable is reinforced or when the

various other projects included in the base data is formally terminated.

In December 2014, Italy's Prysmian was awarded this US$111 million project by the

NGCP for the design, supply, installation, and commissioning of a submarine power

cable link to connect Negros and Panay islands in the Philippines. The CNP-1 cable

connection is the first stage of a larger development plan by NGCP, aimed at

h C b N d P l d h h d h h


3/116

Magalona on the Negros side. Delivery and commissioning is scheduled for the first

half of 2016. Phase II (60MW) of the solar plant will be implemented after CNP-1 iscommissioned.

In addition, in April 2015 NGCP announced plans to invest P1.6 billion to upgrade a

transmission facility in Cebu that forms part of a broader Visayan backbone project to

implement the Cebu substation 230 kilovolt (kV) upgrade project, this project

represents the second stage of the Cebu-Negros-Panay (CNP) 230 kV backbone project

further strengthening the grid in the Visayas. NGCP’s CNP project is generally

intended to accommodate all additional capacity from new power plants that will be

built in the Visayas.

With the anticipated alleviation in congestion, NPSI will be implementing the 60 MW

Phase II expansion of this solar in the second half of 2016 and request that this be

recognized for planning purposes.

Description Phase I

Phase II

(once CNP-1 is

completed or

when capacity

avails itself)

Size MW 50.00 60.00

Time Frame 2015/2016 2016/2017


4/116

This study was performed in accordance with the Philippines Grid Code (PGC) and

NGCP requirements. The purposes of this study are as follows:

1. Analyze the steady-state, stability, and short circuit conditions of the grid with

the project;

2. Determine any upgrades to the transmission system that would be required to

mitigate any adverse impacts that the project could otherwise pose on the

reliability and operating characteristics of the transmission system inaccordance with the PGC, NGCP standards and generally accepted

international transmission utility practices;

3.

Determine any upgrades required to mitigate any degradation to transmission

transfer capability; and

4. Determine any upgrades required to mitigate any degradation to system

dynamic stability.

The primary area of concern of this study is the area around NGCP’s Bacolod

Substation. Generated power from the proposed power plant will be transmitted to

Visayas grid through this substation.

In addition to the standard requirements of the PGC, the ERC had issued Resolution

No. 7 Series of 2013 imposing new requirements for intermittent power plants such as

this project. This proposed power plant should comply with those requirements,

compliance thereto should be demonstrated by field tests during testing and

commissioning.


5/116

S TEADY S TATE

Steady state thermal and voltage analyses were conducted to examine the comparative

system performance with and without the proposed project. The baseline performance

is based on the system without the proposed project. System performance was re-

evaluated with the project and compared with the baseline system. This approach

exposes the impact of the project on the system utilizing the criteria set by the PGC.

Steady state analysis was evaluated using a scenario where power plants at close

proximity to the project were dispatched to its maximum feasible levels for years 2016

and 2021. Peak load for 2016 and 2021 were respectively, 1,854.8 MW and 2,279.5

MW. Simulation at this dispatch scenario enabled the examination of the transmission

system to reliably operate with the proposed project integrated to the system.

Based on the steady state results the project’s connection to the grid poses no

significant adverse impact on the reliability and operating characteristics of Visayas

grid. There was no significant voltage or thermal violations of reliability criteria

associated with the entry of the project considering its priority dispatch incentive

under the RE Law.

S TABILITY

This evaluation consisted of application of faults on the system with the project using

peak base cases. The dynamic stability of the system during and after these faulted

conditions should conform to the requirements of the PGC. In addition, voltage,

frequency and power fluctuations or oscillations should dampen within the prescribedperiod. Machine angle should also exhibit acceptable coherence.

In all tested fault conditions the project would pose no significant adverse impact on

the stability of the system.


6/116

S HORT C IRCUIT

Short-circuit analysis was conducted to determine the impact of the project on the

existing fault current levels in all substations. In this study, it was assumed that fault

duty of the circuit breakers installed in the system are as follows:

Simulation results indicate that the entry of the proposed project will not result to

fault levels beyond the fault duties of the existing circuit breakers.

C ONCLUSION

This study revealed that the addition of NPSI’s Phase I, the 50 MW Felisa Solar Power

Project has no significant impact on the reliability, stability and operating

characteristics of the Visayas power transmission system.

The proposed power plant could be safely and reliably integrated to Visayas grid.

Phase II 60 MW of NPSI project will be implemented once CNP-1 is commissioned or

when there is capacity in the grid when other projects are do not materialize.

Volage Level

Rated Short

CircuitCurrent (kA)

69kV 230 kV 40


7/116

TABLE OF CONTENTS

Executive Summary

Steady State

Stability

Frequency Assessment

Short Circuit

Conclusion

1. Background Information ................................................................................................. 10

2. Study Assumptions ......................................................................................................... 12

A. Demand Forecast ..................................................................................................... 12

B. Generation Expansions ................................................................................................ 12

C. Transmission Expansions ......................................................................................... 14

D. Grid Code Requirements ......................................................................................... 15

3. Proposed Connection Arrangement and System Modelling ............................................ 19

4. Load Flow Assessment .................................................................................................... 23

A. Thermal Assessment – Adequacy in Normal Conditions (Peak Conditions) ........... 24

B. Thermal Assessment – Adequacy in Single Outage Conditions (Peak Conditions) ..... 25

C. Voltage Assessment in Normal Conditions (Peak) .................................................. 26

D. Voltage Assessment in Single Outage Condition (Peak Conditions) ....................... 27

5. Fault Level Analysis ....................................................................................................... 28

6. Stability Assessment ....................................................................................................... 30

7. Frequency Assessment .................................................................................................... 32


8/116

LIST OF TABLES

Table 1. Demand Projections for Visayas ............................................................................. 12

Table 2. Generator Capacity Additions for Visayas ............................................................. 13

Table 3. Power Circuit Breaker Fault Duty Rating ............................................................. 15

Table 4. Requirements at Different Frequency Range .......................................................... 17

Table 5. Lumped Generator Specifications ........................................................................... 20

Table 6. Generator Transformer Data .................................................................................. 21

Table 7. Transmission Line Data .......................................................................................... 21

Table 8. Dynamics Data for 50 MW Lumped Generator Units ............................................ 22

Table 9. Dynamics Data for the Electrical Controls ............................................................. 23

Table 10. 2016 Thermal Assessment (Peak, Normal Loading) ............................................. 24

Table 11. 2021 Thermal Assessment (Peak, Normal Loading) ............................................. 24

Table 12. 2016 Thermal Assessment (Peak, N-1 Loading) ................................................... 25

Table 13. 2021 Thermal Assessment (Peak, N-1 Loading) ................................................... 25

Table 14. 2016 Voltage Assessment (Peak, Normal Loading) ............................................... 26

Table 15. 2021 Voltage Assessment (Peak, Normal Loading) ............................................... 26

Table 16. 2016 Voltage Assessment (Peak, N-1 Loading) ..................................................... 27

Table 17. 2021 Voltage Assessment (Peak, N-1 Loading) ..................................................... 28

Table 18. Short Circuit Rating of Selected Substations in the Grid ..................................... 29

Table 19. Short Circuit MVA at Power Plant S/S (Peak Loading) ..................................... 29

Table 20. Summary of Dynamic Stability Simulations with Power Plant ............................ 31


9/116

LIST OF FIGURES

Figure 1. Generation Capacity Additions in Visayas ............................................................ 13

Figure 2. Transmission Expansion Projects in Visayas ......................................................... 14

Figure 3. Low Voltage Withstand Capability Requirement for Large Photovoltaic Systems 18

Figure 4. Connection Scheme for the Project ....................................................................... 19

Figure 5. Geographic Location of the Project ....................................................................... 20

Figure 6. Equivalent Model of the Grid in the Vicinity of the Project ................................. 22

Figure 7. Frequency Assessment, 2016 Peak Base Case ....................................................... 33

Figure 8. Frequency Assessment, 2021 Peak Base Case ....................................................... 33


10/116

1. BACKGROUND INFORMATION

Negros Ph Solar Inc. (NPSI) has embarked on developing this project by committing

significant resources and time to identify and secure key project specifics to ensure

project viability prior to applying for the various government permits and approvals.

This project has been under-development for the last 6 months with the proper siteselection and technical evaluation and local stakeholders’ engagement and relationship

building being developed to ensure project viability. The initial findings are very

optimistic. Necessary government permits were already secured.

This approach allows all the stakeholders, DOE, NGCP, Landowners, LGU’s, etc. to

have better comfort and visibility that our Service Contract will crystalize into a real

project and not remain “in development” for years.

NPSI is a wholly owned Filipino corporation and was set up to fully focus on developing

the Philippine Solar market. The founder Ms. Maricel Montfort, a highly successful

native of Cadiz and currently residing in Bacolod and Manila, is a long-standing citizen

who has had extensive working experience abroad and has returned back to the

Philippines to take an active part in improving the lives of the local Filipinos through

various infrastructure projects. Ms. Montfort is currently active with several large

infrastructure and social developments throughout the Philippines. These include

medical facilities, orphanages, water-treatment/purification projects and land &

property investments. Being a very successful business lady, she is able to fully fund

the professional and proper development of these projects.

NPSI has identified Bacolod City as a suitable site for the Solar project. Bacolod has

a stable climate with adequate sunlight throughout the year and minimal risk of heavy

typhoons or flooding. Land is plentiful and the local government agencies are

supportive of such an initiative


11/116

Land Status:

a) Identified and secured approximately 150 hectares with the landowners. Many

of the landowners are prominent local business people with good local standing.

Land Options have been signed for most of them and the rest will be complete

shortly and landowners are backing this project fully. NPSI has very good

relationships with all the landowners. In total NPSI aims to secure

approximately 280 hectares to build up to 200 MW.

b) NPSI had engaged professionals to conduct

•

Irradiation Studies

• Flood studies

•

Topographical surveys• Soil studies

• Connection routing and

• Plant layout design

The site has ideal road access and is relatively flat with little flood risk. The

lands will not be an inconvenience any inhabitants. The landlords havecommitted to ensure the site will be problem free and we will engage their local

individuals where possible.

c) The lands identified are outside the CARP jurisdiction and we have obtained

proper legal advice as well as advice from the local LGU’s on the proper

procedure to ensure that the site is Solar ready. This has already been factored

in our evaluation.

d) The land titles have also been checked for any risk of foreclosure or

encumbrances being attached.


12/116

The proposed connection would involve construction of approximately 3.5 km 138 kV

transmission line, a take-off substation at the power plant site and modifications at a

bay in Bacolod Substation to accommodate entry of the proposed power plant.

Conductors for this line should be 795 MCM ACSR equipped with appropriate

communication facility to convey revenue meter reading to NGCP’s Bacolod

Substation.

2.

STUDY ASSUMPTIONS

A. DEMAND FORECAST

Based on the 2013 Transmission Development Plan (TDP), there would relatively be

a significant increase in demand in Visayas Grid. Table 1 shows the demand

projections for the entire grid. Of greater interest for this proposed project is the

demand in Negros Island where the proposed facility will be injecting its power to the

grid. Bacolod Substation will be the main corridor of this project.

B. GENERATION EXPANSIONS

Table 1. Demand Projections for Visayas

Source: 2013 Transmission Development Plan


13/116

Figure 1. Generation Capacity Additions in Visayas

Table 2. Generator Capacity Additions for Visayas


14/116

C. TRANSMISSION EXPANSIONS

Major developments in Negros island included in the 2013 TDP are as follows:

1. Negros-Panay Interconnection Uprating

2. Negros V Transmission Line Project

3.

Visayas Substation Expansion I (Kabangkalan 1 x 50 MVA)

4.

Visayas Substation Reliability I (Amlan 1 x 50 MVA, Bacolod 1 x 100 MVA

and Cadiz 1 x 50 MVA)

These proposed developments shown in Figure 2 as well as generation expansions were

included in the base cases and were considered in the assessments.


15/116

D. GRID CODE REQUIREMENTS

The proposed project’s performance was evaluated based on the criteria set by the

Philippine Grid Code, utilizing grid dispatch scenario where power plants near the

project were set at maximum dispatch to reflect the worst impact of the project to the

grid. Steady state voltage and thermal analyses examined system performance without

the proposed project in order to establish a baseline data. System performance was

re-evaluated with the project and compared with the previous baseline performance todemonstrate the impact of the project on area transmission reliability.

The voltage limits adopted in this study were in compliance with the PGC which

requires that during normal and single outage contingency conditions, the voltage

should be within the range of 0.95 to 1.05 per unit. For the thermal limits, normal

thermal ratings shall not be violated under all-lines-in and single outage contingency

conditions. The steady state analysis was performed with both pre-contingency and

post-contingency solution parameters that allow adjustment of load tap-changing

transformers (LTCs), static var devices (SVDs) including switched capacitors and

phase angle regulators (PARs).

For short circuit studies, resulting three phase fault should not exceed the levels shown

in Table 3. These ratings are the standard fault duty rating of circuit breakers

connected to the grid.

Voltage Level

Rated Short Circuit Current

(kA)

69kV 230 kV 40

Table 3. Power Circuit Breaker Fault Duty Rating


16/116

1. The Grid remains stable after any Single Outage Contingency for all forecasted

Load conditions; and

2.

The Grid remains controllable after a Multiple Outage Contingency. In the

case of Grid separation, no total blackout should occur in any Island Grid.

In this study however, only stability under single outage contingency conditions were

evaluated.

Applied faults were cleared (normal clearing) in compliance with the requirements of

the PGC Section 4.5.2.3 as follows:

1. 85 ms for 500 kV;

2. 100 ms for 230 kV and 138 kV; and

3.

120 ms for voltages less than 138 kV

Delayed clearing were simulated in accordance with the requirements of the PGC

which states:

“The circuit breaker fail protection shall be designed to initiate the tripping of

all the necessary electrically-adjacent circuit breakers and to interrupt the faultcurrent within the next 50 milliseconds, in the event that the primary protection

system fails to interrupt the fault current within the prescribed Fault Clearance

Time”

In addition to the standard PGC requirements, the Energy Regulatory Commission

(ERC) had issued Resolution No. 7 series of 2013 entitled “Resolution Adopting and

Approving Addendum to Amendment No. 1 of the Philippine Grid Code, Establishing

the Connection and Operational Requirements for Variable Renewable Energy (VRE)

Generating Facilities”. Under Article II Section 2 of this addendum, additional

requirements for large photovoltaic generation systems were prescribed as follows:


17/116

Generating Limit Power Output

The proposed power plant should continuously supply active and reactive power

depending on the availability of primary source within the frequency range of 59.7-

60.3 Hz. It should be capable of interchanging reactive power at connection point

within ±5% voltage variation. Outside this range and up to ±10% voltage variation,

a reduction in active and/or reactive power may be allowed up to 5% of the generator’s

declared data.

Frequency Withstand Capability

Table 4 shows the allowable power plant frequency response.

Reactive Power Capability

The proposed power plant should be capable of supplying reactive power output at its

Table 4. Requirements at Different Frequency Range


18/116

Performance during Network Disturbances

The allowable voltage ride-through for the power plant is shown in Figure 3.

Voltage Control System

The proposed power plant shall be capable of contributing voltage control bycontinuous regulation of the reactive power supplied to the grid under power factor

control mode wherein power factor is maintained at the connection point or voltage

control mode wherein voltage at the high voltage busbar of the proposed power plant

is maintained at a constant set-point.

Figure 3. Low Voltage Withstand Capability Requirement for Large Photovoltaic

Systems


19/116

Power Quality

With the proposed power plant connected to the system and under normal operating

state, the Flicker Severity and Total Harmonic Distortion at the connection point shall

not exceed the values prescribed by the PGC

The proposed power plant will demonstrate compliance with these requirements

through testing to be conducted pursuant to Section 3.2.3.

3. PROPOSED CONNECTION ARRANGEMENT AND SYSTEM

MODELLING

In Figure 4 is shown the proposed connection for the project. This connection consistsof 138 kV transmission line directly connected to Bacolod 138 kV Substation. The

project will be equipped with a take-off substation at the power plant site connected

to a main bay at Bacolod Substation. The project’s geographic location is shown in

Figure 5.

Proposed Power Plant


20/116

The technical specifications used to model the proposed connection assets of NPSI

solar power plant project are shown in Table 5 to Table 7.

Power

C biliReactive Capability at

R k

Table 5. Lumped Generator Specifications

Figure 5. Geographic Location of the Project

3.5 km 138 kV transmission line

Take-off Substation


21/116

The grid model or base cases used in this study for years 2016 and 2021 were provided

by NGCP. Both base cases were derived from the Transmission Development Plan

and considered transmission line and generator expansion plans for the period covered.The scenario represented was peak loading condition, maximizing dispatch of power

plants in the vicinity of the project. Off-peak scenarios were not considered in the

assessment since the proposed power plant is not expected to operate during off-peak.

To reflect the priority dispatch scenario in the model, dispatch of conventional

synchronous machines in Negros and Panay areas were slightly reduced. In actualapplication, these conventional plants’ dispatch will vary due to the intermittence of

the proposed power plant. Power plants with adjusted dispatch are as follows:

1.) Palinpinon Geothermal Power Plant (Negros)

Description Tap RatioPresent

Tap

MVA

Rating

Tap

StepsR (pu)

X (pu)

based on

System

MVA

Grid

Transformers

22/138

D/YCenter 65 5 0 0.178620

Line Name Type LengthRate

(MVA)R (pu) X (pu) B (pu)

NPSI take-off –

138 kV tapping

138 kV, 795

MCMACSR

3.5 km 196 0.001580 0.008740 0.002290

Table 6. Generator Transformer

Table 7. Transmission Line Data


22/116

The 50 MW generator was modeled as lumped unit using “PVGU1” in the dynamic

stability study while the electrical controls was modelled as “PVEU1”. Parameters

for the models are shown in Table 8 and Table 9 respectively. Other system dynamics

data were provided by NGCP.

Figure 6. Equivalent Model of the Grid in the Vicinity of the Project

Proposed 50 MW

Solar Power Plant

Table 8. Dynamics Data for 50 MW Lumped Generator Units


23/116

4. LOAD FLOW ASSESSMENT

The results of the simulation for thermal adequacy are presented in Sections 4.A. and

4.B. while that for the voltages are shown in Sections 4.C. and 4.D.

Under normal loading conditions, considering the priority dispatch of intermittent RE

Generators, thermal loading of elements in the grid will remain within PGC required

limits. The number of grid loading violations during single-outage contingency

Table 9. Dynamics Data for the Electrical Controls


24/116

A. THERMAL ASSESSMENT – ADEQUACY IN NORMAL CONDITIONS

(PEAK CONDITIONS)

The results of the simulations are given in Table 10 and Table 11 for the 2016 and

2021 base cases respectively.

Monitored ElementMVA

Rating

Peak Load Condition

Without

Silay Solar

With

Silay Solar

MVA % MVA %

1 Solar Hi-Bacolod 138 kV 196.00 N/A 50.90 25.97

2 Samboan-Pondol 138 kV 108.04 84.91 78.59 93.47 86.51

3 Pondol-Amlan 138 kV 196.00 84.72 43.22 93.26 47.584 Amlan Hi-Amlan SP 196.00 132.92 67.82 152.74 77.93

5 Amlan-Mabinay 138 kV 196.00 15.33 7.82 24.71 12.61

6 Kabankalan-Bacolod 138 kV 196.00 10.64 5.43 20.00 10.20

7 Bacolod-E. B. Magalona 138 kV L1 196.00 20.20 10.31 14.44 7.37


9 EB Magalona-Barotac Viejo 138 kV 108.00 49.57 45.90 44.02 40.76

10 Barotac Viejo-Dingle 138 kV 196.00 47.40 24.18 57.33 29.2511 Barotac Viejo-Concepcion 138 kV 392.00 95.44 24.35 90.28 23.03


Rating

Peak Load Condition

Without

Silay Solar

With

Silay Solar

MVA % MVA %


2 Samboan Pondol 138 kV 108 04 69 60 64 42 89 32 82 67

Table 10. 2016 Thermal Assessment (Peak, Normal Loading)

Table 11. 2021 Thermal Assessment (Peak, Normal Loading)


25/116

B. THERMAL ASSESSMENT – ADEQUACY IN SINGLE OUTAGE

CONDITIONS (PEAK CONDITIONS)

Thermal N-1 adequacy assessments are given in and Table 12 and Table 13 for 2016

and 2021 base cases. The quantity of grid loading violations during this contingency

conditions essentially remained the same.


Rating

Peak Load Condition

Without

Silay Solar

With

Silay Solar

MVA % MVA %


2 Samboan-Pondol 138 kV 108.04 165.96 153.61 182.54 168.963 Pondol-Amlan 138 kV 196.00 164.93 84.15 181.44 92.57

4 Amlan Hi-Amlan SP 196.00 212.78 108.56 232.55 118.65

5 Amlan-Mabinay 138 kV 196.00 55.29 28.21 65.46 33.40

6 Kabankalan-Bacolod 138 kV 196.00 51.14 26.09 61.64 31.45



9 EB Magalona-Barotac Viejo 138 kV 108.00 98.30 91.02 69.33 64.1910 Barotac Viejo-Dingle 138 kV 196.00 94.75 48.34 116.50 59.44

11 Barotac Viejo-Concepcion 138 kV 392.00 190.35 48.56 180.17 45.96


Rating

Peak Load Condition

Without

Silay Solar

With

Silay Solar

MVA % MVA %

1 S l Hi B l d 138 kV 196 00 N/A 50 94 26 09

Table 13. 2021 Thermal Assessment (Peak, N-1 Loading)

Table 12. 2016 Thermal Assessment (Peak, N-1 Loading)


26/116

C. VOLTAGE ASSESSMENT IN NORMAL CONDITIONS (PEAK)

Voltage assessment conducted on the system indicated that the entry of the project

will not result to voltage violations in the grid. Table 14 and Table 15 present the

results of voltage assessment for the 2016 and 2021 base cases respectively.

Monitored Substations

Peak Load Condition

Without

Silay Solar

With

Silay Solar

(kV) (p.u.) (kV) (p.u.)

3 [NPHS_HI 138.000] N/A 1.0142 139.95

227601 COLON 138.00 136.80 0.9913 0.9903 136.66

227700 SAMBOAN 138.00 137.31 0.9950 0.9917 136.85

235500 BACOLOD 69.000 70.46 1.0212 1.0196 70.35

235501 BACOLOD 69.000 70.46 1.0212 1.0196 70.35

237100 PONDOL 138.00 138.48 1.0035 1.0017 138.23

237101 PONDOL 138.00 138.48 1.0035 1.0017 138.23

237200 AMLAN HI 138.00 137.99 0.9999 0.9984 137.78

237201 AMLAN SP 138.00 137.99 0.9999 0.9984 137.78

237300 MAB HI 138.00 138.86 1.0062 1.0042 138.58

237400 KABANKAL 138.00 139.35 1.0098 1.0078 139.08

237500 BACOLOD 138.00 140.18 1.0158 1.0143 139.97

237800 EBMAG1 138.00 140.90 1.0210 1.0213 140.94

237801 EBMAG2 138.00 141.06 1.0222 1.0211 140.91

247100 BTC VIEJ 138.00 141.20 1.0232 1.0217 140.99

247200 DINGLE 138.00 140.03 1.0147 1.0134 139.85

247700 CNCPCION 138.00 141.51 1.0254 1.0244 141.37

Table 14. 2016 Voltage Assessment (Peak, Normal Loading)


27/116

235501 BACOLOD 69.000 1.0074 69.51 1.0044 69.30

237100 PONDOL 138.00 1.0033 138.46 1.0003 138.04

237101 PONDOL 138.00 1.0033 138.46 1.0003 138.04237200 AMLAN HI 138.00 0.9991 137.88 0.9963 137.49

237201 AMLAN SP 138.00 0.9991 137.88 0.9963 137.49

237300 MAB HI 138.00 1.0032 138.44 0.9999 137.99

237400 KABANKAL 138.00 1.0052 138.72 1.0019 138.26

237500 BACOLOD 138.00 1.0084 139.16 1.0056 138.77

237800 EBMAG1 138.00 1.0183 140.53 1.0164 140.26

237801 EBMAG2 138.00 1.0215 140.97 1.0197 140.72247100 BTC VIEJ 138.00 1.0233 141.22 1.0216 140.98

247200 DINGLE 138.00 1.0107 139.48 1.0098 139.35

247700 CNCPCION 138.00 1.0330 142.55 1.0320 142.42

D.

VOLTAGE ASSESSMENT IN SINGLE OUTAGE CONDITION (PEAK

CONDITIONS)

Results of voltage assessment during contingency conditions are shown in Table 16

and Table 17 for the 2016 and 2021 base cases respectively. No deviations from the

PGC prescribed limits are expected upon the entry of the proposed project to the grid.


Peak Load Condition

Without

Silay Solar

With

Silay Solar

Min Max Min Max3 [NPHS_HI 138.000] N/A 0.9961 1.0242

227601 COLON 138.00 0.9754 0.9971 0.9748 0.9958

227700 SAMBOAN 138.00 0.9743 1.0043 0.9694 1.0035

235500 BACOLOD 69.000 0.9970 1.0326 1.0006 1.0304

Table 16. 2016 Voltage Assessment (Peak, N-1 Loading)


28/116

247200 DINGLE 138.00 1.0045 1.0210 1.0033 1.0203

247700 CNCPCION 138.00 1.0149 1.0282 1.0140 1.0280


Peak Load Condition

Without

Silay Solar

With

Silay Solar

Min Max Min Max

3 [NPHS_HI 138.000] 0.9612 1.0155

227601 COLON 138.00 0.9999 1.0132 0.9973 1.0107

227700 SAMBOAN 138.00 0.982 1.0042 0.9716 1.0028

235500 BACOLOD 69.000 0.964 1.0245 0.9574 1.0195

235501 BACOLOD 69.000 0.964 1.0245 0.9574 1.0195

237100 PONDOL 138.00 0.9888 1.0067 0.9862 1.0046

237101 PONDOL 138.00 0.9879 1.0067 0.9853 1.0046

237200 AMLAN HI 138.00 0.9879 1.0027 0.9853 1.0003

237201 AMLAN SP 138.00 0.9879 1.0027 0.9853 1.0003

237300 MAB HI 138.00 0.9805 1.01 0.9838 1.0075

237400 KABANKAL 138.00 0.9801 1.0153 0.9777 1.0125

237500 BACOLOD 138.00 0.9675 1.0199 0.9613 1.0155

237800 EBMAG1 138.00 0.9901 1.0279 0.9866 1.0262

237801 EBMAG2 138.00 0.9689 1.0287 0.9627 1.0259

247100 BTC VIEJ 138.00 1.0054 1.0301 1.0046 1.0275

247200 DINGLE 138.00 0.9941 1.0168 0.9975 1.0154

247700 CNCPCION 138.00 1.0221 1.0371 1.0217 1.0355

5. FAULT LEVEL ANALYSIS

Table 17. 2021 Voltage Assessment (Peak, N-1 Loading)


29/116

Substation

Peak Load Condition

Without

Silay Solar

With

Silay Solar

2016 2021 2016 2021

3 [NPHS_HI 138.000] N/A 13,807.40 N/A 13,540.00

237500 [BACOLOD 138.00] 8,279.20 8,143.70 8,361.50 8,009.80

235501 [BACOLOD 69.000] 10,118.20 9,956.30 10,200.30 9,779.30

235500 [BACOLOD 69.000] 10,118.20 9,956.30 10,200.30 9,779.30

237800 [EBMAG1 138.00] 6,700.40 6,613.40 6,730.80 6,472.00

237801 [EBMAG2 138.00] 9,896.80 9,761.90 10,025.70 9,658.50

247100 [BTC VIEJ 138.00] 10,450.30 10,307.70 10,599.50 10,218.90

247700 [CNCPCION 138.00] 9,917.10 9,806.70 10,073.60 9,773.70

247200 [DINGLE 138.00] 10,987.80 10,858.90 11,179.00 10,780.30

237400 [KABANKAL 138.00] 5,771.00 5,701.80 5,759.00 5,578.90

237300 [MAB HI 138.00] 5,737.40 5,679.60 5,712.20 5,559.60

237200 [AMLAN HI 138.00] 8,287.90 8,227.60 8,279.20 8,111.80

237201 [AMLAN SP 138.00] 8,287.90 8,227.60 8,279.20 8,111.80

237100 [PONDOL 138.00] 7,434.40 7,379.90 7,417.20 7,266.50

227700 [SAMBOAN 138.00] 7,453.70 7,388.90 7,448.20 7,273.00

227601 [COLON 138.00] 20,813.60 20,750.50 22,803.90 22,552.80

Short Circuit MVA and X/R

at Solar 69kV Bus

Peak Load Condition2016 2021

MVA X/R MVA X/R

1,650.15 4.8616 1,618.19 4.43667

Table 18. Short Circuit Rating of Selected Substations in the Grid

Table 19. Short Circuit MVA at Power Plant S/S (Peak Loading)


30/116

6. STABILITY ASSESSMENT

Stability analysis assessed the impact of the project to the transient stability

performance of the grid. The analysis was based on the assumptions and methodology

described in the previous sections. The stability plots are included in the Appendices.

The 3-phase faults were applied on transmission line segments followed by

tripping/outage of the segments at normal and delayed clearing times.

The segments where faults were applied are as follows:

1. Fault at Solar Hi-Bacolod 138 kV Line with Tripping

2. Fault at Bacolod-EBMAG1 138 kV Line with Tripping

3.

Fault at Bacolod-EBMAG2 138 kV Line with Tripping4. Fault at Bacolod-Kabankalan 138 kV Line with Tripping

5. Fault at Bacolod 138/69 kV Transformer (T2) with Tripping

6.

Fault at Bacolod-BRGS TAP 69 kV Line with Tripping

7. Fault at Bacolod 138/69 kV Transformer (T1) with Tripping

8. Fault at Kabankalan-Mabinay HI 138 kV Line with Tripping

9.

Fault at Amlan HI-Mabinay HI 138 kV Line with Tripping

Bus faults applied to the system are as follows:

1. Bus Fault at NPHS_HI 138 kV Bus (3)

2.

Bus Fault at BACOLOD 138 kV Bus (237500)

3. Bus Fault at EBMAG1 138 kV Bus (237800)

4.

Bus Fault at EBMAG2 138 kV Bus (237801)

5 Bus Fault at KABANKAL 138 kV Bus (237400)


31/116

The results of the stability simulation indicated acceptable response of the system

parameters with the proposed facility integrated, damping mostly within the first ten

(10) seconds after the application of fault. The summary of dynamic stability

simulations is shown in Table 20 for scenarios with the power plant.

Applied Fault

Status of Grid

2016 Base Case 2021 Base Case

Normal

Clearing

Delayed

Clearing

Normal

Clearing

Delayed

Clearing

BUS FAULTS

1.

Bus Fault at NPHS_HI 138 kV Bus (3) Stable Stable Stable Stable

2. Bus Fault at BACOLOD 138 kV Bus (237500)Stable Stable Stable Stable

3.

Bus Fault at EBMAG1 138 kV Bus (237800)Stable Stable Stable Stable

4. Bus Fault at EBMAG2 138 kV Bus (237801)Stable Stable Stable Stable

5. Bus Fault at KABANKAL 138 kV Bus (237400)Stable Stable Stable Stable

6.

Bus Fault at MAB HI 138 kV Bus (237300)Stable Stable Stable Stable

7. Bus Fault at AMLAN SP 138 kV Bus (237201)Stable Stable Stable Stable

8.

Bus Fault at DINGLE 138 kV Bus (247200) Stable Stable Stable Stable

LINE FAULTS

1. Fault at Solar Hi-Bacolod 138 kV Line with TrippingStable Stable Stable Stable

2 F lt t B l d EBMAG1 138 kV Li ith T i i

Table 20. Summary of Dynamic Stability Simulations with Power Plant


32/116

6. Fault at Bacolod-BRGS TAP 69 kV Line with

Tripping Stable Stable Stable Stable

7.

Fault at Bacolod 138/69 kV Transformer (T1) with


8.

Fault at Kabankalan-Mabinay HI 138 kV Line with


9.

Fault at Amlan HI-Mabinay HI 138 kV Line with


7.

FREQUENCY ASSESSMENT

Frequency assessment evaluates if the loss of the proposed power plant will not cause

the frequency to drop below 59.4 Hz frequency limit set by PGC. For 2016 and 2021

base cases, the frequency will not fall as low as 59.4 Hz. The outage of the proposed

power plant will not result to Automatic Load Dropping (ALD). Figure 7 and Figure

8 shows the results of frequency assessments for 2016 and 2021 base cases respectively.


33/116

Figure 7. Frequency Assessment, 2016 Peak Base Case


34/116

8. SUMMARY AND CONCLUSIONS

This study was conducted to assess the impact of the proposed 50 MW Felisa Solar

Power Project on the reliability, stability and operating characteristics of the Visayas

Grid. Steady state, stability and short-circuit conditions were analyzed. Proposed

connection for this project is a direct connection to Bacolod 138 kV Substation.

Steady state assessment with the project in-service showed no significant voltage or

thermal violations of reliability criteria. Considering the priority dispatch of

intermittent RE Generators, thermal loading of elements in the grid will remain within

PGC required limits.

Short circuit analyses concluded that the project did not alter adversely the short

circuit duties of the baseline system.

Transient stability assessment simulated a set of faults. None of the faults tested

showed unstable response of the system with the project integrated.

Frequency assessment showed that the system frequency will not drop as low as 59.4

Hz with the outage of the proposed power plant. Automatic Load Dropping is not

expected during this loss-of-generation scenario.

As a general conclusion, this System Impact Study revealed that the addition of NPSI’s

first project phase, the 50 MW Felisa Solar Power Project has no significant system

impact to the stability, reliability, and operating characteristics of the Visayas Grid.

The proposed project could be safely and reliably integrated to Visayas. Subsequent

phases of the project will be implemented upon NGCP’s reinforcement of thesubmarine interconnection.


35/116

APPENDICES


36/116

Appendix A

2016 Bus Fault Normal Clearing


37/116


38/116


39/116


40/116


41/116


42/116


43/116


44/116


45/116

Appendix B

2016 Bus Fault Delayed Clearing


46/116


47/116


48/116


49/116


50/116


51/116


52/116


53/116


54/116

Appendix C2016 Line Fault Normal Clearing


55/116


56/116


57/116


58/116


59/116


60/116


61/116


62/116


63/116


64/116

Appendix D2016 Line Fault Delayed Clearing


65/116


66/116


67/116


68/116


69/116


70/116


71/116


72/116


73/116


74/116

Appendix E2021 Bus Fault Normal Clearing


75/116


76/116


77/116


78/116


79/116


80/116


81/116


82/116


83/116

Appendix F2021 Bus Fault Delayed Clearing


84/116


85/116


86/116


87/116


88/116


89/116


90/116


91/116

Appendix G

2021 Li F l N l Cl i


92/116

2021 Line Fault Normal Clearing


93/116


94/116


95/116


96/116


97/116


98/116


99/116


100/116


101/116

Appendix H

2021 Line Fault Delayed Clearing


102/116


103/116


104/116


105/116


106/116


107/116


108/116


109/116


110/116


111/116

Appendix I

Power Flow Plots


112/116

2016 Peak Base Case, Normal Loading, Without the Proposed Plant


113/116

2016 Peak Base Case, Normal Loading, With the Proposed Plant


114/116

2021 Peak Base Case, Normal Loading, Without the Proposed Plant


115/116

2021 Peak Base Case, Normal Loading, With the Proposed Plant


116/116

Documents

SIS Negros Ph Solar Inc. 50 MW Solar Project.pdf