Estimating Available Capacity for New Generators

Jonathan RosePlanning Engineer,Resource Integration Dept. Regional Planning GroupSeptember 24, 2013

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Goal: Provide Better Information for Generation

Developers

ERCOT Resource Integration Dept.

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Providing a Tool for Prospective Generation Developers

Generation Interconnection Process Observations•Many generation developers unfamiliar with transmission network.

– Buy maps from 3rd party vendors. Do not know the rating (or voltage) of lines.

– Often request a screening study in an obviously under-sized transmission location.

– Sometimes request “investigative” screening studies just to understand transmission.

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• Program written by Jonathan Rose.• Performs a “pseudo” screening study at every

bus in ERCOT system.• Estimates transmission capacity available for

new generators.• Results are tabulated by bus.• Envision making results public.

Introducing: Available Capacity Program

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• Report will be published with many disclaimers:

– Analysis less comprehensive than an ERCOT Screening Study.

– Analysis performed in Steady State only.– Errors may exist. SPSs and RAPs were not modeled.– Use at your own risk.– Recommend use only as informal guidance.

Disclaimers…

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Sample Map – 345 kV Network

Available Transmission Capacity in North Texas

Sample

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Sample Tabular Results

Bus BusNameFCITC (MW) Limiting Constraint Contingency

240 WHITNEY5 <10 37410 TNLKWHITNY1 138 3546 WHITNEY__8 138 1 241 WHITNEY8 138 3546 WHITNEY__8 138 1246 BOSQUESW5 <10 37410 TNLKWHITNY1 138 3546 WHITNEY__8 138 1 241 WHITNEY8 138 3546 WHITNEY__8 138 1393 CONCORD 299.7 393 CONCORD 345 394 CONCORD8 138 2 DB_ID_15863: VENUS_N5-JHNSONSW_P5 & VENUS_N5-575 JCKCNTY5 2000 No Limit646 LEWISVLSW5_2 1275.1 2437 FRNY1_5 345 2433 SGVLSW1_5 345 1 2361 CRLTN_NW1_5 345 2387 HACKBRY1_5 345 1967 GIBN_CREK_5 1392.3 967 GIBN_CREK_5 345 44645 SNGLTN_345 345 75 967 GIBN_CREK_5 345 44645 SNGLTN_345 345 99970 BENDAVIS_5 <10 12439 CNVLSW_W8R 138 2920 GARLDPL2_8 138 1 DB_ID_11745: CENTERVILLE SW-EAST ZACHA975 JKCREEK1 1669.4 975 JKCREEK1 345 967 GIBN_CREK_5 345 2 DB_ID_15655: TWIN_OAK N__5 - GIBN_CREK_5 & 988 W_DENT_5 558.3 918 TEASLEY138 138 917 POCKRUS138 138 1 DB_ID_15902: WEST DENTON (TMPA) - KRUM WEST 345

1016 ODEHV3T_5 1084.2 1030 MRGNCRK_5 345 11048 TONKAWAW_5 345 1 DB_ID_11435: BITTERCR5_1N - SWEETEAST_5 & 1018 MOSS_5 960.6 1129 WESTOVER_8 138 1130 AMOSFOST_8 138 1 DB_ID_13109: MOSS_5 - ODEHVD_5 & PERMIANB_5 -

Available Capacity Shown for New Generators

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• For each bus…

How Results Calculated

Add prospective generator at bus.Add prospective generator at bus.

Perform FCITC Transfer AnalysisScale up prospective unit.

Scale down faraway gas generation.

Perform FCITC Transfer AnalysisScale up prospective unit.

Scale down faraway gas generation.

Scale up nearby generators.Scale up nearby generators.

Calculate and save constraints.Calculate and save constraints.

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How Does it Work?

Python Code

MS Access

Database

MS Access

DatabaseTARA

PSS/E

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• Planning analysis tool similar to MUST.– Used by ERCOT Planning & Res. Integration.

• Can perform security-constrained economic dispatch.

• Good for reporting sensitivities & shift factors.

• http://www.power-gem.com/TARA.htm

What is TARA? (Since people may not be familiar…)

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QUESTIONS?