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Underfrequency Load Shedding Report
Jerry Rust
WECC
October 21, 2010
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•NERC PRC-006-01
•WECC Consolidated Coordinated Plan
•Recommendations
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Automatic Underfrequency Load Shedding – WECC Focus● Preserve the existing WECC Consolidated
Coordinated Plan - Variance
● Applicable to Correct Entity UFLS entities – responsible for the ownership,
operation, or control of UFLS equipment (WECC-0065 Criterion)
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Automatic Underfrequency Load Shedding – WECC Focus● WECC Consolidated Coordinated UFLS Plan
13-page document posted for 30 days September 22, 2010 – closes October 22, 2010
Response to comments due back November 21, 2010
Is it complete? Did we miss something or miss-quote something?
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Automatic Underfrequency Load Shedding – WECC Focus● Some issues within the approved standard may
cause WECC OC and PCC to re-think implementation M.E.B.12. Each Planning Coordinator shall have
dated evidence such as reports, data gathered from an historical event, or other dated documentation to show that it participated in a UFLS design assessment per Requirements E.B.12 and E.B.4 if UFLS program deficiencies are identified in E.B.11
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Automatic Underfrequency Load Shedding – WECC Focus● E.B.11 Each Planning Coordinator in whose
area a BES islanding event results in system frequency excursions below the initializing set points of the UFLS program, shall participate in and document a coordinated event assessment with all affected Planning Coordinators to conduct and document an assessment of the event within one year of event actuation to evaluate: E.B.11.1. The performance of the UFLS equipment E.B.11.2. The effectiveness of the UFLS program
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Automatic Underfrequency Load Shedding – WECC Focus● So what does this mean
Compare to the simulations that established the plan and determine if the actual event did not match the simulations – why? What is wrong? What changed? Etc.
Does WECC have the simulation model that establish the plan – in the past an ad-hoc group does the simulation analysis. It is maintained and updated? Is it an operating case with reflection of reserve?
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Automatic Underfrequency Load Shedding – Recommendation● WECC form a permanent group to maintain the
simulation model and to be able to run a comparison analysis in the event it needs to be done. (maintain some kind of continuity of personnel) Reports to the JGC
Event Analysis has been under OC in the past
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Automatic Underfrequency Load Shedding – Implementation● Effective one year following the first day of the
first calendar quarter after applicable regulatory approvals. January 1, 2011 anticipated date
● Finish WECC-0065
● Address where and whom to maintain simulation
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Questions