3 Automatic Underfrequency Load Shedding – WECC Focus Preserve the existing WECC Consolidated Coordinated Plan - VarianceApplicable to Correct EntityUFLS entities – responsible for the ownership, operation, or control of UFLS equipment (WECC-0065 Criterion)
4 Automatic Underfrequency Load Shedding – WECC Focus WECC Consolidated Coordinated UFLS Plan13-page document posted for 30 days September 22, – closes October 22, 2010Response to comments due back November 21, 2010Is it complete? Did we miss something or miss-quote something?
5 Automatic Underfrequency Load Shedding – WECC Focus Some issues within the approved standard may cause WECC OC and PCC to re-think implementationM.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
6 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 The performance of the UFLS equipmentE.B The effectiveness of the UFLS program
7 Automatic Underfrequency Load Shedding – WECC Focus So what does this meanCompare 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?
8 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 JGCEvent Analysis has been under OC in the past
9 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 dateFinish WECC-0065Address where and whom to maintain simulation