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Project 2007-01 Underfrequency Load Shedding PRC-006, 007 and 009

Overview of Project 2007-01 aiming to revise 3 standards related to Underfrequency Load Shedding and improve performance following an event. Detailed objectives, current direction, regional performance requirements, characteristics, and status/schedule provided.

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Project 2007-01 Underfrequency Load Shedding PRC-006, 007 and 009

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  1. Project 2007-01Underfrequency Load SheddingPRC-006, 007 and 009 Bob Millard ReliabilityFirst staff Reliability Standards Workshop April 29-30, 2008

  2. OverviewUnderfrequency Load Shedding Project 2007-01 • Revise 3 standards related to Underfrequency Load Shedding (UFLS): • PRC-006: Develop & Document Regional Reliability Organization UFLS Program • PRC-007: Assure Consistency with Regional UFLS Programs • PRC-009: Analyze & Document UFLS Performance Following an Underfrequency Event Note: PRC-008, UFLS Maintenance & Testing was transferred to Project 2007-17 NERC Standards Workshop 4/29, 30/08

  3. UFLS SDT RosterUnderfrequency Load Shedding Project 2007-01 • Dana Cabbell — Southern California Edison Co. (Chair) • Paul Attaway — Georgia Transmission Corporation • Brian Bartos — Banders Electric Cooperative • Larry E. Brusseau — Midwest Reliability Organization • Jonathan Glidewell — Southern Co. Transmission • Geral Keenan — Bonneville Power Administration • Robert W. Millard — ReliabilityFirst Corporation NERC Standards Workshop 4/29, 30/08

  4. UFLS SDT Roster (Continued)Underfrequency Load Shedding Project 2007-01 • Steven Myers — Electric Reliability Council of Texas • Mak Nagle — Southwest Power Pool • Robert J. O'Keefe — American Electric Power • Philip Tatro — National Grid • Robert Williams — Florida Municipal Power Agency • David Taylor — NERC NERC Standards Workshop 4/29, 30/08

  5. ObjectiveUnderfrequency Load Shedding Project 2007-01 • Eliminate “fill-in-the-blank” characteristics RRO responsibilities (currently present in PRC-006) • Determine whether UFLS “program” requirements should be continent-wide and/or regional (related to PRC-006 and 007) • Consider effectiveness & infra structure existing • Consider implementation concerns • Determine how to address event reporting (currently in PRC-009) NERC Standards Workshop 4/29, 30/08

  6. Current DirectionUnderfrequency Load Shedding Project 2007-01 • Various combinations of “load steps” & “frequency set points” can achieve objective. • Current programs repeatedly studied for effectiveness. • Changing to one “program” would take time & money. • APPROACH - Identify performance characteristics/requirements for developing regional reliability standards. NERC Standards Workshop 4/29, 30/08

  7. Regional Performance RequirementsUnderfrequency Load Shedding Project 2007-01 • Direct development of Regional Standards for implementing automatic UFLS to arrest & recover declining system frequency. Each Regional Standard shall address the following UFLS performance requirements: • Frequency decline shall be arrested at no less than 58.0 Hz. • Frequency shall not remain below 58.5 Hz for greater than 10 seconds, cumulatively, and shall not remain below 59.5 Hz for greater than 30 seconds, cumulatively. NERC Standards Workshop 4/29, 30/08

  8. Regional Performance CharacteristicsUnderfrequency Load Shedding Project 2007-01 • Frequency overshoot resulting from operation of UFLS relays shall not exceed 61.0 Hz for any duration and shall not exceed 60.5 Hz for greater than 30 seconds, cumulatively. • Bulk Electric System voltage during and following UFLS operations shall be controlled such that the per unit Volts per Hz (V/Hz) will not exceed 1.18 for longer than 6 seconds cumulatively, and will not exceed 1.10 for longer than 1 minute cumulatively. • Functional Entities responsible for developing, analyzing and implementing the “program” shall be identified. NERC Standards Workshop 4/29, 30/08

  9. Current DirectionUnderfrequency Load Shedding Project 2007-01 • Analysis & reporting of an “event” is not unique to UFLS • Past standards required “event” information be submitted to NERC • ERO responsible for System oversight • APPROACH – Administer “event” through ERO Rules of Procedure and relationship with Regional Entities NERC Standards Workshop 4/29, 30/08

  10. Status & Schedule • Draft standard ready to post for 45 day comment period • Response to comments and repost as appropriate • Provide direction for development of Regional Standards early 2nd quarter 2008 • Propose completion of Regional Standards approximately 18 months later • Process through NERC and FERC – available for formal implementation 2 – 2 ½ yrs from now NERC Standards Workshop 4/29, 30/08

  11. Questions?Underfrequency Load Shedding Project 2007-01 • Dana Cabbell (Chair), Southern California Edison Co. • dana.cabbell@sce.com • David Taylor, NERC Standards Coordinator • David.Taylor@nerc.net NERC Standards Workshop 4/29, 30/08 11

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