1 / 14

NERC Event Analysis Update

NERC Event Analysis Update. Member Representatives Committee Meeting October 28, 2008 Robert W. Cummings NERC Director of Event Analysis & Information Exchange. Active Event Analysis Teams. MRO System Separation – Sept. 18, 2007 Writing final report

valorief
Download Presentation

NERC Event Analysis Update

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NERC Event AnalysisUpdate Member Representatives Committee Meeting October 28, 2008 Robert W. CummingsNERC Director of Event Analysis & Information Exchange

  2. Active Event Analysis Teams • MRO System Separation – Sept. 18, 2007 Writing final report • FRCC South Florida Disturbance – Feb. 26, 2008 Writing final report • RFC PEPCO Disturbance – June 13, 2008 RFC Event Analysis Team – collecting data • SPP Southwestern Public Service Company Separation – June 17, 2008

  3. Ongoing & Emerging Trends

  4. Emerging & Ongoing Trends • Unexpected Generator Turbine Control Action (31) • Voltage sensitivity of generation auxiliary power systems (13) • Transmission equipment failures (11) • Human Error (8) • Protection system misoperation (8) • Near-term load forecasting error (6) • Wiring errors (6) • Inter-area oscillations (5) • Protection equipment failures (4) • System Integrity Protection Scheme Misoperations (SPS & RAS) (4) • Generation vs transmission protection miscoordination (3) • Lack of Redundancy (3)

  5. Emerging & Ongoing Trends • Loss of station observability (SCADA) (3) • Relay loadability (3) – 1 of these was in Europe • Relay settings (drifting) (3) • Relays / controls out-of-date with manufacturers’ tech. bulletins (3) • Uncoordinated load restoration (3) • Handling of missing/bad data by EMS systems (2) • Failed or run-away operation of substation automation (2) • Gas supply / gen. dispatch coordination (2) • Line hardware / conductor failures (2) • Protection system design errors / misapplications (2) • SCADA system misoperation (1)

  6. EA Trends – Top Two DisturbanceElements • 31 – Unexpected generator turbine control actions • 28 in 7 events since August 2007 (and counting) • 2 units CAUSAL in a system separation event • 13 – Voltage sensitivity of generation auxiliary power systems (not included above) • Problem: THESE BEHAVIORS ARE NOT MODELED OR STUDIED • Turbine controls (non-governor) are not modeled • Typically only analyzing t = 0 to t = 20 seconds

  7. Generator – System Interface Issues System Conditions Trans Protection Gen Protection Gen Controls Turbine / Boiler Controls System Controls PRC-001 Coordination

  8. System Protection Performance Improvement Initiative

  9. Protection & Control Performance Issues • Relay Loadability • Standard PRC-023 – Relay Loadability passed by NERC Board, awaiting FERC approval • Protection System Redundancy • SPCTF White Paper & SAR – December • PRC Standards Technical Support • Protection misoperation analysis, maintenance, etc. • Protection System Coordination • Trans & Gen Protection Coordination – IEEE collaboration • Transmission Protection Coordination • System Performance & Protection Coordination with Turbine/Boiler Controls

  10. Protection & Control Performance Issues • Elevate System Protection and ControlsTask Force to Subcommittee status • Increased emphasis on the importance of system protection • Collaborative efforts with • IEEE Power & Energy Society • IEEE Power System Relay Committee • Bridge between IEEE standards and NERC system performance requirements (in NERC standards)

  11. System ModelingImprovement Initiative

  12. Modeling Issues • If something in not modeled, how can you predict system behavior or interaction???? Dynamics Modeling Issues • Missing models • Data errors • Models may not match field equipment and settings • Issue of “proprietary models” • No models for many wind farms • No good indication of where wind farms are connected • Registrations issues

  13. Need for New Modeling • Turbine / boiler control models needed • Units may remain stable, but ramp to zero and trip • Far more complex dynamic load models needed to analyze and predict FIDVR (Fault-Induced Delayed Voltage Recovery) behavior • More load composition data needed to do this • Better governor models • Better SPS/RAS models • Models for new power electronic devices

  14. Questions?

More Related