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WECC Planning Committee Underfrequency Load Shedding Review Group Update

WECC Planning Committee Underfrequency Load Shedding Review Group Update. March 25, & 26, 2014. UFLSRG. Underfrequency Load Shedding Review Group (UFLSRG) Philip Augustin Richard Hydzik Jerry Rust Kent Bolton Danny Johnson Hari Singh Desmond Chan Gerald Keenan Dede Subakti

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WECC Planning Committee Underfrequency Load Shedding Review Group Update

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  1. WECC Planning CommitteeUnderfrequency Load SheddingReview Group Update March 25, & 26, 2014

  2. UFLSRG Underfrequency Load Shedding Review Group (UFLSRG) • Philip Augustin Richard Hydzik Jerry Rust • Kent Bolton Danny Johnson Hari Singh • Desmond Chan Gerald Keenan Dede Subakti • Eleanor Ewry Stephanie Lu Branden Sudduth • Roy Gearhart Grace Martinez Shilpa Toppo • Irina Green Chris Pink Mike VanRemoortere • Mark Hanson Steve Rueckert Gregory Vassallo

  3. After a disturbance – loss of generation - what happens? Devices respond to a frequency change • Frequency sensitive load – motors • Frequency sensitive generation – governors • Automatic Generation control – AGC • Contingency Reserve Deployment – generation, curtailment interruptible load, etc. • Other measures

  4. Typical WECC Frequency Excursion Point A Point B Point C Seconds

  5. After a disturbance – loss of generation - what happens? If frequency is still declining then what?

  6. Purpose of UFLS Last automatic protection scheme to arrest the frequency decline after a disturbance • Load Shedding Occurs; • Frequency decline was arrested; and, • Recovery was observed.

  7. UFLSRG Concepts to Remember • UFLS Plan is to protect against cascading resource loss • WECC RAS 1 is a separation Scheme – • COI and Four Corners • North Island • South Island

  8. UFLSRG • PRC-006-1 Broken down into these Requirements • Joint review including historical events - E.B.1 • Identified Island – E.B.2 • A Regional UFLS Plan & simulation - E.B.R3. through R5. Adopted by the WECC Board • A Regional UFLS Data Base – R6. thru R9. Established through PRC-006-WECC-CRT-1

  9. UFLSRG • Simulation of the Plan Once every 5 years - By November 1, 2014 (first year) – E.B.4 UFLSRG Identified Islands and Scenarios E.B.1 & E.B.2 based upon prior simulations and Southwest Outage 14 different scenarios

  10. UFLSRG • Simulation and Report Findings • WECC technical review and formatting – will be posted for review – approval at July meetings • Performance of the various UFLS settings demonstrated the applied relays will provide adequate protection for the resource losses totaling up to 25% or greater in the defined islands • Frequency excursion will experience conditions that would have 58.0Hz encroached but not passed • Studies illustrated that the frequency arrestment utilized the full 5-step load shed and resulted in acceptable trajectory for frequency recovery • In some cases, a few of the island configurations are showing 15-seconds anti-stalling features being engaged.

  11. UFLSRG • Islands Simulated • WECC • North Island (Canada, further separation Alberta) • South Island • SW Outage event and all combinations

  12. UFLSRG 2014 current WECC Plan 59.5 SILT ----- (~3,200 MW) 59.3 NW 5.6% 59.2 NW 5.6% 59.1 WECC other 5.3% 59.0 NW 5.6% 58.9 WECC other 5.9% 58.8 NW 5.6% 58.7 WECC other 6.3% 58.6 NW 5.6% 58.5 WECC other 6.7% 58.3 WECC other 6.7%

  13. Case-Islands

  14. MSSC Loss WECC 14,141 MW N-Island 6,647 MW S-Island 7,494 MW

  15. Project Loss WECC 33,344 MW N-Island 16,409 MW S-Island 16,935 MW

  16. UFLSRG • Performance • The WECC Plan performed as designed under simulations Load Shedding Occurs; Frequency decline was arrested; and, Recovery was observed.

  17. UFLSRG • SW Outage Events • Initial outage exceeded the 25% resources loss of the UFLS Plan, therefore not a credible island for UFLS – beyond standard requirements • Canada and Alberta • During the past 10 years these islands have not formed due to an underfrequency event.

  18. UFLSRG • Review of the last unplanned large loss of generation • June 14, 2004

  19. Disturbance Overview • June 14, 2004 at 0741 MST • Westwing 500 kV / 230 kV and Palo Verde 500 kV subs cleared • Generation Tripped - 4610 MW’s • Load Interrupted - 996 MW’s

  20. Event Summary • Bird Excrement Caused Fault on Westwing-Liberty 230 kV Line • Westwing WW1022 breaker failed to trip (single point of failure – Auxiliary Relay) • APS System Operators thought WW 1022 breaker was in the open position during restoration

  21. Frequency Chart

  22. Generation Tripped • Palo Verde Units 1, 2 & 3 3796 MW • Red Hawk Units 1 & 2 206 MW • Duke Arlington Unit 1 420 MW • Other Units 188 MW Total 4610 MW

  23. System Restoration • System Frequency recovered within 16 minutes • COI was over its OTC limit for 13.5 minutes • APS and SRP SOs focused on getting power to Palo Verde

  24. UFLSRG Future 2014-15 • Islands Simulated • E.B.1 & E.B.2 - Planning Coordinators shall participate and identify one or more islands to serve as the basis… • UFLSRG has reviewed the past 10 years and configuration of the Western Interconnection

  25. UFLSRG • Proposed Islands to be Simulated 2014-15 • WECC • North Island • South Island

  26. UFLSRG • UFLS Review Group leadership • To quote Forrest Gump “ I’m not a smart man” • Volunteered for one year in 2008 • Transferring leadership to Chris Pink

  27. Questions?

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