1 / 27

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

helene
Download Presentation

WECC Planning Committee Underfrequency Load Shedding Review Group 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. 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?

More Related