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WECC Planning Committee Underfrequency Load Shedding Review Group Update March 25, & 26, 2014.

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Presentation on theme: "WECC Planning Committee Underfrequency Load Shedding Review Group Update March 25, & 26, 2014."— Presentation transcript:

1 WECC Planning Committee Underfrequency Load Shedding Review Group Update March 25, & 26, 2014

2 2 Underfrequency Load Shedding Review Group (UFLSRG) Philip Augustin Richard Hydzik Jerry Rust Kent BoltonDanny Johnson Hari Singh Desmond ChanGerald Keenan Dede Subakti Eleanor EwryStephanie Lu Branden Sudduth Roy GearhartGrace Martinez Shilpa Toppo Irina GreenChris Pink Mike VanRemoortere Mark HansonSteve RueckertGregory Vassallo UFLSRG

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

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

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

6 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 7 o UFLS Plan is to protect against cascading resource loss o WECC RAS 1 is a separation Scheme –  COI and Four Corners  North Island  South Island UFLSRG Concepts to Remember

8 8 o PRC 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 UFLSRG

9 9  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 UFLSRG

10 10 o 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. UFLSRG

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

12 12 UFLSRG SILT (~3,200 MW) NW 5.6% NW 5.6% WECC other 5.3% NW 5.6% WECC other 5.9% NW 5.6% WECC other 6.3% NW 5.6% WECC other 6.7% WECC other 6.7% 2014 current WECC Plan

13 13 Case-Islands 14HS4 islandPgenPloadPSched10%15%20%25% WECC173,594167,475 Neutral 016,74725,12133,49541,869 NORTH76,65567,167 Export 6,44513,16216,52019,87823,237 SOUTH96,939100,307 Import -6,4453,5868,60113,61618,632 Feb 2014

14 14 MSSC Loss Area Area_Name unit Pmax 54ALBERTA Genesee ARIZONA Palo Verde B.C.HYDRO Revelstok345 1,505 11EL PASO Riogd_G IDAHO Brownlee IMPERIALCA El Steam LADWP Scatt3g MEXICO-CFE LRP-u MONTANA Colstrip NEVADA HigginS NEW MEXICO San Juan NORTHWEST CGS PAC J Bridger PG AND E Diablo Canyon PSCOLORADO Comanche SAN DIEGO Encina SIERRA Valmy G SOCALIF Ormond FORTISBC Waneta WAPA R.M. MBPP WAPA U.M. Ft Peck 108 WECC 14,141 MW N-Island 6,647 MW S-Island 7,494 MW

15 15 Project Loss Area Area_Name Project Loss Pmax 54ALBERTA Genesee 1,371 14ARIZONA Palo Verde 4,132 50B.C.HYDRO Gordon Shrum 2,830 11EL PASO Newman IDAHO Brownlee IMPERIALCA El Steam LADWP Inter Mtn 1,900 20MEXICO-CFE Pres. Juarez 1,128 62MONTANA Colstrip 2,306 18NEVADA Lenzie 1,170 10NEW MEXICO San Juan 1,834 40NORTHWEST Coulee 3ph 4,598 65PAC J Bridger 2,200 30PG AND E Diablo Canyon 2,400 70PSCOLORADO Comanche 1,530 22SAN DIEGO Encina SIERRA Valmy SOCALIF Ormond 1,500 52FORTISBC Waneta WAPA R.M. Craig 1,374 63WAPA U.M. Ft Peck 108 WECC 33,344 MW N-Island 16,409 MW S-Island 16,935 MW

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

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

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

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

20 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 21 Frequency Chart

22 22 Generation Tripped  Palo Verde Units 1, 2 & MW  Red Hawk Units 1 & MW  Duke Arlington Unit MW  Other Units 188 MW Total4610 MW

23 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 24 o Islands Simulated  E.B.1 & E.B.2 - Planning Coordinators shall participate and identify one or more islands to serve as the basis… o UFLSRG has reviewed the past 10 years and configuration of the Western Interconnection UFLSRG Future

25 25 o Proposed Islands to be Simulated  WECC  North Island  South Island UFLSRG

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

27 Questions?


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