Kent Bolton & Hari Singh UFLSRG Charter - - PowerPoint PPT Presentation

Under-Frequency Load Shedding Review Group Meeting (UFLSRG)

October 2, 2019

Kent Bolton & Hari Singh

Purpose: To biennially review the WECC Off- Nominal Frequency Load Shedding Plan (Plan) to help WECC Members meet their compliance

• bligation to evaluate the Plan’s consistency with

NERC Reliability Standard PRC-006.

▪ Conduct biennial simulations of the Plan to assess consistency… report the findings of simulations. ▪ Review the submitted UFLS data for consistency and accuracy of modeling.

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UFLSRG Charter – Purpose/Responsibilities

▪ Created in 2012-13 by JGC to help meet compliance with PRC-006-2 (approved by FERC in 2012) – WECC Variance ▪ WECC UFLS Criterion created as supplement ▪ First UFLS Assessment Report in 2013 ▪ Subsequent Reports in 2015/16 & 2017/18 ▪ 2019/20 Assessment – UFLS simulations will be performed by WECC Staff for first time

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UFLSRG – History

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WECC Island – Imbalance

Imbalance =

(Load – Actual Generation) / Load Equivalent “Old” Imbalance

Generation Trip MW (Target / Actual)

2019 Heavy Summer 2019 Light Spring

10% ~13% 23228 / 24187 (10.6%) 12850 / 13326 (10.5%) 20% ~23% 40512 / 41962 (20.8%) 22358 / 22666 (20.3%) 25% ~28% 49153 / 49367 (25.1%) 27112 / 27613 (25.5%)

Actual Generation = Total Generation – Tripped Generation

UFLS Design Performance (PRC-006 Attachment 1)

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Frequency shall remain above/below the Under/Over-frequency Performance Characteristic curve in PRC-006-3 - Attachment 1, either for 60 seconds or until a steady-state condition between 59.3 Hz and 60.7 Hz is reached

UFLS Performance Monitored Buses

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Canada MT/ID/WY WA/OR CO/UT/NV Williston 500 kV Nicola 500 kV Langdon 240 kV Kelly Lake 230 kV Clover Bar 230 kV Muskeg River 69 kV Garrison 500 kV Midpoint 500 kV Bridger 345 kV Wyodak 230 kV Crossover 230 kV DRAM 138 kV Coulee 500 kV John Day 500 kV Bethel 230 kV Boundary 115 kV Talbot Hill 115 kV Port Angeles 69 kV Valmy 345 kV Terminal 345 kV Daniels Park 230 kV Sigurd 230 kV Hayden 230 kV North 115 kV

• N. California
• S. California/Mexico
• S. California/NV

AZ/NM Red Mountn 500 kV Midway 500 kV Gregg 230 kV Folsom 230 kV Newark 115 kV Rector 66 kV Vincent 500 kV

• Imp. Valley 500 kV

Sylmar 230 kV Rosita 230 kV Mesa Rim 69 kV San Onofre 12.47 kV

Harry Allen 500 kV McCullough 500 kV Victorville 500 kV Decatur 230 kV El Segundo 230 kV Millers 57.5 kV

Moenkopi 500 kV Rio Puerco 345 kV Gladstone 230 kV Phoenix 230 kV Alomogordo 115 kV Tucson 47.2 kV

10% 2019 LSP Simulation Results

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10% 2019 LSP Simulation Results

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25% 2019 LSP Simulation Results

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25% 2019 LSP Simulation Results

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10% 2019 HS Simulation Results

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10% 2019 HS Simulation Results

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25% 2019 HS Simulation Results

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25% 2019 HS Simulation Results

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North & South Islands – Imbalance

Actual Generation = Total Generation – Tripped Generation

Imbalance =

(Load – Actual Generation) / Load

Equivalent “Old” Imbalance

Generation Trip MW (Target / Actual) 2019 Heavy Summer North Island South Island

10% ~13% 10196 / 12828 (13.5%) 11612 / 11911 (10.3%) 20% ~23% 17760 / 17817 (20.1%) 20868 / 21150 (20.3%) 25% ~28% 21542 / 21615 (25.1%) 25497 / 25668 (25.2%)

UFLS Performance Monitored Buses

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Canada MT/ID/WY WA/OR CO/UT/NV Williston 500 kV Nicola 500 kV Langdon 240 kV Kelly Lake 230 kV Clover Bar 230 kV Muskeg River 69 kV Garrison 500 kV Midpoint 500 kV Bridger 345 kV Wyodak 230 kV Crossover 230 kV DRAM 138 kV Coulee 500 kV John Day 500 kV Bethel 230 kV Boundary 115 kV Talbot Hill 115 kV Port Angeles 69 kV Valmy 345 kV Terminal 345 kV Daniels Park 230 kV Sigurd 230 kV Hayden 230 kV North 115 kV

• N. California
• S. California/Mexico
• S. California/NV

AZ/NM Red Mountn 500 kV Midway 500 kV Gregg 230 kV Folsom 230 kV Newark 115 kV Rector 66 kV Vincent 500 kV

• Imp. Valley 500 kV

Sylmar 230 kV Rosita 230 kV Mesa Rim 69 kV San Onofre 12.47 kV Harry Allen 500 kV McCullough 500 kV Victorville 500 kV Decatur 230 kV El Segundo 230 kV Millers 57.5 kV Moenkopi 500 kV Rio Puerco 345 kV Gladstone 230 kV Phoenix 230 kV Alomogordo 115 kV Tucson 47.2 kV

North Island - 2019 HS - 10% Imbalance

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North Island - 2019 HS - 20% Imbalance

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North Island - 2019 HS - 25% Imbalance

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South Island - 2019 HS - 10% Imbalance

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South Island - 2019 HS - 20% Imbalance

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▪ 2019LSP: Run 10%, 20% and 25% Imbalance Simulations for North & South Islands ▪ All Simulations: Determine V/Hz performance violations using vfmgen model ▪ Sensitivity to DER penetration level

• South & North Islands – 2019HS? 2019LSP? Both?
• DER level assumption in each control area?
• Spread uniformly across All loads in control area?

Or only across loads tagged for UFLS?

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Next Steps

▪ 2018 June-July: UFLS Data Submission by GO’s and UFLS Entities to WECC ▪ 2018 Aug-Dec: Review/Verify UFLS Data for Consistency and Accuracy; Resolve Issues with entities → Validated UFLS Data in MDF ▪ 2019 Jan-Apr: Build study cases using 2019 Light Spring & 2019 Heavy Summer operating base cases (with updated MDF) ▪ 2019 Apr-Oct June: Perform UFLS Simulations ▪ 2019 Nov July-Oct: Review Results + Draft Report ▪ 2019 Dec Nov: UFLSRG Approval; followed by StS approval (Jan-2020) and RAC+OC approval (Feb-2020)

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UFLSRG 2018-19 Study Cycle

Contact:

Hari Singh, Xcel Energy Hari.singh@xcelenergy.com Kent Bolton, WECC kbolton@wecc.org

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