Canada/US Separation Event Tim Reynolds W E C C E S T E R - - PowerPoint PPT Presentation

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Canada/US Separation Event Tim Reynolds W E C C E S T E R - - PowerPoint PPT Presentation

Dec 21, 2023 132 likes •296 views

Canada/US Separation Event Tim Reynolds W E C C E S T E R N L E C T R I C I T Y O O R D I N A T I N G O U N C I L 2 Presentation Outline Event Overview Existing Conditions Effects of the

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Canada/US Separation Event

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Tim Reynolds

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Presentation Outline

  • Event Overview
  • Existing Conditions
  • Effects of the Fault/Separation
  • Lessons Learned

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SLIDE 3

Event Overview

  • The Western Interconnection separated

between Canada and the US on 10/16/2017 and 10/26/2017

  • Last occurrence around 20 years ago

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SLIDE 4

Path Overview

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SLIDE 5

Impacted Paths - Bubble Map

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Path 3 Path 83

5L51 5L52 2L277/71L 2L112

BPA BCHA Boundary - BDY (BPA) Nelway - NLY (BCHA) Custer - CUS (BPA) Ingledow - ING (BCHA)

Haylake (NWMT) MATL (AESO) Rimrock (WWA)

Montana Alberta Tie - MATL

NWMT AESO

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SLIDE 6

Existing Conditions

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Path 3

5L51 5L52 2L277/71L 2L112

BPA BCHA Boundary - BDY (BPA) Nelway - NLY (BCHA) Custer - CUS (BPA) Ingledow - ING (BCHA)

  • 5L51 was out of service

– Maintenance scheduled between Oct 16-27, 2017

  • Path Flows

– 10/16 flow was ~1,400 MW from BCHA to BPA – 10/26 flow was ~530 MW from BCHA to BPA

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SLIDE 7

Existing Conditions

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Path 83

Haylake (NWMT) MATL (AESO) Rimrock (WWA)

Montana Alberta Tie - MATL

NWMT AESO

  • In-service
  • Path flows

– 10/16 flow was ~120 MW into AESO – 10/26 flow was ~145 MW into NWMT

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SLIDE 8

5L51 5L52 2L277/71L 2L112

BPA BCHA Boundary - BDY (BPA) Nelway - NLY (BCHA) Custer - CUS (BPA) Ingledow - ING (BCHA)

The Fault

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Path 3

  • Fault Occurred on 5L52

– 10/16/2017, 1545 PDT – 10/26/2017, 0817 PDT

  • Both events were single pole to ground faults
  • Cause likely due to insulator contamination
  • Triggered RAS and trips 2L112
  • Path 3 now open
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The Fault (cont.)

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  • MATL RAS Action

– Path 83 open

  • Western Interconnection

separated into Northern and Southern islands

Path 83

Haylake (NWMT) MATL (AESO) Rimrock (WWA)

Montana Alberta Tie - MATL

NWMT AESO

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SLIDE 10

After the Fault (10/16)

  • Frequency Deviation (10/16)

– Northern Island 60.32 Hz – Southern Island 59.84 Hz

  • 1552 PT

– Still inadequate generation in southern island. – Peak RC sends RMT stating for all entities to bring generation up as necessary and align schedules to stabilize system frequency.

  • 1610 PT

– Ingeldow-Custer (5L52) put in-service – BCHA re-synced with BPA – Path 83 then restored

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After the Fault (10/26)

  • Frequency Deviation (10/26)

– Northern Island 60.30 Hz – Southern Island 59.90 Hz

  • 0841 PT

– Ingeldow-Custer (5L52) put in- service – BCHA re-synced with BPA – Path 83 then restored

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Lessons Learned

  • Suppressed Frequency Response

– Better coordination/procedures

  • Additional tools/alarms to help operators

recognize islanding

  • Adding single pole tripping
  • Scenario is being added to future training

schedules

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Lessons Learned: Suppressed Response

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  • 1500
  • 1000
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500 1000 16:38 16:43 16:48 16:53 16:58 17:03 17:08 ACE (MW) Time (MST)

10/ 16/ 2017

WI ACE Northern Island ACE Southern Island ACE

  • 1500
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500 1000 09:12 09:17 09:22 09:27 09:32 09:37 09:42 ACE (MW) Time (MST)

10/ 26/ 2017

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Lessons Learned: Additional Tools

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