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

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 Fault/Separation • Lessons Learned 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

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 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

4 Path Overview 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

5 Impacted Paths - Bubble Map Path 3 Path 83 MATL Ingledow - ING Nelway - NLY (AESO) (BCHA) (BCHA) Montana Alberta Tie - MATL 2L277/71L 2L112 5L51 5L52 AESO NWMT BCHA BPA Haylake Rimrock (NWMT) (WWA) Boundary - Custer - CUS BDY (BPA) (BPA) 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

6 Existing Conditions Path 3 • 5L51 was out of service – Maintenance scheduled between Oct Ingledow - ING Nelway - NLY (BCHA) (BCHA) 16-27, 2017 • Path Flows 2L277/71L 2L112 5L51 5L52 – 10/16 flow was ~1,400 MW from BCHA to BPA BCHA – 10/26 flow was ~530 MW from BCHA to BPA BPA Boundary - Custer - CUS BDY (BPA) (BPA) 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

7 Existing Conditions Path 83 • In-service MATL • Path flows (AESO) – 10/16 flow was ~120 MW into Montana Alberta Tie - MATL AESO AESO – 10/26 flow was ~145 MW into NWMT NWMT Haylake Rimrock (NWMT) (WWA) 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

8 The Fault Path 3 Fault Occurred on 5L52 • 10/16/2017, 1545 PDT – 10/26/2017, 0817 PDT – Ingledow - ING Nelway - NLY (BCHA) (BCHA) Both events were single pole to ground faults • 2L277/71L Cause likely due to insulator contamination • 2L112 5L51 5L52 Triggered RAS and trips 2L112 • BCHA BPA Path 3 now open • Boundary - Custer - CUS BDY (BPA) (BPA) 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

9 The Fault (cont.) Path 83 • MATL RAS Action MATL – Path 83 open (AESO) Montana Alberta Tie - MATL • Western Interconnection AESO separated into Northern and NWMT Southern islands Haylake Rimrock (NWMT) (WWA) 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

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 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

11 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 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

12 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 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

13 Lessons Learned: Suppressed Response 10/ 16/ 2017 10/ 26/ 2017 1000 1000 500 500 0 0 ACE (MW) ACE (MW) -500 -500 -1000 -1000 -1500 -1500 16:38 16:43 16:48 16:53 16:58 17:03 17:08 09:12 09:17 09:22 09:27 09:32 09:37 09:42 Time (MST) Time (MST) Southern Northern WI ACE Island ACE Island ACE 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

14 Lessons Learned: Additional Tools 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