1 / 14

Reactive Margin Studies

Reactive Margin Studies. TSS Meeting # 156 – January 19-21, 2011 Rikin Shah, Engineer – Transmission Planning. NWE System Overview. System Statistics NorthWestern Energy operates in Montana, South Dakota and Nebraska. 610,000 Total Customers Peak Load Summer 1610 Winter 1766.

erma
Download Presentation

Reactive Margin Studies

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. Reactive Margin Studies TSS Meeting # 156 – January 19-21, 2011 Rikin Shah, Engineer – Transmission Planning

  2. NWE System Overview • System Statistics • NorthWestern Energy operates in Montana, South Dakota and Nebraska. • 610,000 Total Customers • Peak Load • Summer 1610 • Winter 1766

  3. NWE MT System Oneline

  4. NWE System Generation Resources

  5. No Synchronous condensors or DVAR’s currently present in NWE system. NWE Reactive Capability

  6. NWE External Paths and Limitations • NWE has three different external paths • Path 8 : Montana to Northwest • East to West Limint = 2200 MW • Limited by the pre-event voltage performance for the limiting outage of both Broadview – Garrison 500 kV line. • West to East limit = 1350 MW • Limited by voltage performance at Hamilton but now limited by thermal rating due to shut down of the paper mill. • Path 18 : Montana – Idaho • North – South Limit = 337 MW • Limited by voltage performance at Peterson Flats, Dillon Salmon. This voltage criterion is waived then the regular voltage criteria and is agreed by the owners of the path. Limited due to double outage of Bridger – 3 Mile Knoll and Bridger-Kinport 345 kV lines. • South – North = 256 MW • Limited due to the outage of Brady-Antelope 230 kV line.

  7. NWE External Paths and Limitations • NWE has three different external paths • Path 80: Montana to Southeast • South to North: 600 MW • Limit based on the post transient voltage performance for the double Broadview – Garrison events. • North to South : 600 MW • Limited due to thermal overload on Yellowtail South nomogram

  8. CS–BV, BV-GR Double Outages • The Acceleration Trend Relay (ATR) RAS scheme trips the Colstrip Generation based on the acceleration felt by Colstrip units due to the 500 kV outages. • Normally the ATR would trip 3 Colstrip Units (1900 MW) for the double CS-BV or BV-GR outages. ATR would trip at least 2 units (1150 MW) for this events. • Due to the Unit tripping the 500 kV lines are very lightly loaded and the voltage is raised due to this tripping.

  9. PV Analysis for the Broadview 500 kV Bus • Broadview is the critical bus for the 500 kV outages. The plot below shows the Voltage for the Broadview Bus at different flow levels under N-0 conditions.

  10. PV Analysis for the Broadview 500 kV Bus • The plot below shows the Voltage for the Broadview Bus at different flow levels under N-1 conditions ( Colstrip – Broadview 500 kV line out)

  11. PV Analysis for the Broadview 500 kV Bus • The plot below shows the Voltage for the Broadview Bus at different flow levels under N-1 conditions (Broadview – Garrison 500 kV line out)

  12. PV Analysis for the Broadview 500 kV Bus • The plot below shows the Voltage for the Broadview Bus at different flow levels under N-1 conditions (Broadview – Garrison 500 kV line out)

  13. PV Analysis for the BV-GR Double

  14. PV Analysis for the GR-TT Double

More Related