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Flowgate Selection for Economic Simulations

Learn about the impact and criteria for selecting flowgates in economic simulations. Manage economic dispatch and ensure a reasonable economic solution. Get insights from flowgate simulation data and understand the effect of adding flowgates. Next steps for flowgate selection.

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Flowgate Selection for Economic Simulations

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  1. ITP20 Flowgate Selection Introduction Timothy Miller July 21st, 2010 TWG Teleconference

  2. Flowgate Simulation Impact • In the economic simulations flowgates are the only flow control mechanism • Line limits are not heeded by default • Penalties associated with an overload provide control • Manage the economic dispatch • Key to a reasonable economic solution

  3. Selecting Reasonable Flowgates • Staff is developing flowgates based upon the ITP 20 Year Assessment Scope document • Preferred outcomes • Spreadsheet listing the flowgates • Charts summarizing the simulated data • Maps showing congestion

  4. Flowgate Selection Criteria

  5. Flowgate Selection Criteria • Starting Point • NERC Book of Flowgates • Additional criteria • 345 kV Contingencies • 115+ kV Monitored Elements • Evaluate 8,760 hours

  6. Flowgate Selection Criteria • Additional criteria • SPP devices and tie-lines • 60 hour threshold • Rate A & Rate B unchanged • Three iterations

  7. Unique Operational Flowgates

  8. Unique Operational Flowgates • SPP-SPS interfaces • Staff recommends redefining flowgate as individual OTDF flowgates due to extensive upgrades in place by 2030.

  9. Unique Operational Flowgates • GGS Stability Interface • Staff recommends continued use of this interface

  10. Example Flowgate Simulation Data

  11. Flowgate Example Results • Violations avoided by flowgate definition • Before & After • By Area • By month

  12. Effect of Adding Flowgates

  13. Flowgate Example Results • Flowgate congestion • Limit is respected • Prices change

  14. Congestion by Shadow Price Impact

  15. Next Steps • Staff to provide TWG draft results: • Top 10 congested flowgate summary • Exhaustive flowgate spreadsheet • Hours Congested & Avg. Shadow Price • Results of contingency scans • Requesting TWG endorsement of flowgates in August teleconference

  16. Timothy MillerPlanning Engineer 501-614-3357tmiller@spp.org

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