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Integration of Variable Generation into the Grid: Need for TVLs (Transfer Variability Limits) Gordon Dobson-Mack (Chair) Dynamic Transfer Capability Task Force Wind Integration Forum – Steering Committee November 17 2011. BCCPG. Purpose of Presentation.

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  1. Integration of Variable Generation into the Grid: Need for TVLs (Transfer Variability Limits)Gordon Dobson-Mack (Chair)Dynamic Transfer Capability Task ForceWind Integration Forum – Steering CommitteeNovember 17 2011 BCCPG

  2. Purpose of Presentation • Discuss the need for TVLs and what can be done to increase them

  3. Outline • Variability & its impacts: • Increased variability is a reality for operations; • Dynamic Transfers contribute to variability; • Transfer Variability impacts the grid; • Need Transfers Variability Limits for some systems. • DTC Task Force • Mandate & Membership; • Deliverables; • What Next? • Questions & Options;

  4. BPA’s Installed Wind Source: BPA: http://transmission.bpa.gov/business/operations/Wind/WIND_InstalledCapacity_Plot.pdf

  5. NWPP Wind Generation Levels 2010 Coincident Peak Load = 60,200 MW Dec 2010 Installed Wind Gen = 7,800 MW Dec 2012 Installed+Committed Wind Gen = 13,200 MW 2010 Spring Min Load (HE04) = 32,745 MW Source: NWPP & DTC TF: http://www.columbiagrid.org/documents-search.cfm search “DTCTFPhaseFullReport031611.pdf”

  6. Source: http://www.westgov.org/EIMcr/meetings/07MAR11/present/panel5/l_beane.pdf see slide #3

  7. Generation or Transmission Problem? • Generation Problem: • Need to maintain Generation Balance; • Want access to least cost & most flexible Ancillary Services • Transmission Problem…As well: • Transmission system designed historically for routine predictable changes; • Must be ready to withstand the next worst contingency; • Voltage control and RAS arming are local measures that must be factored into the solution.

  8. R L R L R L R L C C C C C Transmission Line Physics Load Transmission Line

  9. Reactive “Tuning” And Remedial Action Schemes (RAS) Light Load or line open - High Voltage unless reactive switched off Maximum TTC, Transmission Tuned Low Voltage: Without added Reactive – could Be a voltage collapse

  10. Power - Voltage Curves andReliability N-1 Limits Operating MW Range Caps in Capacitor Switched on Acceptable Voltage Range Operating MW Range no Caps in N-1 Outage Voltage Level N-1 Outage Normal N-0 Reliability Limits MW Power Level

  11. Added Switching Traditional tie line flow 2050 MW Path flow with VG Remedial Action Schemes (RAS) RAS arm RAS un-arm Capacitor In Capacitor Out MW Flow 1850 MW 0 10 20 30 40 50 60 Minutes

  12. DTC Studies-BPA Report (Feb 2010) • Present Dynamic Schedule Requirements • Montana – NW • 50 MW BPA Loads • 20 MW Glacier Wind • 1318 MW Colstrip Participants • 91 MW NWE • Idaho – NW • 200 MW PAC • 60 MW Boardman 14

  13. DTC Task Force – Part of Wind Integration Study Team (WIST) DTC Task Force Convened October 2010 Technical Staff primarily from NW & CA entities ~55 Meetings to date. Purpose: Develop a technical consensus on how to facilitate increased Dynamic Transfers without compromising system reliability BAs & TPs to establish DTC Limits on paths Determine if & how to expand DTC

  14. DTC TF (Phase 3 )Membership Avista: Rich Hydzik BPA: Brian Tuck, RamuRamanathan BCH: Steven Pai, Sanjeet Sanghera, CAISO: Jim Price Gaelectric: Dan Wheeler IPCO: Orlando Ciniglio MSR: Dave Arthur, Ann Fisher NWE: Rikin Shah, Ray Brush PAC: SanmanRokade PGE: Philip Augustin, Don Johnson PSE: Alex Berres, Joe Seabrook TANC: Abbas Abed, Shawn Matchim SMUD: Richard Buckingham WAPA (Folsum): Kirk Sornborger • Powerex: Gordon Dobson-Mack • DTC TF Chair • Tel: 604-891-6004 • Gordon.Dobson-Mack@powerex.com • Columbia Grid: Marv Landauer • Northern Tier: Rich Bayless • NWPP: Don Badley 3

  15. DTC TF Work Process Phase 1 (03/11) Phase 2 (07/11) Phase 3 (11/11)

  16. Three Conditions Restricting Transfer Variability Limits

  17. Caveats for Phase 3 Report • Does not calculate TVLs for particular Paths; • Recommends a methodology; • Leaves limit calculations to Transmission Providers • Does not recommend specific projects • Describes generic projects to enhance TVLs • Leaves specific project recommendations to TPs

  18. Bottom Line – so far • TVL is a real issue; • Impediment to transfer imbalance energy and regulation between BAs; • Will limit where & how the region can integrate wind; • Limits can be raised, but not overnight. • Need for TVLs will vary by system; • Should plan for increased transmission flexibility to manage the increasingly variable flows on grid

  19. Questions for Companies • How automated is your RAS arming? • How much automatic voltage control do you have across your system? • What are the TVLs for your major flowgates? • How will your company manage TVLs? • What capital projects are planned to increase Transmission Flexibility?

  20. Options for increasing TVLs • Modifying some SOL assumptions (e.g. overshedding); • Automating RAS • Automating voltage control • Ensure voltage control equipment is designed for frequent switching (**Detailed TVL studies needed to identify most effective solutions)

  21. Questions?

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