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ISTEP Update

Transmission Planning Summit August 11, 2009 Crown Plaza Hotel New Orleans, LA. ISTEP Update. ISTEP 2009 Projects. ISTEP 2009. South Central Arkansas/Northeast Louisiana constraint – to address North to South flows Central Arkansas constraint – to address South to North flows

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ISTEP Update

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  1. Transmission Planning Summit August 11, 2009 Crown Plaza Hotel New Orleans, LA ISTEP Update

  2. ISTEP 2009 Projects

  3. ISTEP 2009 • South Central Arkansas/Northeast Louisiana constraint – to address North to South flows • Central Arkansas constraint – to address South to North flows • Lake Charles 230 kV Loop (relieve 138 kV Flowgate NELLC_NELLCB) • Baton Rouge/South MS constraint – to address Central to South flows • Jackson Area Today’s presentation focuses on preliminary results for projects 1 and 2

  4. ISTEP Projects 1 & 2 – ISSUES

  5. Project 1 & 2 Issues2008 Monitored Flowgate Curtailments

  6. Project 1 & 2 Issues2008 Monitored Flowgates - Locations 4 1 5 3 2

  7. Projects 1 & 2Method of Preliminary Study • Replicate the flowgate issues that have occurred in 2008 and determine solutions to mitigate them • Issue not apparent in long-term models • Determine system operation during a known TLR event • Model the system as shown during the event using a day-ahead operational model • Should replicate the flowgate overload issues • Determine system changes to eliminate flowgate issues

  8. Project 1 South Central AR / Northeast LA Constraint

  9. Project 1:Southcentral AR / Northeast LA ConstraintBackground • North – South generation bias observed • Affected Flowgates • Sheridan – Eldorado FTLO Etta – McNeil (Flowgate 2) • WhiteBluff-Sheridan FTLO Mabelvale-Sheridan (Flowgate 3) • Mabelvale-Sheridan FTLO White Bluff-Sheridan (Flowgate 4) • Flowgate issues occur during daily off-peak periods of the peak loading season

  10. Project 1:South Central AR / Northeast LA ConstraintModeling and Assumptions • Used July 6, 2008 Operational day-ahead model • TLR curtailment called July 6, 2008 @ 2am • WhiteBluff-Sheridan FTLO Mabelvale-Sheridan (Flowgate 3) • Actual Generation / Load / Transactions used in the model simulation

  11. South Central AR / Northeast LA Constraint Base Flows Base flows for 500kV are North to South

  12. South Central AR / Northeast LA Constraint SHRMAB_KEO (Flowgate 1)

  13. Southcentral AR / Northeast LA Constraint SHRELD_HSPET (Flowgate 2)

  14. South Central AR / Northeast LA Constraint WHBSHE_MABEL (FG3), WBKEO_SHMAB (FG5)

  15. South Central AR / Northeast LA Constraint MABSH_WBSH (Flowgate 4)

  16. Southcentral AR / Northeast LA Constraint Upgrades in the Change Case • Terminal Limiting Equipment Upgrades: • Sheridan-Eldorado 500kV from 1732 to 2546 MVA (FG2) • White Bluff – Sheridan 500 kV from 1732 to 2546 MVA (FG3) • Mabelvale – Sheridan500 kV from 1732 to 2546 MVA (FG4)

  17. South Central AR / Northeast LA Constraint Change Case Base Flows

  18. South Central AR / Northeast LA Constraint Change CaseSHRMAB_KEO (Flowgate 1)

  19. Southcentral AR / Northeast LA ConstraintChange CaseSHRELD_HSPET (Flowgate 2)

  20. South Central AR / Northeast LA Constraint Change CaseWHBSHE_MABEL (FG3), WBKEO_SHMAB (FG5)

  21. South Central AR / Northeast LA ConstraintChange Case MABSH_WBSH (Flowgate 4)

  22. Project 2Central Arkansas Constraint

  23. Project 2. Central AR ConstraintBackground • Generation Outlet Issue • South to North Flows Observed • Affected Flowgates • Sheridan – Mabelvale FTLO White Bluff – Keo (FG1) • Flowgate issue occurs during daily on-peak periods of off-peak load season 4

  24. Project 2. Central AR ConstraintModeling and Assumptions • Used Dec 21, 2008 Operational day-ahead model • TLR curtailment called Dec 21, 2008 @ 6pm • Sheridan – Mabelvale FTLO White Bluff – Keo (Flowgate 1) • Actual Generation / Load / Transactions used in the model simulation

  25. Central AR ConstraintBase Flows Base flows for 500kV are South to North

  26. Central AR ConstraintSHRMAB_WBKEO (Flowgate 1)

  27. Central AR ConstraintSHRELD_HSPET (Flowgate 2)

  28. Central AR ConstraintWHBSHE_MABEL (FG3), WBKEO_SHMAB (FG5)

  29. Central AR ConstraintMABSH_WBSH (Flowgate 4)

  30. Central AR Constraint Upgrades in the Change Case • Terminal Limiting Equipment Upgrades: • Mabelvale – Sheridan 500 kV from 1732 to 2546 MVA (FG1)

  31. Central AR ConstraintChange Case Base Flows

  32. Central AR ConstraintChange CaseSHRMAB_WBKEO (Flowgate 1)

  33. Central Ar ConstraintChange CaseSHRELD_HSPET(Flowgate 2)

  34. Central AR ConstraintChange CaseWHBSHE_MABEL (FG3), WBKEO_SHMAB (FG5)

  35. Central Ar ConstraintChange CaseMABSH_WBSH (Flowgate 4)

  36. Results Summary

  37. Results Summary: ISTEP solution 38

  38. Preliminary Cost EstimateLimiting Element Listing Project 1: Southcentral AR / Northeast LA Constraint * costs for upgrades to substation bus, and/or breaker relaying, and/or line relaying are not included in the above estimates. If required, additional costs will apply. 39

  39. Preliminary Cost EstimateLimiting Element Listing Project 2: Central Arkansas Constraint * costs for upgrades to substation bus, and/or breaker relaying, and/or line relaying are not included in the above estimates. If required, additional costs will apply. 40

  40. Next Steps

  41. Next Steps • Further Analysis for Projects 1 and 2 • Begin Work on Projects 3, 4, and 5 • Status Report at October LTTIWG Meeting

  42. Questions? Douglas Bowman, PE, PMP Lead Engineer, ICT Planning 501-688-1640 dbowman@spp.org

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