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NERC Policy 9: Transmission Loading Relief

NERC Policy 9: Transmission Loading Relief. Greg Stone Duke Power A Duke Energy Company. NERC Policy 9: Transmission Loading Relief. Where did it come from? What is it? How does it work? Why does SERC get involved in so many?. NERC Policy 9: Transmission Loading Relief.

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NERC Policy 9: Transmission Loading Relief

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  1. NERC Policy 9:Transmission Loading Relief Greg Stone Duke Power A Duke Energy Company

  2. NERC Policy 9:Transmission Loading Relief • Where did it come from? • What is it? • How does it work? • Why does SERC get involved in so many?

  3. NERC Policy 9:Transmission Loading Relief • Where did it come from? • Advent of longer, more complicated transactions • The inclusion of new market players • Several “near misses” • Need to address ‘on-path’ and ‘off-path’ transactions equitably

  4. NERC Policy 9:Transmission Loading Relief • What is it? • An approach attempting to consider the impact of all Interchange Transactions in the Eastern Interconnection according to the level of transmission service acquired on each system • Used to reduce flows across a constrained facility, known as a flowgate, by curtailing Interchange Transactions

  5. NERC Policy 9:Transmission Loading Relief • Impact: How each transaction flows across a flowgate element. Power Transfer Distribution Factor (PTDF) A B 30 MW 100 MWA to C C D

  6. NERC Policy 9:Transmission Loading Relief • All Interchange Transactions: To be equitable, all transactions need to be considered: • IDC: Interchange Distribution Calculator • Database containing Interchange Transactions and PTDFs • List of flowgates • Can determine each transaction’s impact across a flowgate

  7. NERC Policy 9:Transmission Loading Relief • Consider a 50 MW transaction between A and B. If the PTDF for the highlighted line is 20%, what amount of flow will this transaction create on this facility? 50 MW Transaction from A to B PTDF = 20% 10 MW A B

  8. NERC Policy 9:Transmission Loading Relief • Transmission Service: Firmness • Non Firm Secondary, Hourly, Daily, Weekly, Monthly, Non Firm Network, Firm • Classifies each transaction according to its level of service (firmness) and allocates curtailments accordingly. Lowest priority transactions are impacted first, then moves on to higher priority transactions

  9. NERC Policy 9:Transmission Loading Relief • How is firmness determined? • Weakest link - Use lowest priority anywhere • Constrained Path Methodology • Use priority on the system with the constraint • Use weakest link for constraints off the path • Begins with all electronic tagging

  10. NERC Policy 9:Transmission Loading Relief • How does it work? • During transmission system evaluation, CA or SC discovers a flowgate with possible Operating Security Limit Violation (OSLV) • CA & SC determines and issues appropriate TLR Level via SCIS for the flowgate

  11. NERC Policy 9:Transmission Loading Relief • NERC TLR Levels: • Level 1 - Notify SCs of potential OSLV • Level 2 - Hold Interchange Transactions at current levels to prevent OSLV and Reallocate for higher priorities • Level 3 - Curtail Non-Firm Interchange Transactions

  12. NERC Policy 9:Transmission Loading Relief • NERC TLR Levels (cont.) • Level 4 - Reconfigure Transmission and Redispatch Generation • Level 5 - Curtail Firm Interchange Transactions • Level 6 - Implement Emergency Procedures • Level 0 - TLR Concluded

  13. NERC Policy 9:Transmission Loading Relief • Curtailments: • If curtailments are necessary, SC queries the IDC for contributing schedules (PTDF5%) • Curtailments ordered by priority of transmission service • SC directs curtailments

  14. NERC Policy 9:Transmission Loading Relief • Reconfiguration and Redispatch: • Reconfiguration of Transmission elements to relieve the OSLV • Changing MW output of generators to relieve OSLV • Both options may have limited availability

  15. NERC Policy 9:Transmission Loading Relief • Why does SERC get involved in so many TLRs?

  16. NERC Policy 9:Transmission Loading Relief 6% CE OH NY PJM AEP APS VP TVA Duke CP&L EES SCPSA SOCO SCEG

  17. NERC Policy 9:Transmission Loading Relief CE OH NY PJM AEP APS 11% VP TVA Duke CP&L EES SCPSA SOCO SCEG

  18. NERC Policy 9:Transmission Loading Relief CE OH NY 5% PJM AEP APS VP TVA Duke CP&L EES SCPSA SOCO SCEG

  19. NERC Policy 9:Transmission Loading Relief CE OH NY PJM AEP APS 12% 22% VP 16% TVA Duke CP&L 6% EES SCPSA 9% SOCO SCEG 8%

  20. NERC Policy 9:Transmission Loading Relief • To find out more: • Visit the NERC web site: WWW.NERC.COM • Fast Links: TDF Viewers • On-Line Viewer

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