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Redispatch Credit

Redispatch Credit. NERC/NAESB TLR Task Force Feb 2-3, 2005 Houston, Texas Operations Reliability Subcommittee Feb 8-9, 2005 Scottsdale, AZ. Background. PJM implemented the joint PJM/MISO Congestion Management Process (CMP) in May 2004; MISO will implement March 1 2005

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Redispatch Credit

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  1. Redispatch Credit NERC/NAESB TLR Task Force Feb 2-3, 2005 Houston, Texas Operations Reliability Subcommittee Feb 8-9, 2005 Scottsdale, AZ 1

  2. Background • PJM implemented the joint PJM/MISO Congestion Management Process (CMP) in May 2004; MISO will implement March 1 2005 • Due to limitations in the current process, it is difficult to acknowledge relief provided by redispatch in all situations • PJM and MISO built their systems to address this limitation; however, the NERC community felt it appropriate to further investigate the issue to ensure both reliability and equitable treatment 2

  3. What the IDC Sees F R ED2 ED6 7FN MF 100MW FORWARD 60MW Firm-7 35MW ED-6 15MW ED-2 0MW REVERSE 45MW Firm-7 15MW ED-6 10MW ED-2 -100MW 110MW Forward, 70MW Reverse 3

  4. How Actual Flows Behave F R ED2 ED6 7FN MF 100MW NET 40MW Actual Flow 0MW COUNTERFLOW Neutralizes 70MW of Flow -100MW 110MW F - 70MW R = 40MW Net 4

  5. How This Can Create a Problem F R ED2 ED6 7FN MF IDC Reported Flow Actual Flows 100MW Flowgate Limit is 40MW RTO wants to Reduce Flows by 20MW Limit Target 0MW -100MW 5

  6. How This Can Create a Problem F R ED2 ED6 7FN MF IDC Reported Flow Actual Flows 100MW RTO Provides 20MW Counterflow Resultant Decrease of 20MW Limit Target 0MW -100MW 20MW CF Increase 6

  7. How This Can Create a Problem F R ED2 ED6 7FN MF IDC Reported Flow Actual Flows 100MW RTO Provides 20MW Counterflow Actual Flows Change, but Forward IDC Flows do Not Change Resultant Decrease of 20MW Limit Target 0MW -100MW 20MW CF Increase 7

  8. How the IDC Handles this Today F R ED2 ED6 7FN MF 20MW Relief = 20MW Reduction IDC Reported Flow Actual Flows 100MW When TLR is called, the IDC monitors the RTO’s net flow change from the time the TLR begins to see if relief has been provided, and applies it to the forward flow 20MW Change = 20MW Relief Limit Target 0MW -100MW 8

  9. Where the Problem Still Lies F R ED2 ED6 7FN MF 20MW Change = No Change in Forward Flow IDC Reported Flow If PJM or MISO redispatch BEFORE calling a TLR, the IDC doesn’t see any relief, and will determine their relief obligation using the full forward flow Actual Flows 100MW Limit Target 0MW -100MW 9

  10. Troubles and Consequences • Equity Concerns • “Double Charging” PJM Market Participants for redispatch • CA’s are allowed credit for proactive redispatch in TLR; RTO’s are not • Reliability Concerns • Inaccurate data leads to inaccurate relief requests 10

  11. Ensuring Equity and Enhancing Reliability • With the specification of standard rules, equitable treatment can be assured • PJM and MISO can perform network service redispatch in TLR 3 and 5 per the CMP; other Control Areas are only exposed to redispatch requirements in TLR5 • Standard treatment of proactive actions will ensure reasonable allocation of relief responsibility • Reliability will be enhanced • The IDC will have more accurate data; no “ghost megawatts” will be counted 11

  12. Redispatch in Practice F R ED2 ED6 7FN MF IDC Reported Flow • 8:00 AM - RTO determines flowgate is becoming constrained. “Snapshot” of flows is taken. • 250 in the forward direction • 190 in the reverse direction. Actual Flows 300MW 0MW -300MW 12

  13. Redispatch in Practice F R ED2 ED6 7FN MF IDC Reported Flow • 8:00 AM - RTO determines flowgate is becoming constrained. “Snapshot” of flows is taken. • 250 in the forward direction • 190 in the reverse direction • RTO mitigates constraint by increasing counterflow Actual Flows 300MW 0MW -300MW 13

  14. Redispatch in Practice F R ED2 ED6 7FN MF IDC Reported Flow • 10:00 AM – RTO determines flowgate must go into TLR. Current flows are: • 290 in the forward direction • 265 in the reverse direction Actual Flows 300MW 0MW -300MW 14

  15. Redispatch in Practice F R ED2 ED6 7FN MF IDC Reported Flow • 10:00 AM – RTO determines flowgate must go into TLR. Current flows are: • 290 in the forward direction • 265 in the reverse direction • Comparing Snapshot with Current shows 35MW relief provided between time of initial constraint control and TLR issuance Actual Flows 300MW Snapshot 0MW -300MW 15

  16. Redispatch in Practice F R ED2 ED6 7FN MF IDC Reported Flow • RTO adjusts IDC Reported Flow to reflect 35MW relief already provided • Forward and Reverse adjusted to keep net equal to real net flow Actual Flows 300MW Snapshot 0MW -300MW 16

  17. Redispatch in Practice F R ED2 ED6 7FN MF IDC Reported Flow • Results • RTO non-firm = 35MW, not 50MW • IDC sees relief already provided by RTO, assigns more relief to CAs, who have not yet provided relief • Firm Service (for RTO and CAs) not touched until TLR5 Actual Flows 300MW Snapshot 0MW -300MW 17

  18. Benefits to NERC, the IDC, and RTOs • Number of TLRs will be reduced • Not giving credit for pre-TLR redispatch forces RTO to call TLR more often (to ensure equitable treatment under tariff) • IDC has more accurate data • RCs do not have unrealistic expectations of available relief • IDC does not display “ghost megawatts” that don’t exist • RTO participants contribute equitable share of relief • Execution of Reliable Control Actions are recognized • Proactive Constraint Management is not penalized 18

  19. Ensure Equity and Enhance Reliability • PJM and MISO ask that you: • Resolve real-time proactive redispatch undertaken to avoid TLR be treated as relief already provided if a TLR must be issued • PJM and MISO agree with NERC that more review must be done to determine how to consider actions taken in advance of real-time 19

  20. Questions? 20

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