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Comparison of the Operating Reserve Demand Curve & Physical Responsive Capability during the January 6 th event. John Dumas Director of Wholesale Market Operations TAC January 28, 2014. PRC and ORDC were different due to two main factors. @7:10 PRC = 1453 MW and ORDC = 2351MW

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Comparison of the Operating Reserve Demand Curve & Physical Responsive Capability during the January 6th event

John Dumas

Director of Wholesale Market Operations

TAC

January 28, 2014

prc and ordc were different due to two main factors
PRC and ORDC were different due to two main factors
  • @7:10 PRC = 1453 MW and ORDC = 2351MW
  • The following two factors created the difference
    • PRC is limited to 20% of HSL while ORDC considers all the available capacity
      • One large unit near LSL due to startup mode which resulted in a 454 MW difference
      • Congestion management created a difference
        • During the 7:10 SCED interval there were 10 active constraints
        • 7 of the 10 were violated and were at the max-Shadow Price
        • SCED had an under-gen value of 689 MWs (i.e. violating power balance by 689 MWs)
    • Load Resources did not update their schedules timely
      • Resulted in 140 MW difference
managing constraints with offers at swcap
Managing Constraints with Offers at SWCAP
  • At 7:10
    • 2577 MWs had offers at the SWCAP due to Proxy extensions, Responsive & Regulation offer floors & competitive offers
    • 41 Resources dispatched down due to congestion management because they had a positive SF to constraints and because they offered part of their capacity at SWCAP
    • 33 of the 41 Resources contributed 365.2MW to the difference between PRC & ORDC.
    • 20 of the 33 units contributed about 360MW of the 365.2 MW
    • 8 of these 20 Resources had offers at SWCAP due to RRS capacity
summary
Summary
  • Consider submitting a protocol revision to not count units in startup or shutdown mode in either PRC or ORDC calculations
  • We have added an additional check to the Load Resource Deployments which will fix the 140 MW error in ORDC going forward. This check was already in place in PRC
  • Recognize that SCED will dispatch based on economics. SCED will violate power balance if it is cheaper.
    • Due to high unit offers in conjunction with congestion contribution (i.e. SCED compares cost of generation plus cost of the transmission penalty to the power balance penalty cost)
summary1
Summary
  • Part of the Responsive Reserve capacity that was on generation was released automatically to SCED when the frequency dropped below the 59.91Hz trigger.
  • Responsive Reserve on generation was never manually deployed therefore part of the capacity was never made available to SCED.
    • If MWs are trapped behind the HASL SCED can not help with power balance and if more than 20% of a unit’s capability is trapped, it will create a difference between PRC & ORDC
    • This can place a greater strain on regulation providers and frequency.