Title Addition of Integral ACE Feedback to GTBD Calculation
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Next Step
Status Approved on 06/14/2016


Date Gov Body Action Taken Next steps
06/14/2016 BOARD Approved
04/28/2016 TAC Recommended for Approval Board for consideration
04/14/2016 PRS Recommended for Approval TAC for consideration
03/10/2016 PRS Recommended for Approval PRS for Impact Analysis review

Voting Record

Date Gov Body Motion Result
06/14/2016 BOARD To approve SCR788 as recommended by TAC in the 4/28/16 TAC Report Passed
04/28/2016 TAC To recommend approval of SCR788 as recommended by PRS in the 4/14/16 PRS Report Passed
04/14/2016 PRS To endorse and forward to TAC the 3/10/16 PRS Report and the Impact Analysis for SCR788 with a recommended priority of 2016 and a rank of 1640 Passed
03/10/2016 PRS To recommend approval of SCR788 as submitted Passed


Status: Approved
Date Posted: Feb 1, 2016
Sponsor: Mike Noth on behalf of the Performance, Disturbance, Compliance Working Group (PDCWG)
Urgent: No
Description: This System Change Request (SCR) updates the formula used by the Resource Limit Calculator to calculate the Generation To Be Dispatched (GTBD) value. The update will include the addition of Area Control Error (ACE) Integral times a configurable factor that captures the long-term Dispatch trend to help minimize GTBD oscillations from one Security-Constrained Economic Dispatch (SCED) interval to the next. The analysis further shows that having an Integral ACE feedback would reduce the amount of manual Time Error corrections performed. Integral ACE is calculated from Raw ACE by integrating the raw ACE value over a configurable amount of time (X seconds) and adding it to the previous 4 second Integral ACE, as shown below: Integral ACE (current 4 sec) = Integral ACE(last 4 sec) + [(Raw ACE(Current 4 sec)*(Current Time – Last AGC run time))/X] In general, Integral ACE provides a good indication of which direction ACE has been trending.
Reason: Market efficiencies or enhancements

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