SCED Failure When RLC sees that the SCED solution has not updated within the last 425 seconds, emergency base points (EBP) will automatically activate. Any time EBPs are activated, SCED solutions are being blocked from being communicated to MPs. NOTE The RLC Control Parameters (SCED Failure Threshold) should be set to seconds. This is due to a code that adds 300 seconds to the 125 125 seconds from SCED Failure Threshold Parameter in the display, so total number of seconds RLC waits for SCED solution is 425 before enabling the emergency base points. During System Failures, Emergency Base Point (EBP) or instructing a QSE to go on Constant Frequency Control (CFC) Frequency within +/- 0.03 Hz of schedule Normal with – available regulation Frequency within +/- 0.05 Hz of schedule When returning to – Normal Operations with available regulation Frequency maintained within +/- 0.09 Hz of schedule Balancing – Authority ACE Limit (BAAL) If for some reason a manual EBP is required for a Resource, communicate the Resource name, MW output requested, start time and NOTE duration of the dispatch instruction to the QSE representing the Resource. IF: Any module of the SCED Workflow Controller fails; 1 THEN: Manually run the SCED process. IF: SCED still fails after manually running, AND EBPs have automatically activated; THEN: Contact the Help Desk, 2 Initiate the Watch Hotline call to QSEs, Notify Resource Operator to post a message on MIS Public, Notify Transmission Operator to make Hotline call to TOs. Q#27 - Typical Hotline Script for Watch for SCED Failure EMP Applications>Generation Area Status>Related Displays>ERCOT Nodal Summary MONITOR: 3 Regulation Service (Up/Dn) margins to ensure frequency can be adequately maintained. IF:
SCED Failure NOTE When RLC sees that the SCED solution has not updated within the last 425 seconds, emergency base points (EBP) will automatically activate. Any time EBPs are activated, SCED solutions are being blocked from being communicated to MPs. The RLC Control Parameters (SCED Failure Threshold) should be set to 125 seconds. This is due to a code that adds 300 seconds to the 125 seconds from SCED Failure Threshold Parameter in the display, so total number of seconds RLC waits for SCED solution is 425 before enabling the emergency base points. During System Failures, Emergency Base Point (EBP) or instructing a QSE to go on Constant Frequency Control (CFC) Frequency within +/- 0.03 Hz of schedule – Normal with available regulation Frequency within +/- 0.05 Hz of schedule – When returning to Normal Operations with available regulation Frequency maintained within +/- 0.09 Hz of schedule – Balancing Authority ACE Limit (BAAL) NOTE If for some reason a manual EBP is required for a Resource, communicate the Resource name, MW output requested, start time and duration of the dispatch instruction to the QSE representing the Resource. 1 IF: Any module of the SCED Workflow Controller fails; THEN: Manually run the SCED process. 2 IF: SCED still fails after manually running, AND EBPs have automatically activated; THEN: Contact the Help Desk, Initiate the Watch Hotline call to QSEs, Notify Resource Operator to post a message on MIS Public, Notify Transmission Operator to make Hotline call to TOs. Q#27 - Typical Hotline Script for Watch for SCED Failure 3 EMP Applications>Generation Area Status>Related Displays>ERCOT Nodal Summary MONITOR: Regulation Service (Up/Dn) margins to ensure frequency can be adequately maintained. IF:
Real_Time_Desk_Operating_Procedure.docx