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NPRR348
Summary
| Title | Generation Resource Start-Up and Shut-Down process |
|---|---|
| Next Group | |
| Next Step | |
| Status | Approved on 09/20/2011 |
| Effective Dates |
08/29/2012
|
Action
| Date | Gov Body | Action Taken | Next Steps |
|---|---|---|---|
| 09/20/2011 | BOARD | Approved | |
| 08/04/2011 | TAC | Recommended for Approval | Board consideration |
| 07/21/2011 | PRS | Recommended for Approval | TAC consideration |
| 07/07/2011 | TAC | Remanded | PRS consideration |
| 06/23/2011 | PRS | Recommended for Approval | TAC consideration |
| 05/19/2011 | PRS | Recommended for Approval | PRS consider the IA and CBA |
| 04/21/2011 | PRS | Deferred/Tabled | PRS consideration |
Voting Record
| Date | Gov Body | Motion | Result |
|---|---|---|---|
| 09/20/2011 | BOARD | To approve NPRR348 as recommended by TAC in the 8/4/11 TAC Report. | Passed |
| 08/04/2011 | TAC | To recommend approval of NPRR348 as recommended by PRS in the 7/21/11 PRS Report | Passed |
| 07/21/2011 | PRS | To recommend approval of NPRR348 as amended by the 7/20/11 Luminant Energy comments and as revised by PRS. | Passed |
| 07/07/2011 | TAC | To remand NPRR348 to PRS. All Market Segments were present for the vote | Passed |
| 06/23/2011 | PRS | To endorse and forward the 5/19/11 PRS Report, Impact Analysis, and Cost Benefit Analysis for NPRR348 to TAC with a recommended priority of Critical and rank of 8.4. | Passed |
| 05/19/2011 | PRS | To recommend approval of NPRR348 as submitted. | Passed |
| 04/21/2011 | PRS | To table NPRR348 for one month. | Passed |
Background
| Status: | Approved |
|---|---|
| Date Posted: | Apr 6, 2011 |
| Sponsor: | ERCOT |
| Urgent: | No |
| Sections: | 3.9.1, 6.4.2.4, 6.4.3, 6.5.7.2, 6.5.7.8, 6.6.5, 8.1.1.4.1 |
| Description: | As part of this Nodal Protocol Revision Request (NPRR), Protocol language concerning the use of the "ONTEST" Resource Status during Start-Up and Shut-Down has been removed. Language has been added to address the Start-Up and Shut-Down processes. For Start-Up, language is added so that Resources are exempt from Base-Point Deviation Charges and Generation Resource Energy Deployment Performance (GREDP) metrics when the Resources average base-point value is below the average telemetered Low Sustainable Limit (LSL). The expectation is that when a Resource is receiving base-points below its LSL, the Resource is starting up/shutting down and not necessarily responding to Security Constrained Economic Dispatch (SCED) instructions. For Shut-Down, a new Resource Status is created called "SHUTDOWN". This status will be used by the Resource Limit Calculator (RLC) to calculate dispatch limits for SCED which ramp a Resource down to 0 MW according to the Resource’s provided ramp rate. Again, a Resource will be exempt from Base-Point Deviation Charges and GREDP metrics when the Resource’s average base-point is below the average telemetered LSL. |
| Reason: | Under the current Nodal Protocols, a Resource Status of "ONTEST" is telemetered for Resources that are either starting up or shutting down. This potentially causes two problems for the ERCOT system and the ERCOT Operators. The first problem can occur when a Qualified Scheduling Entity (QSE) telemeters a Resource Status of "ONTEST" and SCED sends a Base Point to that Resource equal to its current telemetered output. This results in ERCOT deploying Regulation to account for any movement by that Resource between SCED executions. There have been periods when a number of Resources have started up or shut down quickly and simultaneously. This can cause frequency issues and may result in ERCOT manually executing SCED and deploying additional Ancillary Services. These concerns will be greatly reduced if Resources are required to follow SCED instructions when they are receiving base-points at or above their LSL. A new "SHUTDOWN" Resource Status will force SCED to Dispatch a Resource down to 0 MW according to its ramp rate. This will ensure that when a Resource is intending to shutdown, SCED will only be ramping the Resource down and not changing ramp direction. This logic will provide ERCOT visibility to where the Resource is planned to go in the next five minutes and will provide a method for a Resource to come off-line as required even if it is operating above its LSL. The second problem is that ERCOT Operators are not currently able to distinguish easily between periods when Generation Resources are performing testing and when they are starting up/shutting down. Discontinuing the use of "ONTEST" during start-up/shut-down will address this concern. |
Key Documents
Apr 6, 2011 - doc - 240.5 KB
Apr 6, 2011 - xls - 175 KB
Apr 6, 2011 - doc - 59.5 KB
Apr 26, 2011 - doc - 258.5 KB
May 12, 2011 - doc - 210.5 KB
May 24, 2011 - doc - 259.5 KB
Jun 28, 2011 - doc - 260.5 KB
Jul 6, 2011 - doc - 38.5 KB
Jul 11, 2011 - doc - 264 KB
Jul 20, 2011 - doc - 211 KB
Jul 26, 2011 - doc - 270.5 KB
Aug 3, 2011 - doc - 59 KB
Aug 3, 2011 - xls - 186 KB
Aug 5, 2011 - doc - 271.5 KB
Sep 20, 2011 - doc - 273.5 KB