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CFE-ERCOT DC-Ties Commercial Operations. ROS December 2007 Carlos Gonzalez-Perez ERCOT Operations Support. ERCOT DC-Ties. ERCOT-CFE Operational DC-Ties Eagle Pass (DC_S, 36 MW) Laredo Variable Frequency Transformer (DC_L, 100 MW) Sharyland Railroad (DC_R, 150MW) - PowerPoint PPT Presentation
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ROS December 2007
Carlos Gonzalez-PerezERCOT Operations Support
CFE-ERCOT DC-Ties Commercial Operations
1 10/30-31/2007CFE/ERCOT/AEP Meeting – Mexico City
ERCOT DC-Ties
ERCOT-CFE Operational DC-TiesEagle Pass (DC_S, 36 MW) Laredo Variable Frequency Transformer
(DC_L, 100 MW)Sharyland Railroad (DC_R, 150MW)
ERCOT-SPP Operational DC-TiesNorth DC-Tie (DC_N, 220 MW)East DC-Tie (DC_E 600 MW)
DC_N220 MW DC_E
600 MW
DC_S36 MW
DC_L100 MW
DC_R150 MW
2 ROS Meeting – December 2007
Commercial Operational Aspects
3 ROS Meeting – December 2007
Future Commercial Ops. of the DC-Ties
ERCOT management of the scheduling process in the South DC-Ties will be similar to the North DC-Ties
Minimal modifications to the ERCOT systems will be necessary
CFE to establish a NERC E-Tag operation for transactions between Mexico and ERCOT (and vice versa)
4 ROS Meeting – December 2007
ERCOT DC-Ties Scheduling Process
Schedule Checkout with Interconnected CA
Implement eTag Schedules with DC Tie Operators
QSEOATI Scheduling Agent
& Software Services
SPP/CFE DC Tie
Scheduling Function
Submit E-Tag Schedules
Arrange for DC Tie Capacity
Submit DC Tie Market Schedules
DC TieOperator
Match E-Tag Schedules to ReservationsManage DC Tie Scheduling Process
Approve eTag Schedules
Match eTag Schedules to Market SchedulesApprove eTag Schedules
Checkout Metered Flows with DC Tie OperatorERCOT DC Tie
Scheduling Schedule Checkout with Interconnected CA
5 ROS Meeting – December 2007
Proposed Day Ahead Operations – Limit Calculations
Limits are initially calculated Daily (can be changed to weekly, etc)
CFE to provide ERCOT limits by 16:00Most constrained transfer limits will be made
public and postedLimits will be recalculated in real-time based on
system conditions as needed
CFE Day Ahead Transfer Limits
ERCOT Day Ahead Transfer Limits
Tie De-Ratings
LIMIT Set to the Lower of all the
Values
6 ROS Meeting – December 2007
Schedule Curtailment Process
7 ROS Meeting – December 2007
Inadvertent AccountingScheduled Energy: Calculated from the NERC E-
TagActual Energy:
Real-time SCADA hourly integrated. For hourly monitoring
EPS meter true-up 7 days after the factDaily Check-out:
Between ERCOT Operator and Tie Operator after midnight
Define payback in kind schedules, if the Inadvertent Balance larger than X MWh
Monthly True-up Between CFE and ERCOTKeeping up with the Inadvertent Account Balance
8 ROS Meeting – December 2007
Before going into Commercial Operations
Finalize Operating procedures for the South DC-Ties
Finalize an Emergency Assistance Agreement with CFE
Finalize Inadvertent agreement with CFECFE to have an E-Tag operation in placeERCOT to finalize the testing of ERCOT
systemsTie Operator systems readyCFE declare ready for Commercial
Operations9 ROS Meeting – December 2007