EMS/MMS Agenda – Thursday, November 30, 2006

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Texas Nodal Energy & Market Management System

EMS/MMS Projects

Requirement Documents

November 30, 2006

Al Hirsch

EMS/MMS Project Manager


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EMS/MMS Agenda – Thursday, November 30, 2006

EMS & MMS Project Status Update

Overview of Submitted Outage Scheduler Requirements

Report on TPTF Comments on MMS Requirements

Presentation & Overview of EMS/MMS Whitepapers


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EMS/MMS Agenda – EMS & MMS Project Status Update

MMS Phase 1 & Phase 2 Accelerated SCED Milestones


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MMS Phase 2 Milestones

SCED FAT

MMS FAT


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MMS Phase 2 – Accelerated SCED Delivery


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MMS Phase 2 – MMS Delivery


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MMS Phase 2 – Original Integrated MMS Delivery


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EMS FAT –Still A Target


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Presented By:Sai Moorty

MMS Project Engineer

EMS/MMS Agenda – Overview of Submitted Outage Scheduler Requirements


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EMS/MMS Agenda – Overview of Submitted Outage Scheduler Requirements

Outage Scheduler Requirements Document Submitted for TPTF Review on November 22, 2006

TPTF review comments due to ERCOT on December 8, 2006

Informal TPTF review feedback is that Outage Types listed in Requirements documents are more than that specified in the Nodal Protocols. ERCOT is of the opinion that the Outage Types listed in the

Requirements Document are needed. However, ERCOT is analyzing the feasibility of treating the Outage Types of concern as Sub-Types of Outage Types defined in the Nodal Protocols.


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EMS/MMS Agenda – Report on Received Comments on MMS Requirements

5 Spreadsheets detailing the disposition of TPTF review comments on MMS Requirements documents.

Accepted: Requirements document to be changed as per review comment.

Clarification Provided* : Requirements document to be changed as well as clarification provided in spreadsheet

Clarification Provided: Clarification provided in spreadsheet

Response: Moved to IDA Punch List – Issues predominantly pertaining to interfaces with other ERCOT systems.

Rejected: Review comment rejected as it does not comply with Nodal Protocols.


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EMS/MMS Agenda – Report on Received Comments on MMS Requirements

5 Clarification notes are also provided on the following topics: Explanation of Market Submission Items Ancillary Service Offer Modeling CRR related issues in DAM Pricing Issues with Fixed Quantity Block Offers and Bids in DAM Additional information regarding Competitive Constraint Test

Procedures (option to add this as an appendix to CCT Requirements document)


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EMS/MMS Agenda – Presentation Overview of Eight (8) EMS/MMS Whitepapers

Objective: Concurrence and disposition from TPTF of concepts described in

White Papers Refine design direction based upon TPTF feedback

Background: Requirements analysis of Real-Time Operations related to Load

Frequency Control (LFC) and its interaction with Security Constrained Economic Dispatch (SCED) raised some issues.

Subsequent discussions between ERCOT, Vendors (AREVA and ABB) and Floyd Trefny (Consultant) resulted in decision to submit White Papers to TPTF for review.


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HDL And LDL During Start up and AS Recall During Responsive Reserve recall if the calculated HDL falls below LSL then calculate:

HDL = LDL = Max (POWERTELEM - (SCED Down Ramp Rate * 5), LASL)

During Generation Resource startup when POWERTELEM is above 90% but less than LSL then calculate

LDL = HDL = Min (Actual Gen + (SCED Up Ramp Rate * 5), HASL)

During Generation Resource startup when POWERTELEM falls below 90% of LSL then calculate

HDL = LDL = POWERTELEM

SCED Base Point Dispatch QSEs will receive the following two Base Point values for each Resource:

The Base Point as calculated by SCED at every SCED execution The Updated Desired Base Point updated every 4 seconds by LFC. The Updated Desired Base Points

represent the ERCOT desired control each LFC cycle

Ancillary Service Schedules and Deployment Telemetry Expand the set of data to be telemetered from QSE to ERCOT to include the Ancillary Service

Resource Responsibility for each participating Resource


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Responsive Reserve Deployment and Recall ERCOT’s deployment of RRS to QSEs will include the following two

signals: RRS capacity deployment signal wherein each QSE will simply adjust their RRS schedule

on their Resources and wait for SCED to produce new Base Points that can include additional Responsive Reserve MW requirement.

RRS energy deployment signal that requires each QSEs to produce that additional energy through their own deployment to its Resources providing RRS.

QSE’s telemetry to ERCOT will include the following two signals: Signal to indicate the RRS Resource Responsibility Signal to indicate the remaining RRS Ancillary Service Schedule that is the difference

between the RRS Resource Responsibility amount and deployed amount. Non-Spin Deployment Notification and Availability

QSEs are requested to provide to ERCOT two data items related to Non-Spin: Non-Spin Responsibility (reflects Non-Spin obligation for the Resource where deployed or

not deployed) Non-Spin Ancillary Service Schedule (normally equal to Non-Spin responsibility, changes

to zero when the QSE makes the Resource available for dispatch following an ERCOT request for Non-Spin deployment, and returns to the Non-Spin responsibility value when ERCOT recalls Non-Spin).


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Base Point above HASL Flags It will not be necessary to implement either the “Base Point above HASL”

or “Pseudo-Resource Dispatch” flags in the ICCP telemetry to QSEs Indication of Pseudo-Resource Dispatch will be provided in the MIS Secure

Area

Coincidental Deployment of Up and Down Regulation LFC should not be artificially constrained in a way that regulation

deployment of some QSEs may have opposite signs from the other QSEs

Emergency Base points Calculation and Deployment During SCED failure, Emergency Base Points will be calculated and issued

to QSEs through Generation Subsystem in the EMS. Distribution of Emergency Base Points will cause the current regulation deployment to be reset the same as an update of the SCED solution


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EMS/MMS Agenda – Conclusion

Wrap-Up

Next Steps

EMS/MMS Agenda – Thursday, November 30, 2006

Documents

Transcript of EMS/MMS Agenda – Thursday, November 30, 2006