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Non-Spinning Reserve Service Deployment Procedure

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Non-Spinning Reserve Service Deployment Procedure

Non-Spinning Reserve Service Deployment and Recall Procedure ERCOT Public

    ERCOT BUSINESS PRACTICE

Non-Spinning Reserve Service Deployment and Recall

    Procedure

    TAC Approved: November 4, 2010

    Version _0.3

    1

    Non-Spinning Reserve Service Deployment and Recall Procedure ERCOT Public Document Revisions

    Date Version Description Author(s)

    03/30/2007 0.1 TAC approved version

    08/11/2010 0.2 Updated to reflect changes to protocol and Colleen Frosch

    Current system implementation John Dumas

    Resmi Surendran

    10/4/2010 0.3 Market Rules Included Non-Spinning Reserve Service

    Deployment and Recall Procedure Revision

    Process

    i

    Non-Spinning Reserve Service Deployment and Recall Procedure ERCOT Public Approval Authority

    Title: Manager, System Operations

    Name: Colleen Frosch

    Sign: Colleen Frosch ______________Date 09-30-10 _____________________

    ii

Non-Spinning Reserve Service Deployment and Recall Procedure ERCOT Public

PROTOCOL DISCLAIMER

    This Business Practice describes ERCOT Systems and the response of these systems to Market Participant submissions incidental to the conduct of operations in the ERCOT Texas Nodal Market implementation and is not intended to be a substitute for the ERCOT Nodal Protocols (available at http://nodal.ercot.com/protocols/index.html), as amended from time to time. If any

    conflict exists between this document and the ERCOT Nodal Protocols, the ERCOT Nodal Protocols shall control in all respects.

    iii

    Non-Spinning Reserve Service Deployment and Recall Procedure ERCOT Public Table of Contents

    1. Nodal Market Non-Spinning Reserve Service Deployment and Recall Procedure .............5 2. Non-Spin Deployment ......................................................................................................5 3. Recall of Non-Spin Deployment .......................................................................................7 4. Non-Spinning Reserve Service Deployment and Recall Procedure Revision Process ........7

    iv

1. Nodal Market Non-Spinning Reserve Service Deployment and Recall Procedure

    There are three situations that will cause Non-Spinning Reserve Service (Non-Spin) to be deployed.

    ; Detection of insufficient capacity for energy dispatch during periodic checking of

    available capacity.

    ; Disturbance conditions such as a unit trip, sustained frequency decay or sustained low

    frequency operations.

    ; SCED not having enough energy available to execute successfully.

    In each case, the ERCOT operator will make the final decision and initiate the

    deployment. The ERCOT operator shall deploy Non-Spin in amounts sufficient to

    respond to the operational circumstances. This means that Non-Spin may be deployed

    partially over time or may be deployed in its entirety. If Non-Spin is deployed partially,

    it shall be deployed in increments of 100% of each Resource’s capacity. To support

    partial deployment, ERCOT shall, following the Day-Ahead Market (DAM), rank, for

    each hour of the Operating Day, the Resources supplying Non-Spin in an economic order

    based on DAM Settlement Point Prices Partial Non-Spin deployment and recall decisions

    shall be based on each Resource’s economic cost order.

2. Non-Spin Deployment

    ERCOT will deploy Non-Spin when AS capacity monitor shows (HASL Gen) ? 200 MW

    during normal load ramps and (HASL Gen) ? 500 MW during high load ramp/peak load hours

    or Physical Responsive Capacity ? 2500 MW. Emergency processes will govern the deployment

    of NSRS during Emergency state.

    2.1. Off-Line Generation Resource reserved for Non-Spin

    ; The QSE will be sent a Resource specific Dispatch Instruction that Non-Spin has

    been deployed.

    ; The Dispatch Instruction must include the expected amount of capacity that will be

    available for SCED and the anticipated duration of the deployment.

    ; The QSE must have the Resource On-Line and ready for SCED dispatch of Base

    Points within 25 minutes of the Dispatch Instruction.

    ; SCED will respond to the changes in Resource Status that are received by telemetry

    from the QSE. A typical sequence would be from OFFNS to ONTEST and to ON

    once the Resource is ready for SCED dispatch.

    ; Once the Resource is On-Line it is dispatched as any other Generation Resource

    including any provisions for processing generation less than the Resource’s LSL.

    ; The Resource must, at a minimum be capable of providing all the Non-Spin energy to

    SCED within 30 minutes of the Dispatch Instruction.

    ; The QSE will ensure that the Non-Spin A/S Schedule telemetry for that unit has been

    reduced to zero within 20 minutes of the Dispatch Instruction.

    2.2. Load Resource reserved for Non-Spin

    ; The QSE will be sent a Resource specific Dispatch Instruction that Non-Spin has

    been deployed.

    ; The Dispatch Instruction must include the MW level of load energy to be interrupted

    by the Load Resource and the estimated duration of the deployment. ; Non-Spin procured from a Load Resource block offer must be deployed as a block. ; The Load Resource must, at a minimum, interrupt not less than 95%, nor more than

    150% of the requested deployment energy within 30 minutes of the Dispatch

    Instruction.

    2.3. On-Line Generation Resource with an Energy Offer Curve

    ; The QSE will be sent a Resource specific Dispatch Instruction that Non-Spin has

    been deployed.

    ; The deployment will be for the total amount of capacity on that Resource that had

    been reserved for Non-Spin,

    ; ERCOT will automatically calculate new HASL constraints for SCED using the

    telemetry of the Resource’s Non-Spin Ancillary Service Schedule.

    ; The QSE shall reduce the Resource’s Non-Spin Ancillary Service Schedule to zero

    with in 20 minutes following a deployment instruction.

    ; The Resource must, at a minimum, be able to dispatch to its Non-Spin Resource

    Responsibility within 30 minutes of the Dispatch Instruction.

    2.4. On-Line Generation Resource with Output Schedules

    ; The QSE will be sent a Resource specific Dispatch Instruction that Non-Spin has

    been deployed.

    ; The Dispatch Instruction must include the additional amount of energy (MW) that

    needs to be produced by the Resource and the estimated duration of the deployment. ; For DSR’s providing Non-Spin, as soon as the QSE receives the deployment, ERCOT

    shall adjust the HASL for the Resource with the QSE provided Real-Time telemetry

    Non-Spin Schedule and the QSE shall adjust the telemetry Output Schedule and Non-

    Spin Schedule to reflect the Non-Spin deployment. A DSR QSE with a Load

    Resource that has provided Non-Spin will ensure that the Output Schedule is not

    reduced to reflect the load deployment if the Load Resource is part of the DSR Load

    that the Resource follows.

    ; For non-DSR’s (with Output Schedules) providing Non-Spin, ERCOT shall adjust the

    HASL for the Resource with the QSE provided Real-Time telemetry Non-Spin

    Schedule and shall increase the Output Schedule used in SCED by the difference

    between telemetry Non-Spin Responsibility and Schedule to reflect the amount of

    Non-Spin energy provided by the Resource in response to the Non-Spin deployment.

3. Recall of Non-Spin Deployment

    Non-Spin will be recalled when (HASL- Gen) ? deployed Non-Spin plus 500 MW and PRC is ?

    3000 MW.

    ; After recall, QSE will be allowed to control the unit down to its LSL at the Normal Ramp

    Rate and then trip it off-line if the QSE wants to shutdown the Resource. A QSE with a

    Generation Resource that was previously Off-Line will be allowed to keep the unit On-

    Line after minimum online time, provided the difference between its HSL and LSL have

    capacity to restore the AS Schedule to the AS Resource Responsibility.

    ; A QSE with a Generation Resource (with an Energy Offer Curve) that will stay On-Line

    will restore the Non-Spin A/S Schedule for that unit and let the ERCOT Resource Limit

    Calculator update the HASL prior to the next SCED execution. If the unit MW level is

    higher than the new calculated HASL then the unit will ramp to the new HASL at the

    SCED Down Ramp Rate.

    ; A QSE with a DSR Generation Resource (with an Output Schedule) that will stay On-

    Line will back out the Non-Spin addition that was made to the Output Schedule. This

    can be incrementally deleted depending on the size of the deployment and Normal Ramp

    Rate. For non-DSR Generation Resources, ERCOT will back out the deployed Non-Spin

    by the difference between telemetry Non-Spin Responsibility and Schedule. SCED will

    use the QSE submitted non-DSR Output Schedule once the Non-Spin schedule is restored

    ; A QSE with a Load Resource that has provided Non-Spin will ensure that the load energy

    and Non-Spin capability is restored within three hours from the expiration of the Non-

    Spin deployment. If it is not, the Non-Spin capability must be replaced by the QSE on

    other Generation or Load Resources capable of providing the service.

    4. Non-Spinning Reserve Service Deployment and Recall Procedure Revision Process Revisions to the Non-Spinning Reserve Service Deployment and Recall Procedure shall be made according to the approval process as prescribed in Protocol Section 6.5.7.6.2.3, Non-Spinning Reserve Service Deployment.

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