Price Corrected SCED Violated Constraints

This section describes interfaces used to retrieve price corrected binding constraint in SCED. Price Corrected SCED Violated Constraints are only provided for RTM market. The request message would use the following message fields:

Message Element	Value
Header/Verb	get
Header/Noun	SCEDViolatedConstraintsPC
Header/Source	Market participant ID
Header/UserID	ID of user
Request/StartTime	Start time of interest
Request/EndTime	End time of interest

The corresponding response messages would use the following message fields:

Message Element	Value
Header/Verb	reply
Header/Noun	SCEDViolatedConstraintsPC
Header/Source	ERCOT
Reply/ReplyCode	Reply code, success=OK, error=ERROR or FATAL
Reply/Error	Error message, if error encountered
Payload/	ShadowPriceCorrections

The structure of ShadowPriceCorrections are described by the following diagram:

ShadowPriceCorrections Structure

ShadowPriceCorrection Structure

The following elements are used to report price corrections for real-time shadow prices:

SCED Timestamp
Constraint ID
Constraint Name
Contingency Name
Original Shadow Price
Corrected Shadow Price
Original Limit
Corrected Limit
Original Value
Corrected Value
Price Correction Timestamp

The following is an XML example:

<ns1:ShadowPriceCorrections xmlns:ns0="http://www.ercot.com/schema/2007-05/nodal/eip/il"
    xmlns:ns1="http://www.ercot.com/schema/2007-06/nodal/ews">
    <ns1:ShadowPriceCorrection>
        <ns1:timestamp>2012-01-05T11:00:00-06:00</ns1:timestamp>
        <ns1:constraintID>1</ns1:constraintID>
        <ns1:constraintName>ABC</ns1:constraintName>
        <ns1:contingencyName>DEFGHIJ1</ns1:contingencyName>
        <ns1:shadowPriceOrig>995.45</ns1:shadowPriceOrig>
        <ns1:shadowPriceCorrected>786.59</ns1:shadowPriceCorrected>
        <ns1:limitOrig>32.3</ns1:limitOrig>
        <ns1:limitCorrected>32.3</ns1:limitCorrected>
        <ns1:valueOrig>32.3</ns1:valueOrig>
        <ns1:valueCorrected>32.3</ns1:valueCorrected>
        <ns1:priceCorrectionTime>2012-01-10T14:06:42-06:00</ns1:priceCorrectionTime>
    </ns1:ShadowPriceCorrection>
</ns1:ShadowPriceCorrections>