[OASIS Issue Tracker] Commented: (EMIX-499) PAP03 Req #16: apparentgap; storage

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    [ http://tools.oasis-open.org/issues/browse/EMIX-499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=26910#action_26910 ] 

Edward Cazalet  commented on EMIX-499:
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Storage,  all other distributed resources, and dynamic load management are supported by EMIX through communication of current and forward tenders that convey both the price and quantity tendered over arbitrary sequences (schedules) of intervals.

PAP 07 and IEC 61850 deal with storage dispatch using price information and other more direct dispatch methods.  The link to the report is as follows: 

    http://collaborate.nist.gov/twiki-sggrid/pub/SmartGrid/PAP07Storage/Specification_for_PV_Inverter_Interactions_Using_61850_v15a.pdf

Section 3.4 of this report is on "Scheduling Using Pricing Signals (or Value) of Energy".  The section states:

"Pricing Signal Schedules use an absolute price or some relative value of energy to allow autonomous systems to decide what actions to take. The pricing signal may reflect the actual price of energy in a TOU, CPP or dynamic pricing program, or it may be an abstract indicator of how the value of energy varies throughout the day or week.

The pricing signals in the schedule may be common across a wide geographical area, or may vary by location (Locational Marginal Pricing (LMP)), or may take into account specific substation or feeder requirements and/or constraints. Autonomous storage systems will apply this information to make decisions, likely in conjunction with other configuration and preference data, using vendor-specific methods to manage the actual charging and discharging of the storage element."

EMIX deals with storage, DER, and load shaping in this autonomous mode that uses price signals. EMIX provides an information model to communicate current and forward prices by geographic area or by location.  EMIX does not and should not specify how the autonomous storage systems will apply this information to make decisions.  EMIX does provide an information model to comunicate the results of the decisions as quantites for current and forward intervals.

While it is out of scope for EMIX to specify how  to use the EMIX information models, it is clear that EMIX provides tenders with a price and a quantity to communicate forward prices ( a schedule of prices).  Using this mechanism, grid stability is supported by offering a price only for changes in storage input and output that the grid can accomodate.  Further current and forward tenders can then be used by a grid operator or others to fine tune the transactions between the storage operator and the counter parties to the storage operator. The storage operator remains in control of his storage resource while responding to tenders and perhaps making tenders. Continuing interactions between the storage operator and counterparties can lead to efficient dispatch and dynamic redispatch as grid conditions, constraints and grid prices change.

Use of a price, quantity pair for a tender is an alternative to comunicating a price with a requirement for a random response.  More precise response is afforded by a price quanity tender than a price only tender or a non actionalble "price signal" with a random response.

I recommend that this issue be closed as it clearly meets the stated requirment of "Common, timely, and actionable price information enables storage, such as electric-charging and thermal-storage technologies for homes and buildings"




> PAP03 Req #16: apparent gap; storage
> ------------------------------------
>
>                 Key: EMIX-499
>                 URL: http://tools.oasis-open.org/issues/browse/EMIX-499
>             Project: OASIS Energy Market Information Exchange (eMIX) TC
>          Issue Type: Sub-task
>    Affects Versions: CSD03/PR03
>         Environment: Aaron Snyder
>            Reporter: Aaron Snyder 
>            Assignee: William Cox
>
> Requirement Text:
> Common, timely, and actionable price information enables storage, such as electric-charging and thermal-storage technologies for homes and buildings.
> Apparent gap:
> Storage is not directly supported in the model except by the enumerated classification of the ResourceTypeEnumerated.

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