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Subject: [OASIS Issue Tracker] Commented: (EMIX-3) 2.2.2 - The CAISO markethas a three part bid that includes start-up cost and min load compensation. They can't be taken separately.
[ http://tools.oasis-open.org/issues/browse/EMIX-3?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=20986#action_20986 ]
Edward Cazalet commented on EMIX-3:
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WS-Calendar provides a way for a generator to specify a specific delivery profile characterizing the start up-time, the ramp up to a committed level of energy production and the same when the generator is ramped down and shut off.
The CAISO and other ISO/RTOs and centrally dispatched markets can accept such a fixed schedule for a generator but also allow for 3-part bids (offers) from generators. A bilateral contract for a specific generator to a buyer may uses either a fixed schedule or 3 part offers where dispatch flexibility as assigned to the buyer party.
There is no fixed profile of generation in these 3-part generator offers which allows the centrally dispatched markets to dispatch the generators along with other generators and flexible to loads to minimize the total cost of generation to meet the load.
One element of the 3-part offer is an offer curve that generally applies to a set of intervals. Each offer curve has a number of segments. Each segment is the offer for an increment of output of the generator at an offer price. As the output increases the price is higher.
A second element of the 3-part offer is separate price to start-up the generator and bring it to its minimum operating level.
A third element of the 3-part offer is a ramp rate curve that specifies the maximum rate (MW/min) at which the generator can be asked to increase it output when it is at various levels of current output (Note the maximum ramp rate is not a function of time). There is often a different ramp rate curve in the up direction and the down direction.
A generator may make a differenct 3-part offer in different periods of time ( for expample the price of natural gas fuel may be different every day and therefore change the generator offer curve each day). The start-up costs also involve fuel and can there for change as natural gas costs change. The ramp rate curve is generally less time dependant.
There can be many other elements to the offer for a generator, especially if it is a combined cycle generator. The ISO/RTO will use the generator offers to compute the best generator output in each interval which will a produce a schedule of generation output that could be characterize by WS_Calendar.
I will leave it to our IRC members to flesh out the details of the modeling of the generator offers (The CIM already has some of this). In Energy Interop or eMIX I assume we will have to characterize such generator offers. I see such offers as an eMIX Market Product with its own set of elements. And because of the complexities of various generators and markets, extensibility will be needed.
> 2.2.2 - The CAISO market has a three part bid that includes start-up cost and min load compensation. They can't be taken separately.
> -------------------------------------------------------------------------------------------------------------------------------------
>
> Key: EMIX-3
> URL: http://tools.oasis-open.org/issues/browse/EMIX-3
> Project: OASIS Energy Market Information Exchange (eMIX) TC
> Issue Type: Improvement
> Components: spec
> Affects Versions: wd06
> Environment: CAISO Sean Crimmins
> Reporter: Toby Considine
> Assignee: Brian Zink
>
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