emix — archive

Do we need reserves?

From: Sean Crimmins <[email protected]>
To: [email protected]
Date: Fri, 29 Oct 2010 16:03:00 -0000

Toby, Ancillary Services are defined as products in the CIM and in wholesale markets that I'm aware of. I don't see what we gain out of this re-definition. You could make the argument sure, but to what ends? Does it help? Sean ________________________________ From: Toby Considine [[email protected]] on behalf of Toby Considine [[email protected]] Sent: Thursday, October 28, 2010 2:29 PM To: [email protected] Subject: [emix] Do we need reserves? Ed C and I were comparing notes this afternoon, and it struck me that Reserves are just Options. Recall that the core EMIX types are Emix, Options, and Resources. All three of them have a Product as one of their elements. I got to wondering whether Option, whose current definition is that from the CIM, and reserves are the same. A reserve is a promise to respond if asked within a certain time frame. If that promise is made by a slow starting generator, then it cannot make that promise unless it is already spinning. Hence the term Spin-Reserve. An option is a promise to sell a product at a set price, if asked within a period. The CIM option includes a response time to provide the product. I think that all the reserves are *really* Option Products. The difference between Spinning Reserve, Non-Spinning Reserve, and Operating Reserve is the warranted response time within the option. Options currently do not have a start time or duration in our schema. Clearly they must have a scheduled duration, unless they are eternal. I think options could have their own WS-Calendar sequence, fully scheduled. That sequence could be a single interval. (This generator is spinning reserve for the rest of the day.) It could be a set of intervals. (Weekdays from 11:00 to 6:00 for the next month, this generator promises to respond in 10 minutes to provide 50 MW of power for up to 5 hours) The 50MW of power for up 5 hours is the Product. The Response time is the optionExcerciseLeadTime as defined in the CIM Option we already have. Weekdays from 11:00 to 6:00 for the next month is simply a Sequence. This approach converts all reserves into classes of options, some for different products… Please discuss. tc ________________________________ “It is difficult to get a man to understand something, when his salary depends upon his not understanding it” -- Upton Sinclair. ________________________________ Toby Considine TC9, Inc OASIS Technical Advisory Board TC Chair: oBIX & WS-Calendar TC Editor: EMIX, EnergyInterop U.S. National Inst. of Standards and Tech. Smart Grid Architecture Committee Email: [email protected]