RE: [emix] Groups - EmixPowerProducts-WD12-20101021.zip uploaded

["Ed Cazalet" <ed@cazalet.com>]

Toby has asked for comments on offer and transaction definition and ramping or response rates with respect to product definition:

I believe the following description of offers and transactions generally follows current practice in commercial and financial transactions for any commodity where delivery interval is important including offers and transactions for electric energy.  It also follows what I believe we have previously discussed in eMIX and TeMIX.

I first define offers(1.0), transactions(2.0) and then address ramp or response rate constraints (3.0) on such offers.

1.0) "Simple" Offers and Transactions:

1.1) Offer:  An offer for energy (power) is a tender by one party to another party to buy or sell a quantity of energy during a specific delivery interval (start time, duration ) at a price.  An offer can be designated to be transacted as "all or none" or "partial acceptance allowed". 

1. 2)  Transaction:  A transaction for energy is an agreement between two parties to buy or sell a quantity of energy during a specific delivery interval (start time, duration) of time at a price.  A transaction may be the result of a market or negotiation process, a regulated tarrif, or other process.

2.0) Offer and Transaction Vectors :  a vector of offers or a vector of transactions for multiple delivery intervals 

2.1) Independent Offers and Transactions: Each of which are offers and transactions as defined above that are independent of each other.

2.2) Compound Offers and Transactions: A compound offer combines several offers.  A compound offers requires all or none of the offers to be transacted.

3.0) Ramping Considerations:

Physical devices producing and consuming electric energy may have limited ramping capability in relation to the delivery intervals for the offers and transactions above.  Addionally, a lead or response time may be necessary between a command to respond and actual intiation of a response.

Ramping limits can be defined in two ways:

3.1) If an offer or transaction transfers some control of a resource to a party, then ramping may be expressed as a curve of maximum rate of change in power ( MW/minute, for example). Often this curve is a expressed as a series of linear curve segements as a function of the power level.

3.2) If the offer or transaction is for a fixed profile of energy delivery over a set of delivery intervals then ramping is express as a profile where for example there may be a first interval during which power increases, a second interval during which power delivery is constant, and a third interval during which power delivery declines.

Ed


Edward G. Cazalet, Ph.D.
101 First Street, Suite 552
Los Altos, CA 94022
650-949-5274
cell: 408-621-2772
ed@cazalet.com
www.cazalet.com

-----Original Message-----
From: toby.considine@unc.edu [mailto:toby.considine@unc.edu] 
Sent: Thursday, October 21, 2010 6:19 AM
To: emix@lists.oasis-open.org
Subject: [emix] Groups - EmixPowerProducts-WD12-20101021.zip uploaded

I need some strong comments about Offers vs Transactions and the ways to
describe the same products.

i.e.
An offer promises a response rate
A transaction specifies a response window

 -- Toby Considine

The document named EmixPowerProducts-WD12-20101021.zip has been submitted
by Toby Considine to the OASIS Energy Market Information Exchange (eMIX) TC
document repository.

Document Description:
Updated XSDs for WD12

Ancillay.xsd is no more; it has been incorporated into resources
Resource.xsd now includes the arrays of inverters from the PAP07 DER
document submitted.
More consistent use of productDescription, productSchedule, and product

View Document Details:
http://www.oasis-open.org/committees/document.php?document_id=39928

Download Document:  
http://www.oasis-open.org/committees/download.php/39928/EmixPowerProducts-WD12-20101021.zip


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