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Subject: RE: [energyinterop] Extra Attributes on Products

A typical market (or product?) is AC real energy. I might access that power at 120V nominal voltage, or 240 or 480. The meter records actual instantaneous demand as well as integrated kWh per time interval no matter what the delivered AC voltage is. I might be billed on real energy plus some charge based on instant demand (kW over a short window). I might get billed for power factor.


The market product is real energy. I purchase X kWh for some future time interval. I don’t think we can have demand ratchets, but we still might have penalties for demand peaks or bad power factor.


However, if I use DC, where is the generator? Maybe I have local PV on a DC microgrid. The market only sells DC power, and I am billed based on my metered kWh. It is still real energy. I don’t have the complications of reactive power and power factor. The meter tracks instant voltage. It still doesn’t matter where the transformers are and what the nominal voltage is at the meter, does it?


And what if the generator is some coal plant 50 miles away? It seems in that case I would always be purchasing AC power and that if I want DC I have to transform it behind my meter (or I am on a microgrid that is buying some AC power and transforming it to then sell me DC power in a separate microgrid market).


So is AC/DC part of the product definition or market context? What decides this now?




From: energyinterop@lists.oasis-open.org <energyinterop@lists.oasis-open.org> On Behalf Of wtcox
Sent: Thursday, March 18, 2021 10:11 AM
To: energyinterop@lists.oasis-open.org
Subject: Re: [energyinterop] Extra Attributes on Products


Makes some sense to me, but not all CTS-supporting markets are electricity markets.


Having the capability of describing Hz and voltage is important, but it can be in the marketContext (per market) or product definition (per product) where electricity is the resource.


The choice of the TE user would be at the market level for Toby's suggestion, at the product level in the initial proposal. I suspect this would be a configuration, not an operational change.


But we need to consider non-electricity markets. I doubt that Hz is meaningful in water or natural gas markets, so would this be a cached-in-market-context approach?







On 3/18/21 9:18 AM, Considine, Toby wrote:

The original EMIX was imagining a global market-place, where 220 V power and 110V power might coexist in the same market. It really walked past DC microgrids entirely, which have been growing in import, largely through the efforts of the E-Merge alliance. Frequency is one of the attributed communicated.


Try as I might, I cannot think of a CTS market in which European Power and North American power coexist. I cannot see AC and DC in the same CTS market. 


I would like to make these attributes part of the market context, and exclude them from the individual product definitions. This would simplify the CTS product descriptions (Everything in this market is for 110 volt power. or 220, and all is DC). Any comments?




William Cox 

Email: wtcox@CoxSoftwareArchitects.com 

Web: http://www.CoxSoftwareArchitects.com 

+1 862 485 3696 mobile


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