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Subject: RE: problem of sending signals to participants form multiple sources
Gale, I’m going to kill two birds with one
stone and also cc my response to the EI list. Bear in mind that my response below is
within the context of what we discussed during the 1.0 drafting of the spec,
although I suspect the EI will come to similar conclusions. Just like as shown in figure 6, we did in
fact identify scenarios where someone may receive signals from multiple sources.
The conclusion we came to at the time was that how any conflicts between
signals get resolved was beyond the scope of our specification. What this
means is that if this is a potential conflict exists then it will need to be resolved
either by the receiver of the signals or the senders. The implications to
the specification we wrote were that the most we were willing to do to help
resolve conflicts was to add an attribute identifying the source of the signals.
Anything beyond that would require some sort of coordination between the
different entities sending the signals and we didn’t want to go down that
road. Of course the receiver can also resolve any conflict himself, and
while they might feed back some information concerning how they resolved the
conflict it probably does not affect the downstream DR signal itself. Note that I think that much of what is
done today to help resolve these issues is on a contractual basis. Customers
often sign contracts with either Aggregators or Utilities which preclude this
situation from occurring. Some aspect of this might be reflected in the transactional
energy model. Perhaps Ed C could elaborate more on this. Thanks, -ed koch From: Horst, Gale
[mailto:ghorst@epri.com] Ed and Rish: Your action items from the energyinteropTC call today:
What are the architectural implications? For exampe
will each end node be linked to receive from one entity above it in the
hierarchy? Or is it acceptable to be able to receive from multiple
senders (REC or entity above) concurrently. We may want to reference the diagram in the proposed
solution to this item. For example Figure 6 in “energyinterop-1.0-spec-wd-12.pdf” line
672 would seem to have an implication. I can see where signals ORIGINATE
from several sources. But will the “Entity A” (REC) be
responsible to sort / prioritize and send the appropriate signal on?
Perhaps other developments or OpenADR has hashed their way through this
issue and can bring some clarity. We may want to check that we have
described the background text in the document to be sure it relays the proper
understanding. THANKS, Gale Gale R. Horst Electric Power Research
Institute (EPRI)
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