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Subject: Observations from the Appliance workshop
All, I attended the EPRI “DR-Ready Appliance Workshop”
yesterday in Knoxville, and the discussion ranged around appliance
communications and action for demand response. Basic agreement on what “smart grid ready”
means: ·
Can shed ·
Can shift ·
Can communicate ·
Can understand SEP (or, as I observed, some
standard data syntax and semantics and transport)—EPRI and U-SNAP are
pushing for a standard connector that would allow plugging in an external comms
chip. But you still need the app layer. ·
Security Other observations: ·
Of course, how you accomplish the above for
specific device classes (in different regions, see below) might need some definition
when it comes time to do compliance testing. And what kind of signal are you
going to feed an appliance to prove it can shed/shift, and how much? Maybe you
need a standard forward price curve representative of different kinds of
typical peaks. Maybe you need a standard forward mode signal, similar to what
the DRAS feeds to the Simple Client in OpenADR. ·
Another model that was advocated (not by the
appliance manufacturers nor by me) is having more/most of the intelligence at
some EMS and passing a simpler signal to the appliance. To me, this requires
communications from the appliance to the EMS (at least a standard energy profile)
plus it requires a standard EMS. ·
I realized that there are perhaps limits on how
universal appliances can be. DR programs have very real differences in
different utility territories due to very real weather and regulatory
differences. AC is all that matters in Phoenix (besides turning off pool pumps)—hot
water is not an issue because water comes into the house hot. That won’t
be the case in some other places. This came up relative to the question of whether
appliance loads really matter. But a dryer and oven draw more power than the
AC. And a refrigerator only draws 70W on average, but I have 3 and they run
24/7. So, how much does the regionality issue affect energy management
algorithms for appliances? A rep from Daikin says they ship products that can
go anywhere, just need the right software update to get tuned control
algorithms. ·
Appliance manufacturers want to hear what it is
worth to the grid. I can give you 5kW for 15 min, 2kW for an hour, 1 kW for 8
hours. What’s it worth to you? The appliance manufacturers haven’t
gotten this data yet. David Holmberg NIST Building and Fire Research Lab 301-975-6450 |
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