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Subject: Discovery in Smart Grid applications
Toby, Francois ( or any member of the committee) I’m working on the smart grid standard Energy Interoperation (and its profiled twin OpenADR). The normal mode in which this operates is that a [home, commercial building] is a Resource. A Resource may choose to respond to economic signals from the grid and use less energy. Service / Results / end of story. We call this the Energy Services Interface (ESI). A complicating factor is that in many parts of the country, pure economic signals are not allowed. In these, to get rewards, there must be some level of not-quite-direct control of Devices inside a Resource. We call these Assets. Think of an Asset as a virtual device that’s a good place to start. An Asset may be a toaster, a water heater, or an entire production line in a factory. What matters is that a contract allows it to be exposed and its function “directly” monitored. A potentially interesting spin on Assets is Distributed Energy Resources (DER). A home solar panel, or a roof-top wind turbine, or a grid integrated thermal storage system might all be Assets. In any case, Assets need only a constrained set of interactions (On, off, half speed, set thermostat to 76, is it running now, charge up, discharge, how much electricity is it generating now). Limited metadata is expected as well, largely to let Transmission operators deal with covarying Assets. 500 solar panels on the south side of town might be covarying Assets as the same clouds might take them all out at the same time. Today, of course, Assets are covered by Tariffs, and this is all closely regulated. In the future, Assets may be offered to the market as tenders, contracted, and exposed. I am considering how I would incorporate WS-DD and WS-DP into the ESI. The model is the secure proxy discovery of remote devices already incorporated into WS-DD, i.e., the ESI can choose which Assets to expose, and when to expose them. The ESI would them “take Assets off line” when they are not available for “direct” interaction. In this case, Direct is still mediated application exposing the ESI. I think there are a limited number of profiles (less than 10) to define all possible Assets. An essential part of the profile is the potential Energy effects of the Asset. (Can respond in 10 minutes, and free up 15 KW of power, but cannot be called upon for more than 3 consecutive hours). These Energy Profiles are already largely defined within the EMIX work on Energy Market Resources. There is similar work going on inside ASHRAE SPC 201, discussing the energy information that would be exposed by Systems in Industrial Sites, Commercial Buildings, and Homes. If we can make this work for Energy Interoperation, we can imagine a [home] energy manager that discovers the energy profiles of all systems in the house. Some of those Assets are later exposed for secure remote access. I guess this all assumes that Devices might have more than one service, say an Operation Service, as a Printer exposes to me, or an Energy Service, which exposes how it uses Energy. Toby, can you, or any member of the committee, spare me some time to discuss how this might work, and give me pointers into approaching the WS-DD work for this purpose. (Of course, I may be talking DPWS). Thanks in advance tc "If something is not worth doing, it`s not worth doing well"
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