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Subject: Re: [emix] Ramp intervals

Although these profiles do exist "in the wild", they are sequestered from the polite world by controls systems.  The latter are designed to prevent the release of power onto the grid until a) it achieves the required harmonization characteristics; and b) it has achieved stability doing so.  Generators typically will start their units using the connected grid as a reference signal for those controls.

The analogous signaling strategy, I think, involved registering the asset in such a way that the respective control center knows the ramp up/down commitment time for that asset (e.g., 30 minute, 10 minute, etc).  Because this is part of the registration process, having an instruction within EMIX might be both redundant and confusing.


Phil Davis | Senior Manager - Solutions | Schneider Electric Demand Response Resource Center | 3103 Medlock Bridge Road, Suite 100 | Norcross, GA  30071 | 404..567.6090 | phil.davis@us.schneider-electric.com | www.schneider-electric.com | Skype: pddcoo

On Tue, Sep 14, 2010 at 2:19 PM, Toby Considine <Toby.Considine@gmail.com> wrote:

Do we need a construction within EMIX for ramping intervals? I am tieing this to such things as the 3-part generation bids

Consider the case of a long generation cycle followed by a discrete ramp cycle. The whole shape is the electricity produced. Things don’t just shut down, there is some electricity that needs to go somewhere, and if it goes onto the grid, it must be planned for and balanced.


The large rectangle on the left is the scheduled generation period. The it may be scheduled for three hours, it may be scheduled for 1, it may be scheduled for 16. The slopey bit on the right  just comes along for the ride.

The shape above is an ugly interval.We could solve it by making an infinite number of intervals, or at least enough so that we can assume that each one was flat. I think it would be an error to recreate intro calculus within EMIX…

WS-Calendar supports separating a scenario like that above, in which the things are split into two linked intervals. It is easy to schedule the interval on the left, to any length, It is the supply of a constant amount of energy for a variable period of time, as per contract. The funny looking shape on the right, comes along for the ride; buying the left is buying the right. This occurs in many scnarios in homes / buildings / energy / …

So in Emix, we have a product, and then we have a ramp. The ramp is a predictable varying, but constant duration (probably) delivery of product. There may be ramp ups and ramp downs.


We need to include handling of ramped energy in each EMX product.



“It is difficult to get a man to understand something, when his salary depends upon his not understanding it” -- Upton Sinclair.

Toby Considine
TC9, Inc

OASIS Technical Advisory Board
TC Chair: oBIX & WS-Calendar

TC Editor: EMIX, EnergyInterop

U.S. National Inst. of Standards and Tech. Smart Grid Architecture Committee


Email: Toby.Considine@gmail.com
Phone: (919)619-2104

blog: www.NewDaedalus.com



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