Control method for optimizing the power demand of an industrial plant
First Claim
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1. A method of limiting the power demand of a plant facility having controllable and non-controllable loads by switching said controllable loads during demand periods and selectively in accordance with a pre-established priority list, comprising the steps of:
- assigning at the beginning of each demand period a demand limit to be met at the end of such demand limit;
deriving an indication of the actual demand of power by said plant facility at the end of a demand period;
establishing said demand limit at the beginning of a given demand period by reference to the indication of an actual demand recorded during one demand period preceding such given demand period;
predicting a demand at the end of said given demand;
deriving a demand error by reference to said established demand limit and with said predicted demand; and
switching said controllable loads selectively during said given demand period to minimize said error.
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Abstract
Power demand control in a plant facility is improved by allowing the demand limit imposed as a target to be met at the end of a control period to follow the actual demand in the plant. The demand limit is automatically optimized as actual demand fluctuates and it is set in accordance with past history.
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Citations
4 Claims
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1. A method of limiting the power demand of a plant facility having controllable and non-controllable loads by switching said controllable loads during demand periods and selectively in accordance with a pre-established priority list, comprising the steps of:
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assigning at the beginning of each demand period a demand limit to be met at the end of such demand limit; deriving an indication of the actual demand of power by said plant facility at the end of a demand period; establishing said demand limit at the beginning of a given demand period by reference to the indication of an actual demand recorded during one demand period preceding such given demand period; predicting a demand at the end of said given demand; deriving a demand error by reference to said established demand limit and with said predicted demand; and switching said controllable loads selectively during said given demand period to minimize said error. - View Dependent Claims (2, 3, 4)
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Specification