Electric demand control system
AssigneeLeeds & Northrup Company
InventorsFrederick B. Davis, 3rd, Charles W. Ross
Life of this patent
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Abstract
There is disclosed a method and means for continuously controlling the consumption of power by an industrial customer wherein the control is accomplished by controlling the generation of the customer's own power source and/or his load in response to a signal representing the change necessary to make the energy consumed equal the demand limit. The gain of the control response is modified so that it is increased with increases in the difference between the energy actually consumed and the desired consumption.
Claims11
A control system for controlling the consumption of power by a customer over a tie line connected to transfer power between a distribution system and said customer without the consumption exceeding a predetermined energy demand limit during a predetermined demand period, comprising:
- means for determining the power transfer deviation as the change in generation or load required by the customer under existing conditions to make the energy transferred to the customer over the whole demand period correspond to the demand limit;
- means for determining the energy transfer deviation as the deviation between the amount of energy actually transferred during the elapsed portion of the existing demand period and the desired energy transfer for that portion;
- means for controlling said generation or load in response to said power transfer deviation to tend to reduce that deviation toward zero;
- and
- means for modifying the response of said control means in response to a quantity which is a joint function of said energy transfer deviation and the unelapsed time in the demand period.
A control system for controlling the consumption of power by a customer over a tie line connected to transfer power between a distribution system and said customer without the consumption exceeding a predetermined energy demand limit during a predetermined demand period, comprising:
- means for determining the power transfer deviation as the change in generation or load required by the customer under existing conditions to make the energy transferred to the customer over the whole demand period correspond to the demand limit;
- means for determining the energy transfer deviation as the deviation between the amount of energy actually transferred during the elapsed portion of the existing demand period and the desired energy transfer for that portion;
- means for controlling said generation or load in response to said power transfer deviation to tend to reduce that deviation toward zero;
- and
- means for modifying the response of said control means in response to a quantity which is a function of the unelapsed time in the demand period.
A control system for controlling the consumption of power by a customer over a tie line connected to transfer power between a distribution system and said customer without the consumption exceeding a predetermined energy demand limit during a predetermined demand period, comprising:
- means for determining the power transfer deviation as the change in generation or load required by the customer under existing conditions to make the energy transferred to the customer over the whole demand period correspond to the demand limit;
- means for determining the energy transfer deviation as the deviation between the amount of energy actually transferred during the elapsed portion of the existing demand period and the desired energy transfer for that portion;
- means for controlling said generation or load in response to said power transfer deviation to tend to reduce that deviation toward zero;
- and
- means for modifying the response of said control means in response to a quantity which is a function of said energy transfer deviation.
The method for controlling the generation of power by a customer connected through a tie line to transfer power between a distribution system and said customer without the customer's consumption exceeding a predetermined energy demand limit for a predetermined demand period, comprising the steps of:
- determining the power transfer deviation as a change in generation required by the customer under existing conditions to make the energy transferred to the customer over the whole demand period correspond to the demand limit;
- determining the energy transfer deviation as the deviation between the amount of energy actually transferred during the elapsed portion of the existing demand period and the desired energy transfer for that portion;
- controlling said generation in response to said power transfer deviation to tend to reduce said power transfer deviation toward zero;
- and
- modifying said control in response to said energy transfer deviation so as to increase the gain of the control response as said energy transfer deviation increases.
Dependencies are inferred from the claim text.