US4141069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time dependent power demand control method
Assignee: Westinghouse Electric Corp
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Filing: 1977-08-26
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Granted: 1979-02-20
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Expires: 1997-08-26
Abstract
Abstract A power demand control method uses a temporary demand limit in excess of the demand limit assigned as a target at the end of the demand period, and such temporary demand limit is reduced by steps from control point to control point until it coincides with the assigned target at the very end of the demand period. More specifically, the demand limit used for prediction is reduced by a major portion always the same from predicted demand error to the reset, thereby progressively reducing the same down to zero at the end of the period.
Inventors
- 👤 Richard Q. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:01
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; H02J3/14; H02J2105/00; H02J2105/50; H02J2105/52; H02J2105/57; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
A method of controlling a plurality of interruptible loads in an industrial plant supplied with power from a utility power company in order to hold the demand at the end of a demand period to a predetermined demand limit; comprising the steps of: establishing at successive time intervals within the demand period respective pseudo-demand-limits to be reached at the end of the demand period; deriving at selected instant during the demand period an indication of power consumption of said loads; predicting in relation to the indication received at a corresponding one of said instants a demand at the end of the demand period; comparing the predicted demand and the pseudo-limit for a corresponding one of said successive time intervals for providing a demand error relative to such pseudo-demand-limit; selecting a suitable amount of power with said loads to minimize said demand error with said corresponding time interval; the said comparing step being performed following a preceding one of said time intervals for providing a residual demand error relative to said predetermined demand limit; and said selecting step being accomplished so as to minimize said residual error before the end of the demand period.
Claim 2
Independent Claim
193 words
A method of controlling a plurality of interruptible loads in an industrial plant supplied with power from a utility power company in order to hold the demand at the end of a demand period to a predetermined demand limit; comprising the steps of: establishing at successive time intervals within the demand period respective pseudo-demand-limits to be reached at the end of the demand period; deriving at selected instant during the demand period an indication of power consumption of said loads; predicting in relation to the indication received at a corresponding one of said instants a demand at the end of the demand period; comparing the predicted demand and the pseudo-limit for a corresponding one of said successive time intervals for providing a demand error relative to such pseudo-demand-limit; selecting a suitable amount of power with said loads to minimize said demand error with said corresponding time interval; the said comparing step being performed following a preceding one of said time intervals for providing a residual demand error relative to said predetermined demand limit; and said selecting step being accomplished so as to minimize said residual error before the end of the demand period.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |