US4110825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control method for optimizing the power demand of an industrial plant
Assignee: Westinghouse Electric Corp
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Filing: 1977-04-28
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Granted: 1978-08-29
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Expires: 1997-04-28
Abstract
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.
Inventors
- 👤 Richard Q. Fox
- 👤 Donald E. Sigut
- 👤 John H. McWhirter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:44
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/003; H02J3/17; H02J2105/00; H02J2105/50; H02J2105/52; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y02P; Y02P80/00; Y02P80/10; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
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.
Claim 2
Independent Claim
150 words
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.
Claim 3
Dependent Claim
61 words
The method of claim 1 further including: providing a first signal representative of the actual power demand recorded for a demand period immediately preceding said given demand period; comparing said first and second signals for establishing a new demand limit for said given demand period in relation to said first signal when said first signal is larger than said second signal.
Claim 4
Dependent Claim
41 words
The method of claim 2 including further the step of data logging actual demands recorded during successive demand periods, said recorded actual demands being used to provide said first signal and the logged data being used to provide said second signal.
Claim 5
Dependent Claim
18 words
The method of claim 2 with said assigned demand limit being updated from demand period to 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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |