US4136393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of power demand control with time dependent target
Assignee: Westinghouse Electric Corp
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Filing: 1977-07-18
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Granted: 1979-01-23
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Expires: 1997-07-18
Abstract
Abstract The invention relates to power demand control of a number of loads in a plant facility in order to keep the power within a demand limit at the end of a demand period. During the billing period the invention provides for a demand limit floating up and/or down over the demand periods, and means is provided to dampen control action whenever the demand limit would tend to oscillate up and down over the successive demand periods.
Inventors
- 👤 Richard Q. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:16
CPC Classifications
G; G01; G01R; G01R21/00; H; H02; H02J; H02J3/00; H02J3/17; 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: 3
Claim 1
Independent Claim
153 words
A method of limiting the power demand of a plant facility having controllable and non-controllable loads by switching said controllable loads during successive demand periods and selectively in accordance with a pre-established priority list, comprising the steps of: assigning at the beginning of a given demand period a predetermined demand limit to be met at the end of said given demand period; recording the actual demand at the end of said given demand period; assigning for a subsequent demand period a demand limit other than said predetermined demand limit, said other demand limit being equal to said recorded actual demand when said actual demand differs from said predetermined demand limit by a predetermined amount; predicting a demand at the end of any demand period and deriving a demand error by reference to the assigned demand limit with said predicted demand; and switching said controllable loads during the demand period to minimize said error.
Claim 2
Independent Claim
153 words
A method of limiting the power demand of a plant facility having controllable and non-controllable loads by switching said controllable loads during successive demand periods and selectively in accordance with a pre-established priority list, comprising the steps of: assigning at the beginning of a given demand period a predetermined demand limit to be met at the end of said given demand period; recording the actual demand at the end of said given demand period; assigning for a subsequent demand period a demand limit other than said predetermined demand limit, said other demand limit being equal to said recorded actual demand when said actual demand differs from said predetermined demand limit by a predetermined amount; predicting a demand at the end of any demand period and deriving a demand error by reference to the assigned demand limit with said predicted demand; and switching said controllable loads during the demand period to minimize said error.
Claim 3
Dependent Claim
72 words
The method of claim 1, with the further steps of: providing a first signal representative of said predetermined demand limit assigned for said given demand period; storing a second signal representative of the actual demand recorded at the end of said given demand period; and comparing said first and second signals for establishing said other demand limit when said first signal differs from said second signal by at least said minimum amount.
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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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |