US3872286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system and method for limiting power demand of an industrial plant
Assignee: Westinghouse Electric Corp
•
Filing: 1973-10-12
•
Granted: 1975-03-18
•
Expires: 1993-10-12
Abstract
Abstract The invention relates in general to control of the consumption of energy derived by an industrial user from a power supply system (electrical, gas or like commodity), and more particularly to a control system for adjusting an industrial load system to limit the demand of power while respecting the constraints of the load system.
Inventors
- 👤 Richard E J Putman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; H02J3/14; G; G06; G06Q; G06Q50/00; G06Q50/06; H02J2105/00; H02J2105/50; H02J2105/52; H02J2105/54; H02J2105/55; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y02P; Y02P80/00; Y02P80/10; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222; Y04S50/00; Y04S50/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
325 words
In a control system for holding to a demand limit at the end of a billing period the power demand of an industrial plant having a plurality of interruptible loads, including means for providing an indication of power consumption of said loads during a billing period; means responsive to said means for providing an indication of power consumption for predicting a demand at the end of said billing period; means responsive to said demand predicting means for providing a demand error relative to said demand limit; means for selecting a suitable amount of power; comparator means responsive to said demand error providing means and to said power selecting means for establishing a residual error relative to said demand limit; and means responsive to the output of said comparator means for load control; the combination of: means for setting switching constraints to at least part of said loads thereby to define among said interruptible loads and at times during said billing period, loads of controllable status and loads of non-controllable status; said load control means including means for switching a load of a switchable amount of power in response to the sign of the output of said comparator means; means for indicating the switching status of said loads at anytime during said billing period; said power selecting means including priority means operative with a priority list of loads of controllable status and in accordance with the output of said switching status indicating means; said power selecting means being operative in response to said residual error during successive decision periods within said billing period to provide a switchable amount of power from said priority list; said switching means being operative in response to said power selecting means during such said decision period and operative in response to said constraint setting means before such said decision period; and, wherein said demand predicting means is responsive to operation of said constraint setting means before any such said decision period.
Claim 2
Dependent Claim
325 words
In a control system for holding to a demand limit at the end of a billing period the power demand of an industrial plant having a plurality of interruptible loads, including means for providing an indication of power consumption of said loads during a billing period; means responsive to said means for providing an indication of power consumption for predicting a demand at the end of said billing period; means responsive to said demand predicting means for providing a demand error relative to said demand limit; means for selecting a suitable amount of power; comparator means responsive to said demand error providing means and to said power selecting means for establishing a residual error relative to said demand limit; and means responsive to the output of said comparator means for load control; the combination of: means for setting switching constraints to at least part of said loads thereby to define among said interruptible loads and at times during said billing period, loads of controllable status and loads of non-controllable status; said load control means including means for switching a load of a switchable amount of power in response to the sign of the output of said comparator means; means for indicating the switching status of said loads at anytime during said billing period; said power selecting means including priority means operative with a priority list of loads of controllable status and in accordance with the output of said switching status indicating means; said power selecting means being operative in response to said residual error during successive decision periods within said billing period to provide a switchable amount of power from said priority list; said switching means being operative in response to said power selecting means during such said decision period and operative in response to said constraint setting means before such said decision period; and, wherein said demand predicting means is responsive to operation of said constraint setting means before any such said decision period.
Claim 3
Dependent Claim
102 words
The control system of claim 1 with means for establishing said residual error relative to a biased said demand limit, said comparator means being selectively operable relative to said demand limit and to said biased demand limit; wherein said comparator means and said switching means are operated relative to said biased demand limit during a first period within said billing period and wherein a predetermined priority load is selected by said priority means during a second period following said first period; with said comparator means and said switching means being operated relative to the unbiased said demand limit during said second period.
Claim 4
Dependent Claim
65 words
The control system of claim 1 with means for preventing operation of said switching means during an initial period of said billing period; with means for establishing a bias to said demand limit during an inteRmediary period following said initial period; and with means for reducing said bias progressively to zero during a final period following said intermediary period and ending with said billing period.
References Cited (Backward Citations)
US3296452A
Cited
US3505508A
Cited
US3522421A
Cited
US3602703A
Cited
US3659114A
Cited
US3719809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |