US3913829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Economic dispatch technique for interconnected power systems
Assignee: Individual
•
Filing: 1974-05-29
•
Granted: 1975-10-21
•
Expires: 1994-05-29
Abstract
Abstract A control system for computing economic dispatch signals for each operating area within an interconnected power system, utilizing an algorithm for solving the interarea coordination equations resulting in the definition of a common reference running cost for the interconnection, and enabling the explicit solving of the individual operating area running costs, thus avoiding any need for an iterative solution. The computational burden is shared between a system computer which makes periodic power and/or running cost assignments for each operating area, and operating area computers which independently calculate specific dispatch signals for the generators within their areas.
Inventors
- 👤 Lester H Fink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:13
CPC Classifications
G; G06; G06Q; G06Q50/00; G06Q50/06; G06Q10/00; G06Q10/06
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
145 words
An interconnected power system comprising: a. a plurality of subsystems each having a plurality of power generation units coordinated by a local generation coordination control system for developing generating requirements for said units in response to subsystem generating requirements, said subsystems being interconnected to transmit power among each other; b. system digital computer means having a stored program for performing, at least at the rate of significant change of subsystem generating conditions, the function of explicitly calculating, for each of said subsystems, a subsystem dispatch signal as a function of power flow within each such subsystem, and c. transmission means for coupling, at least at said rate, status information from said local generation control systems to said system computer means, and for coupling, at least at said rate, corresponding subsystem dispatch signals back to control and to coordinate the operation of said power generation units.
Claim 2
Dependent Claim
145 words
An interconnected power system comprising: a. a plurality of subsystems each having a plurality of power generation units coordinated by a local generation coordination control system for developing generating requirements for said units in response to subsystem generating requirements, said subsystems being interconnected to transmit power among each other; b. system digital computer means having a stored program for performing, at least at the rate of significant change of subsystem generating conditions, the function of explicitly calculating, for each of said subsystems, a subsystem dispatch signal as a function of power flow within each such subsystem, and c. transmission means for coupling, at least at said rate, status information from said local generation control systems to said system computer means, and for coupling, at least at said rate, corresponding subsystem dispatch signals back to control and to coordinate the operation of said power generation units.
Claim 3
Dependent Claim
139 words
An interconnected power system comprising: a. a plurality of subsystems, each including a plurality of power generating units, said subsystems being interconnected to transmit power among one another; b. means for sampling current load and tie line flow, for each of said subsystems, at a frequency at least as great as the rate of significant change of said current load and tie line flow quantities; c. means, responsive to said means for sampling, for explicitly developing for each of said subsystems, at least at said frequency, a subsystem dispatch requirement; d. a plurality of subsystem control means, corresponding respectively to said subsystems, for developing power generating requirements for the units of the associated subsystem; and e. means for coupling dispatch requirements from said means for developing, at said frequency, the subsystem dispatch requirements to the corresponding subsystem control means.
Claim 4
Dependent Claim
139 words
An interconnected power system comprising: a. a plurality of subsystems, each including a plurality of power generating units, said subsystems being interconnected to transmit power among one another; b. means for sampling current load and tie line flow, for each of said subsystems, at a frequency at least as great as the rate of significant change of said current load and tie line flow quantities; c. means, responsive to said means for sampling, for explicitly developing for each of said subsystems, at least at said frequency, a subsystem dispatch requirement; d. a plurality of subsystem control means, corresponding respectively to said subsystems, for developing power generating requirements for the units of the associated subsystem; and e. means for coupling dispatch requirements from said means for developing, at said frequency, the subsystem dispatch requirements to the corresponding subsystem control means.
Claim 5
Dependent Claim
38 words
principal control means, responsive to the subsystem level conditions from said means for sampling, for explicitly developing, for each of said subsystems, a subsystem dispatch requirement at a rate as least as frequent as substantial system conditions change,
Claim 6
Dependent Claim
38 words
principal control means, responsive to the subsystem level conditions from said means for sampling, for explicitly developing, for each of said subsystems, a subsystem dispatch requirement at a rate as least as frequent as substantial system conditions change,
Claim 7
Dependent Claim
14 words
calculating as a function of said participation factors, compensation factors for each said subsystem;
Claim 8
Dependent Claim
14 words
calculating as a function of said participation factors, compensation factors for each said subsystem;
Claim 9
Dependent Claim
34 words
An interconnected power system comprising: a. a plurality of subsystems, each including a plurality of power generating units, said subsystems being interconnected to transmit power among one another; and b. system control means including:
Claim 10
Dependent Claim
34 words
An interconnected power system comprising: a. a plurality of subsystems, each including a plurality of power generating units, said subsystems being interconnected to transmit power among one another; and b. system control means including:
Claim 11
Dependent Claim
24 words
a plurality of subsystem control means, corresponding respectively to said subsystems, for developing power generating requirements for the units in the associated subsystem, and
Claim 12
Dependent Claim
24 words
a plurality of subsystem control means, corresponding respectively to said subsystems, for developing power generating requirements for the units in the associated subsystem, and
Claim 13
Dependent Claim
29 words
adjusting the incremental cost curve of each such subsystem by its respective compensation factor, and summing said adjusted incremental cost curves to obtain an effective system incremental cost curve;
Claim 14
Dependent Claim
29 words
adjusting the incremental cost curve of each such subsystem by its respective compensation factor, and summing said adjusted incremental cost curves to obtain an effective system incremental cost curve;
Claim 15
Dependent Claim
34 words
The system as described in claim 1, wherein said computer means performs said function subject to the constraint that the incremental costs of tie flow at the boundaries of each such subsystem are equal.
Claim 16
Dependent Claim
21 words
means for coupling dispatch requirements from said principal control means to the corresponding subsystem control means at at least said rate.
Claim 17
Dependent Claim
21 words
means for coupling dispatch requirements from said principal control means to the corresponding subsystem control means at at least said rate.
Claim 18
Dependent Claim
16 words
determining the system incremental cost from said effective cost curve for the current system load; and
Claim 19
Dependent Claim
16 words
determining the system incremental cost from said effective cost curve for the current system load; and
Claim 20
Dependent Claim
47 words
for at least one of said subsystems, determining a generation assignment signal on the basis of the system incremental cost and the adjusted cost curve of such subsystem, said generation assignment signal being a form of economic dispatch signal suitable for regulating the generation of said subsystem.
Claim 21
Dependent Claim
47 words
for at least one of said subsystems, determining a generation assignment signal on the basis of the system incremental cost and the adjusted cost curve of such subsystem, said generation assignment signal being a form of economic dispatch signal suitable for regulating the generation of said subsystem.
Claim 22
Dependent Claim
33 words
The system as described in claim 4, comprising control means in communication with said computer means, for controlling power generation units within each said subsystem as a function of said subsystem dispatch signals.
Claim 23
Dependent Claim
41 words
A system as described in claim 2 wherein said means for explicitly developing comprises computer means for developing a subsystem dispatch requirement subject to the constraint that the incremental cost of tie flow at the boundaries of each subsystem are equal.
Claim 24
Dependent Claim
26 words
A system as described in claim 3 wherein said principal control means comprises system digital computer means having a stored program for performing the functions of:
Claim 25
Dependent Claim
46 words
The system as described in claim 7, wherein said computer means performs, for a second one of said subsystem, the function of dividing said system incremental cost by the calculated compensation factor of such second subsystem to determine an incremental cost signal for said second subsystem.
Claim 26
Dependent Claim
28 words
The system as described in claim 7 wherein the compensation factor (C.F.) for an operating area (i) having N tie lines connected thereto is defined by the relation
Claim 27
Dependent Claim
12 words
The system as described in claim 9, wherein said participation factors are
References Cited (Backward Citations)
US3124699A
Cited
US3117221A
Cited
US3229110A
Cited
US3270209A
Cited
US3400258A
Cited
US3683161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |