Economic dispatch technique for interconnected power systems

• US 3,913,829 A
• Filed: 05/29/1974
• Issued: 10/21/1975
• Est. Priority Date: 09/28/1972
• Status: Expired due to Term

• Current Assignee: Lester H. Fink
• Original Assignee: Lester H. Fink
• Inventors: Fink, Lester H.
• Primary Examiner(s): Ruggiero, Joseph F.
• Application Number:
  US05/474,262
• Time in Patent Office: 510 Days
• Field of Search: 235/151.21 444/1 307/57,29,31-35
• US Class Current: 705/412
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: G06Q 50/06 Energy or water supply

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.

Claims

1. 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.

2. calculating as a function of said participation factors, compensation factors for each said subsystem;

3. 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;

4. determining the system incremental cost from said effective cost curve for the current system load;

and

5. 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.

6. 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.

7. 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:

8. 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.

9. 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

10. The system as described in claim 9, wherein said participation factors are