Electric power generator selection, shedding, and runback for power system stability
First Claim
1. A system for managing an electric power delivery system, comprising:
- a communications interface to receive signals from the electric power delivery system and to send signals to modify generation of electric power of a plurality of generators;
one or more processors to;
determine a plurality of generator groups, each generator group comprising a unique set of one or more of the plurality of generators;
determine excess generation (EG) by the electric power delivery system, based on load information from a signal from the electric power delivery system;
if EG is less than or equal to runback capacity (RC) of the plurality of generators;
select a generator group of the plurality of generator groups according to a predetermined ordering; and
until EG is greater than a runback selected (RS), where RS is a sum of a runback capacity of a group (RCg) for selected groups;
select a next generator group of the plurality of generator groups according to the predetermined ordering; and
set RS equal to itself plus the RCg for the next selected generator group;
if EG is less than or equal to RS;
set a runback set point for each generator of the selected generator group; and
send a signal by the communications interface to runback each generator of the selected generator group according to the runback set point.
1 Assignment
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Accused Products
Abstract
The present disclosure provides systems and methods for managing an electric power delivery system. The systems and methods may limit generated power of the power delivery system from surpassing a load demand, in order to avoid system instability. The systems and methods may receive an excess generation value and manage generators to runback and/or shed to maintain excess generation below a threshold. The systems and methods may determine a plurality of generator groups for runback. The runback capacity of the generators may be compared against the excess generation. If the excess generation is not greater than the runback capacity, the systems and methods may select generator groups until the runback capacity of the selected groups is greater than the excess generation, and may runback those generators according to runback set points. The unselected generators may continue normal operation to be available for another runback request.
115 Citations
23 Claims
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1. A system for managing an electric power delivery system, comprising:
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a communications interface to receive signals from the electric power delivery system and to send signals to modify generation of electric power of a plurality of generators; one or more processors to; determine a plurality of generator groups, each generator group comprising a unique set of one or more of the plurality of generators; determine excess generation (EG) by the electric power delivery system, based on load information from a signal from the electric power delivery system; if EG is less than or equal to runback capacity (RC) of the plurality of generators; select a generator group of the plurality of generator groups according to a predetermined ordering; and until EG is greater than a runback selected (RS), where RS is a sum of a runback capacity of a group (RCg) for selected groups; select a next generator group of the plurality of generator groups according to the predetermined ordering; and set RS equal to itself plus the RCg for the next selected generator group; if EG is less than or equal to RS; set a runback set point for each generator of the selected generator group; and send a signal by the communications interface to runback each generator of the selected generator group according to the runback set point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for managing an electric power delivery system comprising a plurality of generators, the method comprising:
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determining a plurality of generator groups, each generator group comprising a unique set of one or more of the plurality of generators; determining excess generation (EG) by the electric power delivery system, based on load information received through a signal from the electric power delivery system; if EG is less than or equal to runback capacity (RC) of the plurality of generators; selecting a generator group of the plurality of generator groups according to a predetermined ordering; and until EG is greater than a runback selected (RS), where RS is a sum of a runback capacity of a group (RCg) for selected groups; selecting a next generator group of the plurality of generator groups according to the predetermined ordering; and setting RS equal to itself plus the RCg for the next selected generator group; if EG is less than or equal to RS; setting a runback set point for each generator of the selected generator group according to a proportion of RC within the generator; and sending a signal by a communication interface to runback each generator of the selected generator group according to the runback set point. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system for managing generation runback on a microgrid, comprising:
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a contingency breaker to receive an over-generation condition signal indicating that the microgrid is generating excess power beyond power being consumed collectively by loads connected to the microgrid, wherein the contingency breaker trips based on user preferences and the over-generation condition signal; an intelligent electronic device (IED) in communication with the contingency breaker and a plurality of generators on the microgrid, the IED to; determine a plurality of generator groups, each generator group comprising a unique set of one or more of the plurality of generators; calculate excess generation (EG) on the microgrid; if EG is less than or equal to a runback capacity (RC) of the plurality of generators; select a generator group of the plurality of generator groups; and until EG is greater than a runback selected (RS), where RS is a sum of a runback capacity of a group (RCg) for selected groups; select a next generator group of the plurality of generator groups according to a predetermined ordering; and set RS equal to itself plus the RCg for the next selected generator group; if EG is less than or equal to RS; set a runback set point for each generator of the selected generator group according to a proportion of RC within the generator; and send a signal by a communication interface to runback each generator of the selected generator group according to the runback set point. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification