System for remedying electrical power instability
AssigneeSouthern California Edison Company
InventorsShimo Wang, Anthony Paul Johnson
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Abstract
A system for real-time monitoring of synchrophasors from an electrical power system serving multiple geographic areas can control system instability, without preset parameters or thresholds, detects power flow between the generation sources. If a change in power flow of at least 5% over at time period of 1 second or less occurs and the response to the change in power flow is greater than the change in power flow a signal is generated for corrective action.
Claims20
A method of determining instability in an electrical power system serving at least first and second geographic areas, each geographic area comprising at least one generation source, the method comprising the steps of:
- a) receiving first synchrophasor measurements from a first generation source in the first geographic area;
- b) receiving second synchrophasor measurements from a second generation source in the second geographic area, the second generation source being geographically separated from the first generation source;
- c) comparing the first synchrophasor measurements to the second synchrophasor measurements in a first time period to yield a first comparison measurement and then again in a second time period to yield a second comparison measurement;
- and
- d) transmitting a remedy control command to the first generation source, the second generation source or both the first generation source and the second generation source when a difference between the first and the second synchrophasor comparison indicates an instability.
A method of determining instability in an electrical power system serving at least first and second geographic areas, each geographic area comprising a generation source, the method comprising the steps of:
- a) receiving first synchrophasor measurements from a first generation source in the first geographic area;
- b) receiving second synchrophasor measurements from a second generation source in the second geographic area, the second generation source being geographically separated from the first generation source;
- c) comparing the first synchrophasor measurements to the second synchrophasor measurements in a first time period to yield a first comparison measurement and then again in a second time period to yield a second comparison measurement, the first and second comparison measurements differing by a sufficient amount to indicate an instability in the system;
- and
- d) transmitting a remedy control command to remedy the instability.
A system for controlling an electrical power system serving at least first and second geographic areas, each geographic area comprising a generation source, the system comprising:
- a) one or more transceivers for receiving first synchrophasor measurements from a first generation source in the first geographic area and second synchrophasor measurements from a second generation source in the second geographic area, the second generation source being geographically separated from the first generation source;
- b) a monitor communicatively coupled to the transceivers and configured for comparing an absolute value of the first synchrophasor measurements to the absolute value of the second synchrophasor measurements in a first time period to yield a first comparison measurement and then again in a second time period to yield a second comparison measurement, the first and second time periods differing by at least 1/30 of a second;
- and
- c) an alarm communicatively coupled to the monitor for generating a remedy control command when the first and second comparison measurements differ by a sufficient amount to indicate an instability in the system.
A method of controlling an electrical power system serving two geographic areas, each geographic area having a generation source, the method comprising the steps of:
- a) monitoring power flow between the geographic areas using synchrophasors at a location between the generation sources;
- b) detecting a change in the monitored power flow;
- c) detecting a system response to the change in power flow using synchrophasors;
- d) comparing the change in power flow and the system response;
- and
- e) generating a corrective signal if the system response is greater than the change in the monitored power flow.
A system for controlling an electrical power system serving two geographic areas, each area having a generation source, comprising:
- a) a first generation source;
- b) a second generation source electrically connected to the first generation source;
- c) a power flow detector electrically connected to both the first generation source and the second generation source, the power flow detector being between the generation sources, where the power flow detector is capable of detecting a change in power flow using synchrophasors;
- and
- d) a transmitter communicatively coupled to the first generation source and the second generation source capable of generating a remedy signal for taking corrective action.
A method of controlling an electrical power system serving two geographic areas, each geographic area having a generation source, the method comprising the steps of:
- a) monitoring power flow between the geographic areas using synchrophasors at a location between the generation sources;
- b) detecting a change in the monitored power flow using synchrophasors;
- c) calculating an impact energy and a reverse energy;
- d) comparing the reverse energy and the impact energy;
- and
- e) generating a corrective signal if the reverse energy is greater than impact energy.
Dependencies are inferred from the claim text.