Detection and mitigation of instability of synchronous machines
AssigneeGeneral Electric Company
InventorsTabrez Shakeel, Muhammed Rahim
Life of this patent
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Abstract
Methods and systems for stabilizing a power system include receiving a set point for a power system that includes the compensation circuitry controlled by the control system. A firing angle for the power system is set based at least in part on the set point. An angle between a generator terminal of a generator of the power system and a bus of the power system is calculated. A determination is made whether the angle is within a threshold value of the firing angle. When the angle is not within the threshold value of the firing angle, compensation circuitry is engaged to stabilize the power system.
Claims20
A compensation system, comprising:
- compensation circuitry;
- and
- a control system comprising:
- memory storing instructions;
- and
- one or more processors configured to execute the instructions that are configured to cause the one or more processors to:
- receive a set point for a power system that includes the compensation circuitry controlled by the control system;
- set a firing angle for the power system based at least in part on the set point;
- calculate an angle between a generator terminal of a generator of the power system and a bus of the power system;
- determine whether the angle is within a threshold value of the firing angle;
- and
- when the angle is not within the threshold value of the firing angle, engage the compensation circuitry.
A non-transitory computer-readable medium comprising instructions configured to be executed by one or more processors of a control system, wherein the instructions comprise instructions configured to cause the one or more processors to:
- monitor for indications of a transient event in a power system including a generator configured to generate power that is transferred over a line to a load;
- when indications of transient event are detected, engage compensation circuitry of power system to stabilize the power system during the transient event;
- monitor one or more parameters of the supplied power;
- determine whether the one or more monitored parameters surpass respective thresholds;
- and
- when the one or more monitored parameters surpass the respective thresholds indicative of passage of the transient event, disengage the compensation circuitry.
A method for increasing voltage stability of a power system that includes a generator and compensation circuitry, comprising:
- detect a change in voltage demand by a load of the power system;
- enabling the compensation circuitry to reduce reactive power demand from the generator by engaging the compensation circuitry comprises asserting or deasserting a signal at a gate of a thyristor of a thyristor-controlled series compensation circuitry of the compensation circuitry;
- measuring reactive power of the power system, wherein measuring the reactive power comprises by calculating I2*(XL−XC), wherein I is the current through a line of the power system from the generator to the load, XL is the inductive reactance of the line, and XC is the capacitive reactance of the compensation circuitry;
- based on the measured reactive power, determining whether the power system is in a steady state, wherein determining whether the power system is in the steady state comprises determining whether the reactive power demanded is greater than the reactive power produced by the power system;
- when the power system is determined to be in the steady state, disabling the compensation circuitry;
- and
- when the power system is determined to not be in the steady state, periodically measuring the reactive power and determining whether in a steady state.
Dependencies are inferred from the claim text.