Method and apparatus for power plant dynamic var regulation and transient stability improvement

摘要

Method and apparatus for controlling at least one generator and a Static Var Compensator (SVC) to improve dynamic performance of the power plant are provided. The method comprises: obtaining the required input parameters for control of said generators and SVC; determining a control mode of the generators and the SVC; calculating the control references based on the input parameters and the control mode of the generators and the SVC; and controlling the generators and/or the SVC according to the control references. The invention also relates to a corresponding apparatus which can implement the method of the invention.

主权项

1. A method for controlling at least one generator and a Static Var Compensator (SVC) to improve dynamic performance of a power plant, the method comprising:
obtaining one or more required input parameters for control of said at least one generator and the SVC; determining a control mode of the at least one generator and the SVC; calculating one or more control references based on the one or more required input parameters and the control mode of the at least one generator and the SVC; and controlling the at least one generator and/or the SVC according to the one or more control references; a first control mode to realize a unity power factor operation of multiple generator units with different operating points; a second control mode for regulating a power plant dynamic reactive power without undesired internal reactive power consumption; and a third control mode for improving a transient stability of the power plant under system disturbances; wherein the first control mode comprises: using said SVC to control a high side voltage of a unit transformer according to a high side voltage reference from high level control centers of a power system; calculating a feed forward component for terminal voltage references of different generator units based on a same high side voltage reference for SVC; calculating feedback components for terminal voltage references of different generator units based on a closed-loop control to remove potential measurement errors or parameter errors; and using excitation systems of said at least one generator to control the terminal voltage of the generator units according to the terminal voltage references.