Power system stabilizer

Abstract

The invention discloses a power system stabilizer comprising an adder, a critical gain boost module, a measuring module, a gain module, a first DC (direct current) blocking module, a phase compensating module and a first output amplitude-limiting module. The measuring module, the gain module, the first DC blocking module, the phase compensating module and the first output amplitude-limiting module are connected in sequence. The input end of the critical gain boost module is connected to the second input end of the adder; the first input end of the adder is connected to the output end of the first output amplitude-limiting module. The critical gain boost module is used for boosting phase characteristic of the power system stabilizer of 3Hz-20Hz frequency and outputting a second voltage control signal. The adder is used for adding a first voltage control signal outputted by the first output amplitude-limiting module and the second voltage control signal and outputting a voltage control signal. The power system stabilizer has the advantages that low-frequency oscillation and excitation-mode oscillation can be suppressed at the same time, gain margin is increased, the stabilizer is structurally simple and reliable, and stability control level for a power system is increased.

Description

technical field [0001] The invention relates to the technical field of power system stability control, and relates to a power system stabilizer capable of ensuring that a power system stabilizer (Power System Stabilizer, PSS) has sufficient critical gain during stability control. Background technique [0002] The 38th Research Committee of the International Large Power Grid Conference once organized a special working group (Task Force38.01.07) to study the low-frequency oscillation problem of the power grid. System stabilizer (PSS); secondly, the parameter setting of the additional controller of the existing HVDC and static var compensator (SVC) in the system should be studied to provide additional damping effect; then consider using FACTS devices such as TCSC Provides smooth damping control; finally consider adding a new device to the system entirely for damping oscillations. [0003] With the development of control theory and intelligent algorithms, there has been a lot o...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the object of the present invention is to provide a power system stabilizer, aiming to solve the problem of insufficient critical gain of the existing power system stabilizer when performing low-frequency oscillation control

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