A 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 present invention relates to the technical field of power system stability control, and is a power system stabilizer that can ensure that a power system stabilizer (Power System Stabilizer, PSS) has sufficient critical gain during stable control. Background technique [0002] The 38th Research Committee of the International Conference on Large Power Grids organized a special working group (Task Force 38.01.07) to study the problem of low-frequency oscillations in the power grid. The conclusion pointed out that in order to eliminate the threat of oscillations, the power of the main generators in the system should be carefully considered. System stabilizer (PSS); secondly, it should study the parameter setting of the existing HVDC and SVC additional controllers in the system to provide additional damping effects; then consider using FACTS devices such as TCSC Provide smooth damping control; finally, you can consider adding a new device for damping oscilla...

AI Technical Summary

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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