Method and device for setting critical gain of power system stabilizer

Abstract

The invention discloses a method and device for setting the critical gain of a power system stabilizer. The method comprises steps of constructing an electromechanical transient model for the single-machine infinite system of a generator to be tested; performing simulation by using electromechanical transient model according to a preset gain step from the preset initial gain of the power system stabilizer of the generator to be tested, so as to obtain the root trajectory of an excitation oscillation mode; according to a preset critical damping ratio threshold, processing the root trajectory ofthe excitation oscillation mode so as to obtain the critical gain of the power system stabilizer; inputting the critical gain of the power system stabilizer to the electromechanical transient model,performing time-domain simulation verification of a terminal voltage step so as to set the critical gain of the power system stabilizer of the generator to be tested. The method can reduce the actually measured error of the critical gain, set the gain value of the power system stabilizer, and further ensures the safe and stable operation of the power system.

Description

technical field [0001] The invention relates to the technical fields of power generation control and power system stability control, in particular to a critical gain setting method and device for a power system stabilizer. Background technique [0002] At present, the power system stabilizer (PSS), which is an additional damping control of the excitation system, is the most widely used, most economical and effective measure to suppress the low-frequency oscillation of the power system in the world. The effect of PSS on suppressing low-frequency oscillation depends on the PSS model and parameters. In terms of PSS parameter setting, according to the phase compensation method, the additional damping torque generated by PSS depends not only on the compensation phase determined by the setting parameters of its lead-lag link, but also on the PSS Gain setting value size. [0003] According to the requirements of relevant guidelines, the current PSS gain setting method mainly adopt...

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Problems solved by technology

However, in the actual on-site PSS critical gain test, due to various disturbances on site, there is a problem of how to judge the occurrence of continuous oscillation

In the actual PSS critical gain measurement work for a long time, for the sake of safety, once the rotor voltage fluctuation is observed in the critical gain test, it is considered to have reached the critical gain, and there is still a huge gap from the real critical gain. The result is quite conservative. The critical gain The test error is extremely large, resulting in the effect of PSS not reaching its intended effect

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