Method and device for setting critical gain of power system stabilizer

A power system, critical gain technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems that the effect does not achieve its due effect, the critical gain test error is large, etc., to improve the dynamic stability and temporary stability level, ensure the suppression effect, The effect of reducing errors
CN109802403AActive Publication Date: 2019-05-24ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
Publication Date
2019-05-24

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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.
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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...

Claims

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