应用开环补偿原理整定PSS参数的准确性分析

通过开环条件和闭环条件的对比,研究了应用开环补偿原理进行PSS参数整定方法的准确性。首先通过简化得到单一电功率输入信号的PSS模型。应用开环补偿理论分析方式研究了控制参数变化对幅频特性、相频特性的影响。然后采用实际电网仿真方式,闭环条件下研究了参数变化对临界增益和阻尼效果的影响。通过对比开环和闭环的结果,发现了开环补偿理论不能精确分析PSS阻尼效果。分析结果表明PSS参数整定需考虑幅频特性、相频特性协调配合。仿真结果发现了隔直环节参数对临界增益参数、阻尼效果存在影响,临界增益未受幅频增益最大值影响。最后通过对比分析,给出了参数整定工作的改进建议。该成果对于PSS参数的优化配置具有参考价值。

Accuracy analysis of using the open-loop compensation principle for PSS parameter setting

By comparing the open-loop condition and closed-loop condition, the accuracy of PSS parameter setting method using open-loop compensation principle is studied. Firstly, the PSS model which has one single electric power input signal is acquired by simplification. The influence of control parameters on amplitude-frequency characteristics and phase-frequency characteristics is studied by using open-loop compensation theory. Then the influence of parameter variation on critical gain and damping effect is studied under closed-loop condition by means of real power grid simulation. By comparing the open-loop condition and closed-loop condition results, it is found that the open-loop compensation theory cannot accurately analyze the PSS damping effect. The results show that the coordination of amplitude-frequency and phase-frequency characteristics is needed in PSS parameter setting. The simulation results show that the critical gain and damping effect is influenced by the parameters of the DC block link, and the critical gain is not affected by the maximum amplitude-frequency gain. Finally, some suggestions for improving parameter setting are given through comparative analysis, the achievements obtained in this paper can be used as a reference for the optimal configuration of PSS parameters. This work is supported by National Natural Science Foundation of China (No. 51777074 and No. 51307058), the Chinese Fundamental Research Funds for the Central Universities (No. 2018YQ03), and the Hebei Provincial Top Youth Talent Support Program (No. 2018]-27).