励磁系统控制模型的辨识测试

Identification Experiments on Excitation Control System Models

介绍了励磁系统采用的PID+PSS2A控制中隔直、惯性以及超前滞后等环节的辨识方法。测试使用频谱仪扫描经过被测环节的白噪声信号的频谱变化,去除A/D-D/A环节影响后,对比得到的频谱特性是否与理论一致,以验证此环节软件实现的正确性。给出了在广西大化电厂得到的测试结果,以及获取发电机无补偿特性的试验方法和补偿结果。

This paper introduces identification methods for transfer functions of excitation control system models. The transfer functions include washout, lead-lag filter, high-pass filter and low-pass filter element, etc. White noise is sampled as input of the transfer function being tested, and a spectrum analyzer is used to analyze the output signals of the transfer function. The validty of the transfer function implemented in software is verified by comparing the consistency of the tested magnitude- frequency and phase-frequency characteristics of the signal with the theoretical results. Experimental results obtained from Dahua Hydro Power Plant located at Guangxi power grid are given, and the ways to obtain the phase-frequency characteristic of generator without PSS and corresponding results are also introduced.