抛载试验和数值差分在发电机参数辨识中的应用  

Application of Load Rejection Test and Numerical Difference in Identification of Generator Parameter

作　　者：夏潮 肖洋 李志强 柏峰 马晓光 胡建勇 XIA Chao;XIAO Yang;LI Zhiqiang;BAI Feng;MA Xiaoguang;HU Jianyong(China Electric Power Research Institute,Haidian District,Beijing 100192,China;State Grid Jibei Electric Power Co.,Ltd.,Maintenance Branch,Fangshan District,Beijing 102488,China)

机构地区：[1]中国电力科学研究院有限公司,北京市海淀区100192 [2]国网冀北电力有限公司检修分公司,北京市房山区102488

出　　处：《电网技术》2021年第4期1553-1558,共6页Power System Technology

基　　金：国家电网公司总部科技项目“新型分布式调相机关键技术研究与涉网性能评估”(SGSDDK00SPJS1900088)。

摘　　要：为解决抛载法用于自并励发电机参数辨识时因励磁电压变化导致的辨识不准确问题,提出了基于抛载试验和数值差分的发电机参数辨识方法。该方法采用抛载试验和时域辨识法相结合的方式开展参数辨识;同时,为形成参数迭代过程中的雅克比矩阵,利用数值差分的方法计算机端电压对各参数的轨迹灵敏度,较好地解决了抛载时刻轨迹灵敏度的初值问题。由于抛载试验电气量可观测性强,该方法能较好地克服环境噪声的干扰;同时,时域辨识法理论严密,能充分计及自并励机组抛载后励磁电压变化对辨识结果的影响。辨识实例表明该方法简单易行,具有较强的工程实用价值。In order to solve the inaccurate identification problem when the load rejection method is used in the self-excited generators due to the excitation voltage variation, a parameter identification method based on load rejection test and numerical difference is proposed in this paper. In this method, the parameter identification is carried out by the combination of load rejection tests and classical time domain identification method. To form the Jacobian matrix in the parameter iteration process, the trajectory sensitivity of terminal voltage to each parameter is calculated by the numerical difference method, which can well settle the initial value problem of trajectory sensitivity at the moment of load rejection. Due to the strong observability of the load test, the method can overcome the interference of environmental noise. Meanwhile, the time-domain identification method is rigorous enough to fully account the influence of the excitation voltage variation on the identification. The identification example shows that the method is simple and feasible to carry out, and has a strong engineering application value.

关 键 词：数值差分 发电机 参数辨识 轨迹灵敏度 

分 类 号：TM721[电气工程—电力系统及自动化]