用最小二乘辨识方法测取水轮发电机参数

Parameter Estimation of a Hydrogenerator by Least Square Estimation

本文提出用最小二乘辨识方法测取水轮发电机的参数。在水轮发电机带负载运行时，对励磁系统施加阶跃干扰，量测电机电压、电流及功角的暂态响应，采用适当简化的大扰动数学模型并将功角也用作观测量，可以一次辨识出和等效无穷大电ＵＣ及等效连接线路阻抗ＸＬ。由所得参数算出的暂态过程与实测过程有较好的拟合。本法为首次在现场水轮发电机上应用时域大扰动模型辨识参数成功。

A Least Square Estimation(LSE) method is proposed in this paper to estimate the parameters of a hydrogenerator.A sudden change of excitation is imposed to the generator when it is under load operation and its transients of voltages,currents and rotor angle are recorded, with the rotor angle is used as an observation arguement,the parameters of xd,Td0,xq,H,D and the equivalent infinity source UC and the equivalent connecting line reactance XL can be estimated.The transients by simulation with these parameters fit the test well.