摘要
提出基于随机子空间和总体最小二乘相结合的同步电机参数识别新方法。根据同步电机三相短路后a相电流的时间序列,由随机子空间法辨识出电流各分量的频率和衰减因子;再由总体最小二乘法求得各分量的幅值,据此辨识得同步电机各参数。仿真算例表明了文中提出的方法可用于同步电机的参数辨识,并通过与现有方法的对比表明该法可提高参数辨识的精度。
A new method is proposed in this paper for synchronous parameter estimation. This method includes two stage estimation processes. The first stage uses stochastic subspace identification (SSI) method to esti- mate frequency and damping ratio of each current component based on measuring a-phase post--fault current. And then the next stage considers total least squares (TLS) in order to estimate the magnitude of each oscilla- tory component based on the parameters of synchronous machine. Simulations show that the method proposed in this paper can improve the estimation accuracy.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2012年第6期58-61,77,共5页
Proceedings of the CSU-EPSA
关键词
同步发电机
随机子空间法
总体最小二乘
参数辨识
synchronous machine
stochastic subspace identification(SSI)
total least squares(TLS) ~ parame-ter identification