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电网技术  2011 

基于随机子空间的同步电机参数高精度辨识新方法

, PP. 156-160

Keywords: 参数辨识,同步电机,随机子空间辨识,模态参数

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Abstract:

将随机子空间辨识方法应用于同步电机的参数辨识中,提出基于随机子空间辨识的三相短路电流处理新方法。随机子空间辨识是一种线性系统时域模态参数识别方法,利用系统输出的数据构造Hankle矩阵,进而分离出系统状态方程的系统矩阵和输出矩阵,从而识别系统的模态参数固有频率、阻尼比、振型。应用该法分析同步电机短路电流首先,识别时间常数;进而依次消去时间常数识别各电抗参数。分别针对无阻尼、噪声,有阻尼背景下的仿真信号和同步电机三相短路电流进行仿真分析,计算中基于振型实现系统自动定阶,同时与Prony法作对比,结果表明该法抗噪性强,检测精度高。

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