次同步谐振的线性化解析与阻尼系数处理

在研究发电机次同步振荡时，基于小信号稳定分析特征值计算所用到的线性化矩阵，需要对全系统建立模型。为准确判断系统是否激发次同步振荡，必须知道各集中质块的运动方程中的阻尼系数，而工程中所提供的是轴系各自然振荡频率下的衰减系数，这给研究工作带来很大的不便。文中利用Prony算法作为参数确定的手段，提出从各振荡模态的衰减系数获得轴系运动方程中的阻尼系数的实用方法，并对研究系统进行了实例分析，其辨识结果与试验系统很好地吻合。

LINEARIZATION ANALYSIS OF SUBSYNCHRONOUS RESONANCE AND DETERMINATION OF GENERATOR MECHANICAL DAMPING

In the study of SSR, the linear matrix for eigen--analysis is based on small signal stability theory. It is necessary tobuild a model for the whole system. Damping in the motion equation of each shaft mass needs to be known in the study ofSSR. However, It is very inconvenient when only attenuation coefficient of each oscillation mode is given. In this paper Pronyanalysis is used and a practical method is proposed to identify the damping parameters from attenuation coefficient of eachmode. Finally an example is given. The identification result fits the original model very well.This project is supported by CNSF: Flexible AC Transmission Systems (Thyrlstor Controlled Series Compensation)Technology (No. 59637050).