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 In the study of generator subsynchronous oscillation, the linearized matrix used in the eigenvalue analysis of small-signal stability analysis needs to establish a model for the whole system. In order to accurately judge whether the system excites sub-synchronous oscillation, it is necessary to know the damping coefficient in the equations of motion of each concentrated mass, and the attenuation coefficient provided by the project at each natural oscillation frequency of the shaft system is very large Inconvenience In this paper, Prony algorithm is used as a parameter to determine the practical method of obtaining the damping coefficient from the damping coefficient of each oscillation mode, and the case study of the research system, the identification results and the experimental system is very good Anastomosis