在电力系统的次同步振荡分析当中,以往提出的基于系统线性化方程求解的小扰动分析方法极易形成“维数灾”,在实际复杂系统中的应用非常困难。利用Prony方法来辨识系统模型,较好的解决了电力大系统建模困难的问题。在实际系统中,不是所有状态变量都能采取利用,所以采用了状态观测器来重构系统状态,并在此基础上,利用线性最优控制理论设计了附加次同步阻尼控制器。在南方电网的实际模型中,对该控制器进行了时域仿真验证,证明了该控制的有效性和快速性。
In the analysis of Sub synchronous oscillation in power system, the small disturbance method, which is based on the linear equations of the system, is very difficultly applied to an actual complex system, because of dimension calamity'. In this paper, Prony method is applied to identify system model, which is a better solution of the big power system modeling problem. In the real systems, not all state variables are to be measured, so it is to reconstruct system status by the State-Oberver, and an additional damping controller is designed by linear optimal control theory. In the practical model of southern power system, the time domain simulation for the controller proves it the effectiveness and the rapidity.