含SVC的组合电力系统动态建模及稳定性分析方法

MODELING AND STABILITY ANALYSIS OF COMPOSITE POWER SYSTEMS INSTALLED WITH SVC

针对包含 FACTS元件的组合电力系统电压或电流因开关特性而发生突变以及系统拓扑周期改变等特点 ,提出对 SVC调制工作过程建立包括发电机在内的详细动态模型。然后利用Poincaré映射对系统动态稳定性进行分析 ,并将自动微分技术引入 Poincaré映射中雅可比矩阵的运算。同时 ,基于 Floquet理论建立其平均模型 ,并将这两种模型进行了分析与比较。仿真结果表明 ,包含 SVC的组合电力系统在 SVC调制工作过程中是动态稳定的 ,而且两种分析方法都是有效的 ,从而为分析组合电力系统的动态稳定、次同步振荡提供了一个新的思路。

Considering the sudden changes of current or/and voltage in a composite power system due to the switching on and off of FACTS devices in the system, this paper presents a detailed dynamic model of the modulation process of the static var compensator (SVC). Poincare mapping is employed to analyze the dynamic stability of the system, and the automatic differentiation technology is introduced to compute the Jacobian matrix of the Poincare mapping. Furthermore, the averaged model based on the Floquet theory is established and compared with the dynamic model proposed in the paper. The simulation results show the validity of the proposed method. This paper provides a new way for the further study of small signal stability, sub-synchronous oscillations, and transient stability of the composite power system.