基于向量场正规形理论的电力系统低频振荡分析  

Power System Low Frequency Oscillation Analysis Based on Normal Forms Theory of Vector Fields

作　　者：党杰[1] 刘涤尘[2] 曾聪[2] 

机构地区：[1]华中电网有限公司,湖北武汉430077 [2]武汉大学电气工程学院,湖北武汉430072

出　　处：《电力科学与工程》2012年第2期26-31,共6页Electric Power Science and Engineering

摘　　要：正规形分析方法在传统的线性模式分析法中计入了非线性的影响,能够从系统内部结构入手分析系统的动态特性,因而可将小信号稳定方法与时域仿真方法有效结合起来。基于非线性向量场的正规形变换推导了电力系统状态方程的二阶近似解析解,提出了度量电力系统非线性程度大小的非线性指标,并揭示了低频振荡模式间的非线性相关作用以及对电力系统动态特性的影响。仿真分析的结果验证了该方法的正确性和有效性,表明该方法是电力系统低频振荡分析的有效工具。The influence of nonlinearity is added into normal form analysis method besides traditional linear modal analysis. This method can analyze the dynamic characteristics from system inner structure, and it can combine the small signal stability analysis with time domain simulation method effectively. In this paper, the two-order approxi- mate analytic solution of power system state equation is derived based on normal form transform, the normal form index is proposed for measuring power system normal form degree, the nonlinear interactions of low frequency oscil- lation modal and the influences to power system dynamic characteristics are also proposed. The validity and effect of this method are verified by simulation analysis, and this method is an effective tool for low frequency oscillation a- nalysis.

关 键 词：电力系统 低频振荡 正规形 非线性 

分 类 号：TM301.2[电气工程—电机]