电力系统功角稳定鞍结分岔控制研究

Research into Saddle-node Bifurcation Control for Improving Power System Angle Stability

电力系统是典型的非线性动力系统,鞍结分岔是其固有的分岔现象.以一个含励磁控制的简单电力系统为例,运用Matlab数值分岔分析工具箱MATCONT对其进行了单参数分岔分析,成功搜索出了鞍结分岔点,同时双参数分岔结果显示励磁电压对延迟鞍结分岔、提高系统的功角稳定性有着重要的作用.为进一步提高系统的稳定性,设计了一个静态负反馈控制器,MATCONT分岔分析结果表明,加入该控制器可有效延迟系统的鞍结分岔点.

Eleetrical power systems are typically nonlinear dynamic and saddle-nude bifurcation （SNB） is a kind of eonnatural bilureation phenomenon in a power system. In this paper, the Matlab-based numerical bifureation analysis package MATCONT is used to study bifurcations in a simple power system with excitation control, and the SNB point of the system is obtained successfully. Tire double ,parameters analysis resnh shows that excitation voltage plays an important rule in delaying saddle-node bifurcation and maintaining the angle stability of the system. In attempting to improve the stability of the system, static state feedbaek control is designed. The MATCONT bifureation analysis results indicate that the feedback contrul can delay the SNB point effectively.