基于正规形变换考虑发电机励磁控制的电力系统暂态稳定分析

当考虑发电机的励磁控制时,难以确定系统的稳定域。根据非线性动力系统理论,非线性系统的稳定域边界是由稳定边界上的不稳定平衡点处的稳定流形的并集构成。当系统受到大扰动时,主导不稳定平衡点(CUEP)上的稳定流形就是电力系统的稳定边界。通过正规形变换,将非线性的系统映射到线性系统,根据线性空间的稳定子空间来确定原始系统的稳定流形,写出稳定边界的表达式。当持续故障轨线和系统的稳定边界相交时,就求得故障临界切除时间。实际仿真结果表明该方法是有效的,且略有保守。

Power system transient stability research for excitation control based on normal form theory

The transient stability region is difficult to be determined considering excitation control of a generator. According to the theory of nonlinear dynamic system,the stable boundary is the union of the stable manifolds of the unstable equilibrium points on the stable boundary. To transform the nonlinear power system into a linear system on Controlling Unstable Equilibrium Point(CUEP) based on normal form theory,according to the stable subspace of the linear system,this paper can get the stable manifolds of the nonlinear power system. So,a new stable region and its detailed expression are obtained. When the fault track gets across the stable region boundary,the time is the critical clearance time. The stimulated results prove this method to be valid. This paper is supported by National Natural Science Foundation of Guangxi Province(No.0728027) .