特征值灵敏度方法及其在电力系统小干扰稳定分析中的应用

Eigenvalue Sensitivity and Its Application in Power System Small Signal Stability

随着电力系统的发展,特别是大区互联电网的出现和扩大,小干扰稳定性问题日益突出。为了满足小干扰稳定性分析的要求,介绍了3种特征值灵敏度——特征值对元件参数、传递函数和运行参数的灵敏度计算方法,并分析了其在电力系统小干扰稳定中的应用。这3种特征值灵敏度能够弥补现有分析方法的不足,有效地指导某些装置或系统的参数设计与选址,以及调整系统的运行方式,以改善小干扰稳定性,抑制低频振荡的发生。基于灵敏度的发电重新调度法,通过合理分配系统发电机出力,使事故下受小干扰稳定约束的电力传输最大化,是小干扰稳定问题的有效解决途径之一。因此在现有的小干扰稳定分析程序中增加特征值灵敏度的快速计算功能是十分必要和迫切的。

With the development of power systems, especially the appearance and extension of large-scale interconnected power grid, the small signal stability becomes more noteworthy. To meet the demand of analysis on small signal stability, three calculation methods of eigenvalue sensitivities, i.e., the sensitivity of eigenvalue to component parameters, transfer function and operating parameters, are presented and their applications in the analysis of small signal stability of power systems are analyzed. The three kinds of sensitivities can remedy the defects of existing analysis methods, effectively guide the parameter design and location of some devices or systems and adjust operation modes of power systems to improve small signal stability and suppress the occurrence of low-frequency oscillation, By means of allocating generator output reasonably, the generation rescheduling based on sensitivity can maximize power transmission capacity restrained from small signal stability under accidents, so it is one of the effective manners to solve the small signal stability. Thus, it is very necessary and urgent to add the function of rapidly computing eigenvalue sensitivity in existing small signal stability analysis program.