计及感应电动机负荷的静态电压稳定性分析

该文建立计及感应电动机机电暂态过程的单负荷无穷大系统的小干扰电压稳定分析数学模型，分析了感应电动机负荷参数变化对小干扰电压稳定性的影响。以简单系统为例，说明了基于潮流模型的静态电压稳定指标的共同物理本质，文中通过不同感应电动机负荷参数的小干扰稳定分析和时域仿真，对基于潮流模型的静态电压稳定指标进行了准确性分析。分析结果表明：以前基于潮流模型的静态电压稳定指标忽略了电力系统的动态负荷因素，其指标认为是电压稳定的系统却可能发生电压失稳，因此，基于潮流模型的静态电压稳定指标是不准确的。该文提出的小干扰电压稳定分析数学模型是电压稳定的一种简化分析，在实时等值系统的基础上具有在线应用的前景。

STATIC VOLTAGE STABILITY ANALYSIS CONSIDERING INDUCTION MOTOR LOADS

A small disturbance voltage stability analysis mathematical model of single load and infinite bus system is presented including electromechanical transient model of induction motor. The influence of induction motor parameters on eigenvalues on a simple power system is analyzed. The common physical essence of static voltage stability indices based on power flow model is illustrated on a simple system. The accuracy of static voltage stability indices based on power flow model is analyzed by small disturbance voltage stability analysis and dynamic simulation with different parameters of induction motor. The results show that static indices based on power flow model is not accurate. The system may lose voltage stability which the static indices regard it is voltage stability. The small disturbance voltage stability analysis mathematical model in this paper is simplified analysis. It is expected to be used in the on-line environment in the future.