电压稳定分析中异步电动机动态负荷建模探讨

探讨电压稳定分析中异步电动机(IM)负荷的建模问题。分析一般的动态负荷模型(GDLM)不能捕捉IM动态行为的机理。分别以IM的滑差模型和滑差磁链模型为基础，严格地导出了适用于电压稳定分析的简化一阶(SIM)和详细三阶(DIM)动态负荷模型，同时还说明了SIM和DIM模型实质上是对GDLM模型进行了不同程度的改进。对SIM和DIM模型在暂态电压稳定分析和静态电压稳定分析中的适用性进行分析比较，仿真结果表明：SIM和DIM分别以不同的准确度适用于不同场合的电压稳定分析。

Discussion of modeling induction motor loads for voltage stability analysis

This paper deals with modeling induction motor loads for voltage stability analysis. A simple first order and a detailed third dynamic load model for an induction motor are derived from the slip and slip flux models respectively. The dynamic load models suitable for voltage stability analysis are derived in terms of active power, reactive power and slip. The coupling hetween the P and Q dynamics are accurately represented in the models, it is shown analytically that the generic dynamic load models(GDLM)proposed in the literature, in their present form, are incapable of capturing induction motor characteristics. The GDLM is modified to capture the dynamics represented by the proposed induction motor load models. The appropriateness of the proposed dynamic load models in analyzing the transient and steady state voltage stabilities of induction motor loads are evaluated. It is shown that the first or third order induetion motor model can be used for studying the power system voltage stability,with different degrees of accuracy.