Modelling induction motor loads for voltage stability analysis

This paper deals with modelling induction motor loads for voltage stability analysis. A simple first order induction motor load model and a detailed third order induction motor load model suitable for this purpose are derived in terms of real power, reactive power and slip. 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 generic dynamic load model is modified to capture the dynamics represented by the proposed induction motor load models. The appropriateness of the proposed dynamic load models in analysing the transient and steady state stabilities of induction motor loads are evaluated. It is shown that the first or third order induction motor models can be used for studying the power system voltage stability, with different degrees of accuracy. (C) 2002 Elsevier Science Ltd. All rights reserved.