Voltage stability and voltage recovery: effects of electric load dynamics

This paper discusses voltage stability and voltage recovery phenomena following typical faults on a power system. A modeling approach is proposed that combines the efficiency of power flow techniques and capabilities of transient stability models. The proposed methodology is based on a quadratic model of the electric power system, including generators and dynamic loads consisting mainly of induction motors. It is shown that the proposed method and model explains recent observed voltage stability and voltage recovery phenomena. Numerical experiments are presented for the purpose of quantifying the phenomena and identifying the major parameters affecting these phenomena