Research on the infnluence of load characteristic on voltage stability

Induction-motors are the main component of the compositive load especially of the industry load and air- condition loads have been uppermost dynamic load in summer with the fast economy development, which are very important to analysis and control power system. So induction-motors and air-condition loads are studied seriously as dynamic loads in this paper. This paper studies the function mechanism and the influence of static and dynamic load characteristic on voltage stability by comparing the voltage stability simulation result of different loads based on a simple case of power system. The small disturbance analysis method is used and static load, induction-load and air-condition load are modelled in this paper. It is proved that power system get more and more voltage instability with induction-motor or air-condition load increasing, especially air-condition load.