Study on the effect of air conditioner load on voltagestability of urban power system

An air conditioner load model based on test data is presented.On the basis of reactive power-voltage characteristics analysis of air conditioner load,this paper studies on the effect of air conditioner load on voltage stability of urban power system by changing load components and load increasing modes.Static voltage stability analysis method is adopted.The computational analysis of a real urban power system in East China shows that air conditioner load has a bad impact on voltage stability of an urban power system.The increasing either in total load or in the proportion of the total load will both decrease the voltage stability.So measures should be taken to prevent voltage instability,especially for the system which has small loading margin and poor reactive power.