Local reactive power compensation to asynchronous motor is an effective way with less investment and quick result. In this paper

the selection of compensation capacity is discussed and the local reactive power compensation of asynchronous motor is simulated by the use of Matlab/Simulink. It is verified by the simulation that better compensation result can be obtained under the condition of no occurrence of over compensation and self-excitation overvoltage of the local reactive power compensation of asynchronous motor under different conditions. And the influence to compensation in the case of voltage variation and limit of surge current in case of capacitor switching are analyzed.