Research On Harmonic And Power Factor Of Slip Energy Recovery Drive System By Simulation

The slip energy recovery drive system (SERDS) can change the motor speed by cascading a variable three phase AC source in the rotor side. It is a high efficient,reliable and low cost scheme for fan or pump drive system. On the other hand, it has the shortage of low power factor and high harmonic distortion which prevents it from spreading and using.In this paper, the basic principle is discussed,and the harmonic distortion and power factor of the system are analyzed. The simulation circuit of traditional SERDS is built up by using MATLAB/SIMULINK and the relationship between power factor, harmonic distortion and the fire angle is obtained. Aiming at the shortage of traditional SERDS,boost chopper type is proposed,the relationship between power factor,harmonic and duty ratio is also obtained and the result shows that the power factor of the system is low and the harmonic distortion is high when the motor speed is low. So, an reactive power compensation and harmonic filter device is design to improve,and simulating result shows that the power factor and the harmonic distortion can be improved by using traditional method.