Predictive current control method to reduce common-mode interference for three-phase induction motor

8th IEEE International Power Electronics and Motion Control Conference, IPEMC-ECCE Asia 2016

Hefei

2016.07.13

The common-mode voltage amplitude size is one of the important index to measure electromagnetic interference intensity, larger common-mode voltage can lead to severe hazards to the motor winding insulation and bearings. Through control modeling and analyzing to the common-mode voltage of three-phase motor, which driven by the voltage source inverter, found that the model predictive control (MPC) can effectively reduce common-mode voltage with less cost and size than the traditional blocking and filtering technology. However, MPC will bring the output current waveform distortion. Based on the current predictive control to the traditional three-phase induction motor, this paper introduces the influence of common-mode voltage amplitude, by adjusting the weights of the cost function to find a good balance between low current distortion and common-mode voltage reduction. This control strategy is verified through the simulation analysis which is proved to be effective and feasible.