Restraint of Common-Mode Voltage for PMSM-Inverter Systems With Current Ripple Constraint Based on Voltage-Vector MPC

Abstract

At present, the common-mode voltage (CMV) interference is a general problem in motor drive system with three-phase voltage source inverters. When the zero vector is applied, the inverter will generate high CMV, which will bring some negative effects to permanent magnet synchronous motor. Removing the zero vector directly can suppress CMV, but will lead to large current ripple. Aiming to balance these two factors, this article proposes a new method based on finite control set model predictive control (MPC) to suppress the CMV and ensure the high quality of the operating current. The method divides the traditional two-level space voltage vector area into active vector selection area and zero vector selection area, and the tradeoff between CMV suppression and current ripple can be realized by adjusting the size of each selection area reasonably. On this basis, a fast-double vector MPC (FDV-MPC) is proposed to further reduce the current ripple. FDV-MPC directly selects the optimal double vectors without the optimization process, which greatly reduces the computation of the algorithm. The influence of CMV generated by the FDV-MPC during dead-time is analyzed. Finally, the experimental results verify the effectiveness of FDV-MPC and new CMV suppression method.