Abstract
At present, the common-mode voltage (CMV) interference is a general problem in motor drive system of 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 (PMSM). The method of removing the zero vector directly can suppress CMV, but will lead to large current ripple. Aiming at the problem of how to balance these two factors, this paper proposed a new method based on finite control set model predictive control (FCS-MPC) to suppress the CMV. The quality of the output current can be guaranteed while the CMV of the drive system is suppressed. The method divides the traditional two-level space voltage vector area into active vector selection area and zero vector selection area, and the trade-off between CMV suppression and current ripple can be realized by adjusting the size of each selection area reasonably. Finally, the feasibility and effectiveness of proposed method is verified by simulation results.
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