Abstract:In recent years, to reduce the influence of commonmode voltage on voltage source inverters, model predictive commonmode voltage reduction methods are widely studied. However, the conventional methods use only one nonzero voltage vector per control period, in which may bring large current harmonics. Therefore, a hybrid multivectorbased model predictive commonmode voltage reduction method is proposed. First, the principle of the proposed method is presented. Then, the influences of dead time and current ripples on the commonmode voltage are analyzed in detail, and the proposed multivectorbased model predictive control method is further improved. In the improved method, only one nonzero voltage vector is applied at current sector 7. While in other current sectors, multi nonzero voltage vectors are applied. In this way, not only can the commonmode voltage be restricted within ±Vdc/6, but also the current total harmonic distortion is reduced. Simulation and experimental results verify the effectiveness of the proposed method.