Common Mode Voltage Mitigation using a New Modified Model Predictive Control (MMPC) in a Three Phase Voltage Source Inverter

Abstract

In this paper a modified predictive current control (MMPC) strategy for a voltage source inverter VSI is proposed. This method replace the selected zero vectors in the conventional MPC by the two active vectors V1 and V4 for time T1 and T2 respectively in a one sampling period Ts, with the purpose of obtaining a better harmonic performance and a reduction of the common mode voltage CMV. The efficiency of the proposed control strategy is evaluated using a numerical simulation (Matlab-Simulink). The obtained results show a decreasing THD from 3.57% to 3.38% (19% improvement) as well as mitigation of CMV from $\pm\frac{\mathrm{v}_{\mathrm{d}\mathrm{c}}}{2}\mathrm{t}\mathrm{o}\pm\frac{\mathrm{v}_{\mathrm{d}\mathrm{c}}}{6}$ They are compared with the results obtained by the conventional model predictive control and the MPC using only the six active vectors which select one active vector each sampling period.