Common-Mode Voltage Mitigation in Dual Three-Phase Drives using Predictive Control and Modulated Virtual Vectors

A model predictive control (MPC) method coupled with using a unique set of virtual voltage vectors for a dual three-phase (DTP) permanent magnet synchronous motor (PMSM) drive system to reduce and eliminate high-frequency common-mode (CM) voltage is presented in this paper. The MPC method uses vector space decomposition to map system variables into two orthogonal subspaces, one representing the energy conversion terms and the other reflecting the harmonic components. Using the separated variables, the controller synthesizes the virtual voltage vectors to reduce system CM voltages. The performance of the proposed control and modulation method is verified and compared with the standard space vector modulation (SVM)-based methods through simulations and experiments.