Design of three-level inverter in permanent magnet synchronous motor system based on repetitive control

The topology of neutral-point clamped (NPC) is widely used for multilevel inverters, and the balance of the neutral-point voltage is one of the key technologies which determines the performance of Permanent Magnet Synchronous Motor(PMSM). Repetitive control can ensure control precisions by keeping the appropriateness of the control signal when the system is stable. In this paper, neutral-point balancing control scheme and repetitive control scheme used in the algorithm of PMSM drive system based on three-level topology was established to improved the dynamic and static performance of system. Our results indicates that the repetitive+PI control scheme provides better transient and steady state performance than classical PI control scheme for PMSM.