Coherent vector-based model predictive control with zero-sequence component injection for three-level NPC inverter fed PMSM drives

Abstract

Conventional model predictive control (MPC), which selects one basic voltage vector through the enumeration process, exhibits relatively high output ripples. To enhance the control performance, a three-level neutral-point-clamped inverter is applied, although this increases the complexity of the control algorithm for permanent magnet synchronous motor. In the proposed MPC scheme, a set of coherent voltage vectors (CVVs) with movable starting points is introduced to replace the basic candidates. The pulse train of the optimal CVV is generated by single-carrier modulation, and capacitor charge balancing in different sectors can be included in the zero-sequence component injection. The proposed CVV-MPC is characterized by simple implementation and satisfactory performance under low switching frequency. Comparative experiments are conducted to verify the effectiveness and superiority of the proposed method.