基于零序分量注入的相干矢量模型预测控制在三电平NPC逆变器供电PMSM驱动中的应用

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.