对永磁同步电机(PMSM)直接转矩控制(DTC)系统和基于定子磁链坐标系的模型预测转矩控制(MPTC)系统的控制性能、平均开关频率、参数鲁棒性等进行比较。DTC系统结构简单，平均开关频率较低，但磁链和转矩脉动大于MPTC。MPTC性能较好，但计算复杂，实时性较差。同时，两者均存在参数失配鲁棒性较差和开关频率不恒定的共性问题。针对开关频率不恒定的问题，提出一种开关频率固定的PMSM MPTC方法，可将每个采样周期开关切换次数固定为2次。仿真结果表明：该方法可使开关频率固定为采样频率的1/3，且将备选开关状态减少为3个。

Control performances, average switching frequency and parameter robustness of the direct torque control (DTC) and model predictive torque control (MPTC) based on stator flux coordinate system for permanent magnet synchronous motor (PMSM) are compared. It is shown that DTC has simpler structure and lower switching frequency. The ripples of flux and torque of DTC are higher than MPTC. MPTC has better control performances, but poor realtime performance. Poor parameter robustness and variable switching frequency are common drawbacks for DTC and MPTC. To overcome the drawbacks, an MPTC strategy is proposed, which can fix switching times at 2 in each sampling period with given candidate switching states. Simulation results show that the switching frequency of the inverter is fixed, which is 1/3 of the sampling frequency, and the number of candidate switching states is decreased to 3.

国家自然科学基金项目(51207012)；陕西省自然科学基金项目(2021JM-163);陕西省重点研发项目(2020GY-164、2019ZDLGY15-06)