针对传统直接转矩控制(DTC)方法中电压矢量切换时间不固定以及电压矢量切换点受限于滞环宽度等问题，将模型预测控制(MPC)应用于永磁同步电机(PMSM)DTC系统，提出了一种优化的电压矢量预测选择方法。一方面，将预测的定子磁链和电磁转矩送入相应的滞环控制器，从电压矢量有限集中选择合适的电压矢量以确保预测的磁链和转矩分别在各自的滞环内；另一方面，引入代价函数和优化策略，选择不同情况下相应的最优电压矢量，且可以同时考虑电流保护等额外的控制目标。在一台凸极PMSM驱动平台上对所提出的控制策略进行了试验验证。试验结果表明，所提出的控制策略能够有效地将转矩控制在滞环内，验证了该策略的有效性。

In conventional direct torque control (DTC), the switching instant of the voltage vector is variable and the switching point of voltage vector is limited by the hysteresis band. The model predictive control (MPC) is applied in permanent magnet synchronous motor (PMSM) DTC system, and an optimized voltage vector prediction selection method is analyzed. On one hand, the predicted stator flux linkage and electromagnetic torque are input into the corresponding hysteresis controller, and the appropriate voltage vector is selected from the limited set of voltage vectors to ensure that the predicted flux linkage and torque are within the corresponding respective hysteresis. On the other hand, the cost function and optimization strategy are introduced to select the corresponding optimal voltage vector under different conditions, and the control objectives besides current protection can be considered at the same time. The proposed algorithm is experimentally verified on a salient pole PMSM drive platform. Experimental results show that the proposed control strategy can effectively control the torque within the hysteresis controller, which verifies the effectiveness of the strategy.

国家自然科学基金项目(52077219,51807199)