永磁同步电机宽速域模型预测转矩控制方法

Model Predictive Torque Control of PMSM Over Wide Speed Range

针对连续控制集模型预测转矩控制(MPTC)方法的复杂性和拓宽电机调速范围的需要,此处以表贴式永磁同步电机(PMSM)为研究对象,提出了一种基于非解析寻优算法的连续控制集MPTC方法。该控制方法将控制目标综合为价值函数矢量并定义了基速以下最大转矩电流比(MTPA)运行和基速以上弱磁运行的价值函数矢量,通过价值函数矢量的选择和非解析寻优实现了宽速域范围内的MPTC,确保电机在不同速域内以预定方式稳定运行且在调速过程中能平滑地切换运行方式。该方法的有效性得到了仿真和实验结果的验证。

A continuous control set model predictive torque control (MPTC) method based on non-analytical optimization algorithm is proposed for a surface mount permanent magnet synchronous motor(PMSM), considering the complexity of continuous control set MPTC algorithm and the demand for wide operating speed range of the motor.The control target is first synthesized to a cost function vector, followed by definitions of maximum torque per ampere (MTPA) and flux weakening torque control cost function vectors, then by selecting the corresponding cost function vector and optimizing non-analytically, the MPTC over wide speed range is achieved, ensuring stable operation in different modes and smooth transitions between these modes meanwhile.The validity of the proposed method is verified by both simulation and experimental results.