基于IMC-异步电机调速系统的谐波抑制MPC方法

摘要

为了减少基于间接矩阵变换器(IMC)的异步电机(IM)调速系统的输入电流谐波,提出一种谐波抑制模型预测控制(MPC)方法.将输入电流谐波预测量作为权重的一部分增加到模型预测控制的评价函数中,选择系统未来时刻最优开关状态,从而提高输入电流波形,优化电流质量.仿真结果表明采用提出的MPC方法,动态时异步电机的转速、转矩能够很快地跟随给定;稳态时转速、转矩、电流波形良好;网侧电流正弦性较好,输入电流的总谐波失真(THD)有明显减小.证明了采用新方法时异步电机的动、静态特性良好,网侧电流质量较间接矩阵变换器模型预测控制方法有一定改善.%In order to reduce harmonics of input current,a novel model predictive control(MPC)method to reduce the harmonics of input current for indirect matrix converter(IMC)drive induction motor(IM)was proposed. The predictive value of the input current harmonics was involved in the calculation of the cost function with other traditional predictive values. The quality of input current could be improved through this method. The simulation results verify that the speed and torque can follow the reference in dynamic. And the waveforms of speed,torque and current of IM can meet the requirements static performance. The total harmonic distribution(THD)of the input current has been reduced obviously. They prove the method which was proposed can make the system achieve the satisfactory dynamic and static performance. Compared with the MPC method for IMC,the quality of the input current has been improved in this novel method.