基于调制系数最优法的TLDMC-PMSM新型直接转矩控制

针对矩阵变换器永磁同步电机系统(MC-PMSM)直接转矩控制方法出现的转矩磁链脉动大、幅值失调、系统鲁棒性弱等问题，提出了一种基于调制系数最优法的三电平直接矩阵变换器永磁同步电机(TLDMC-PMSM)新型直接转矩控制方法。首先描述了MC-PMSM直接转矩控制系统的原理；其次用三电平直接矩阵变换器替换两电平矩阵变换器，转速环通过复叠式螺旋滑模控制、转矩磁链环通过超螺旋滑模直接转矩控制替换传统的比例积分控制，并且引入调制系数最优法来抑制电机转矩波动逐渐增大，进而实现对永磁同步电机的精确控制；最后通过MATLAB/Simulink仿真软件和硬件实验验证所提方法的可行性与优越性。

New direct torque control of TLDMC-PMSM based on modulation coefficient optimization method

Aiming at the phenomena of large torque flux ripple, amplitude imbalance and weak system robustness in matrix converter permanent magnet synchronous motor system based on direct torque control, a new direct torque control system of three-level direct matrix converter permanent magnet synchronous motor(TLDMC-PMSM) based on modulation coefficient optimization method is proposed. The brief principle of matrix converter permanent magnet synchronous motor system based on direct torque control is described. Then, the matrix converter is replaced by a three-level direct matrix converter, the traditional proportional integral control is replaced by the cascade spiral sliding mode control of the rotational speed loop and the super twisting sliding mode control-direct torque control of the torque magnetic link, and the modulation coefficient optimization method is introduced to suppress the gradual increase of motor torque fluctuation, so as to achieve accurate control of permanent magnet synchronous motor. The feasibility and superiority of the proposed method are verified by MATLAB/Simulink simulation software and hardware experiments.