直驱式永磁同步电机改进型无差拍直接转矩控制研究

Research on Improved Deadbeat Direct Torque Control of Direct-Drive Permanent Magnet Synchronous Motor

为提高直驱式永磁同步电机(DD-PMSM)的动态响应性能,提出了一种改进型无差拍直接转矩控制(DB-DTC)策略。改进型DB-DTC在保留传统DB-DTC动态响应性能的基础上,简化了控制过程,降低了实时计算量。通过在MATLAB/Simulink环境下搭建仿真模型,对传统DB-DTC和改进型DB-DTC的控制效果进行对比,并将改进型DB-DTC结合位置型阻抗控制策略,验证控制策略的优越性。仿真结果表明,在位置控制模式下,相对于传统DB-DTC,所提控制策略的电机转动至给定角度以及转速降为零所需的时间减少0.002 s,稳态运行角度误差减少0.02°。在速度控制模式下,相对于传统DB-DTC,所提控制策略的电机达到给定转速的时间减少0.004 s,稳态转速误差降低0.03 r/min,稳态转速波动降低0.06 r/min,在电机进入稳态运行以后,q轴电流峰值降低0.193 A,q轴的电流脉动降低0.204 A。电机控制系统具有更好的动态性能和更强的抗干扰能力。

In order to improve the dynamic response performance of direct-drive permanent magnet synchronous motor(DD-PMSM),an improved deadbeat direct torque control(DB-DTC)strategy is proposed.On the basis of retaining the dynamic response performance of traditional DB-DTC,the improved DB-DTC simplifies the control process and reduces the amount of real-time calculation.The control effects of traditional DB-DTC and improved DB-DTC are compared by building a simulation model in MATLAB/Simulink,and the advantages of the proposed control strategy are verified by combining the improved DB-DTC with the position type impedance control strategy.The simulation results show that in the position control mode,compared with the traditional DB-DTC,the time required for the motor to rotate to a given angle and decelerate to zero speed is reduced by 0.002 s,and the steady-state operation angle error is reduced by 0.02°.In the speed control mode,compared with the traditional DB-DTC,the time to reach the given speed is reduced by 0.004 s,the steady-state speed error is reduced by 0.03 r/min,and the steady-state speed fluctuation is reduced by 0.06 r/min.After the motor enters steady-state operation,the q axis peak current is reduced by 0.193 A,and the pulsation of q axis current is reduced by 0.204 A.The motor control system has better dynamic performance and stronger anti-interference ability.