平稳高效的开关磁阻电机控制算法

Smooth and Efficient Control Algorithm for Switched Reluctance Motor

目的为了提高自动化包装生产线上的产品质量,针对开关磁阻电机本身结构所引起的转矩脉动问题,提出一种基于改进电压矢量选择规律的转矩占空比控制方案。方法首先,在原有的直接转矩控制12扇区矢量选择表的基础上设计一种新的增转矩矢量选择规律,抑制换相区的转矩脉动,并采用不产生负转矩的减转矩矢量,提高转矩电流比。此外,设计一种转矩占空比控制方法,通过对下一周期转矩的估计,来确定电压矢量作用的时间,从而使得输出转矩能够快速并且稳定地跟随给定转矩。结果在Matlab/SIMULINK仿真环境下,搭建所提方法的模型,并与模型预测直接转矩控制、基于直接退磁矢量选择表的转矩占空比控制这2种方法搭建的模型进行对比,结果表明,文中方法的转矩脉动在各种工况下比另外2种方法减小了31%~57%,转矩电流比较模型预测直接转矩控制中方法提高了35%~44%,与另一种方法仅相差1%~2%。结论文中方法使得开关磁阻电机在运行过程中更为平稳,且效率较高。

To improve the product quality of automatic packaging production line,a new strategy of torque duty ratio control based on improved voltage vector selection rules is presented to solve the high torque ripple due to the structure of switched reluctance motor(SRM).First,based on the previous voltage vectors selection table of direct torque control in 12 sectors,a new increasing torque vectors selection rule is proposed to reduce the torque ripple at commutation intervals.The decreasing torque vectors which produce no negative torque are also adopted to enhance torque-per-ampere.Second,a new method of torque duty ratio control is designed.By estimating the torque in next period,the actuation duration of voltage vectors can be determined,so that the output torque will track the torque reference as rapidly and steadily as possible.Finally,through building a model of proposed method in Matlab/SIMULINK environment and comparing with models of both the model predictive direct torque control and the torque duty ratio control based on direct demagnetization vectors selection table,the results show that the torque ripple of proposed method can be decreased by 31%to 57%than the other two methods.The torque-per-ampere of proposed method can be increased by 35%to 44%than model predictive direct torque control and be decreased only by 1%to 2%than the other method.By using the proposed method,SRM will run more smoothly and efficiently.