开绕组永磁同步电机零矢量注入模型预测控制

Improved model predictive zero vector injection control foropen-winding permanent magnet synchronous motors

针对开绕组永磁同步电机在共母线型拓扑结构中存在的零序电流问题,提出一种零序电流抑制的改进模型预测控制方法。采用无差拍预测模型,得到跟随系统状态变量给定的期望电压矢量,根据电压误差最小化原则确定最优基本电压矢量,并划分占空比间隔选取出最优基本电压矢量的作用时间。改进后的模型预测控制,通过比较非零电压矢量所产生的零序电压与参考零序电压的大小得到所需补偿的零序电压,并将其注入系统完成补偿,具有调制简单、运算精确度可根据用户需求灵活选取的优点。仿真结果表明,改进方法能够对零序电流进行有效抑制,提高了电机的控制性能,并最大程度地提升了直流母线电压的利用率。

In order to solve the zero-sequence current problem of open-winding permanent magnet synchronous motors(OW-PMSM)with common direct current(DC)bus,an improved model predictive control method based on zero-sequence current suppression is proposed.Through the deadbeat predictive model,the required voltage vector was calculated,then the optimal basic voltage vector was selected according to the error minimization principle.At the same time,the duty cycle interval was divided to select the optimal basic voltage vector action time.On this basis,it calculated the magnitude of the zero sequence voltage generated by the non-zero voltage vector,and made the difference with the reference zero sequence voltage to obtain the magnitude of the zero sequence voltage that needed to be compensated.Finally,the compensation by the injection of the zero voltage vector was completed,thereby forming an improved model predictive control.This method has the advantages of simple modulation and flexible selection of arithmetic precision.The simulation results show that this method can effectively suppress the zero-sequence current,improve the operating performance of the motor,and on this basis,maximize the utilization of the DC bus.