开绕组电机驱动用双逆变器死区效应补偿方法

与传统两电平逆变器的死区效应不同,开绕组电机驱动系统中双逆变器的开关死区将导致零序电压和零序电流,使绕组电流出现低频次谐波,影响系统的性能。提出了一种双逆变器开关死区导致的零序电压的补偿方案,通过扩展占空比最大的一路开关信号的导通时间,来插入一个补偿电压矢量,利用补偿电压矢量产生的零序电压抵消开关死区导致的零序电压,从而抑制系统的零序电压和零序电流。通过在开绕组感应电机驱动系统中的仿真和试验,验证了死区补偿方法的有效性。

Compensation Method for DeadTime Effect of Dual TwoLevelInverters in OpenEnd Winding Motor Drives

Different from the deadtime effect of conventional twolevel inverters, zerosequence voltage and current could be produced by the switching dead time of dual inverters in openend winding motor drives, and consequently low frequency harmonics emerged in winding currents which led to negative effects on performance of the drive systems. A compensation scheme for the zerosequence voltage produced by the switching dead time was proposed. By inserting compensation voltage vectors, the method counteracted the zerosequence voltage produced by the switching dead time using that of the compensation voltage vectors. Therefore, the zerosequence voltage and current of the system could be reduced. The proposed compensation strategy was validated by the simulation and experiments in an openend winding induction motor drive system.