三相不平衡系统中感应电机谐波抑制方法研究

Research on Harmonic Suppression Method of Induction Motor in Unbalanced Three-phase System

针对如何抑制三相不平衡系统中的感应电机谐波展开研究,提出了一种适用三相不平衡交流系统中感应电机的谐波抑制方法。首先,采用快速电流监测装置精确地监测三相交流电机电流;然后,通过傅里叶变换提取三相交流电流中的谐波分量,将其输入到模糊自适应模块库中,快速获取不同谐波分量的补偿信息;最后,经由谐波PWM补偿信号模块输出对应的PWM补偿信息,完成三相交流电机的谐波补偿。该方法改善了三相交流电网中的电能质量,同时降低了三相交流电机中的谐波分量,并通过系统仿真试验验证了该方法的正确性。

This paper mainly focuses on how to suppress the harmonic of induction motor in unbalanced threephase AC system,and proposes a harmonic suppression method for induction motor in unbalanced three-phase AC system.Firstly,the fast current monitoring device is used to quickly and accurately monitor the current of three-phase AC motor,and the harmonic component of three-phase AC current is extracted by Fourier transform,and the harmonic components of current are input into the fuzzy adaptive module library to quickly obtain the compensation information of different harmonic components.The corresponding PWM compensation information is output through the harmonic PWM compensation signal module.Finally,the harmonic compensation of three-phase AC motor is completed,which can improve the power quality in the three-phase AC network,and reduce the harmonic component in the three-phase AC motor.The correctness of the method is verified by simulation test.