Research on modulation method of five-leg inverter fed dual induction motor drive system

In electric trains,electric vehicles and some industry applications,two or more motors are needed to operate in parallel.Therefore,multiple inverters are needed in these drive systems.In order to reduce the system cost,a dual induction motor drive system fed by a five-leg inverter with independent control is investigated in this paper.An improved 7-section modulation method,which is based on the traditional Space Vector PWM(SVPWM) technology and which divides the control period into two parts,is proposed to control the five-leg inverter.This method is suitable to be implemented by DSP,which is its main advantage.Through simulation and experiments,the feasibility and effectiveness of the proposed method are proved.