中文摘要：

在电力机车、电动汽车以及一些工业应用中,常需要两台或者两台以上的电机并联运行。因此,系统中需要多个逆变器。为了降低成本,针对两台电机独立控制的需求,本文研究了采用五桥臂逆变器拓扑的控制系统,并提出了一种适用于五桥臂逆变器的改进型七段式PWM调制方式。该调制方式基于传统的空间矢量脉宽调制技术,通过将控制周期进行分区来实现对两台电机分别独立控制的目的。便于数字信号处理器实现是该调制方式的一大特点。仿真和实验结果验证了该调制方式的可行性和有效性。

英文摘要：

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.