A generic PWM strategy for multi-leg VSI-fed machine drives

用于多桥臂电机驱动系统的通用型脉宽调制策略（英文）

A generic pulse width modulation（PWM） strategy is proposed for the multi-leg voltage source inverter（VSI）.First, the multi-leg VSI is modeled, which is independent from the load structure. Secondly, the proposed PWM strategy is deduced by inverting the mathematical model of the multileg VSI. According to the relationship between the leg number of VSIs and the phase number of electrical machines, the multi-leg VSI-fed machine drives are classified into two types：matched and unmatched applications. The leg numbers of VSIs and the phase number of electrical machines are equal in matched applications while they are different in unmatched applications. The existing PWM strategies cannot be directly used for both matched and unmatched applications. However,the proposed PWM strategy can be general for both matched and unmatched applications, and no modifications are required. The effectiveness of the proposed PWM strategy is verified by experimental results.

提出了一种适用于多桥臂电机驱动系统的通用型脉宽调制策略.首先,建立不依赖于负载结构的多桥臂逆变器数学模型.其次,根据多桥臂逆变器的数学模型逆向推导出通用型脉宽调制策略.根据逆变器桥臂和电机相绕组的数量关系,将电机驱动系统分为匹配和非匹配2种类型.其中,匹配型电机驱动系统中逆变器桥臂和电机相绕组的数量相等,而非匹配型电机驱动系统中逆变器桥臂和电机相绕组的数量不等.传统的脉宽调制策略无法直接同时适用于2种不同类型的多桥臂电机驱动系统.然而,所提的通用型脉宽调制策略可以在不做任何修改的情况下同时适用于2种不同类型的多桥臂电机驱动系统.最后,实验结果验证了所提通用型脉宽调制策略的有效性.