多电平逆变器的通用空间矢量调制算法

Universal space vector modulation algorithm for multilevel inverters

为解决多电平逆变器的空间矢量调制(SVM)算法设计及实现的复杂性问题,提出了基于参考电压分解和零序电压等效的新型多电平SVM算法。参考电压分解的方法将任何电平数目的开关矢量选择问题都简化成二电平SVM算法来解决;基于零序电压等效的SVM波形控制方法简化了开关状态的选择问题,并使其与逆变器性能优化控制问题得到有机结合。所提的多电平SVM算法设计简单并且占用计算时间少,同时算法设计不依赖于电平数目,所以具有通用性。所提算法适用于任何电平数目的逆变器的空间矢量调制,并通过在数字信号处理器(DSP)上的实现结果及具体应用实例的仿真结果得到验证。

A simple, fast, and generally applicable multilevel space vector modulation (SVM) algorithm is described in this paper. The complex reference voltage vector is decomposed into an offset vector and a two-level model. Thus a complicated multilevel SVM control problem is simplified into a simple two-level SVM problem. The zero-sequence reference voltage is used to determine the switching states and their duty cycle so the control issues can be easily simplified. The proposed algorithm was implemented using a DSP-based modulator for multilevel inverters. Test and simulation results show that the algorithm is very simple and computationally efficient.