五桥臂逆变器最少模态SVPWM调制机理及特性

摘要

本文首先分析五桥臂逆变器的工作模态,建立了五桥臂逆变器切换线性模型;其次研究五桥臂逆变器状态可控性,证明了五桥臂逆变器仅需6个工作模态,就可实现完全状态可控;由此提出6模态的最少模态空间矢量脉宽调制(SVPWM).与现有SVPWM策略相比,最少模态SVPWM仅需采用一半的工作模态,简化了五桥臂逆变器的开关切换序列,从而使得功率器件的开关频率降低了2/3,减少了开关损耗,提高了逆变器效率.%On the basis of the analysis of operation modes,five-leg inverter is modeled as a switched linear system. Therefore,its state controllability can be studied, and that the five-leg inverter working with only six operation modes is completely states controllable can be verified. On the basis of the analysis, an m modes SVPWM tech-nique using 6 space vectors is proposed. Compared to the existing SVPWM strategy,the novel one only works with a half of operation modes, and by this way the switching sequences can be simplified and therefore the switching frequency is reduced by 2/3. With simplified sequences, the switching loss can be reduced and the efficiency of the inverter can be improved.