多电平逆变器新型空间矢量调制算法

A Novel SVM Algorithm for Multilevel Inverter

多电平逆变器空间矢量调制过程繁琐,基于参考电压分解理论,提出了一种适用于任何电平数逆变器的新型空间矢量调制算法。该调制算法将六个扇区内参考电压归一化至第一扇区,然后将参考电压直接分解至两电平,代入两电平空间矢量调制算法计算矢量作用时间,由两电平开关状态作用顺序进行反修正得到第一扇区等效开关状态,再经过反归一化获得六个扇区内开关状态作用顺序。实验结果验证了算法的可行性和有效性,且调制过程简单,易于实现,占用处理器资源少,实时性高。

Based on the reference voltage decomposition theory,a novel space vector modulation algorithm for multilevel inverters is proposed.The modulation algorithm normalizes the reference voltage in six sectors to the first sector,and then directly decomposes the reference voltage to two levels.It is substituted into the two-level space vector modulation algorithm to calculate the vector action time.The equivalent switch state in the first sector is obtained by inverse correction of the two-level switch state action sequence,and then the switch state action sequence in the six sectors is obtained by inverse normalization.The experimental results verify the feasibility and effectiveness of the algorithm.The new algorithm has simple modulation process,easy implementation,less processor resources and high real-time performance.