单相级联型多电平逆变器一维空间矢量调制方法

One-Dimensional Space Vector Modulation for Single-Phase Cascaded Multilevel Inverter

电压空间矢量脉宽调制算法在应用于多电平变换器场合时存在计算复杂、扩展性差的缺点。针对单相级联型多电平逆变器,结合错时采样原理,提出一种简化一维空间矢量调制算法。通过简单运算可以得到一维电压矢量的选取和相应的作用时间,并合理选择优化的开关导通序列,同时利用冗余开关状态实现死区,有效地避免了桥臂直通的危险。仿真和实验结果证明了本文提出调制方法的正确性和可行性。

In allusion to such defects in traditional voltage space vector pulse width modulation algorithm as complex calculation and weak expansibility when it is applied in multilevel converter,based on sampling time staggered space vector modulation theory a simplified one-dimensional space vector modulation algorithm for single-phase cascaded multilever inverter is proposed.Through simple operation the selection of one-dimensional voltage vector can be chosen and corrsponding action time can be obtained,and the optimized firing sequence of the valves can be reasonably selected;redundant switch status is utlized to implement the dead zone is achieved to effectively avoid the danger of short-circuit of bridge arms.Simulation results show that the proposed modulation method is correct and feasible.