双端级联式三电平逆变器的调制算法研究

摘要

A novel simplified algorithm , which avoids the need of the sector judgment and look-up table , is adopted for the double-ended cascaded three-level inverter in this paper .This algorithm is capable of quickly obtaining the trigger pulses of switches according to the three-phase instantaneous phase voltages .To solve the zero-sequence circu-lation problem inherently existing in the double-ended cascaded three-level inverter , we adjust the time allocation of redundant zero vectors to achieve the mean elimination of zero-sequence voltage .Very simple measure , which is namely to select an appropriate time offset , is took to suppress the zero-sequence voltage .The experimental platform is built and the simplified algorithm is experimentally verified .%针对双端级联式三电平逆变器采用一种新型简化控制算法，该算法无需扇区判断和查表，根据三相瞬时相电压即可快速获得各开关器件的触发脉冲；为解决采用共母线结构的双端级联式三电平逆变器固有的零序环流问题，通过调整冗余零矢量的作用时间分配来实现零序电压的平均消除，采取的措施非常简单，即选取一个合适的时间偏移量。搭建了实验平台，对该简化算法进行了实验验证。