新型不对称三电平四桥臂Z源逆变器的SVPWM算法  

A novel SVPWM algorithm for asymmetrical three-level four-leg Z source inverter

作　　者：周殿祖 魏金成 邱晓初 马黎 刘虹利 居同 

机构地区：[1]西华大学电气与电子信息学院,四川成都610039

出　　处：《电子技术应用》2017年第9期146-149,共4页Application of Electronic Technique

基　　金：四川省电力电子节能技术与装备重点实验室基金资助(szjj2016-049);西华大学研究生创新基金(ycjj2017054)

摘　　要：为了简化三电平逆变器结构,提出了一种新型不对称三电平四桥臂Z源逆变器拓扑结构。与常规对称三电平四桥臂Z源逆变器相比,减少了功率器件的数量,且无需二极管或电容进行箝位,结构简单,有效降低三电平Z源逆变器的成本。针对不对称三电平拓扑结构的逆变器在进行空间矢量调制时因开关矢量缺失,无法通过冗余矢量进行中点电位控制的问题,根据Z源特有的上下直通状态对中点电位的影响,提出了一种基于abc坐标系下的不对称三电平四桥臂逆变器最优SVPWM控制策略,通过控制上下直通时间,在实现直流升压的同时有效抑制了中点电位的偏移。仿真验证了该方法的可行性和有效性。In order to simplify the structure of three-level inverter, a newly topology of asymmetrical three-level four-leg Z-source inverter is proposed. Compared with normal symmetry three-level four-leg Z-source inverter, the cost is reduced effectively for some switches are decreased and no need to clamp with diodes or capacitors. The neutral-point of asymmetry three-level inverter can ' t be controlled, for switching vectors are missing in the space vector modulation. Aiming at the above problem, a superior SVPWM control strategy for asymmetry three-level four-leg inverter based on abc coordinate was proposed, according to the unique straight up and down state of Z source can affect the neutral-point. By adjusting the straight up and down time, the inverter not only maintains the desired boosted ac output voltage but also effectively restrains the neutral voltage offset. Finally, the feasibility and effectiveness of the proposed control strategy is demonstrated by simulation.

关 键 词：Z源 三相四线制 不对称拓扑 中点电位 ABC坐标系 空间矢量调制 

分 类 号：TM464[电气工程—电器]