基于简化SVPWM的Z源三电平逆变器中点电位控制方法  

The Neutral-Point Balancing Method for Z Source Neutral Point Clamped Inverter Based on Simplified SVPWM

作　　者：王伟胜 陈阿莲[1] 柴锦 邢相洋[1] 张承慧[1] Wang Weisheng;Chen Alian;Chai Jin;Xing Xiangyang;Zhang Chenghui(School of Control Science and Engineering Shandong University,Jinan 250061 China)

机构地区：[1]山东大学控制科学与工程学院,济南250061

出　　处：《电工技术学报》2018年第8期1835-1843,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51377101);教育部新世纪优秀人才支持计划(NCET-13-0339)资助项目

摘　　要：针对Z源中点钳位型(NPC)三电平逆变器存在中点电位不平衡问题,在分析中点电位平衡控制机理的基础上,基于简化的三电平空间矢量脉宽调制(SVPWM)技术,提出一种有利于直通信号注入的中点平衡控制方法。该算法通过推导直通占空比、调制比以及平衡因子之间的关系,得到平衡因子的最优解,并实现Z源网络的恒压输出。所提中点平衡控制方法有效抑制了Z源NPC三电平逆变器的中点电位波动,易于实现Z源网络的升压控制,且控制算法简单。仿真及实验结果验证了该方法的有效性。A neutral-point balancing method for Z source neutral point clamped(NPC)three-level inverter,based on simplified three-level space vector pulse width modulation(SVPWM),is proposed in this paper by analyzing the neutral-point balancing principle,which facilitates the injection of shoot through signals.The proposed method figures out the optimal solution of the balancing index,and realizes the constant voltage control of Z source output by deriving the relationship of the shoot-through ratio,modulation index and balancing index.It suppresses the fluctuation of neutral point efficiently,realizes the control of Boost voltage of Z source network conveniently,and simplifies the control algorithm.Simulation and experimental results verify the proposed neutral point control algorithm.

关 键 词：Z源 三电平逆变器 空间矢量脉宽调制 中点平衡 

分 类 号：TM464[电气工程—电器]