基于简化SVPWM的Z源三电平逆变器中点电位控制方法

doi:10.19595/j.cnki.1000-6753.tces.161917

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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。

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	王伟胜
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	邢相洋
	张承慧

关键词 ： Z源, 三电平逆变器, 空间矢量脉宽调制, 中点平衡

Abstract：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.

Key words： Z source three level inverter space vector pulse width modulation neutral point balance

收稿日期: 2016-12-09 出版日期: 2018-04-24

PACS:

TM464

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

通讯作者: 陈阿莲女,1976年生,博士,教授,主要从事可再生能源发电技术、高压大功率多电平变换技术和微电网技术等方面的研究。E-mail: chenalian@sdu.edu.cn

作者简介: 王伟胜男,1988年生,硕士,主要从事多电平逆变器控制技术方面的研究。E-mail: wangweisheng13@126.com

引用本文:

王伟胜, 陈阿莲, 柴锦, 邢相洋, 张承慧. 基于简化SVPWM的Z源三电平逆变器中点电位控制方法[J]. 电工技术学报, 2018, 33(8): 1835-1843. Wang Weisheng, Chen Alian, Chai Jin, Xing Xiangyang, Zhang Chenghui. The Neutral-Point Balancing Method for Z Source Neutral Point Clamped Inverter Based on Simplified SVPWM. Transactions of China Electrotechnical Society, 2018, 33(8): 1835-1843.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.161917 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I8/1835

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