一种三电平中点钳位变流器改进型载波反相层叠脉宽调制策略

doi:10.19595/j.cnki.1000-6753.tces.191830

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摘要三电平中点钳位变流器载波反相层叠脉宽调制（PODPWM）策略可降低共模电压,但其存在相电压两电平跳变（TLJ）和难以添加中点电位平衡控制策略的缺陷。为解决以上缺陷,该文首先分析PODPWM的基本原理及其等效的空间矢量序列。在此基础上,通过对调制波叠加特定零序分量并在调制波采样值过零点处选择使用特定方向的三角载波,得到可防止TLJ的改进型PODPWM（IPODPWM）及其中点电位平衡控制策略。最后推导IPODPWM作用下的共模电压、直流电压利用率、相电压频谱和开关频率,并设计基于IPODPWM的同步调制方法。仿真和实验结果表明,所提IPODPWM能够避免相电压两电平跳变并控制中点电位平衡,且具有共模电压小、直流电压利用率高的优点。

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	高瞻
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关键词 ：三电平, 载波反相层叠脉宽调制, 两电平跳变, 中点电位平衡, 共模电压

Abstract：The phase opposition disposition PWM (PODPWM) strategy of three-level neutral point clamped converter can reduce the common-mode voltage, but it has the defects of two-level jump (TLJ) and is difficult to design the neutral point voltage balance control strategy. Therefore, this paper first analyzes the basic principle of PODPWM and its equivalent space vector sequence. Accordingly, an improved PODPWM (IPODPWM) and its neutral point voltage balance control strategy for preventing TLJ are obtained by selecting the triangular carrier in a specific direction at the zero crossing point of the modulation wave and superimposing a specific zero sequence component on the modulation wave. Finally, the common mode voltage, DC voltage utilization, phase voltage spectrum and switching frequency under IPODPWM are derived, and a synchronized modulation method based on IPODPWM is designed. Simulation and experimental results show that the IPODPWM proposed in this paper can avoid the two-level jump of phase voltage and control the neutral point voltage balance, and has the advantages of small common-mode voltage and high DC voltage utilization.

Key words： Three-level phase opposition disposition PWM two-level jump neutral point voltage balance common-mode voltage

收稿日期: 2019-12-26

PACS:

TM464

基金资助:国家重点研发计划高速磁浮交通系统关键技术研究课题（2016YFB1200602-20）、国家重点研发计划电力电子变压器及其控制策略研究与应用课题（2017YFB1200901-14）资助项目

通讯作者: 赵鲁男,1984年生,副研究员, 硕士生导师, 研究方向为大功率变流器及高性能电机牵引控制技术。E-mail: zhaolu@mail.iee.ac.cn

作者简介: 高瞻男,1993年生,博士研究生, 研究方向为大功率电力电子变流器控制技术。E-mail: gz1993@mail.iee.ac.cn

引用本文:

高瞻, 李耀华, 葛琼璇, 赵鲁, 王珂. 一种三电平中点钳位变流器改进型载波反相层叠脉宽调制策略[J]. 电工技术学报, 2021, 36(4): 831-842. Gao Zhan, Li Yaohua, Ge Qiongxuan, Zhao Lu, Wang Ke. Improved Phase Opposition Disposition Pulse Width Modulation Strategy for Three-Level Neutral Point Clamped Converter. Transactions of China Electrotechnical Society, 2021, 36(4): 831-842.

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