一种基于载波实现的三电平中点钳位变流器零矢量首发SVPWM方法

doi:10.19595/j.cnki.1000-6753.tces.190550

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摘要三电平变流器零矢量首发SVPWM（SVPWM-BWZ）策略在低调制比下具有能满足最小脉宽限制、可产生任意小线电压值的优点,故适用于变频调速系统的起动和低速轻载状态,但其实现方式较为复杂。针对这一问题,该文首先介绍了SVPWM-BWZ策略的基本原理,分析了SVPWM-BWZ策略与载波脉宽调制策略之间的调制波等效关系。在此基础上提出基于载波实现的SVPWM-BWZ（CBSVPWM-BWZ）方法及相应的中点平衡控制策略,并推导CBSVPWM-BWZ作用下三电平变流器输出相电压的频谱、脉宽特性和功率器件的开关频率。最后利用仿真和实验对CBSVPWM-BWZ的有效性进行了验证,结果表明CBSVPWM-BWZ可完全等效传统SVPWM- BWZ策略,其在低调制比下具备较好的调制效果且无需计算各空间矢量作用时间,实现更为方便。

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关键词 ：三电平, 空间矢量脉宽调制, 零电压矢量, 载波脉宽调制, 中点平衡控制

Abstract：The space vector PWM begins with the zero voltage vector (SVPWM-BWZ) for the three-level converter has the advantages of satisfying the minimum pulse width limitation and generating arbitrarily small line voltage at a low modulation index. It is suitable for start-up and low-speed status of variable frequency speed regulation system, but its implementation is complex. To solve this problem, the basic principle of SVPWM-BWZ is introduced in this paper firstly, then the equivalent relationship between SVPWM-BWZ and carrier-based PWM is analyzed. Accordingly, a carrier-based SVPWM-BWZ (CBSVPWM-BWZ) method and the corresponding neutral point alancing control strategy are proposed. The output phase voltage spectrum and pulse width characteristics of three-level converter and the switching frequency of power devices under CBSVPWM-BWZ are derived. Finally, the effectiveness of the proposed method is verified by simulation and experiments. The results show that the proposed method is completely equivalent to the traditional SVPWM-BWZ strategy. It has better modulation effect at low modulation ratio and does not need to calculate the duration of the space vector, which is more convenient to implement.

Key words： Three-level space vector PWM zero voltage vector carrier-based PWM neutral point balance control

收稿日期: 2019-05-07

PACS:

TM464

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, 葛琼璇, 李耀华, 赵鲁, 张波. 一种基于载波实现的三电平中点钳位变流器零矢量首发SVPWM方法[J]. 电工技术学报, 2020, 35(10): 2194-2205. Gao Zhan, Ge Qiongxuan, Li Yaohua, Zhao Lu, Zhang Bo. A Carrier-Based SVPWM Begins with the Zero Voltage Vector for Three-Level Neutral Point Clamped Converter. Transactions of China Electrotechnical Society, 2020, 35(10): 2194-2205.

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