A neutral point potential drift control method for NPC three-level inverter

被引：0
|
作者：
Wu L. [1 ]
Qi X. [1 ]
Shi X. [4 ]
Su T. [2 ]
Tao Y. [3 ]
机构：
[1] School of Mechanical Engineering, University of Science and Technology Beijing, Beijing
[2] Institute of Microelectronics of the Chinese Academy of Sciences, Beijing
[3] Research Institute of Aero-Engine, Beihang University, Beijing
[4] Shunde Graduate School, University of Science and Technology Beijing, Foshan
来源：
High Technology Letters | 2021年 / 27卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Inverter bus voltage stabilizing; Neutral-point potential drift; Small vector output; Space voltage vector; Three-level inverter;
D O I：
10.3772/j.issn.1006-6748.2021.03.004
中图分类号：
学科分类号：
摘要：
The output current harmonic distortion of a three-level inverter is less than the traditional two-level inverter. The voltage stress of the semiconductor switch is low. A neutral point potential drift control method is proposed to solve the problem of the neutral point potential drift of the three-level inverter. The interaction mechanism between the neutral point potential and the space voltage vector is presented. The small vector output by the inverter is found to be the root cause of the midpoint potential drift. It is found that the fluctuation of the midpoint potential could be suppressed by increasing the capacitance value of the inverter bus voltage stabilizing capacitor. Furthermore, it inhibits the fluctuation of the midpoint potential. The experimental results verify the efficiency and precision of the proposed method. Copyright © by HIGH TECHNOLOGY LETTERS PRESS.
引用
收藏
页码：256 / 261
页数：5
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