Modulation Strategy With Reduced Common Mode Voltage for T-type Three-level Inverter

被引：0
|
作者：
Li S. [1 ]
Tao Y. [1 ]
Ye W. [2 ]
Wang H. [1 ]
Ma X. [1 ]
机构：
[1] Key Laboratory of Intelligent Building & Building Energy Saving, Anhui Jianzhu University, Hefei
[2] Anhui Nari-Jiyuan Power Grid Technology Co., Ltd., Hefei
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 07期
关键词：
common-mode voltage (CMV); imbalance of neutral-point (NP) potential; modulation strategy; small area division; three-level inverter; virtual space vector;
D O I：
10.13336/j.1003-6520.hve.20211637
中图分类号：
学科分类号：
摘要：
Common mode voltage (CMV) and imbalance of neutral-point (NP) potential are the important issues in investigating three-level inverters. Therefore, a modulation method is proposed, which can be adopted to achieve CMV suppression and NP potential balance in the range of full modulation ratio and full power factor. In this method, the basic vectors with low CMV are selected to synthesize virtual vectors, which suppress the CMV within the range of ±Udc/6. The optimized basic vectors are formed into virtual vectors, which further eliminates the problem of large fluctuations in the NP potential. By improving the small area division method, the basic vectors which are comprised in the virtual vectors in each small area are smoothly switched, avoiding the direct switching of state P and state N between adjacent basic vectors. Each small area contains a virtual vector with adjustable amplitude. By adjusting the amplitude of the virtual vector, the action time of the basic vector in each carrier cycle is changed to control the average current flowing out of the NP of the DC side. Finally, all small areas have good midpoint potential balance control ability. The experimental results show that the CMV of the inverter is limited to ±Udc/6, and the neutral point potential imbalance can be eliminated. Research on the modulation strategy with low output CMV, small NP potential fluctuation and NP potential adjustment capability is of great significance to three-level inverters. © 2022 Science Press. All rights reserved.
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页码：2826 / 2839
页数：13
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