Optimized Vector and Voltage Balancing Algorithm for Cascaded Multilevel Converter Based on Power Electronics Transformer

被引：0
|
作者：
Zhu L. [1 ]
Yang F. [1 ]
Nie J. [1 ]
Lin H. [1 ]
Shu Z. [1 ]
Liu M. [2 ]
机构：
[1] School of Electrical Engineering, Southwest Jiaotong University, Chengdu
[2] Wuhan Haiwang Technology Co., Ltd., Wuhan
来源：
Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Minimum number of switching transition and voltage stress; Multilevel converter; Optimized voltage balancing control; Power electronics traction transformer(PETT); Voltage balancing under the conditions of different unbalanced voltages;
D O I：
10.13336/j.1003-6520.hve.20190948
中图分类号：
学科分类号：
摘要：
The cascade multilevel converter has been widely used in power electronic traction transformer (PETT) system because of its good flexibility and modularity. However, the unbalanced voltages between different power cells is an inherent issue to be urgently solved. In order to solve this problem, an optimized space vector pulse width modulation (SVPWM) voltage balancing algorithm is proposed in this paper. A three-power-cell cascaded multilevel converter is taken as an example to construct three-dimensional (3-D) space vector distribution space and then the redundant space vectors are generated along with. In addition, based on the average voltage, the variation tendency of output voltages at next dwelling time can be determined by the comparison between the dc-link voltages in all power cells and the average voltage. Also the minimum number of switching transition can be guaranteed simultaneously. Compared with the generalized algorithms, the proposed algorithm can not only balance the unbalanced voltages under the conditions of different unbalanced voltages, but also achieve the minimum voltage stress, which can reduce the switching loss, improve the system efficiency and increase its service life. The proposed algorithm is calculable and extensible and is finally verified by simulation and experimental results. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：3257 / 3267
页数：10
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