Active Unbalanced Power Control of Cascaded Power Electronic Transformers

被引：0
|
作者：
Sun Y. [1 ]
Wu C. [1 ]
Fu C. [1 ]
Zhang S. [1 ]
Gao Z. [1 ]
机构：
[1] Key Laboratory of Distributed Energy Storage and Micro-grid of Hebei Province, North China Electric Power University, Baoding
来源：
Fu, Chao (fuchao@ncepu.edu.cn) | 1600年 / Automation of Electric Power Systems Press卷 / 44期
基金：
国家重点研发计划;
关键词：
Active unbalanced power control; Efficiency optimization; Hybrid pulse width modulation (HPWM); Power electronic transformer (PET);
D O I：
10.7500/AEPS20190513001
中图分类号：
学科分类号：
摘要：
Power electronic transformers (PETs) are the key equipment in AC/DC hybrid distribution network. In order to improve the operation efficiency of cascaded PET under the condition of light-load, this paper proposes an efficiency optimization strategy based on active unbalanced power control, which utilizes the unbalanced characteristics of hybrid pulse width modulation (HPWM) technology. By analyzing the power losses of both cascaded H-bridge converter with HPWM and isolated bidirectional DC/DC converter, the operation efficiency model of cascaded PET is established. Based on the efficiency model, the feasibility for improving the overall efficiency of PET through unbalanced power distribution of each module is analyzed. The power stable operation range of each unit with HPWM is derived, and the active unbalanced power control strategy suitable for system efficiency optimization under the condition of light-load is proposed. Finally, the validation of the proposed strategy in comparison with the traditional power balanced control is confirmed by experiments, and the results show that the proposed unbalanced power control can reduce the power loss under the condition of light-load and improve the overall efficiency of PET. © 2020 Automation of Electric Power Systems Press.
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收藏
页码：155 / 163
页数：8
相关论文
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