Research on the Architecture of Highly Reliable Self-powered System for Modular Multilevel Medium Voltage DC Converters

被引：0
|
作者：
Li C. [1 ]
Fang H. [2 ]
Gong Q. [3 ]
Li C. [1 ]
Li W. [3 ]
He X. [3 ]
机构：
[1] Zhejiang University, University of Illinois, Urbana-Champaign Institute, Zhejiang Province, Haining
[2] Polytechnic Institute, Zhejiang University, Zhejiang Province, Hangzhou
[3] College of Electrical Engineering, Zhejiang University, Zhejiang Province, Hangzhou
[4] École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2024年 / 44卷 / 02期
基金：
国家重点研发计划; 浙江省自然科学基金;
关键词：
medium-voltage direct power supply; modular multi-level DC converter; self-powered; sub-module capacitor voltage balancing;
D O I：
10.13334/j.0258-8013.pcsee.223249
中图分类号：
学科分类号：
摘要：
Modular multi-level DC converters have received extensive attention from industry and academia with the rapid development of large-capacity medium-voltage DC power distribution technology. However, achieving highly reliable auxiliary power supply is one of the key technical bottlenecks to realize the application of DC converters in medium-voltage DC power distribution scenarios. To this end, this paper proposes a highly reliable self-powered system architecture for modular multi-level medium-voltage DC converters. The architecture realizes the medium-voltage direct power supply of the central controller and sub-modules, so that no additional low-voltage DC power supply is required, and the system startup speed is greatly improved. Based on this architecture design, the auxiliary power supply of the sub-module controller and the bypass switch for modular multi-level medium-voltage DC converters have achieved three times redundancy, which improves the fault-tolerant operation capability of the system. A voltage balancing method of sub-module capacitors based on the autonomous control of auxiliary power supply in the pre-charging stage is proposed, which ensures the reliable pre-charging of the modular multi-level DC converter. Finally, the feasibility of the proposed auxiliary power supply system architecture is verified by experiments. ©2024 Chin.Soc.for Elec.Eng.
引用
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页码：670 / 681
页数：11
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