Multi-port Resonant Power Electronic Transformer Based on Modular Multilevel Converter

被引：0
|
作者：
Yang J. [1 ]
Liu Y. [1 ]
Liu R. [1 ]
Yuan Y. [1 ]
Ma D. [2 ]
Chen W. [2 ]
机构：
[1] Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing
[2] Center for Advanced Power-conversion Technology and Equipment, Southeast University, Nanjing
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2020年 / 44卷 / 13期
基金：
国家重点研发计划;
关键词：
Mixed-frequency modulation; Modular multilevel converter; Power decoupling; Power electronic transformer; Resonant circuit;
D O I：
10.7500/AEPS20191108001
中图分类号：
学科分类号：
摘要：
The medium voltage direct current (MVDC) port is essential to power electronic transformer (PET) applied to DC distribution network. The available PET topologies based on modular multilevel converter (MMC) can simultaneously provide four kinds of ports: medium voltage alternating current (MVAC), MVDC, low voltage direct current (LVDC) and low voltage alternating current (LVAC). However, the PET topologies need four power conversion stages, which lead to the complex circuit structure, large volume and heavier weight of PETs. A multi-port resonant PET topology based on MMC applied to DC distribution network is proposed. With a mixed-frequency modulation strategy, a set of LC resonant branches, medium-frequency transformers and full-bridge circuits are connected in parallel in the MMC bridge arm branch to realize the power decoupling outputs of the MVDC ports and LVDC ports. The proposed PET topology can provide the essential multi-port characteristics with only three power conversion stages, and has the advantages of the simplified circuit structure, smaller size and lighter weight. Moreover, the equivalent circuit analysis, control strategy and parameter design process of the proposed PET are presented. Finally, the simulation and experimental results show that the proposed PET topology is feasible. © 2020 Automation of Electric Power Systems Press.
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页码：123 / 134
页数：11
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