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

1.Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing211103, China;2.Center for Advanced Power-conversion Technology and Equipment, Southeast University, Nanjing210096, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904700).

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    Abstract:

    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.

    表 10 Table 10
    表 4 Table 4
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    表 3 Table 3
    表 7 Table 7
    表 17 Table 17
    表 18 Table 18
    表 15 Table 15
    表 14 Table 14
    表 11 Table 11
    表 16 Table 16
    表 1 Table 1
    表 12 Table 12
    图1 多端口MMC谐振型PET拓扑Fig.1 Multi-port resonant PET topology based on MMC
    图2 PET功率解耦支路Fig.2 Power decoupling branches of PET
    图3 所提PET的等效电路Fig.3 Equivalent circuit of the proposed PET
    图4 混频调制策略Fig.4 Mixed-frequency modulation strategy
    图5 PET实验波形Fig.5 Experimental waveforms of PET
    图 MMC桥臂中频方波电压对PET端口电压影响Fig. Effect of square wave voltage of MMC arm on PET port voltage
    图 等效DC/DC谐振变换器Fig. Equivalent DC/DC resonant converter
    图 本文所提PET拓扑电能变换示意图Fig. Schematic diagram of power conversion of proposed PET
    图 PET整体控制策略Fig. Overall control diagram of the proposed PET
    图 谐振电感结构Fig. Structure of resonant inductor
    图 等效DC/DC谐振变换器Fig. Equivalent DC/DC resonant converter
    图 本文所提PET拓扑电能变换示意图Fig. Schematic diagram of power conversion of proposed PET
    图 PET整体控制策略Fig. Overall control diagram of the proposed PET
    图 谐振电感结构Fig. Structure of resonant inductor
    图 单相PET原理图Fig. Schematic diagram of proposed single phase PET
    图 PET实验平台Fig. Experimental platform of proposed PET
    表 9 Table 9
    表 5 Table 5
    表 2 Table 2
    表 6 Table 6
    表 13 Table 13
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Get Citation

YANG Jinggang,LIU Yang,LIU Ruihuang,et al.Multi-port Resonant Power Electronic Transformer Based on Modular Multilevel Converter[J].Automation of Electric Power Systems,2020,44(13):123-134.DOI:10.7500/AEPS20191108001

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History
  • Received:November 08,2019
  • Revised:February 29,2020
  • Adopted:
  • Online: July 03,2020
  • Published: