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基于模块化多电平换流器的多端口谐振型电力电子变压器
作者:
作者单位:

1.国网江苏省电力有限公司电力科学研究院,江苏省南京市,211103;2.东南大学先进电能变换技术与装备研究所,江苏省南京市,210096

作者简介:

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904700)。


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, Nanjing 211103, China;2.Center for Advanced Power-conversion Technology and Equipment, Southeast University, Nanjing 210096, China

Fund Project:

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

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    摘要:

    适用于直流配电网的电力电子变压器(PET)需要中压直流端口,而现有基于模块化多电平换流器(MMC)结构的PET拓扑可同时提供中压交流、中压直流、低压直流和低压交流端口,但这类PET需要四级电能变换,使得电路结构复杂,体积和重量较大。本文提出了一种适用于直流配电网的多端口MMC谐振型PET拓扑,采用混频调制策略,同时在MMC桥臂支路中并联一组LC谐振支路、中频变压器和全桥电路实现中压直流和低压直流端口的功率解耦输出。该PET拓扑仅使用三级电能变换即可提供所需的多端口特性,具有电路结构简单、体积重量较小等优势。针对该PET拓扑,提供了等效电路分析、控制策略和参数设计方法。最后,通过仿真和实验结果验证了该PET拓扑的可行性。

    Abstract:

    The medium voltage direct current (MVDC) port is essential to power electronic transformer (PET) applied for DC distribution. The available PET topologies based on modular multilevel converter (MMC) can simultaneously provide medium voltage alternating current (MVAC), MVDC, low voltage direct current (LVDC) and low voltage alternating current (LVAC) ports. However, the PET topologies have four power conversion stages, which lead to the complex circuit structure, large volume and weight of PETs. A multi-port PET topology based on MMC with resonant circuit is proposed in this paper. 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 output of the MVDC and LVDC ports. The proposed PET topology can provide the essential multi-port characteristics only with three power conversion stages with the advantages of the simplified circuit structure, smaller size and weight. Moreover, the equivalent circuit analysis, control strategies and parameter design process of the proposed PET are presented in this paper. Finally, the simulation and experimental results verify that the proposed PET is feasible.

    表 10 Table 10
    表 4 Table 4
    表 8 Table 8
    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 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 results of proposed 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 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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引用本文

杨景刚,刘洋,刘瑞煌,等.基于模块化多电平换流器的多端口谐振型电力电子变压器[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20191108001.
YANG Jinggang,LIU Yang,LIU Ruihuang,et al.Multi-port Resonant Power Electronic Transformer Based on Modular Multilevel Converter[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20191108001.

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  • 收稿日期:2019-11-08
  • 最后修改日期:2020-04-25
  • 录用日期:2020-03-04
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