基于磁路耦合的电力电子变压器直流变换技术
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国家重点研发计划资助项目(2017YFB0903300)


Improved DC Converter Based on Magnetic Coupling for Power Electronic Transformer
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    摘要:

    针对模块串联型电力电子变压器中变压器数量多、绝缘要求高的问题,设计了一种基于磁路耦合变压器的多有源桥直流变换器结构,能够提高模块化程度和减少高频变压器端口数目,提升系统功率密度。该变换器采用多磁芯高频变压器,变压器原边具有多绕组结构,对应多模块的串联,以满足输入高电压等级的要求;副边则采用单一绕组,对应全桥或多个全桥电路的并联,以承受副边较大的电流应力。改进的变换器在高压侧保持模块化结构,并且将变压器的磁芯和原边绕组集成到高压模块中,而低压侧使用统一的绕组和变换器,降低了高频变压器的设计难度。最后给出了该拓扑的等效模型和工作原理,并通过实验验证了所提变换器结构的可行性。

    Abstract:

    To overcome the problems in a series connected power electronic transformer such as a large number of transformers and higher insulation requirement, a multiple active bridge converter structure based on magnetic coupling transformer is designed in this paper, which can improve the modulation degree, reduce the number of ports of a high-frequency transformer, and enhance the system' power density. This converter adopts a multi-core high-frequency transformer. It has a multi-winding structure on the primary-side in response to the series-connection of multiple modules, thus satisfying the requirement of high-voltage level. On the secondary-side, it adopts a single winding in response to the full-bridge or the parallel connection of multiple full-bridge circuits, so as to withstand a higher current stress. The improved converter maintains a modular structure on the high-voltage side, in which the core of the transformer and primary winding are integrated. In contrast, it uses a uniform winding and converter on the low-voltage side, thus reducing the difficulty in designing the high-frequency transformer. The equivalent model of this topology and its operating principle are given. In addition, the feasibility of the proposed converter structure was verified by experimental results.

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杨晓梅,虞汉阳,费益军,吉宇,徐晓轶,姚文熙.基于磁路耦合的电力电子变压器直流变换技术[J].电源学报,2021,19(1):1-6

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  • 收稿日期:2019-01-11
  • 最后修改日期:2020-12-30
  • 录用日期:2019-03-14
  • 在线发布日期: 2021-01-21