奚广宇,徐建军,朱景鹏
XI Guangyu,XU Jianjun,ZHU Jingpeng

• 1:闽南理工学院电子与电气工程学院
• 2:东北石油大学电气信息工程学院

摘要(Abstract)：

直流变压器是实现不同电压等级直流系统互联、构建直流电网的核心基础装备。低成本、高效率和轻量化直流变压器的设计方法是当前直流电网关键技术中的核心课题。为此，在MMC半桥模块的基础上，推演出一种基于容性功率转移原理的直流变压器拓扑模型。首先，建立拓扑模型并分析其工作原理。其次，结合直流变压器的设计参数需求，通过时域分析法研究模型的功率转移特性和运行效率特性。然后，利用Simulink平台进行系统性仿真实验，初步验证该模型的工程可行性与理论分析结果。最后，通过100 V/160 W的小功率工程样机实验进一步验证了仿真实验结果。实验结果表明，该模型的功率转移特性可显著降低变压器体积；其频效特性可提高运行效率，并可根据实际工况选择不同方案对系统运行效率进行优化。
DC transformers serve as critical infrastructure for interconnecting DC systems at different voltage levels and constructing DC power grids. The development of cost-effective, high-efficiency, and lightweight DC transformers remains a pivotal research focus in DC grid technologies. This paper proposes a novel DC transformer topology model leveraging the capacitive power transfer principle, building upon MMC half-bridge modules. First, the topological configuration is established with its operational principles analyzed. Subsequently, through time-domain analysis, the power transfer characteristics and operational efficiency are investigated in alignment with design parameter requirements of DC transformers. Systematic simulations conducted on the Simulink platform preliminarily validate the model′s engineering feasibility and theoretical analyses. Finally, experimental verification using a 100 V/160 W low-power prototype corroborates the simulation results. Findings demonstrate that the proposed model′s power transfer characteristics significantly reduce transformer volume, while its frequency efficiency characteristics enhance operational efficiency, enabling optimal scheme selection under practical operating conditions.

关键词(KeyWords)： 容性功率;频效特性;直流变压器;运行效率;MMC;直流电网系统
capacitive power;frequency efficiency characteristics;DC transformer;operational efficiency;MMC;DC power grid

Abstract:

Keywords:

基金项目(Foundation): 黑龙江省自然科学基金(LH2019E016)

作者(Author): 奚广宇,徐建军,朱景鹏
XI Guangyu,XU Jianjun,ZHU Jingpeng

DOI: 10.19585/j.zjdl.202511012

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