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<p>The cascaded H-bridge (CHB) structure is an efficient technique to enhance the capacity and input voltage of a power electronic transformer (PET). The conventional CHB-PET adopts an input series output parallel (ISOP) structure, which results in greater hardware expenses and a bulkier size. Furthermore, this impedes the progress of engineering and marketing towards high-voltage and large-capacity PET. This paper proposes a new topology to tackle the shortcomings of the CHB-PET. The novel topology uses multi-frequency modulation to achieve hardware multiplexing, reducing the number of power switches, medium-frequency transformers (MFTs), and capacitors incorporated in high-voltage large-capacity PETs. First, this paper provides a comprehensive depiction of the operational principle and mathematical model of the novel topology. Second, the control strategies associated with this topology are discussed in detail. This includes the dual closed-loop vector control implemented on the high voltage side and the voltage balancing control of the cascaded sub-modules. Finally, both simulation and experimental results have validated the accuracy and efficiency of the proposed novel topology and its corresponding control approach.</p>

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Large-capacity power electronic transformer with low device usage

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Bingbing Hou,
  • Yan Li,
  • Yun Teng

摘要

The cascaded H-bridge (CHB) structure is an efficient technique to enhance the capacity and input voltage of a power electronic transformer (PET). The conventional CHB-PET adopts an input series output parallel (ISOP) structure, which results in greater hardware expenses and a bulkier size. Furthermore, this impedes the progress of engineering and marketing towards high-voltage and large-capacity PET. This paper proposes a new topology to tackle the shortcomings of the CHB-PET. The novel topology uses multi-frequency modulation to achieve hardware multiplexing, reducing the number of power switches, medium-frequency transformers (MFTs), and capacitors incorporated in high-voltage large-capacity PETs. First, this paper provides a comprehensive depiction of the operational principle and mathematical model of the novel topology. Second, the control strategies associated with this topology are discussed in detail. This includes the dual closed-loop vector control implemented on the high voltage side and the voltage balancing control of the cascaded sub-modules. Finally, both simulation and experimental results have validated the accuracy and efficiency of the proposed novel topology and its corresponding control approach.