Large‑capacity power electronic transformer with low device usage

Bingbing Hou; Yan Li; Yun Teng

Large‑capacity power electronic transformer with low device usage

Bingbing Hou

Yan Li

Yun Teng

Vol. 25, No. 10, pp. 1820-1832, Oct. 2025

10.1007/s43236-025-01022-4

Cascaded H-bridge

Power electronic transformer

Multi-frequency modulation

Hardware multiplexing

Abstract

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 CHBPET. 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.

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Cite this article

[IEEE Style]

B. Hou, Y. Li, Y. Teng, "Large‑capacity power electronic transformer with low device usage," Journal of Power Electronics, vol. 25, no. 10, pp. 1820-1832, 2025. DOI: 10.1007/s43236-025-01022-4.

[ACM Style]

Bingbing Hou, Yan Li, and Yun Teng. 2025. Large‑capacity power electronic transformer with low device usage. Journal of Power Electronics, 25, 10, (2025), 1820-1832. DOI: 10.1007/s43236-025-01022-4.