NOVEL CASCADED H-BRIDGE POWER ELECTRONIC TRANSFORMER BASED ON TWO-STAGE UNIFIED CONTROL

Tan Fangkun; You Yanfei; Wang Yiyong; Qiao Tingli; Liu Jian

doi:10.19912/j.0254-0096.tynxb.2025-0548

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 425-435. DOI: 10.19912/j.0254-0096.tynxb.2025-0548

NOVEL CASCADED H-BRIDGE POWER ELECTRONIC TRANSFORMER BASED ON TWO-STAGE UNIFIED CONTROL

Tan Fangkun¹, You Yanfei², Wang Yiyong³, Qiao Tingli³, Liu Jian¹

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Abstract

This paper proposes a new cascaded H-bridge power electronic transformer（CHB-PET） based on two-level unified control. The DC/DC isolation stage adopts a resonant push-pull structure, which has fewer switch tubes than the traditional scheme. In addition, the two-level unified control based on the open-loop modulation of the isolation stage reduces the system control complexity and avoids the cascading stability problem in independent control. This paper describes and analyzes the working principle, equivalent model, control design, and system evaluation of the proposed scheme. The evaluation results show that the proposed CHB-PET has improved in terms of cost, efficiency, and stability compared to the traditional scheme, but decreased in terms of intermediate bus voltage balance and device pre-commissioning. Simulation and experimental results verify the effectiveness of the proposed CHB-PET scheme.

Key words

power electronic transformer / cascaded H-bridge / resonant push-pull / unified control / two-stage type / DC/DC isolation level

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Tan Fangkun, You Yanfei, Wang Yiyong, Qiao Tingli, Liu Jian. NOVEL CASCADED H-BRIDGE POWER ELECTRONIC TRANSFORMER BASED ON TWO-STAGE UNIFIED CONTROL[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 425-435 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0548

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