Modeling and Control of a Multiport Power Electronic Transformer (PET) for Electric Traction Applications

Chunyang Gu, Zedong Zheng, Lie Xu, Kui Wang, Yongdong Li

Research output: Journal PublicationArticlepeer-review

180 Citations (Scopus)


This paper proposes a multiport power electronic transformer (PET) topology with multiwinding medium-frequency transformer (MW-MFT) isolation along with the associated modeling analysis and control scheme. The power balance at different ports can be controlled using the multiwinding transformer's common flux linkage. The potential applications of the proposed multiport PET are high-power traction systems for locomotives and electric multiple units, marine propulsion, wind power generation, and utility grid distribution applications. The complementary polygon equivalent circuit modeling of an MW-MFT is presented. The current and power characteristics of the virtual circuit branches and the multiports with general-phase-shift control are described. The general current and power analysis for the multiple active bridge (MAB) isolation units is investigated. Power decoupling methods, including nonlinear solution for power balancing are proposed. The zero-voltage-switching conditions for the MAB are discussed. Control strategies including soft-switching-phase-shift control and voltage balancing control based on the power decoupling calculations are described. Simulations and experiments are presented to verify the performance of the proposed topology and control algorithms.

Original languageEnglish
Article number7066962
Pages (from-to)915-927
Number of pages13
JournalIEEE Transactions on Power Electronics
Issue number2
Publication statusPublished - 1 Feb 2016
Externally publishedYes


  • Power electronic transformer
  • electric traction
  • multi-winding medium frequency transformer
  • multiple active bridge
  • power decoupling

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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