Investigation of Optimal Excitation Waveforms for Medium Frequency Transformers

Zhengda Zhang, Lei Zhang, Jiangchao Qin, Qing Duan, Wanxing Sheng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


Medium frequency transformer (MFT) is the key component for solid state transformer (SST) applications. It provides voltage conversion and galvanic isolation between medium/high-voltage side and low-voltage side. The employment of the MFT can significantly reduce volume and weight of power conversion systems. For high-power medium/high-voltage applications, multilevel converters are the most promising topology and applicable for SST applications. Compared to the conventional full-bridge or half-bridge converters producing square excitation voltage waveforms for the MFT, multilevel converters can generate controllable multilevel excitation voltage waveforms, which potentially improves efficiency and controllability of the SST. In this paper, various excitation voltage waveforms for the MFT are investigated and the optimal multilevel excitation voltage waveforms are identified in terms of total losses and system complexity. Meanwhile, factors affecting core loss and winding loss of the MFT are explored. These factors are applicable for transformer loss analysis under arbitrary excitation waveforms.

Original languageEnglish (US)
Title of host publication2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781479973118
StatePublished - Dec 3 2018
Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
Duration: Sep 23 2018Sep 27 2018


Other10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
CountryUnited States


  • Core loss
  • Medium frequency transformer
  • Multilevel converter
  • Multilevel excitation voltage
  • Power electronic transformer
  • Solid state transformer
  • Winding loss

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Control and Optimization
  • Computer Networks and Communications
  • Hardware and Architecture
  • Information Systems and Management

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