Efficiency optimization design of DC-DC solid state transformer based on modular multilevel converters

Lei Zhang, Zhe Zhao, Jiangchao Qin

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

5 Scopus citations

Abstract

In the recent decade, the solid-state transformer (SST) has been extensively investigated for the distribution systems. The basic idea of SST is to reduce the volume and weight of power transformer, as well as improve controllability and power quality of power systems. Among the existing SST topologies, modular multilevel converters (MMCs)-based SST is very promising due to its modularity and scalability, specifically for medium/high-voltage applications. Compared to the conventional full-bridge or half-bridge converters, MMC can generate controllable multilevel excitation ac voltage and potentially improve efficiency and controllability. In this paper, to minimize power losses, an optimization design strategy is proposed based on the optimum multilevel excitation voltage and optimum blocking voltage of semiconductor devices. The power losses are evaluated and compared based on semiconductor losses and core losses. The study results show that 1.2 kV and 1.7 kV Si IGBTs and 1.2 kV SiC MOSFET produce the minimum power losses under the selected multilevel excitation voltage. The study results also show the MMC-SST with the proposed optimization strategy has higher efficiency than the SST based on cascaded configuration.

Original languageEnglish (US)
Title of host publication2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3508-3513
Number of pages6
Volume2017-January
ISBN (Electronic)9781509029983
DOIs
StatePublished - Nov 3 2017
Event9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 - Cincinnati, United States
Duration: Oct 1 2017Oct 5 2017

Other

Other9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
CountryUnited States
CityCincinnati
Period10/1/1710/5/17

Keywords

  • Medium/high-frequency transformers
  • Modular Multilevel Converter (MMC)
  • Optimization design
  • Optimum blocking voltage
  • Optimum multilevel excitation voltage
  • Solid State Transformer (SST)

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Renewable Energy, Sustainability and the Environment
  • Control and Optimization

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  • Cite this

    Zhang, L., Zhao, Z., & Qin, J. (2017). Efficiency optimization design of DC-DC solid state transformer based on modular multilevel converters. In 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017 (Vol. 2017-January, pp. 3508-3513). [8096626] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2017.8096626