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Passive Components Size Reduction in Solid-State Transformers for EV Fast Charging System

Abstract

Abstract—This paper discusses the application of the concept
of solid-state transformer (SST) to electric vehicle (EV) fast
charging system, which can realize a large volume reduction
from the traditional system based on line frequency transformer
(LFT). For a 6.6 kV–800 V / 200-kW AC to DC SST, sizes of
passive components are analyzed and an oscillating power control
(OPC) is discussed to decrease the DC-link capacitance and the
volume of the capacitors in the SST. An optimization based on
the model of medium frequency transformer (MFT) to find the
minimal total volume of MFTs with a given core is performed.
As one of the system level parameters, the number of cascade
and resulting unit power capacity are treated as a parameter for
the optimization. The results indicate that increasing unit power
capacity for the given core shape results in total volume reduction
without major power loss increase.

Category

Academic chapter/article/Conference paper

Language

English

Author(s)

Affiliation

  • University of Tsukuba
  • SINTEF Energy Research / Energisystemer

Year

2019

Publisher

IEEE

Book

IEEE International Conference on DC Microgrids - ICDCM 2019

ISBN

978-1-7281-3491-8

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