500 kVA medium-frequency core-type amorphous transformers with alternately wound sheet winding for offshore DC grid

Naoyuki Kurita, Tomoyuki Hatakeyama, Mamoru Kimura, Kenji Nakamura, Osamu Ichinokura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This paper describes a low winding loss design methodology to develop a real-scaled medium frequency transformer (MFT) for an isolated DC-DC converter to be used in a DC-interconnected offshore wind farm system. We assembled a core-type 500 kVA MFT consisting of a lap-joint amorphous wound core and windings with a primary Cu sheet and divided secondary Cu sheets, wound alternately in turns. Then, we compared its loss performance with that of a conventionally designed MFT. The alternately wound winding structure suppressed the medium-frequency proximity effect between the Cu sheets and the in-plane eddy current due to the fringing flux crossing the edges of the sheets and fixtures, and the winding loss at 3 kHz was 61% lower than that of the conventional MFT. In addition, we propose and discuss an accurate estimation method for the winding loss of core-type MFTs, considering the in-plane eddy current loss at the edge of the Cu sheets based on the finite element method.

Original languageEnglish
Pages (from-to)756-766
Number of pages11
JournalIEEJ Journal of Industry Applications
Volume8
Issue number5
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Lap-joint amorphous core
  • Leakage flux
  • Multi-winding
  • Offshore wind farm
  • Proximity effect
  • Winding loss

ASJC Scopus subject areas

  • Automotive Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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