カテゴリ: 論文誌(論文単位)グループ名: 【D】産業応用部門（英文）発行日: 2019/09/01タイトル(英語): 500kVA Medium-Frequency Core-Type Amorphous Transformers with Alternately Wound Sheet Winding for Offshore DC Grid著者名: Naoyuki Kurita (Research & Development Group, Hitachi, Ltd.), Tomoyuki Hatakeyama (Research & Development Group, Hitachi, Ltd.), Mamoru Kimura (Research & Development Group, Hitachi, Ltd.), Kenji Nakamura (Graduate school of Engineering, Tohoku University著者名(英語): Naoyuki Kurita (Research & Development Group, Hitachi, Ltd.), Tomoyuki Hatakeyama (Research & Development Group, Hitachi, Ltd.), Mamoru Kimura (Research & Development Group, Hitachi, Ltd.), Kenji Nakamura (Graduate school of Engineering, Tohoku University), Osamu Ichinokura (Graduate school of Engineering, Tohoku University)キーワード: offshore wind farm，multi-winding，proximity effect，lap-joint amorphous core，leakage flux，winding loss要約(英語): 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 500kVA 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 3kHz 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.本誌: IEEJ Journal of Industry Applications Vol.8 No.5 （2019）本誌掲載ページ: 756-766 p原稿種別: 論文／英語電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejjia/8/5/8_756/_article/-char/ja/
