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1. (WO2018008137) POWER CONVERSION DEVICE AND WIND POWER GENERATION SYSTEM

Pub. No.:    WO/2018/008137    International Application No.:    PCT/JP2016/070206
Publication Date: Fri Jan 12 00:59:59 CET 2018 International Filing Date: Sat Jul 09 01:59:59 CEST 2016
IPC: H02M 7/48
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: KOMINAMI Tsutomu
小南 勉
GOTOH Kengo
後藤 研吾
MORITA Hiroshi
森田 裕
KIKUCHI Akira
菊池 輝
Title: POWER CONVERSION DEVICE AND WIND POWER GENERATION SYSTEM
Abstract:
In order to ensure an insulation distance and a creepage distance between different voltage levels in a power converter, conventional techniques using air insulation have been causing the power converter to increase in size as an input voltage and an output voltage increase. There has also been a problem that, when the air insulation is changed to oil insulation to reduce the size of the power converter, it becomes difficult to replace components. A power converter is configured by dividing components (a semiconductor element, a smoothing capacitor, a semiconductor element driving circuit, and a wire or a metal conductor plate for connecting each of the components) constituting the power converter, housing the divided components in a plurality of individual boxes filled with an insulating oil, and connecting the individual boxes with each other. The power converter is housed in a chassis box filled with an insulating oil, thereby reducing the size of the power converter. Dividing the power converter into the plurality of individual boxes improves the workability of component replacement.