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1. (WO2018127945) POWER CONVERTER

Pub. No.:    WO/2018/127945    International Application No.:    PCT/JP2017/000035
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Thu Jan 05 00:59:59 CET 2017
IPC: H02M 7/12
H02M 7/06
H02M 7/08
Applicants: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
東芝三菱電機産業システム株式会社
Inventors: NAKANO, Toshihide
中野 俊秀
Title: POWER CONVERTER
Abstract:
A power converter (100) comprises a three-level converter (6), an inverter (3), a diode rectifier (2), and a controller (7). The three-level converter (6) is configured to convert an alternating-current voltage supplied from an alternating-current power supply (1) via an alternating-current line into a direct-current voltage. The inverter (3) is configured to convert, into an alternating-current voltage, the direct-current voltage supplied from the three-level converter (6) via a direct-current positive bus bar (13), a direct-current negative bus bar (14), and a direct-current neutral bus bar (15), and supply this alternating-current voltage to a load (4). The diode rectifier (2) is connected in parallel to the three-level converter (6) between the alternating-current line and the direct-current positive bus bar (13) and direct-current negative bus bar (14). The controller (7) is configured: to control the three-level converter (6) such that the direct-current voltage supplied to the inverter (3) becomes a reference voltage higher than the direct-current voltage to be output from the diode rectifier (2); and also to gate block the three-level converter (6) during failure of the three-level converter (6).