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1. (WO2018131086) POWER CONVERSION DEVICE

Pub. No.:    WO/2018/131086    International Application No.:    PCT/JP2017/000598
Publication Date: Fri Jul 20 01:59:59 CEST 2018 International Filing Date: Thu Jan 12 00:59:59 CET 2017
IPC: H02M 7/493
H02M 7/48
Applicants: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
東芝三菱電機産業システム株式会社
Inventors: MORITO, Chikara
森藤 力
SUZUKI, Hiromitsu
鈴木 寛充
Title: POWER CONVERSION DEVICE
Abstract:
Provided is a power conversion device used in an electric motor drive system having inverters connected in parallel, said power conversion device identifying a laid cable impedance by using a test pulse and optimizing a cross current suppression control gain, thereby eliminating a coupling reactor. An electric motor drive system 1 has A- and B-bank inverters 20A, 20B, the outputs of which are connected in parallel, wherein: before operation, a test pulse is output to the A- and B-bank inverters from a drive control unit 30 equipped with a PWM controller 33; a laid cable impedance is identified from the DC voltage Vdc and the response currents IA, IB obtained when the test pulse is output; an adjustment gain is calculated from the ratio of the laid cable impedance to a specified cable impedance and is optimized by multiplying a proportional gain KP; an on-delay value based on the already optimized adjustment gain GL×KP is calculated during the operation; and a gate signal is output that is corrected by the on-delay value calculated for the corresponding inverter gate.