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1. (WO2015045530) POWER CONVERSION DEVICE AND CONTROL METHOD

Pub. No.:    WO/2015/045530    International Application No.:    PCT/JP2014/066760
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Thu Jun 26 01:59:59 CEST 2014
IPC: H02M 7/48
H02P 27/06
Applicants: HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD.
株式会社日立産機システム
Inventors: ARAO Yusuke
荒尾 祐介
Title: POWER CONVERSION DEVICE AND CONTROL METHOD
Abstract:
There are cases in which a current is determined to have increased rapidly despite the fact that said current is not increasing. This power conversion device is provided with the following: a power conversion unit that converts power to desired AC power; a current detector that detects the output current coming from the power conversion unit; a current detection unit that acquires, as output-current data, the output current detected by the current detector; a current-delay computation unit that applies a low-pass filter to the output-current data acquired by the current detection unit; a current prediction unit that, on the basis of the output-current data acquired by the current detection unit and the output-current data to which a low-pass filter was applied by the current-delay computation unit, generates actual-current data predicting the actual current flowing through the power conversion unit; and an output-current evaluation unit that evaluates the output current on the basis of the actual-current data generated by the current prediction unit. If the actual-current data generated by the current prediction unit satisfies a prescribed condition, the output-current evaluation unit shuts off the output of the power conversion unit.