Hitachi, Ltd.

Shigeru Hatano

Mitsugu Matsutake

Takashi Tsuboi

Kyozo Tachibana

Shozuchi Miura

Yoshio Nozaki

Takao Goto

This invention is applied to a power converter with a converting apparatus comprising one or more units including only controlled rectifiers or combination of controlled rectifiers and non-controlled rectifiers, said converting apparatus being connected with an AC power source, whereby high harmonic currents generated in the AC circuit during commutating periods are reduced. In the present invention, at the commutating period of the converting apparatus, the reactance in the AC circuit of the converter is changed to increase in accordance with change of the AC current of the converting apparatus, so that the change of the AC current during the commutating period is made more slowly thereby reducing high harmonic currents.

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Hitachi, Japan

Shigeru Hatano