METHOD AND SYSTEM FOR DETECTING A FAILED RECTIFIER IN AN AC/DC CONVERTER

摘要

A device for detecting a failed rectifier in an AC/DC converter for converting three-phase AC power to DC power and having its AC side connected to a three-phase AC source and its DC side connected to a DC load, the AC/DC converter including a rectifier circuit including at least three legs, each of the legs connected to a corresponding AC phase and including at least one rectifier, the device including a measuring unit for measuring and sampling AC current for each of the phases and a calculating unit configured to estimate an instantaneous DC current based on the measured instantaneous AC currents during one period of the power supply frequency.