Calculation of Harmonic Currents in a three-Phase Converter with AC Filters under Unbalanced Conditions

摘要

This paper proposes an analytical method for calculating the harmonic currents of a three-phase bridge-con- trolled rectifier with AC filters under unbalanced conditions. The proposed method considers the influence of overlap angles and commutation impedances by taking into account the AC filters, and the analytical equati- ons for the harmonic currents on both the DC and AC sides are derived. The analysis is based on the frequen- cy-domain method and the rectifier switching functions. The validity of the proposed method is confirmed by comparing it with the results of simulations.