Abstract
Three-phase diode-bridge rectifier is a common front end for variable frequency drives/dc-to-dc converters, and is a well-known harmonic source. The rectifier may operate in a dc current continuous or discontinuous mode, which creates a challenge in modelling the harmonic-generation characteristics of such device. This study proposes a method to determine the operational modes of the rectifier under balanced operating conditions and then develops appropriate frequency-domain harmonic models for each mode. The result is an integrated analytical harmonic matrix model for the three-phase diode-bridge rectifier. The matrix model can explicitly show the harmonic coupling effects between the rectifier ac supply voltages and its generated harmonic currents. Simulation and experiments have been done to verify the proposed model. The harmonic model has been applied to analyse the rectifier harmonic generating characteristics and the harmonic interactions between the rectifier and the grid.
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