Third-harmonic modulated power electronics interface with 3-phaseutility to provide a regulated DC output and to minimize line-currentharmonics

摘要

A novel approach to achieving nearly sinusoidal line currentrectification of three-phase utility voltages is presented. The schemeincorporates two step-up DC-DC power converters to modulate the DC linkcurrents at the third harmonic frequency. The modulated currents arethen reinjected on the AC side of the diode bridge rectifier. Simulationresults for a three-phase, 208 V (line-to-line), 3 kW system arepresented. The sensitivity of the interface to unbalances in varioussystem parameters is included. Results from experimental investigationson a small-scale laboratory model are presented