Third-harmonic modulated power electronics interface with three-phase utility to provide a regulated DC output and to minimize line-current harmonics

Abstract

A novel approach to achieve nearly sinusoidal line current rectification of three-phase utility voltages is presented. The scheme incorporates two step-up DC-DC power converters to modulate the DC-link currents at the third-harmonic frequency. The modulated currents are then circulated through the AC-side of the diode-bridge rectifier, using a zigzag autotransformer, Simulation results for a three-phase, 208 V (line-to-line), 1 kW system are presented. Results from experimental investigations on a laboratory model are included, supporting the concept.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>