Conversores CA-CA com alto fator de potência utilizando indutores acoplados.

Abstract

This work addresses the AC-AC converters with the aim of obtaing a high power factor in the grid. For this, this work proposes six converters topologies CA-CA: three-phase converters, single phase-three phase converter and three phase-three phase converters with the rst using a two-level converter as input and the second using a three-level converter as input with reduced number of components. The six converter topologies allows for obtaining adequate grid power factor without any complicated feedback control like those using voltage and current measurements, nor pulsewidth modulation. Coupled inductors are used to reduce the ripple and consequently the total harmonic distortion of input current. This topology can operate either with variable output frequency in applications such as AC drive systems, or with xed output frequency such as UPS (Uninterrupted Power Supply). The con guration that uses a three-level recti er as input with a reduced number of components has been proposed to allow control of the DC-link voltage.