Sistemas de conversão utilizando conversores estáticos trifásicos interconectados.

Abstract

Static power converters are largely used in industry. Among other applications, these equipments can be used to drive variable speed loads and to start up motors softly. Due to its importance, the static power converters are being studied and improved to drive motors in high voltage and current levels, keeping the limits of harmonic distortion in accordance with the standards. In this work, two topologies of static power converters built from the interconnection of conventional static power converters are presented: the Interconnected Three-phase Converter (ITC) and the Interconnected Hexaphase Converter (IHC). The following aspects are discussed for both topologies: modelling of the circuits, development of PWM strategies, load/grid current control, circulating current control, DC-link voltage control, total harmonic distortion analysis, and switching losses calculation in IGBT. A comparison between the interconnected converters and the conventional topologies is shown. Finally, experimental results are presented.