COSTA, L. A. L. A .C; http://lattes.cnpq.br/7839471328269845; COSTA, Louelson Afrânio Leugirdes de Azevedo Cavalcanti.
Resumen:
This work aims to study the current source converters being divided in two parts: Part I - Hbridge
single-phase current source converters; and Part II - X-type current source converters.
The main objective of this work is to develop new topologies that can increase the current
source converter competitiveness. The research is guided towards the development of new
power electronics solutions that can increase the efficiency and/or power density without
compromising the power quality or the operation of the converter. Part I studies H-bridge
single-phase converters solutions with reduced active switch count (asymmetric topologies).
Besides the conventional single-phase topology, three-level and multilevel topologies are
studied. Besides the achievement of the proposed objectives in Part I, the low power density
of single-phase converters motivated the study of the multiphase version of the topologies
studied in Part I. Part II regards multiphase solutions, aiming the reduction of active
switch count and power losses. As done in Part I, the presentation of the new topologies
is structured by inherent characteristics of the conventional multiphase current source
converters. The two-phase X-type current source converter is reviewed, being followed by
the proposal of its generalized solution (multiphase), after that,the assymetrical technique
presented on Part I is applied to the X-type current source converters, resulting in the
asymmetrical X-type topologies. Also a synchronization technique for single-phase ACDC-
AC converters is presented, aiming to reduce the DC-link current oscillation. The
presented topologies are validated via simulation and/or experimental results, showing
their feasibility and improvements when compared to the conventional converters.