Conversores estáticos CA-CC-CA trifásicos em paralelo com compartilhamento de braços.

Abstract

Parallel systems with static converters become more and more important in the world of power electronics, mainly due to the increase of reliability and quality of voltage and current signals from the system. Even though the parallel systems are well known in the literature, many of the studies dealing with parallel systems, only with recti ers or only with inverters. Recently, have been studied some static converters AC-DC-AC parallel con gurations. In this paper, six new static converter AC-DC-AC three-phase to three-phase topologies with a reduced number of legs are proposed. For each topology will be considered the following aspects: (i) dynamic modelling of the con- guration (ii) control of the grid current, dc-link voltage and the load voltage; (iii) PWM strategy and (iv) study of the impact of using single, double or six carriers-based PWM in the system performance. Moreover, the proposed topologies are able to reduce: the harmonic distortion of the grid current and load voltage, the power losses of high frequency of dc-link and the power losses in semiconductors (IGBTs and diodes) compared to conventional topologies under the same operating conditions. Finally, simulation and experimental results are presented and compared to validate the proposed topologies.