Filtros ativos de potência universal baseado em topologias não convencionais de conversores estáticos.

Abstract

This work has five universal active power filter topologies for three-phase systems in order to compensate for disturbances caused by the use of non-linear loads, reactive power, as well as disruption of the network (sag/swell and harmonics). The proposed systems are a combination of series and shunt active filters. Two of these topologies are universal filters without the series isolation transformer, using one (configuration I) and two (configuration II) dc-links, they are suitable for applications where size is a critical issue, since the weight, size and cost associated with the transformer are significant. The other two topologies are composed of three-phase inverters (9 legs), the first uses floating capacitor on the dc-link in series filter (configuration III), the second (configuration IV) uses a series combination of two filters (on the grid side) and a shunt filter. The complete system control, including PWM strategies will be developed and comparisons between the proposed and conventional universal active power filters were performed. The simulation and experimental results ware presented to validate the theoretical approaches.