Filtros ativos híbridos ressonantes

Abstract

This work comes with a new arrangement proposition to the already known Hybrid Active Series Power Filter. Differently of the standard hybrid active series power filter that are composed by an active filter connected in series with tuned passive filters, the new proposed topology connects the active filter just to a passive element, a capacitor. In this way, by the active impedance implementation, major inductive, one or more resonant frequencies are established, obtaining therefore a resonant hybrid active filter. The major issues concerned about the hybrid topology proposed, based on Modified Synchronous Reference Frame controllers, are presented. The source harmonic current mitigation is analyzed by implementation of three distinct active impedances plus the fundamental frequency active impedance. The chosen harmonic frequencies to active impedance implementation are the third, the fifth and the seventh harmonic frequencies. In the literature, to the present moment, a sort of application has been proposed related to hybrid active series filers. However, all of them are restricted to the tuned passive filter associated to active filter. The objective of this work is to look toward the conception of hybrid active filters eliminating the dependency of pre-tuned passive cells, reducing the implementation cost, overcoming consecutively the passive filter poor performance faced to the changing of harmonic content in electric power systems. Experimental results concerning harmonic mitigation by a single phase prototype developed are presented and analyzed.