Operação em paralelo de filtros ativos de potência shunt.

Abstract

This work addresses active shunt filters with two or more source operating in parallel. For this possibility of operation, this work intends to propose two topologies active shunt filters operating in parallel: one that uses two filter converters two different buses and the other using two different which share a single bus. The first topology can operate with the two inverters running at frequencies filter converter is controlled only to compensate for the fundamental reac- of the load while the other is controlled to compensate the components active current and harmonic reactive loads. In addition to compensating content harmonic load, this second converter is intended to correct any harmonic disturbances caused by the lower frequency filter. Depending on the load, the reagent filter can process currents higher than the harmonic filter, which implies a reduction in switching losses compared to parallel power active filter pattern that uses only a controlled voltage both to compensate reactive and to reduce harmonics of chain. The second topology aims to contribute in reducing the number of components, in addition to allowing the filter system (composed of two voltage source converters sharing a single bus) can operate at higher load ratings the voltage and current levels of the market devices, since it is possible to divide the compensation current between the two filters. In this type of topology a circulating current between the two filter converters and, currently, this current of ducting is reduced via coupled inductors connected to the filter reactors, but in this work is proposed a control scheme that eliminates this circulating current, in addition to the consequent PWM (Pulse Width Modulation) strategy with this goal.