A three-phase adaptive harmonic extraction approach for Active Power Filters

This paper introduces an adaptive harmonic current extraction method for use in Active Power Filters (APFs). The method is capable of detecting a selective order of harmonics. This feature is useful where elimination of certain harmonics is of concern. Moreover, the proposed method can successfully detect and track the variations in the frequency of the signal and extract the time-varying harmonics. The theoretical analysis is presented and the performance of the method is evaluated by applying it on a shunt active power filter.