A centroid based switching strategy for active power filters

A novel switching strategy for current-fed active power filter applications based on the notion of equal area criteria is presented. In addition, the centroids of both the injected current pulses and the corresponding areas of the continuous harmonic current reference waveform are constrained to occupy the same position in the time domain. In essence the method is a nonuniform sampling technique. The proposed approach provides better performance in terms of improved distortion factor characteristics than equal sampling techniques. From a computational point of view, the centroid-based technique is also far less demanding, by a factor of five, compared to previously published work