Active power filter with soft switching

Abstract

Active power filters have wide application for a control of harmonic currents from nonlinear loads. The paper describes used techniques, operation characteristics and information about an unconventional active power filter with soft switching. The active power filter is connected in parallel to the front end or AC input of the system and corrects all loads directly from the AC line. The power part of the filter is based on progressive IGBT’s, high speed voltage and current sensors and works as soft switched converter. This conception brings the savings of electrical energy and much better EMC properties in comparison with common kinds of parallel active filters. The control methods of the active power filter are described. The control methods have been implemented to DSP control systems and experimentally proved. Experimental results, which are showing the dynamic properties of active power filter, are presented.