Comparison of an active and hybrid power filter devices

This paper provides a comparison between three different topologies, which can be used in current harmonic mitigation. The considered solutions are as follows: a pure active filter, a hybrid filter composed from a series connection of shunt passive and active filters and a newly proposed hybrid filter topology. In this paper the inverter power rating is seen as the main factor of interest, because it roughly determines the overall cost of the device. The comparison analyzes the advantages and drawbacks of the chosen topologies. The principles of operation as well as design considerations of the presented harmonic mitigation devices are presented. Simulations and experimental results confirm the theoretical analysis with a 3 kVA power rated laboratory setup.