A New Control Structure for Hybrid Power Filter to Reduce the Inverter Power Rating

This paper describes a control structure of a hybrid power filter, which can be used in current harmonic mitigation. The selected hybrid filter topology consists of an active power inverter connected between the capacitor and inductor of a shunt passive filter. In this paper the inverter power rating is seen as the main factor of interest, because it determines the overall cost of the installation. The aim of the proposed control is to reduce the amount of power losses in the inverter by using a current loop that controls the fundamental reactive power. The principles of operation as well as design considerations of the presented harmonic mitigation solution are presented. Several comparisons are given to describe the advantages and limitations of the proposed topology. Experimental results confirm the theoretical analysis on a laboratory setup with a 7 kVA power inverter