A Single-Phase Hybrid Active Power Filter Connected to a Photovoltaic Array

Due to the proliferation of nonlinear and switching loads from power electronics converters, there is an increasing concern to control and reduce the harmonic currents in distribution power lines. These types of loads draw nonsinusoidal currents from the mains, causing harmonic distortion. One of the methods to reduce the problem is by using the power electronics approach. This paper presents a single-phase hybrid active power filter connected to a photovoltaic array. The uniqueness of the proposed scheme is the fact that it improves the filtering performance of the conventional shunt active power filter, as well as simultaneously supplies the power from the photovoltaic array to the load. The compensation current reference estimation is based on the extension instantaneous reactive-power theorem. Experimental results obtained from a laboratory system that verifies the viability and effectiveness of the proposed scheme are presented.