An Inverter Using Chopper Circuits for Popular Small-Scall Photovoltaic Power System

Abstract

This paper presents a newly developed transformer-less single phase inverter for a photovoltaic (PV) power system. The proposed system consists of two sets of a PV array and Buck-Boost type chopper circuit. A transformer and a inductor which links to a utility grid line are not necessary for the system. The swiching pulses are generated by all digital circuits included a DSP. The experimental data shows that this new inverter can supply the AC power to utility grid line with the power factor nearly unity.