Transformer-Less Grid-Connected Photovoltaic Inverter

Abstract

The increasing use of inverters in microgrids and Photovoltaic generation systems has made it more crucial than ever to achieve low-distortion, high-quality power export from inverters. The presence of harmonics in the grid's pre-existing voltage/current distortion will result in poor power quality. A well-designed inverter impacts minimizing the percentage of total harmonic distortion (THD) in the power supplied to the grid. This paper proposes H6 inverter topology in comparison with conventional H4(Full-bridge) topology to reduce the grid disturbance in the context of THD and maintain good waveform quality. The Transformer-less Single-Phase Grid-Connected photovoltaic inverter using MATLAB/Simulation is implemented. The depreciation of %THD and improvement in the power factor in the proposed system emphasize its prominence in practical implementation.