PV micro inverter topology using soft switching half-wave cycloconverter

Abstract

This paper deals with the development of a micro inverter for single phase photovoltaic applications which is suitable for conversion from low voltage DC to high voltage AC. The circuit topology is based on half-wave cycloconverter and grid connected microinverter with a very less number of conversion stages and passive components. To interface the full bridge converter to the half-wave cycloconverter a high-frequency transformer and series-resonant tank are used- To determine the average output power of the inverter, a steady state analysis is used and to control the output power of the inverter, phase-shift power modulation is used. The operational characteristic is analyzed and multidimensional control technique is used to achieve high efficiency voltage gain, quality factor and phase shift of the inverter. The micro inverter and converter has light weight and reduced switch count. The operation of proposed microinverter in grid-connected mode is validated using MATLAB simulation.