A Novel Coupled-Inductor Single-Phase Boost DC-AC Inverter for Photovoltaic Systems

Abstract

This paper presents a new single-phase switched coupled-inductor dc–ac inverter featuring higher voltage gain than the existing single-phase qZ-source and semi-Z-source inverters. Similar to the single-phase qZ-source and semi-Z-source inverters, the proposed inverter also has common grounds between the dc input and ac output voltages, which is beneï¬cial especially for photovoltaic inverter systems. The inverter volume and maximum current flowing can be reduced signiï¬cantly through the coupling of all inductors. A theoretical analysis of the proposed inverter is described and a 280-W experimental prototype is built to verify the performance of the inverter.