A flyback-CCM inverter scheme for photovoltaic AC module application

Abstract

This paper presents an investigation into the use of a flyback-based grid-inverter operating in continuous conduction mode (CCM) for a photovoltaic AC module application. Detailed analysis of operation, including evaluation of achievable power factor and current stresses, is presented. A design approach for the flyback-CCM inverter is presented and discussed. The performance of the proposed inverter is compared with a benchmark flyback-DCM (discontinuous conduction mode) scheme. Simulation results demonstrate the advantages and limitations of the proposed scheme. The impact of the bifurcation and subharmonics observed at low power levels are discussed. A mitigation method is proposed for this problem and its operation verified. © Institution of Engineers Australia, 2009.