Implementation of a PV Module–Integrated Dual-Boost DC-AC Converter–Based Isolated Microinverter for Grid-Connected Application

Abstract In this article, a Photovoltaic (PV) array–integrated dual-boost dc-ac converter operating as an isolated single-phase microinverter is presented to track and export the power produced on the PV array to grid and load. The single-phase microinverter, which utilizes the cascaded connection of the dc-dc converter, rectifier, and an inverter, offers high boosting gain with low-duty ratio. However, the cascaded connection of the converters offers low conversion efficiency that is due to the usage of an increased number of power-switching devices. The proposed isolated dual-boost microinverter is designed to offer high Maximum Power Point Tracking efficiency, high conversion ratio, and high conversion efficiency with a reduced number of switches and passive elements. The design considerations and six different modes of the microinverter are presented. The simulated and experimental results are presented to investigate the proposed dual-boost dc-ac converter–operated microinverter.