Computational Model of a Two-stage Microinverter With Flyback Active Clamp and Dual Buck

Abstract

This paper presents the computational model of a microinverter for a single-phase grid-connected photovoltaic (PV) system. The presented microinverter consists of a flyback converter with an active-clamp and a voltage multiplier circuit follow for a dual-buck inverter to connect to the grid. The active clamp recycles the energy stored in the leakage inductance of the transformer and reduce the voltage stress in the MOSFET. Dual-buck inverter possesses no shoot-through problems increasing the microinverter efficiency. A two stages control is carry on to implement the maximum power point tracking (MPPT) and grid synchronization. The experiments show that the microinverter is able to perform the MPPT and to inject power to the grid.