Flatness-based control of a boost inverter for PV microinverter application

The boost inverter is an attractive solution for photovoltaic (PV) microinverters since it is a single stage architecture. Indeed, in comparison, most of the microinverters topologies consist of two-stage structures, a DC-DC converter for voltage elevation and an inverter for grid connection, resulting in a lower efficiency. The boost inverter consists of two DC-DC boost converters connected in differential mode to the grid. However, due to its high non-linearity behavior the control of this topology is a complex task. To solve this problematic a flatness-based control scheme of the boost inverter is proposed. Simulation results are provided to validate the good behavior of the proposed control scheme for a grid connected PV microinverter.