PV Micro-Inverters as Modules of Multilevel Converters
The increasing use of renewable energies, especially photovoltaic energy generation, has motivated research in the area of power electronics in order to optimize the integration of these sources into the conventional electric system. In general, photovoltaic systems are connected to the AC grid and, for this purpose, use voltage Inverters. Several topologies can be used for this, among them, the Micro-Inverters and the Multi-Modular Converters, both having their advantages and disadvantages. Therefore, the objective of this paper is to integrate the concepts of both technologies in a Modular Multilevel Converter in which each module is given by a Micro-Inverter. The proposed system is modeled in PSIM and simulation results show that the proposed system presents satisfactory results even under conditions of total or partial shading of PV modules.