Desenvolvimento de um microinversor monofásico para sistema fotovoltaico conectado na rede elétrica de baixa tensão

Abstract

The objective of this work is the construction of a complete single-phase power electronic converter for grid connection of low voltage distribution powered by photovoltaic panels.Photovoltaic panels generates a DC voltage that varies between 20 and 50V, depending on the type of panel and presence or absence of connection between them, it is necessary, therefore, the adequacy of voltage levels generated by the panel with the voltage level of the electrical distribution network, in which it is connected.The power electronic converter used in this study consists of two stages with the first is a dcdc converter and the second is a dc-ac converter, frequency inverter.It will be controlled in two ways: the first is responsible for controlling the input voltage of the dc-dc converter and the power injection in the ac-dc converter which, besides being responsible for the transformation into alternating voltage is also responsible by the synchronism of the converter dc-ac with the utility grid.Simulation results of the converter operation connected to the utility grid are presented, its network control and operation of the complete electrical system.The complete design of converters and auxiliary circuits and the experimental results obtained in the laboratory are presented.