Estudo e análise do microinversor Ćuk para sistemas fotovoltaicos conectados à rede elétrica monofásica

Abstract

This paper presents the study and analysis of the use of the converter Ćuk in photovoltaic systems connected to the single-phase electric grid. In this sense, the converter Ćuk is controlled in order to both follow the maximum power point of the photovoltaic arrangement and produce a rectified sinusoidal current in the output inductor. In sequence, a complete single-phase bridge inverter connected to the electrical grid is employed that reverses the output current from Ćuk to the electrical grid, operating with switching at the same frequency as the grid. In this way, the inverter Ćuk is designed to operate in Discontinuous Conduction Mode (MCD). In this work, the quantitative and qualitative analysis of the converter is performed, presenting the design equations in permanent regime, as well as the equations describing the transient behavior of the converter. The modeling of small signals is carried out considering the lossless resistor model, which permits obtaining the transfer function of the system, as well as the current controller design. Finally, from this study it will be implemented in a computational simulation environment in order to validate the theoretical development performed