Desempenho de um controle repetitivo em um sistema fotovoltaico conectado à rede sob condições de distorção

Abstract

This work presents a methodology for the use of a repetitive-based control in a photovoltaic system connected to the grid in order to make it suitable to the presence of harmonic distortions of voltage coming from the electric grid. The system used is composed of photovoltaic module, current-fed push-pull DC-DC converter, single-phase full bridge inverter, LCL filter and control system. To this system, that works in real time, is not used phase locked loop for electric grid voltage, then there is a smaller processing time and system complexity. As one of the consequences, the processing time is quite reduced, it is an advantage in the execution of the system in real time. Simulation results in Matlab® are presented, as well as experimental results obtained in the Laboratory of Optimization of Electrical Systems of the Federal University of Paraíba - UFPB. A comparison between the performance of the repetitive-based control and the resonant control with respect to the presence of network voltage harmonics is presented.