This work aims to design an PI controller applied to the Buck converter to improve photovoltaic power generation in off-grid system facing more isolated area of the northern region. Experimental and simulation tests were performed to perform this study. In addition, the operating principles of photovoltaic modules, the dynamics of the characteristic curves and the modelling of a photovoltaic system aided by the software PSIM and MATLAB were studied and simulated. A Buck converter was then designed to meet the needs of the voltage and current levels to be supplied for the load. After the tests of the Buck converter with the photovoltaic system was designed an PI controller, aiming to correct the input voltage variation errors. And to finish the work were carried out simulation and experimental analyses obtaining the satisfactory behaviour as proposed by the controller design.Resumo: Este trabalho tem o objetivo de projetar um controlador PI aplicado ao conversor buck para melhoria da geração de energia fotovoltaica em sistema off-grid voltado para área mais isolada da região norte. Para a realização desse trabalho foram realizados testes experimentais e de simulação. Além disso, foram estudados e simulados os princípios de funcionamento de módulos fotovoltaicos, a dinâmica das curvas características e a modelagem de um sistema fotovoltaicos auxiliado pelos softwares PSIM e MATLAB. Em seguida foi dimensionado um conversor buck para atender as necessidades dos níveis de tensão e corrente a serem fornecidos para a carga. Após os testes do conversor buck com o sistema fotovoltaico foi projetado um controlador PI, objetivando corrigir os erros de variação de tensão de entrada. E para finalizar o trabalho foram realizadas análises de simulação e de experimentais obtendo o comportamento satisfatório conforme proposto pelo projeto do controlador.
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