Dimensionamento de um sistema fotovoltaico monofásico conectado à rede elétrica operando com fator de potência unitário

Abstract

The growing attention given to the environmental impacts caused by traditional sources of energy and the possibility of generating local electric energy, boosted the implementation of photovoltaic systems connected to the grid. These systems are classified as distributed generation, which are increasingly gaining space in the global energy matrix. In Brazil, climatic characteristics and geographical position provide favorable conditions for solar irradiation, which brings advantages in the generation of photovoltaic solar energy. In this context, the IFBA campus Paulo Afonso has some photovoltaic generators, and in view of the relevance of the theme, the present work proposes the dimensioning of a single-phase photovoltaic system connected to the grid. The proposed system is determined based on the electrical configurations of the photovoltaic panels available on the campus, which enables a system with two conversion stages. In the DC-DC conversion stage, the components for a boost converter are dimensioned, in addition to a maximum power tracking algorithm. In the DC-AC conversion stage, a voltage source converter, a modulation strategy, a connection filter and a synchronism strategy with the grid are implemented. In addition, the work proposal aims to ensure that the photovoltaic system operates with a single power factor, injecting active power into the grid. To guarantee such conditions, current and voltage controls are implemented in the synchronous framework, acting together as a cascade system. All components and control strategies are implemented and evaluated through simulations, using the PSIM software.