Conversor CC-CC aplicado à geração fotovoltaica

Abstract

Photovoltaic power generation is a clean energy matrix and that develops every day in the world. However, like any energy matrix in the world, generating energy from sunlight also presents problems. As the incidence of sunlight on the photovoltaic slab varies during the day, its needed a way to keep the power supply less variable. This paper focuses on present a DC-DC converter model that act as charge controller of a bank of batteries. The function of this converter is to store the surplus power on the batteries in high generation times and use this energy in low production times to maintain the DC bus voltage within the prescribed limits. This paper will show some models of isolated DC-DC converters, battery equivalent electric models and charging methods, development of a bidirectional isolated DC-DC converter and simulations of this converter through the PSIM software. To control this system will be used PI type controllers digitally implemented. The simulated system shows satisfactory results, despite some details that influenced the final graphics. However, only analyzing the operation of the converter, this provides a fully satisfactory result.