Previsão da economia de energia elétrica obtida a partir do sistema fotovoltaico de 301 kWp instalado em uma universidade no Oeste do Paraná

Abstract

The Brazilian energy matrix is predominantly based on renewable sources, representing 49.92% of the generation in 2023. The contribution of photovoltaic energy is expected to increase from 5.9% in 2024 to 8.5% by 2028. In order to reduce electricity costs at a university in western Paraná, a photovoltaic system with an installed capacity of 301 kW was installed. This study presents the simulation of the system installed at the university, aiming to estimate the annual generation, the savings achieved, and to evaluate the financial indicators for the investment, such as payback, IRR, and NPV. The PVSyst software was used for the simulation, considering the climatic conditions and solar incidence for the city of Medianeira, Paraná, as well as the system's characteristics (azimuth and tilt angle). It was possible to add components with the same brands and models as those in the installed system, and also to create a 3D model of nearby structures that generate shading. The NPV, IRR, and payback values indicate a financially viable investment. The simulation showed a generation of more than 500,000 kWh over the year, a payback period of 5.5 years, and an internal rate of return of 25.13%. The simulation also indicated that there would be a 4.14% lower generation if monofacial panels had been installed instead of bifacial ones. However, the financial indicators show that the use of bifacial panels is more favorable. The energy output from the inverter for a 25° tilt would be 5.53% higher than for a 10° tilt, which was used due to the mechanical stresses and requests from the maximum wind speed for the region.