Sistemas fotovoltaicos conectados á rede elétrica: um estudo de caso

Abstract

In this work, two Grid-Connected Photovoltaic Systems are sized based on the average consumption of electricity of two distinct buildings, respectively 4083 kWh and 1291 kWh, belonging to a company located in the city of Sobral - CE, in order to supply a portion of their energy demand. In order to choose a configuration that results in a higher productivity with a lower cost of investment with modules and inverters, an analysis of the series and parallel arrangements between these components, based on their electrical characteristics, is carried out. The analysis is divided into two case studies, called Case A and Case B. Case A deals with the Grid-Connected Photovoltaic System of the main building of the company, with higher consumption, while Case B deals with the Grid-Connected Photovoltaic System of the annexed building, with a lower consumption. An economic feasibility analysis for these two sized plants is carried out, based on the tariffs of electric energy from the local utility and on the expected electric energy production for the Grid-Connected Photovoltaic Systems over the useful life of the equipment. Three investment analysis methods, the NPV (Net Present Value), the Internal Rate of Return (IRR) and the Discounted Payback were used, and it is possible to estimate the investment return time for the two projected photovoltaic systems.