COMPARISON OF RESULTS GENERATION OF ELECTRICITY THROUGH RADIATION DATA BASES DIFFERENT

CASE STUDY IN CURITIBA

Abstract

Due to the increasing energy demand, the alternative energy generation sources are becoming more popular. Because of its location, mostly an intertropical country, the photovoltaic generation in Brazil has a remarkable potential. The approaches to estimate these systems’ energy are many. This paper aims to compare the estimated generated energy and data from a real system, based in Curitiba, using three different methods: SWERA, INMET database and Paraná’s photovoltaic maps. The results obtained using the INMET database were the closest to the existing photovoltaic system (deviation of 0.5%), while the results obtained using the maps (Atlas Brasileiro de Energia Solar) had the greatest deviations (14.3%, 15.9% and 22.3%). The differences are explained as a reflex of the data acquisition: the maps data is an average, considering the last 10 typical and atypical years, of energy measures while INMET data is obtained in a solarimetric station in the studied real system’s location, during a shorter period. Hence, the INMET database, that shows closest results to the real system’s behavior, can be used to calibrate the installed photovoltaic system after its installation. However, for design and project purposes, it is still recommendable to use the Atlas Brasileiro de Energia Solar database, since its data has been collected for a wider period than the INMET database (4 years of data). It represents better the climate variations, which induces less deviation in the long term.