Desempenho de um painel fotovoltaico de baixa tensão, acoplado ao protótipo de um conversor dc/dc topologia Booster

摘要

Low voltage solar panels increase the reliability of solar panels due to reduction of in seriesassociations the configurations of photovoltaic cells. The low voltage generation requires DCDCconverters devices with high efficiency, enabling raise and regulate the output voltage.This study analyzes the performance of a photovoltaic panel of Solarex, MSX model 77, configuredto generate an open circuit voltage of 10.5 V, with load voltage of 8.5 V, with shortcircuit current of 9 A and a power of 77 W. The solar panel was assembled in the isolatedphotovoltaic system configuration, with and without energy storage as an interface with a DCDCconverter, Booster topology. The converter was designed and fabricated using SMD (SurfaceMounted Devices) technology IC (integrated circuit) that regulates its output voltage at14.2 V, with an efficiency of 87% and providing the load a maximum power of 20.88 W. Thesystem was installed and instrumented for measurement and acquisition of the following data:luminosities, average global radiation (data of INPE Instituto Nacional de Pesquisas Espaciais),solar panel and environment temperatures, solar panel and DC-DC converter outputvoltages, panel, inverter, and battery charge output currents. The photovoltaic system wasinitially tested in the laboratory (simulating its functioning in ideal conditions of operation)and then subjected to testing in real field conditions. The panel inclination angle was set at5.5°, consistent with the latitude of Natal city. Factors such as climatic conditions (simultaneousvariations of temperature, solar luminosities and ra diation on the panel), values of loadresistance, lower limit of the maximum power required by the load (20.88 W) were predominantfactors that panel does not operate with energy efficiency levels greater than 5 to 6%.The average converter efficiency designed in the field test reached 95%