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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Desempenho de um painel fotovoltaico de baixa tens?o, acoplado ao prot?tipo de um conversor dc/dc topologia Booster

Alc?ntara, Sara Maria Freitas de 18 June 2010 (has links)
Made available in DSpace on 2014-12-17T14:58:04Z (GMT). No. of bitstreams: 1 SaraMFA.pdf: 4966448 bytes, checksum: 1ef74fa9275b2d2eb81d82fd6bcd301f (MD5) Previous issue date: 2010-06-18 / Low voltage solar panels increase the reliability of solar panels due to reduction of in series associations the configurations of photovoltaic cells. The low voltage generation requires DCDC converters 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, configured to generate an open circuit voltage of 10.5 V, with load voltage of 8.5 V, with short circuit current of 9 A and a power of 77 W. The solar panel was assembled in the isolated photovoltaic system configuration, with and without energy storage as an interface with a DCDC converter, Booster topology. The converter was designed and fabricated using SMD (Surface Mounted Devices) technology IC (integrated circuit) that regulates its output voltage at 14.2 V, with an efficiency of 87% and providing the load a maximum power of 20.88 W. The system 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 output voltages, panel, inverter, and battery charge output currents. The photovoltaic system was initially 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 at 5.5?, consistent with the latitude of Natal city. Factors such as climatic conditions (simultaneous variations of temperature, solar luminosities and ra diation on the panel), values of load resistance, lower limit of the maximum power required by the load (20.88 W) were predominant factors 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% / Pain?is solares de baixa tens?o aumentam a confiabilidade dos pain?is solares, devido ? redu??o das associa??es em s?rie nas configura??es das c?lulas fotovoltaicas. A gera??o em baixa tens?o requer dispositivos conversores DC/DC de alto rendimento, que possibilitem elevar e regular a tens?o de sa?da. O presente estudo analisa o desempenho de um painel fotovoltaico da Solarex, modelo MSX 77, configurado para gerar uma tens?o em aberto de 10,5 V, tens?o com carga de 8,5 V, com uma corrente de curto-circuito de 9,0 A, e uma pot?ncia de 77 Watts. O painel solar foi montado na configura??o de sistema fotovoltaico isolado, com e sem armazenamento de energia tendo como elemento de interface um conversor DC-DC, topologia Booster. O conversor foi projetado e confeccionado com circuitos integrados de tecnologia Surface Mounted Devices (SMD), para regular tens?o de sa?da em 14,2V, com rendimento de 87 % , disponibilizando a carga uma pot?ncia m?xima de 20,88W. O sistema foi instalado e instrumentado para medi??o e aquisi??o dos seguintes dados: luminosidades, radia??es m?dias globais (dados do Instituto Nacional de Pesquisas Espaciais (INPE)), temperaturas do painel solar, temperatura ambiente, tens?es de sa?da do painel solar, tens?o de sa?da do conversor DC-DC, correntes de sa?da do painel, do conversor, da carga e da bateria. O conjunto fotovoltaico foi inicialmente ensaiado em laborat?rio (simulando seu funcionamento em condi??es ideais de opera??o) e, em seguida, submetido a testes em condi??es reais de campo. O ?ngulo da inclina??o do painel foi fixado em 5,5?, compat?vel com a latitude da cidade de Natal. Fatores como condi??es clim?ticas (varia??es simult?neas de altas temperaturas e radia??es solares), valores da resist?ncia de carga, baixo limite da m?xima pot?ncia solicitada pela carga (20,88W) foram fatores predominantes para que painel n?o operasse com n?veis de efici?ncia energ?tica maiores que 5 ? 6 %. O rendimento m?dio do conversor projetado nos ensaios de campo alcan?ou 95 %

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