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Previous issue date: 2017-06-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Os sistemas fotovoltaicos t?m se destacado entre os diferentes tipos de fontes de energia renov?veis
por converterem diretamente a luz solar em eletricidade, apresentarem baixa manuten??o,
bom rendimento na produ??o de eletricidade e n?o produzir gases do efeito estufa. Devido a
algumas mudan?as clim?ticas de temperatura, radia??o e sombreamento no painel, a produ??o
de eletricidade ? comprometida e isso provoca uma queda na efici?ncia de gera??o dos pain?is
fotovoltaicos. Portanto, eles precisam de um sistema de rastreamento que fa?a o painel operar
no ponto de m?xima pot?ncia. Esses sistemas de rastreamento s?o os chamados rastreadores de
m?xima pot?ncia, ou do ingl?s Maximum Power Point Tracker - MPPT. O objetivo principal
desse trabalho ? montar um sistema fotovoltaico controlado por um DSP TMS320F28335 e um
conversor chaveado do tipo Boost, de modo que o sistema fa?a o rastreamento da m?xima pot?ncia
do painel, maximizando sua efici?ncia. Neste trabalho ? implementada uma estrat?gia de
controle baseada na medi??o da temperatura do painel para fornecer a tens?o de refer?ncia equivalente
ao ponto de m?xima pot?ncia sob condi??es fora dos padr?es internacionais de testes e
simulando efeitos de sombreamento das c?lulas fotovoltaicas, varia??es de temperatura e carga.
De acordo com a temperatura lida pelo sensor LM35, o DSP TMS320F28335 ir? ajustar a tens?o
de refer?ncia do controlador Proporcional Integral resultando em um valor de ciclo de trabalho
do conversor Boost. O chaveamento do conversor Boost ser? feito utilizando a t?cnica de controle
de um ciclo, One Cycle Control - OCC, ao inv?s da Modula??o por Largura de Pulso, a
PWM. A t?cnica de chaveamento OCC fornece algumas vantagens frente ao PWM como uma
r?pida resposta ? mudan?a de refer?ncia, erro nulo em regime e rejei??o de perturba??es na entrada.
Foram feitos testes simulados variando condi??es clim?ticas de radia??o e temperatura e
analisado o funcionamento do OCC em rela??o ao PWM. Os resultados experimentais mostram
que o esquema baseado na medi??o de temperatura apresenta algumas vantagens em rela??o ao
m?todo da Tens?o Constante utilizando a modula??o PWM. / Photovoltaic systems have stood out among the different types of renewable energy sources by
directly converting sunlight into electricity, low maintenance, good performance in electricity
production and do not produce greenhouse gases. Due to some climatic changes of temperature,
radiation and shading on the panel, the production of electricity is compromised and this causes
a decrease in the generation efficiency of the photovoltaic panels. Therefore, they need a tracking
system that makes the panel operate at the maximum power point. These tracking systems
are the so-called Maximum Power Point Tracker ? MPPT. The main objective of this work is
to build a photovoltaic system controlled by a DSP TMS320F28335 and switched converter
boost type, so that the system traces the maximum panel power, maximizing your efficiency.
In this work a control strategy is implemented based on the panel temperature measurement to
provide the reference voltage equivalent to the maximum power point under outside conditions
of international testing standards and simulating shading effects of photovoltaic cells and temperature
and load variations. According to the temperature read by the sensor LM35, the DSP
TMS320F28335 will adjust the reference voltage of the PI controller resulting in a duty-cycle
value of the Boost converter. The switch of the boost converter will be done using the control
technique One Cycle Control ? OCC rather than the widely used PulseWidth Modulation ?
PWM. The OCC switching technique provides some advantages over PWM as a quick response
to the reference change, null error in steady state and rejection of input disturbances. Simulated
tests were performed by varying the climatic conditions of radiation and temperature and analyzed
the operation of the OCC in relation to the PWM. The experimental results show that
the scheme based on temperature measurement has some advantages over the Constant Voltage
method using PWM modulation.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23687 |
| Date | 26 June 2017 |
| Creators | Leite, Alan C?ssio Queiroz Bezerra |
| Contributors | 51618362968, http://lattes.cnpq.br/7865065553087432, Guimar?es, Alexandre Magnus Fernandes, 65578945449, http://lattes.cnpq.br/4171253034582522, Carvalho Neto, Jo?o Teixeira de, 06753360409, http://lattes.cnpq.br/6517981413434811, Salazar, Andres Ortiz |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA EL?TRICA E DE COMPUTA??O, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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