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Previous issue date: 2015-12-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O aumento da efici?ncia de sistemas foto-voltaicos tem sido alvo de diversos estudos nos ?ltimos anos. Uma das formas poss?veis de aumentar a pot?ncia extra?da por um painel foto-voltaico ? o rastreamento solar, realizando a sua movimenta??o de modo a seguir a trajet?ria do sol. Esta movimenta??o exige que o motor el?trico empregado possua torque suficiente e baixa velocidade, garantindo a precis?o do rastreamento. Com o uso de inversores tipo fonte de tens?o e de dispositivos que gerem a l?gica de chaveamento adequada ? poss?vel obter o torque e a velocidade necess?rios para o funcionamento do sistema. Este trabalho descreve a implementa??o de um sistema de controle de posi??o a ser aplicado no rastreador solar constru?do no Laborat?rio de Eletr?nica de Pot?ncia e Energias Renov?veis, situado na UFRN. A varia??o da velocidade do motor ? realizada atrav?s de um inversor tipo fonte de tens?o cujo comando PWM para acionamento das chaves ser? gerado por um dispositivo microcontrolador dedicado. O sensor utilizado para medi??o da inclina??o do painel ? um sensor de estado s?lido do tipo aceler?metro interfaceado ao microcontrolador. A posi??o solar ? tamb?m calculada pelo microcontrolador ? partir das coordenadas geogr?ficas do ponto de instala??o, e da data e hora locais obtidas a partir de um dispositivo RTC (Real-Time Clock). Um prot?tipo de rastreador solar polar de um eixo, movimentado por um motor CC, foi montado para atestar o funcionamento do sensor e verificar se o rastreamento ? realizado de forma eficiente. / The increase in the efficiency of photo-voltaic systems has been the object of various
studies the past few years. One possible way to increase the power extracted by a photovoltaic
panel is the solar tracking, performing its movement in order to follow the sun?s
path. One way to activate the tracking system is using an electric induction motor, which
should have sufficient torque and low speed, ensuring tracking accuracy. With the use
of voltage source inverters and logic devices that generate the appropriate switching is
possible to obtain the torque and speed required for the system to operate. This paper
proposes the implementation of a angular position sensor and a driver to be applied in
solar tracker built at a Power Electronics and Renewable Energies Laboratory, located
in UFRN. The speed variation of the motor is performed via a voltage source inverter
whose PWM command to actuate their keys will be implemented in an FPGA (Field
Programmable Gate Array) device and a TM4C microcontroller. A platform test with an
AC induction machine of 1.5 CV was assembled for the comparative testing. The angular
position sensor of the panel is implemented in a ATMega328 microcontroller coupled
to an accelerometer, commanded by an Arduino prototyping board. The solar position is
also calculated by the microcontroller from the geographic coordinates of the site where it
was placed, and the local time and date obtained from an RTC (Real-Time Clock) device.
A prototype of a solar tracker polar axis moved by a DC motor was assembled to certify
the operation of the sensor and to check the tracking efficiency.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21041 |
| Date | 09 December 2015 |
| Creators | Ara?jo, Jonas Damasceno Batista de |
| Contributors | 59464305800, http://lattes.cnpq.br/4823406157799513, Oliveira, Alexandre Cunha, 67686362434, http://lattes.cnpq.br/6699829609793478, Ribeiro, Ricardo Lucio de Ara?jo, 31804683434, http://lattes.cnpq.br/6628177274865696, Roda, Valentin Obac |
| Publisher | Universidade Federal do Rio Grande do Norte, 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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