Loading...
Publication
Corrección de la deriva en sistemas de seguimiento solar a través de control de lazo cerrado
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 1.52 MB | Adobe PDF |
Advisor(s)
Abstract(s)
RESUMEN: Los sistemas de seguimiento solar de dos ejes en aplicaciones de concentración solar requieren una mayor precisión en el seguimiento automático de la posición aparente del Sol, esto con el fin de mantener la radiación solar concentrada en una posición fija en el receptor del sistema, ya que una mínima variación se traduce en un desplazamiento (deriva) del spot de concentración de la zona de interés. Este trabajo se centra en la discusión de los métodos implementados para la solución de los problemas de deriva y corrección de los ángulos de elevación y acimut en los dispositivos de seguimiento solar. Para llevar a cabo la evaluación de la corrección de la deriva, se emplearon dos dispositivos de seguimiento solar de dos ejes de movimiento. Un Helióstato de 36 m2 (E3) ubicado en la Plataforma Solar de Hermosillo, Sonora, México. El segundo es un concentrador solar reflectivo de no imagen tipo Fresnel para la caracterización de celdas fotovoltaicas ubicado en el IER-UNAM en Temixco, Morelos, México. El análisis planteado en este documento se basa principalmente en la comparativa de los resultados obtenidos a partir de implementar una estrategia de control de lazo abierto y cerrado. El control de lazo abierto consiste en un código de programación que realiza el cálculo de la posición del Sol mediante algoritmos propuestos por distintos autores, y que permiten enviar señales de comando a los actuadores de los ejes de acimut y elevación en ambos dispositivos de seguimiento. Para la metodología de lazo cerrado se utiliza un sistema óptico de retroalimentación que trata de un dispositivo de visión (CCD) que permite observar la posición del Sol en tiempo real.
ABSTRACT: Two axis solar tracking systems require high precision regarding automatic tracking of apparent sun position for solar concentration applications. This, with the aim of maintaining the concentrated solar radiation in a fixed position in the system´s receiver. This is so, because a minimum variation results in a deviation (drift) of the solar image concentrated in the area of interest. This work focuses on a discussion of implemented methods for solving drift problems and a correction of elevation and azimuth angles in solar tracking devices. Two sun tracking devices of two axes movement were used in order to evaluate drift correction. The first one was a 36 m2 heliostat (named E3), located in the Solar Platform in Hermosillo, Sonora, México. The second tracking device was a solar concentrator Fresnel type for characterizing photovoltaic cells (FRESNEL) located at IER-UNAM, Temixco, Morelos, México. The analysis of this document is mainly based on the comparison of obtained results from implementing an open-loop and close-loop control strategy. Open-loop control consists of a program code that calculates the Sun's position using algorithms suggested by different authors, it allows send command signals to elevation and azimuth axis actuators on both tracking devices. Closed-loop methodology uses an optical feedback system, which refers to a vision device (webcam) that allows observing in real time the Sun´s position.
ABSTRACT: Two axis solar tracking systems require high precision regarding automatic tracking of apparent sun position for solar concentration applications. This, with the aim of maintaining the concentrated solar radiation in a fixed position in the system´s receiver. This is so, because a minimum variation results in a deviation (drift) of the solar image concentrated in the area of interest. This work focuses on a discussion of implemented methods for solving drift problems and a correction of elevation and azimuth angles in solar tracking devices. Two sun tracking devices of two axes movement were used in order to evaluate drift correction. The first one was a 36 m2 heliostat (named E3), located in the Solar Platform in Hermosillo, Sonora, México. The second tracking device was a solar concentrator Fresnel type for characterizing photovoltaic cells (FRESNEL) located at IER-UNAM, Temixco, Morelos, México. The analysis of this document is mainly based on the comparison of obtained results from implementing an open-loop and close-loop control strategy. Open-loop control consists of a program code that calculates the Sun's position using algorithms suggested by different authors, it allows send command signals to elevation and azimuth axis actuators on both tracking devices. Closed-loop methodology uses an optical feedback system, which refers to a vision device (webcam) that allows observing in real time the Sun´s position.
Description
CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar
Keywords
Solar energy Solar system simulation Image processing
Citation
González-Camarillo, H... [et.al.] - Corrección de la deriva en sistemas de seguimiento solar a través de control de lazo cerrado. In: CIES2020: As Energias Renováveis na Transição Energética: Livro de Comunicações do XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar. Helder Gonçalves, Manuel Romero (Ed.). Lisboa, Portugal: LNEG, 3-5 Novembro, 2020, p. 601-609
Publisher
LNEG - Laboratório Nacional de Energia e Geologia