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Canting heliostats with computer vision and theoretical imaging

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  • Sánchez-González, Alberto
  • Lozano-Cancelas, Adrián
  • Morales-Sánchez, Rodrigo
  • Castillo, José Carlos

Abstract

Solar Power Tower technology requires accurate techniques to ensure the optical performance of the heliostats both in commissioning and operation phases. This paper presents a technique based on target reflection to detect and correct canting errors in heliostat facets. A camera mounted on the back of a target heliostat sees an object heliostat and the target facets in reflection. The pixels difference between detected and theoretical borders determines the canting errors. Experiments in a lab scale testbed show that canting errors can be corrected up to an average value of around as low as 0.15 mrad. Experiments were also performed on a real heliostat at Plataforma Solar de Almería. As a result, canting errors (up to 5 mrad) have been reduced below 0.75 mrad. Mirror slope errors, which can be noticeable in large facets, becomes the largest source of inaccuracy in the presented method.

Suggested Citation

  • Sánchez-González, Alberto & Lozano-Cancelas, Adrián & Morales-Sánchez, Rodrigo & Castillo, José Carlos, 2022. "Canting heliostats with computer vision and theoretical imaging," Renewable Energy, Elsevier, vol. 200(C), pages 957-969.
    • Handle: RePEc:eee:renene:v:200:y:2022:i:c:p:957-969
    DOI: 10.1016/j.renene.2022.10.014
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    References listed on IDEAS

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    1. Rodríguez-Sánchez, M.R. & Leray, C. & Toutant, A. & Ferriere, A. & Olalde, G., 2019. "Development of a new method to estimate the incident solar flux on central receivers from deteriorated heliostats," Renewable Energy, Elsevier, vol. 130(C), pages 182-190.
    2. Ren, Lanxu & Wei, Xiudong & Lu, Zhenwu & Yu, Weixing & Xu, Wenbin & Shen, Zhenfeng, 2014. "A review of available methods for the alignment of mirror facets of solar concentrator in solar thermal power system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 32(C), pages 76-83.
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