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Closed loop control of heliostats

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  • Kribus, Abraham
  • Vishnevetsky, Irina
  • Yogev, Amnon
  • Rubinov, Tatiana

Abstract

Tracking control in current heliostats is performed with an open loop, without any verification that the radiation is actually arriving at the desired target. Errors due to open-loop tracking control are often around 1–2 mrad and can accumulate during operation. A significant reduction of tracking error by closing the control loop is presented. The method includes a dynamic measurement of the actual radiation incident around the receiver’s aperture (spillage), detection of aiming errors, and feedback of a correction signal to the tracking algorithm. The measurement does not interfere with the receiver operation. The detection method can distinguish among different heliostats in the field, producing individual corrections to each heliostat. The closed loop control system was developed and successfully operated at the Weizmann Institute heliostat field. Both large errors and gradual drift errors were detected and corrected automatically. Resolution of the closed loop detection algorithm can reach 0.1 mrad, which is insignificant in the overall heliostat beam quality.

Suggested Citation

  • Kribus, Abraham & Vishnevetsky, Irina & Yogev, Amnon & Rubinov, Tatiana, 2004. "Closed loop control of heliostats," Energy, Elsevier, vol. 29(5), pages 905-913.
    • Handle: RePEc:eee:energy:v:29:y:2004:i:5:p:905-913
    DOI: 10.1016/S0360-5442(03)00195-6
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    Cited by:

    1. Ashley, Thomas & Carrizosa, Emilio & Fernández-Cara, Enrique, 2017. "Optimisation of aiming strategies in Solar Power Tower plants," Energy, Elsevier, vol. 137(C), pages 285-291.
    2. Emmanuel Wendsongre Ramde & Eric Tutu Tchao & Yesuenyeagbe Atsu Kwabla Fiagbe & Jerry John Kponyo & Asakipaam Simon Atuah, 2020. "Pilot Low-Cost Concentrating Solar Power Systems Deployment in Sub-Saharan Africa: A Case Study of Implementation Challenges," Sustainability, MDPI, vol. 12(15), pages 1-14, August.
    3. Chiesi, Matteo & Franchi Scarselli, Eleonora & Guerrieri, Roberto, 2017. "Run-time detection and correction of heliostat tracking errors," Renewable Energy, Elsevier, vol. 105(C), pages 702-711.
    4. Carrizosa, E. & Domínguez-Bravo, C. & Fernández-Cara, E. & Quero, M., 2015. "Optimization of multiple receivers solar power tower systems," Energy, Elsevier, vol. 90(P2), pages 2085-2093.
    5. Behar, Omar & Khellaf, Abdallah & Mohammedi, Kamal, 2013. "A review of studies on central receiver solar thermal power plants," Renewable and Sustainable Energy Reviews, Elsevier, vol. 23(C), pages 12-39.
    6. Renzi, M. & Egidi, L. & Comodi, G., 2015. "Performance analysis of two 3.5kWp CPV systems under real operating conditions," Applied Energy, Elsevier, vol. 160(C), pages 687-696.

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