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Review of heliostat calibration and tracking control methods

Sattler, Johannes and Röger, Marc and Schwarzbözl, Peter and Buck, Reiner and Macke, Ansgar and Raeder, Christian and Göttsche, Joachim (2020) Review of heliostat calibration and tracking control methods. Solar Energy, 207, pp. 110-132. Elsevier. doi: 10.1016/j.solener.2020.06.030. ISSN 0038-092X.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0038092X20306447


Large scale central receiver systems typically deploy between thousands to more than a hundred thousand heliostats. During solar operation, each heliostat is aligned individually in such a way that the overall surface normal bisects the angle between the sun’s position and the aim point coordinate on the receiver. Due to various tracking error sources, achieving accurate alignment ≤1 mrad for all the heliostats with respect to the aim points on the receiver without a calibration system can be regarded as unrealistic. Therefore, a calibration system is necessary not only to improve the aiming accuracy for achieving desired flux distributions but also to reduce or eliminate spillage. An overview of current larger-scale central receiver systems (CRS), tracking error sources and the basic requirements of an ideal calibration system is presented. Leading up to the main topic, a description of general and specific terms on the topics heliostat calibration and tracking control clarifies the terminology used in this work. Various figures illustrate the signal flows along various typical components as well as the corresponding monitoring or measuring devices that indicate or measure along the signal (or effect) chain. The numerous calibration systems are described in detail and classified in groups. Two tables allow the juxtaposition of the calibration methods for a better comparison. In an assessment, the advantages and disadvantages of individual calibration methods are presented.

Item URL in elib:https://elib.dlr.de/136762/
Document Type:Article
Title:Review of heliostat calibration and tracking control methods
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sattler, Johannessattler (at) sij.fh-aachen.deUNSPECIFIED
Röger, MarcMarc.Roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Schwarzbözl, PeterPeter.Schwarzboezl (at) dlr.deUNSPECIFIED
Buck, ReinerReiner.Buck (at) dlr.deUNSPECIFIED
Macke, Ansgara.macke (at) cspservices.deUNSPECIFIED
Raeder, ChristianChristian.Raeder (at) dlr.deUNSPECIFIED
Göttsche, JoachimSolar-Institut JülichUNSPECIFIED
Date:1 September 2020
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 110-132
Keywords:Heliostat; Control; Calibration; Alignment; Central receiver system; Solar power tower
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Impact of Desert Environment (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualifizierung
Deposited By: Kruschinski, Anja
Deposited On:20 Oct 2020 08:03
Last Modified:20 Oct 2020 08:03

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