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Flux-Feedback as a fast alternative to control groups of aiming points in molten salt power towers

Acosta Villamil, David Roberto and Garcia, Jesus and Sanjuan, Marco and Oberkirsch, Laurin and Schwarzbözl, Peter (2021) Flux-Feedback as a fast alternative to control groups of aiming points in molten salt power towers. Solar Energy. Elsevier. doi: 10.1016/j.solener.2020.12.028. ISSN 0038-092X.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0038092X20312792


The receiver is one of the critical elements in central tower concentrating solar power plants, which use molten salt as heat transfer fluid. Gradients in the incident flux, a consequence of the natural variability of the solar resource on the earth’s surface, and temperature limits must be considered in the operation of the system, due to corrosive phenomena caused by the interaction between the metal alloys used on the receiveŕs tubes and the molten salt. Furthermore, considering thermal stresses in the receiver as operational constraints leads to the prevention of fractures and has the potential to improve the lifespan of the subsystem. In this work, a novel control strategy is tested in a simulated power plant with a nominal thermal power of 450 MW and a solar field with 6482 heliostats. A flux-feedback closed-loop control law is proposed, which manipulates the swarm behavior of groups of aiming points for heliostats in the solar field and also reduces each iteration the information from the incident flux on the receiver’s surface into one variable per group. This work established that the proposed controller can reach a steady-state with a configuration of aiming points, which is close to the optimal solution obtained by a hybrid optimization approach, but much faster and with less computational resources. For the simulation and the optimization, a static coupled optical-thermal model is used.

Item URL in elib:https://elib.dlr.de/140085/
Document Type:Article
Title:Flux-Feedback as a fast alternative to control groups of aiming points in molten salt power towers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Oberkirsch, LaurinUNSPECIFIEDhttps://orcid.org/0000-0001-7018-3664UNSPECIFIED
Date:February 2021
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Solar field controlAllowable flux density (AFD)FeedbackClosed-loop
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 - Advanced Heat Transfer Media (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Power Plant Technology
Deposited By: Schwarzbözl, Peter
Deposited On:08 Jan 2021 09:14
Last Modified:08 Jan 2021 09:14

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