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

Acosta, David; García, Julie A.; Sanjuán, Marco; Oberkirsch, Laurin; Schwarzbözl, Peter

doi:10.1016/j.solener.2020.12.028

Cited by 11 publications

(6 citation statements)

References 31 publications

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“…The method helps reduce uncertainties in designing an efficient aiming system, preventing the heat flux distribution from reaching dangerously high levels on the receiver surface. Acosta et al 82 presented a novel flux-feedback closed-loop control algorithm to manipulate sets of aiming points for each heliostat to dynamically change the incident flux on the receiver. They tested their algorithm in a simulated power plant consisting of 6482 heliostats and 450 MW of nominal thermal power.…”

Section: Heliostat Field Systemmentioning

confidence: 99%

Stationary point focus solar concentrators—A review

Reddy

Khan

2022

Intl J of Energy Research

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The innovation in concentrated solar power (CSP) systems is one of the many vital solutions to meet the ever-increasing global energy demands. Among various CSP systems, point focus solar concentrators can attain a higher concentration ratio and helps reduce the size of the receiver, resulting in higher operating temperatures, lower thermal losses, and higher system exergy. This article presents a review on a particular class of CSP systems known as stationary point focus solar concentrators, that is, point focus solar concentrators having a stationary receiver. They can be categorized as (a) Scheffler reflector, (b) Scheffler-type concentrator, (c) high temperature concentrator, (d) central tower receiver, and (e) CNRS solar furnace. Having a stationary receiver helps reduce the maintenance and simplifies the plumbing network for heat transfer fluid. However, low maintenance might be a tradeoff on the performance side. This review systematically collates the literature on stationary point focus solar concentrators. Also, the basics of solar angles and various solar tracking systems applicable to this class of CSP systems are covered. K E Y W O R D Scentral tower receiver, fixed focus solar concentrator, high-temperature concentrator, Scheffler reflector, Scheffler-type solar concentrator

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Section: Heliostat Field Systemmentioning

confidence: 99%

Stationary point focus solar concentrators—A review

Reddy

Khan

2022

Intl J of Energy Research

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“…The mass flow controller of the receiver, on the other hand, tries to achieve the desired outlet temperature while considering changes in the incident solar power as disturbances. While closed-loop mass flow controllers are state of the art, closed-loop control of the heliostat field is still under development [1]. This is due to the large number of aim points to be controlled and the difficulty of measuring the solar flux density at the receiver surface [2].…”

Section: Introductionmentioning

confidence: 99%

A Real-Time Capable Simulation of Open Volumetric Receiver Surface Temperatures With Spatially High Resolution

Iding,

Zanger,

Maldonado Quinto

et al. 2024

SolarPACES Conf Proc

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The performance of open volumetric receivers can profit from advanced control of the heliostat aim points and the air mass flow. Advanced control techniques like model predictive control and state observer are based on dynamic system models. A suitable model for this purpose is introduced and validated with data recorded at the solar tower Jülich. The model shows good performance with respect to the dynamics of individual absorber cups. The simulation of the whole receiver requires an advanced optimization of the model parameters.

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“…Optimum receiver and solar field system design (Li et al, 2020;Madadi Avargani et al, 2021) 2. Alternate methods of aiming (Garcí a et al, 2020;Acosta et al, 2021) 3. Modifying the heat transfer properties of the system by changing the operating conditions (Zhang et al, 2013;Rodríguez-Sánchez et al, 2018) Single point aiming strategy, which was first suggested by reference (Vant-Hull, 2002), is investigated by various researchers (Sanchez-Gonzalez et al, 2017;Garcí a et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Reference (Belhomme et al, 2014) described an ant colony metaheuristic-based approach for optimizing the targeting multi points aim points, whose effectiveness was proved on a concentrated photovoltaic receiver test case. The flux-feedback closed-loop control law proposed by reference (Acosta et al, 2021) manipulates the swarm behavior of groups of multi aiming points for heliostats in the solar field. With a configuration of aiming points, the suggested controller can achieve a steady-state that is near to the best solution found using a hybrid optimization approach.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Optimum Solar Flux Distribution on a Large-Scale Particle Heating Receiver

et al. 2022

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Solid particles have been shown to be an effective heat transmission as well as thermal storage medium for falling particle receiver based solar power systems at temperatures up to 1,000°C. The temperature distribution on the surface of the falling particle receiver is critical. High temperatures, thermal shocks, and temperature gradients produce substantial stresses on the receiver due to high, fluctuating, and non-homogeneous solar flux. To this effect, the optimum control of the heliostats’ aiming points is one of the obstacles that must be overcome. The flux distribution on the receiver surface must be carefully managed to avoid dangerous flux peaks or excessive temperature gradients which might result in local hot spots resulting in damage of the receiver’s internal components over time. To overcome this problem, specifying multiple aiming points on the receiver aperture may control the solar flux distribution. In this study both single and multi aiming points strategies are applied by assigning a group of heliostats to a specific aim point on the receiver, resulting in a uniform flux distribution over the receiver surface. Engineering software packages SolarPILOT, SOLTRACE and MATLAB are used in combination to get the optimal flux distribution. The results showed that the flux distribution is improved significantly after employing the multi aiming points strategy at the expense of greater spillage.

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

Cited by 11 publications

References 31 publications

Stationary point focus solar concentrators—A review

Stationary point focus solar concentrators—A review

A Real-Time Capable Simulation of Open Volumetric Receiver Surface Temperatures With Spatially High Resolution

An Investigation of the Optimum Solar Flux Distribution on a Large-Scale Particle Heating Receiver

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