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Research Papers

Control Laws for a Linear Fresnel Reflector Solar Steam Generator in Once-Through Mode on a Commercial Operating Power Plant

[+] Author and Article Information
Laurent Bodini

Orano Projets,
5 rue du Gardon,
Pierrelatte 26700, France
e-mail: laurent.bodini@orano.group

Laurent Delale

Orano Projets,
1 Rue des Hérons,
Montigny-le-Bretonneux 78180, France
e-mail: laurent.delale@orano.group

Jean-Luc Nouet

Sogeti High Tech,
Parc du Golf - Bât 17,
350 avenue Jean René Guillibert Gautier de La
Lauzière, CS 40515,
Aix-en-Provence 13593 Cedex 3, France
e-mail: jeanluc.nouet@gmail.com

Bernard Dumercq

Orano Cycle,
Site de Marcoule,
Bagnols-sur-Cèze 30200, France
e-mail: bernard.dumercq@orano.group

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received March 8, 2018; final manuscript received October 18, 2018; published online November 26, 2018. Assoc. Editor: Aranzazu Fernandez Garcia.

J. Sol. Energy Eng 141(3), 031012 (Nov 26, 2018) (10 pages) Paper No: SOL-18-1102; doi: 10.1115/1.4041845 History: Received March 08, 2018; Revised October 18, 2018

This paper aims to present the process control laws developed for the concentrated solar power plant in Dhursar India by Areva Solar. The technology (linear Fresnel reflector (LFR), direct steam generation (DSG), once-through) used to produce superheated steam although being the most direct method is also the most challenging regarding the controls. The main control loops presented here are the flow control, the energy input control, and the steady-state optimization. With these control laws, the plant was able to produce 110 MWe in March 2016.

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References

Bijarniya, J. P. , Sudhakar, K. , and Prashant, B. , 2016, “ Concentrated Solar Power Technology in India: A Review,” Renewable Sustainable Energy Rev., 63, pp. 593–603. [CrossRef]
Aurousseau, A. , Vuillerme, V. , and Bezian, J. J. , 2016, Control Systems for Direct Steam Generation in Linear Concentrating Solar Power Plants—A Review, Renewable Sustainable Energy Rev., 56, pp. 611–630. [CrossRef]
Valenzuela, L. , Zarza, E. , Berenguel, M. , and Camacho, E. F. , 2006, “ Control Scheme for Direct Steam Generation in Parabolic Troughs Under Recirculation Operation Mode,” Sol. Energy, 80(1), pp. 1–17. [CrossRef]
Feldhoff, J. F. , Hirsch, T. , Pitz-Paal, R. , and Valenzuela, L. , 2015, “ Analysis and Potential of Once-Through Steam Generators in Line Focus Systems—Final Results of the DUKE Project,” SolarPACES 2015, Cape Town, South Africa, Oct. 13–15, p. 100006.
Mills, D. , and Morrison, G. , 2000, “ Compact Linear Fresnel Reflector Solar Thermal Power Plants,” Sol. Energy, 68(3), pp. 263–283. [CrossRef]
Tanner, P. , Rasmussen, K. , Johnson, P. , Hoermann, A. , and Cheng, W. , 2011, “ Control of Solar Steam Generators,” ASME Paper No. POWER2011-55175.
Camacho, E. , Berenguel, M. , Rubio, F. , and Martinez, D. , 2012, Control of Solar Energy Systems, Springer, Dordrecht, The Netherlands.
Valenzuela, L. , Zarza, E. , Berenguel, M. , and Camacho E. , 2005, “ Control Concepts for Direct Steam Generation in Parabolic Troughs,” Sol. Energy, 78(2), pp. 301–311. [CrossRef]
Birnbaum, J. , Feldhoff, J. , Fichtner, M. , Hirsch, T. , Jöcker, M. , Pitz-Paal, R. , and Zimmermann, G. , 2011, “ Steam Temperature Stability in a Direct Steam Generation Solar Power Plant,” Sol. Energy, 85(4), pp. 660–668. [CrossRef]

Figures

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Fig. 1

Solar steam generators hardware: LFR and receiver

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Fig. 2

View of an SSG from the raising tower side showing the preheater tubes and superheater tube in the raising tower, the receiver, some rows of the LFR; the tube balancing control valves are located at the bottom of the tower in the shadow area (hardly visible); other instruments on the ground area are located on the right (not shown)

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Fig. 3

Linear Fresnel reflector

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Fig. 4

Receiver and top of tower

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Fig. 5

Detailed view of the receiver on a section without cover glass with the superheater tube in the center

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Fig. 6

Tube arrangement and sensors

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Fig. 7

Example of measured temperature profile at the eight preheater tubes (left to right) and at the superheater tube (right to left, tube 5), x-scale in meters from the raising tower to the turnaround header, y-scale from 0 °C to 420 °C

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Fig. 8

Plant and steam collector (copyright by 2018 CNES/Airbus, DigitalGlobe, copyright by 2018 Google)

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Fig. 9

Feed water temperature for all running SSGs, May 15, 2015, y-scale from 0 °C to 250 °C, x-scale from 7 a.m. to 7 p.m.

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Fig. 10

Overall control strategy

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Fig. 11

Tracking factor value decreases (circled) in anticipation of temperature overshoots

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Fig. 12

Temperature control, SSG 27, Dec. 17, 2015, tracking factor effects are circled

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Fig. 13

HTF Mass flows and flow correction due to water inventory control, SSG 27, Dec. 17, 2015

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