Economic Optimization of a Thermal Solar Power Plant That Operates With a HRB Cycle by Improving the Operation Schedule




Medium Temperature Solar Thermal Energy, STPP, B-HRB, CSP


In this paper, two solutions are proposed to increase the sales revenue of a pre-sized solar thermal power plant (STPP) that operates with a Hybrid Rankine Brayton cycle (HRB) by changing the reference operating parameters. In the first solution, the turbine inlet temperature value is optimized to increase the energy production. In the second solution, a  new dispatch strategy that prioritizes energy production during the hours of higher sales price is additionally implemented in low solar radiation months. In the remaining months, the reference dispatch strategy that prioritizes production from energy coming directly from the solar field over energy from storage system is maintained. The incremental sales revenue of each solution proposed over the reference case is calculated considering hourly SPOT prices for a three-year period and considering hourly annual simulations for a typical year.


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Red Eléctrica de España, “redOS.” Red Eléctrica de España, Mar. 29, 2023. Accessed: Jun. 06, 2023. [Online]. Available:

Souza, P. Del Río, and C. P. Kiefer, “MUSTEC Working Document Issue 2 | Representative CSP Case Studies and Assessment of the Pros and Cons Lessons learned from the past,” 2020. Accessed: Jun. 06, 2023. [Online]. Available:

J. Usaola, “Operation of concentrating solar power plants with storage in spot electricity markets,” IET Renewable Power Generation, vol. 6, no. 1, pp. 59–66, Jan. 2012, doi:

G. San Miguel and B. Corona, “Economic viability of concentrated solar power under different regulatory frameworks in Spain,” Renewable and Sustainable Energy Reviews, vol. 91, pp. 205–218, Aug. 2018, doi:

Solutia, “Therminol VP-1. 12oC to 400oC,” 1999.

R. Ferri, A. Cammi, and D. Mazzei, “Molten salt mixture properties in RELAP5 code for thermodynamic solar applications,” International Journal of Thermal Sciences, vol. 47, no. 12, pp. 1676–1687, Dec. 2008, doi:”

Rovira, M. Muñoz, C. Sánchez, and J. M. Martínez-Val, “Proposal and study of a balanced hybrid Rankine-Brayton cycle for low-to-moderate temperature solar power plants,” Energy, vol. 89, pp. 305–317, Sep. 2015, doi:

Rovira, R. Abbas, C. Sánchez, and M. Muñoz, “Proposal and analysis of an integrated solar combined cycle with partial recuperation,” Energy, vol. 198, May 2020, doi:

Rovira, M. J. Montes, M. Valdes, and J. M. Martínez-Val, “Energy management in solar thermal power plants with double thermal storage system and subdivided solar field,” Appl Energy, vol. 88, no. 11, pp. 4055–4066, 2011, doi:

S. Relloso and E. Delgado, Experience with molten salt thermal storage in a commercial parabolic trough plant. Andasol-1 comissioning and operation. In: Proc of 15th int SolarPACES symposium on solar thermal concentrating technology, Berlin,Germany, 2009.

M. Montes, “Análisis y propuestas de sistemas solares de alta exergía que emplean agua como fluido calorífero,” Univ. Politécnica de Madrid, Madrid, 2008.

M. J. Wagner and P. Gilman, “Technical Manual for the SAM Physical Trough Model,” 2011. [Online]. Available:




How to Cite

Subires, A. J., & Rovira, A. (2023). Economic Optimization of a Thermal Solar Power Plant That Operates With a HRB Cycle by Improving the Operation Schedule. SolarPACES Conference Proceedings, 1.

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