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Automatic control strategies for hybrid solar-fossil fuel power plants

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  • Fontalvo, Armando
  • Garcia, Jesus
  • Sanjuan, Marco
  • Padilla, Ricardo Vasquez

Abstract

Solar electrical generating systems are a class of solar energy systems which use parabolic trough collectors (PTC) to produce electricity from sunlight. In order to provide power production, one of the major challenges is to held the collector outlet temperature or steam temperature around of a specified set point by adjusting the flow rate of the heat transfer fluid (HTF) within upper and lower bounds. In some cases, an auxiliary heater can be used to provide heat in absence of solar radiation or during cloudy days. This paper presents a comprehensive study of three control schemes proposed to keep the steam temperature around its set point by adjusting the fuel (propane) and air mass flow rate of the auxiliary fossil fuel-fired heater. A non-linear dynamic model was developed in SIMULINK® to study the performance of each control scheme. Variation of controlled and manipulated variables along with the valve signals is presented for a period of a cloudy day. The results showed that the combination of feedforward and three level cascade control is the best alternative to track the temperature set point. It was also found that a single three level cascade control without feedforward had less oscillations and low fuel consumption compared to the others control strategies.

Suggested Citation

  • Fontalvo, Armando & Garcia, Jesus & Sanjuan, Marco & Padilla, Ricardo Vasquez, 2014. "Automatic control strategies for hybrid solar-fossil fuel power plants," Renewable Energy, Elsevier, vol. 62(C), pages 424-431.
    • Handle: RePEc:eee:renene:v:62:y:2014:i:c:p:424-431
    DOI: 10.1016/j.renene.2013.07.034
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    References listed on IDEAS

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    1. Zarza, Eduardo & Valenzuela, Loreto & León, Javier & Hennecke, Klaus & Eck, Markus & Weyers, H.-Dieter & Eickhoff, Martin, 2004. "Direct steam generation in parabolic troughs: Final results and conclusions of the DISS project," Energy, Elsevier, vol. 29(5), pages 635-644.
    2. Padilla, Ricardo Vasquez & Demirkaya, Gokmen & Goswami, D. Yogi & Stefanakos, Elias & Rahman, Muhammad M., 2011. "Heat transfer analysis of parabolic trough solar receiver," Applied Energy, Elsevier, vol. 88(12), pages 5097-5110.
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    1. Tilahun, Fitsum Bekele & Bhandari, Ramchandra & Mamo, Mengesha, 2019. "Design optimization and control approach for a solar-augmented industrial heating," Energy, Elsevier, vol. 179(C), pages 186-198.
    2. Kicsiny, Richárd, 2015. "Transfer functions of solar heating systems for dynamic analysis and control design," Renewable Energy, Elsevier, vol. 77(C), pages 64-78.
    3. Xiaolei Li & Zhifeng Wang & Ershu Xu & Linrui Ma & Li Xu & Dongming Zhao, 2019. "Dynamically Coupled Operation of Two-Tank Indirect TES and Steam Generation System," Energies, MDPI, vol. 12(9), pages 1-42, May.
    4. Jithin, E.V. & Raghuram, G.K.S. & Keshavamurthy, T.V. & Velamati, Ratna Kishore & Prathap, Chockalingam & Varghese, Robin John, 2021. "A review on fundamental combustion characteristics of syngas mixtures and feasibility in combustion devices," Renewable and Sustainable Energy Reviews, Elsevier, vol. 146(C).
    5. Salazar, Germán A. & Fraidenraich, Naum & de Oliveira, Carlos Antonio Alves & de Castro Vilela, Olga & Hongn, Marcos & Gordon, Jeffrey M., 2017. "Analytic modeling of parabolic trough solar thermal power plants," Energy, Elsevier, vol. 138(C), pages 1148-1156.

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