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A switchable concentrating photovoltaic/concentrating solar power (CPV/CSP) hybrid system for flexible electricity/thermal generation

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Abstract

Due to the intermittency and indeterminacy of solar irradiance, balancing energy supply and load demand remains a challenge. This paper proposed a switchable hybrid system that combines concentrating photovoltaic/concentrating solar power (CPV/CSP) technology with thermal energy storage (TES) to achieve flexible electricity and thermal generation by adjusting the incident solar flux of photovoltaic (PV). The hybrid system can directly transfer surplus solar energy into high-quality heat for storage using a rotatable PV/heat receiver. The simulated results demonstrated that the hybrid system effectively improves power generation, optimally utilizes TES capacity, and reduces the levelized cost of electricity (LCOE). Over a selected seven-day period, the single-junction (1J) GaAs solar cells used in the hybrid system sustainably satisfied the load demand for more than five days without grid supplement, outperforming the CSP plant by an additional two days. The hybrid system utilizing the 1J GaAs with the base configuration of solar multiple (SM) of 1.26 and TES capacity of 5 h improved the annual power production and renewable penetration (RP) by 20.8% and 24.8% compared with the conventional CSP plant, respectively. The hybrid plant with monosilicon and a configuration of SM (1.8), PV ratio (1), and TES capacity (6 h) achieved an optimal LCOE of 11.52 $ct/kWh and RP of 75.5%, which is 8.8% lower and 12.1% higher than the CSP plant, respectively.

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Authors and Affiliations

  1. Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China

    XinYu Pan, MengDi Yuan, Xing Ju & Chao Xu

Authors
  1. XinYu Pan
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  2. MengDi Yuan
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  3. Xing Ju
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  4. Chao Xu
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Corresponding author

Correspondence to Chao Xu.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. 51821004).

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Pan, X., Yuan, M., Ju, X. et al. A switchable concentrating photovoltaic/concentrating solar power (CPV/CSP) hybrid system for flexible electricity/thermal generation. Sci. China Technol. Sci. 66, 2332–2345 (2023). https://doi.org/10.1007/s11431-023-2453-0

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  • DOI: https://doi.org/10.1007/s11431-023-2453-0

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