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Regulating outflow temperature for multi-objective operation of cascade reservoirs: A case study

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  • He, Wei
  • Zhang, Xufan
  • Zhang, Jian
  • Xu, Hui
  • Zhou, Hongxing

Abstract

Thermal stratification widely exists in large reservoirs, causing significant inflow-outflow temperature difference (IOTD), which goes against the downstream ecology. Reservoir optimal operation has recently been conducted to regulate the outflow temperature, while its effects for cascade reservoirs urgently needed to be illuminated. Taking the typical Xiluodu-Xiangjiaba cascade reservoirs (XXCR) as study case, this paper had built a multi-objective optimal operation model combing the non-dominated sorting genetic algorithm II (NSGA-II) and a hydrodynamic-temperature model, and the total power generation (TPG) and IOTD were simultaneously considered. The effects of different inflow discharge and global warming scenarios were analyzed. This paper showed the following: (1) The IOTD and TPG of XXCR showed a positively linear relationship with the water level of the superior Xiluodu Reservoir (XLD), instead of the inferior Xiangjiaba Reservoir (XJB). (2) The reservoir with larger water volume and depth (such as XLD) determined the thermal structure and hydropower generation in cascade reservoirs, compared with the inferior reservoir (such as XJB). (3) As the inflow discharge or air temperature increased, the slope between the IOTD and TPG in the Pareto front curve increased. The results of this paper could support the ecological operation for cascade reservoir to regulate the outflow temperature.

Suggested Citation

  • He, Wei & Zhang, Xufan & Zhang, Jian & Xu, Hui & Zhou, Hongxing, 2023. "Regulating outflow temperature for multi-objective operation of cascade reservoirs: A case study," Renewable Energy, Elsevier, vol. 211(C), pages 155-165.
    • Handle: RePEc:eee:renene:v:211:y:2023:i:c:p:155-165
    DOI: 10.1016/j.renene.2023.04.139
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    References listed on IDEAS

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    1. Lifang Zhang & Jianmin Zhang & Yong Peng & Jiangyang Pan & Zhongxian Peng, 2019. "Numerical Simulation of Flow and Temperature Fields in a Deep Stratified Reservoir Using Water-Separating Curtain," IJERPH, MDPI, vol. 16(24), pages 1-16, December.
    2. Ahmadianfar, Iman & Kheyrandish, Ali & Jamei, Mehdi & Gharabaghi, Bahram, 2021. "Optimizing operating rules for multi-reservoir hydropower generation systems: An adaptive hybrid differential evolution algorithm," Renewable Energy, Elsevier, vol. 167(C), pages 774-790.
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