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Optimal Capacity Configuration of Pumped-Storage Units Used to Retrofit Cascaded Hydropower Stations

Author

Listed:
  • Yang Li

    (College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China)

  • Feilong Hong

    (College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China)

  • Xiaohui Ge

    (State Grid Zhejiang Electric Power Company Research Institute, Hangzhou 310014, China)

  • Xuesong Zhang

    (State Grid Zhejiang Electric Power Company Research Institute, Hangzhou 310014, China)

  • Bo Zhao

    (State Grid Zhejiang Electric Power Company Research Institute, Hangzhou 310014, China)

  • Feng Wu

    (College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China)

Abstract

As flexible resources, cascaded hydropower stations can regulate the fluctuations caused by wind and photovoltaic power. Constructing pumped-storage units between two upstream and downstream reservoirs is an effective method to further expand the capacity of flexible resources. This method transforms cascaded hydropower stations into a cascaded pumped-hydro-energy storage system. In this paper, a flexibility reformation planning model of cascaded hydropower stations retrofitted with pumped-storage units under a hybrid system composed of thermal, wind, and photovoltaic power is established with the aim of investigating the optimal capacity of pumped-storage units. First, a generative adversarial network and a density peak clustering algorithm are utilized to generate typical scenarios to deal with the seasonal fluctuation of renewable energy generation, natural water inflow, and loads. Then, a full-scenario optimization method is proposed to optimize the operation costs of multiple scenarios considering the variable-speed operation characteristics of pumped storage and to obtain a scheme with better comprehensive economy. Meanwhile, the proposed model is retransformed into a mixed-integer linear programming problem to simplify the solution. Case studies in Sichuan province are used to demonstrate the effectiveness of the proposed model.

Suggested Citation

  • Yang Li & Feilong Hong & Xiaohui Ge & Xuesong Zhang & Bo Zhao & Feng Wu, 2023. "Optimal Capacity Configuration of Pumped-Storage Units Used to Retrofit Cascaded Hydropower Stations," Energies, MDPI, vol. 16(24), pages 1-23, December.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:24:p:8049-:d:1299649
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    References listed on IDEAS

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