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

Yang Li (), Feilong Hong, Xiaohui Ge, Xuesong Zhang, Bo Zhao and Feng Wu
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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

Energies, 2023, vol. 16, issue 24, 1-22

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.

Keywords: cascaded hydropower stations; renewable energy; optimal capacity configuration; pumped storage; variable-speed units; mixed-integer linear programming (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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