Capacity Configuration and Operation Optimization of Cascade Hydropower Combined Energy Storage System Considering New Energy Consumption

doi:10.3969/j.issn.1008-0198.2025.03.003

Abstract

Abstract: With the increasing proportion of renewable energy in the power system, the introduction of pumped storage and electrochemical energy storage in the cascade hydropower station can effectively improve the wind and solar energy consumption. A combined wind power-photovoltaic-terrace hybrid pumped storage-electrochemical energy storage system is constructed. Firstly, the economic optimization is taken as the goal to make the optimal capacity configuration of the grid-connected combined system and the operation of each equipment is analyzed. Secondly, the impact of different wind and solar proportions on the optimal capacity configuration of the system is analyzed. Finally, the change of optimal capacity configuration of the off-grid combined system with different wind and solar proportions compared with the grid-connected combined system is analyzed. The results show that, as the proportion of wind and solar power increases, wind and solar power gradually takes up the main load demand, while the turbine capacity of the cascade hybrid pumped storage plant decreases, and the capacity of the electrochemical energy storage increases rapidly to meet the system demand for energy storage equipment. Compared to off-grid systems, grid-connected combined systems are more flexible with both power supply independence.

Key words: cascade hydropower station, capacity configuration, consumption of wind and solar energy, pumped storage, electrochemical energy storage

CLC Number:

TM715

TiAN Haiping, MO Jian, TAN Xincong, XU Runyi, CHEN Yanqi, ZHANG Ji, HUANG Sheng. Capacity Configuration and Operation Optimization of Cascade Hydropower Combined Energy Storage System Considering New Energy Consumption[J]. Hunan Electric Power, 2025, 45(3): 18-26.

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