Advanced Pumped Compressed Air Energy Storage: Systems and Key Technologies

Dear Colleagues,

To accelerate the construction of a low-carbon power system with renewable energy as the mainstay, it is crucial to address the technical challenges arising from the large-scale integration of renewables—such as the spatial and temporal variability of wind and solar resources, and the complexity of their coordinated planning with the power grid. In this context, the rapid development of energy storage technologies has become an urgent need.

Among various energy storage solutions, Pumped Hydro Compressed Air Energy Storage (PH-CAES) stands out by integrating the complementary advantages of both pumped hydro storage and compressed air energy storage. It features high energy density, excellent efficiency, short construction periods, and strong rotational inertia. To promote the academic and engineering progress of this promising technology, we are pleased to launch this Special Issue, titled "Advanced Pumped Compressed Air Energy Storage: Systems and Key Technologies", aiming to introduce and disseminate the latest advances the in theory, system design, equipment manufacturing, modeling, application, control, and monitoring of PH-CAES technologies.

This Special Issue welcomes contributions on, but not limited to, the following topics:

• Optimal design methodologies for PH-CAES systems;
• Coordinated control technologies for PH-CAES systems;
• The design and manufacturing of composite material pressure vessels;
• Thermal energy storage technologies and high-efficiency thermal storage equipment;
• Retrofitting technologies for high-pressure caverns or abandoned mines;
• Heat and mass transfer mechanisms and energy flow coupling in water–air combined chambers;
• Design and manufacturing of high-efficiency pump–turbine units under wide load variation conditions;
• Erosion and wear resistance technologies for hydraulic machinery;
• Impact analysis and mitigation strategies of deep peak shaving on hydropower units;
• Key technologies for hydropower plant trash removal and cleaning;
• Life-cycle safety assurance and economic evaluation of underground cavern linings;
• Design technologies for expansion turbines operating under ultra-wide hydraulic head variations;
• Optimization strategies and control system development for pump–turbine units under ultra-wide operating conditions;
• Safety and stability analysis and high-efficiency operation strategies for PH-CAES systems;

Prof. Dr. Huanran Wang
Prof. Dr. Maogang He
Prof. Dr. Yan Ren
Dr. Lile Wu
Guest Editors

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