Performance Study of Salt Cavern Air Storage Based Non-Supplementary Fired Compressed Air Energy Storage System

2017 International Conference on Structural, Mechanical and Materials Engineering

材料科学;力学

Xiaotao, Chen^1,2 ; Jie, Song^3 ; Lixiao, Liang^3 ; Yang, Si^2 ; Le, Wang^3 ; Xiaodai, Xue^1,2

Department of Electrical Engineering, Tsinghua University, Beijing

100084, China^1

New Energy (Photovoltaic) Industry Research Center, Qinghai University, Qinghai

810036, China^2

Research Institute of Global Energy Internet, Beijing, China^3

关键词: Compressed air energy storages (CAES);    Electric conversion efficiency;    Energy storage efficiencies;    Energy storage systems;    Operating mechanism;    Performance study;    Storage efficiency;    Storage technique;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/248/1/012007/pdf
DOI  :  10.1088/1757-899X/248/1/012007

来源: IOP

【 摘 要 】

Large-scale energy storage system (ESS) plays an important role in the planning and operation of smart grid and energy internet. Compressed air energy storage (CAES) is one of promising large-scale energy storage techniques. However, the high cost of the storage of compressed air and the low capacity remain to be solved. This paper proposes a novel non-supplementary fired compressed air energy storage system (NSF-CAES) based on salt cavern air storage to address the issues of air storage and the efficiency of CAES. Operating mechanisms of the proposed NSF-CAES are analysed based on thermodynamics principle. Key factors which has impact on the system storage efficiency are thoroughly explored. The energy storage efficiency of the proposed NSF-CAES system can be improved by reducing the maximum working pressure of the salt cavern and improving inlet air pressure of the turbine. Simulation results show that the electric-to-electric conversion efficiency of the proposed NSF-CAES can reach 63.29% with a maximum salt cavern working pressure of 9.5 MPa and 9 MPa inlet air pressure of the turbine, which is higher than the current commercial CAES plants.