Off-design Characteristics for Expansion Power Generation Process of Liquid Air Energy Storage System | Zendy

Guizhi Xu | Zendy; Zhanfeng Deng | Zendy; Shuangshuang Cui | Zendy; Xingping Shi | Zendy; Chang Lu | Zendy; Lixiao Liang | Zendy; Qing He | Zendy

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Off-design Characteristics for Expansion Power Generation Process of Liquid Air Energy Storage System

Author(s) -

Guizhi Xu,

Zhanfeng Deng,

Shuangshuang Cui,

Xingping Shi,

Chang Lu,

Lixiao Liang,

Qing He

Publication year - 2020

Publication title -

iop conference series earth and environmental science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.179

H-Index - 26

eISSN - 1755-1307

pISSN - 1755-1315

DOI - 10.1088/1755-1315/603/1/012034

Subject(s) - energy storage , electric power system , rotor (electric) , power (physics) , electricity generation , electric power , control theory (sociology) , environmental science , automotive engineering , nuclear engineering , engineering , electrical engineering , computer science , physics , thermodynamics , control (management) , artificial intelligence

In order to study the off-design conditions of energy storage system due to the grid load requirements and the fluctuation of external environmental factors in the process of grid-connected operation and the off-design performance of energy storage system, the dynamic model of expansion power generation of 500kW liquid air energy storage (LAES) system is established. Considering the change characteristics of the adiabatic efficiency and pressure ratio of the expander with flow rate, the dynamic changes of rotor speed, electric power, and valve opening size of LAES system under complex conditions of increasing/decreasing load are simulated. The results show that the stability time of electric power is shorter when the variable load is lower when the load change rate of the energy storage system is kept constant under the condition of increasing/decreasing load. On the contrary, the stability time of electric power is longer when the variable load is higher. The stability time of electric power is 12s when the energy storage system changes from 100% rated condition to 90% working condition. The stability time of electric power is 34s when the energy storage system changes from 100% rated working condition to 60% working condition. Under the condition of variable load, the fluctuation of rotor speed is very small and remains unchanged.

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