A compressed air energy storage system with variable pressure ratio and its operation control. (15th February 2019)

• Record Type: Journal Article
• Authors: He, Qing; Li, Guoqing; Lu, Chang; Du, Dongmei; Liu, Wenyi
• Is Part Of: Energy. Volume 169(2019)
• Page Start: 881
• Page End: 894
• Publication Date: 2019-02-15
• Subjects: Compressed air energy storage -- Variable pressure ratio -- Operation control -- Dynamic model -- System efficiency; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2018.12.108
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The compressed air energy storage (CAES) system generally adopts compressors and turbines to operate under a constant pressure ratio. The system working parameters cannot adapt to load change, which causes the system efficiency to be limited. In order to improve CAES system efficiency, a novel variable pressure ratio CAES system is proposed to change the operation pressure ratio by controlling the opening or closing of valves between compressors and the opening or closing of valves between turbines. The thermodynamic analysis model of variable pressure ratio CAES system is established. The period of energy storage, the power consumption of compressor, the output work of turbine and the charging and discharging efficiency of system are calculated and analyzed for the 500 kW advanced adiabatic CAES system. The results show that compared with the corresponding constant pressure ratio CAES system, in the variable pressure ratio CAES system, the power consumption of compressor is reduced by 12%, the output work of turbine is increased by 17.9% and the charging and discharging efficiency of system is increased by 13.1%. Therefore, variable pressure ratio CAES system can not only significantly improve its energy storage efficiency, but also be easy to realize. Highlights: A novel CAES system with variable pressure ratio is proposed. Changing the series and parallel operation modes of compressors and turbines. The thermodynamic analysis model of CAES system is established. Saving the power consumption of compressor and increasing the output power of turbines. Contributing to increase the charging and discharging efficiency of CAES system.