The impact of key parameters on the cycle efficiency of multi-stage RCAES system

Due to the uncertainty and anti-peaking nature, large scale integration of renewable energy imposes great challenges to the operation and dispatch of power systems. Compressed air energy storage (CAES) system provides new ideas to solve this problem as its characteristics of fast regulating, flexible location and long-service life. Especially, regenerative compressed air energy storage (RCAES) system is widely concerned as its capability of heat recovery in the compression process. The cycle efficiency is a key indicator of RCAES system which can be significantly impacted by the key parameters of the systems including compression ratio, exhaust air pressure of throttle (EAPT) and the maximum working pressure (MWP) of compressed air storage vessel (CASV). However, current research mostly focuses on the thermodynamic process and few studies have focused on the impact of key parameters on RCAES system. Based on the efficiency evaluation method which was formulated through the electrical-mechanical-thermal dynamic process and measurable parameters, the impact of key parameters on the cycle efficiency of RCAES system is analyzed in this paper and a practical RCAES design scheme is adopted for case study.