Abstract: Advanced adiabatic compressed air energy storage system （AA-CAES） is a clean and environmentally-friendly large-scale energy storage technology, which provides a new solution for renewable energy grid and power peaking. In order to accurately study the impact of compressor on the operating performance of AA-CAES system under variable condition, this paper adds a compressor efficiency model to the traditional model. The results show that compared with the maximum pressure ratio of the gas storage room, the efficiency of heat exchanger has a great influence on the energy storage efficiency. As the heat exchanger efficiency increases by 5 percent, theres an average growth of 2.9% in storage efficiency. The energy density increases linearly with the increased gas storage maximum pressure ratio. During the energy storage stage, the power of the former two-stage compressor in AA-CAES system which operates stably is unchanged, but the power of the third unstable compressor is gradually increased with the gas storage pressure ratio, and the third stage compressor consumes the most energy at the end of the process.

Key words: compressed air energy storage system（CAES）, variable efficiency compressor, thermodynamic model, variable condition, energy storage efficiency