压缩空气储能技术是应对新能源电力大规模并网消纳问题的可行途径之一。针对传统恒容压缩空气储能系统的空气节流损失、储气室容量浪费等弊端，构建了基于抽水补偿的自力式恒压压缩空气储能系统，建立了压气机、膨胀机、换热器、储气室、水泵/水轮机等部件模型，研究了系统的稳态热力学性能。结果表明：相比同构型绝热压缩空气储能系统，自力式恒压压缩空气储能系统性能显著提高，且与储气压力、水泵进口压力和水轮机出口压力相关。当储气压力等于4.2MPa时，新系统的往返效率和储能密度分别增加1.62个百分点和5.72%，而当储气压力达到7.2MPa时，新系统的储能密度增加2.12倍。

Compressed air energy storage technology is one of the feasible ways to address the large-scale grid integration and consumption of new energy power. A self-operated constant pressure compressed air energy storage system based on pumping dydro was constructed to address the drawbacks of traditional constant volume compressed air energy storage systems, such as air throttling losses and wasted storage capacity. Component models of the compressor, expander, heat exchanger, storage chamber, and water pump/turbine were established, and the steady-state thermodynamic performance of the system was studied. The results show that compared with the isomorphic adiabatic compressed air energy storage system, the performances of the self-operated constant pressure compressed air energy storage system are significantly improved, and affected by the parameters, such as the air storage pressure, the pump inlet pressure and the hydroturbine outlet pressure. when the air storage pressure is equal to 4.2MPa, the round-trip efficiency and the energy storage density of the new system increase by 1.62 percentage points and 5.72%, respectively. When the air storage pressure reaches 7.2 MPa, the energy storage density of the new system increases by 2.12 times.

TM611