350MW 级先进绝热压缩空气储能系统动态特性研究

To address the challenges of efficient heai-pressure conversion and full utilization of limited gas storage capacity in compressed air energy storage (CAES) systems for high-efficiency and economical operation, this study focuses on a 350 VIW advanced adiabatic compressed air energy storage (AA-CAES) system. A sliding-pressure gas replenishment operation strategy was introduced to reduce throttling losses during the energy release process? thereby enhancing the overall energy storage-density of the system. By dividing the system into three levels—the energy storage segment, the energy release segment, and the overall system—-full-load thermodynamic calculation models for each component within the system were established. The dynamic operational characteristics of key parameters such as pressure ratio- expansion ratio, and power under different modes and operation strategies across the entire operating range were investigated. The results show that when compressor units and turbine units operate away from their design points, the variations in thermodynamic parameters in the later stages of both compressor and turbine units are more significant than those in the corresponding earlier stages. As the pressure at the sliding-pressure gas replenishment point increases, both the system's operating time and energy efficiency gradually improve? indicating that the sliding-pressure gas replenishment strategy can fully utilize the limited gas storage capacity and effectively enhance the system's energy storage density. A comparison of the dynamic operational characteristics of thermodynamic parameters under different strategies for achieving full power generation indicates that the throilling-sliding-pressure gas replenishment strategy can improve the system's energy efficiency by up to 1. 43% over the full-throttling strategy. The findings provide theoretical support for the full-load operational regulation of 350 MW advanced AA-CAES systems in engineering applications.