[Objective] To address the unclear dynamic mechanisms and the lack of research on thermo -electric coupling fault characteristics during the discharge and power generation process of a 350 MW Advanced Adiabatic Compressed Air Energy Storage (AA -CAES) system, this paper c onstructs a dynamic model for the discharge power generation side. This model can reflect the internal dynamic behaviors of key components and grid-connection transient characteristics, aiming to provide a theoretical basis for the dynamic performance evaluation and fault mechanism exploration of large -scale AA -CAES systems. 

[Methods] A dynamic model encompassing air storage tanks, control valves, multi -stage expanders, heaters, and a fourth -order synchronous generator was built based on the Python platform . On this basis, dynamic simulation research was conducted under various operating conditions and disturbance scenarios. The analysis includes the impact of different initial air storage pressures and control methods on the system's dynamic performance, as well as the transient characteristics under heat -side faults, electrical -side short -circuit faults, and thermo -electric coupled complex faults. Through comparative simulations, the response characteristics of system variables such as output power, terminal voltage, valve opening, and control pressure were investigated to reveal the influence patterns of 2 operating conditions and fault combinations on the stability and recovery capability of the power generation side. 

[Results] The simulation results indicat e that the initial air storage pressure and control methods significantly affect the system's dynamic response and output power. A higher air storage pressure leads to a stronger power increase capability after a disturbance and a relatively smoother regulation process. The fault analysis results show that heat -side faults cause the valve opening to continuously increase, reducing the regulation margin. Electrical-side short-circuit faults mainly affect the recovery process of terminal voltage and output po wer, and different fault types cause varying degrees of disturbance. When a heat -side fault is superimposed on a short-circuit fault, the system's recovery process becomes more complex, and the control pressure further increases. 

[Conclusions] The dynamic model of the power generation side constructed in this paper can effectively reflect the transient response characteristics during the discharge power generation process and under grid-connection disturbances. It enables dynamic simulation and transient an alysis under multi -operating conditions and multi -fault scenarios, revealing the influence patterns of initial air storage pressure, control strategies, and thermo-electric coupled faults on system performance. This study can provide a valuable reference for the dynamic analysis, control optimization, and fault mechanism research of the AA -CAES discharge power generation side, while also providing technical support for the safe and stable operation and future engineering applications of large-scale AA-CAES power stations.