Modelling and Analysis of the Start-Up Phase of a Compressed Air Energy Storage System Under Variable Operating Conditions

Compressed air energy storage technology has outstanding advantages in integrating new energy. It is of great significance to model and study the start-up phase dynamic characteristics of the compression side. A dynamic simulation model for the compression side based on the principles of mass conservation, energy conservation, and momentum conservation has been proposed. To simulate the system's dynamic sliding pressure operation, speed control is applied to the final-stage compressor. Utilizing the simulation model, the dynamic response performance of pressure, mass flow rate, and temperature during the system's start-up process is investigated and analysed. The simulation results indicate that the dynamic model can capture the system's dynamic response performance and variable-condition characteristics during start-up. Due to the backpressure constraints from the storage reservoir and the variable-condition characteristics during start-up, the dynamic performance of the compression side differs from its steady-state performance.