To deeply study the dynamic characteristics of liquefied air energy storage system participating in frequency regulation of the power grid

the simulation model of the expansion system of a 12.5 MW liquefied air energy storage was established based on the mathematical model. Combined with the infinite grid model

the parameter changes of the energy storage system under no-load impulse

grid connection and frequency regulation were simulated

and the feasibility and dynamic characteristics of the liquefied air energy storage system as a new auxiliary power grid frequency regulation technology were analyzed. The simulation results show that

the maximum unit value of the expander rotor speed during no-load impulse is 1.013

and the overspeed ratio is 1.3%.During grid-connected power generation

the actual speed unit value and the actual electric power unit value are stable to 1 at 765 s. In the process of grid frequency regulation

the actual power unit value stabilizes to 0.990 within10 s

and the highest actual power unit value is 1.032. This study provides a data reference for understanding the dynamic characteristics of liquefied air energy storage systems participating in grid frequency regulation.