Abstract
In order to study the off-design conditions of energy storage system due to the grid load requirements and the fluctuation of external environmental factors in the process of grid-connected operation and the off-design performance of energy storage system, the dynamic model of expansion power generation of 500kW liquid air energy storage (LAES) system is established. Considering the change characteristics of the adiabatic efficiency and pressure ratio of the expander with flow rate, the dynamic changes of rotor speed, electric power, and valve opening size of LAES system under complex conditions of increasing/decreasing load are simulated. The results show that the stability time of electric power is shorter when the variable load is lower when the load change rate of the energy storage system is kept constant under the condition of increasing/decreasing load. On the contrary, the stability time of electric power is longer when the variable load is higher. The stability time of electric power is 12s when the energy storage system changes from 100% rated condition to 90% working condition. The stability time of electric power is 34s when the energy storage system changes from 100% rated working condition to 60% working condition. Under the condition of variable load, the fluctuation of rotor speed is very small and remains unchanged.
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