Different energy inputs exist during the operation of wind-compressed air combined system

which makes the system performance evaluation turn more complicate.To accurately measure the characteristics of storage

release and transfer of the wind

a new method evaluating the energy consumption and economy of the wind-compressed air energy storage system was proposed

on the basis of the second law of thermodynamics and the principle of thermoeconomics.The ratio of wind exergyαand ratio of wind exergy costγwere firstly used in the new method to analyze the energy loss and the cost in charging and discharging wind energy process in detailed when there were different energy sources in the wind-compressed air energy storage system.The results show that the discharging wind energy exergy cost of the wind-compressed air energy storage system was 1.038yuan/(kW·h)

while the cost of the wind exergy discharging accounts for 85.71% and this proportion would be increased with the increase of wind power costs and decrease of nature gas prices.Therefore

this study not only supplies the theoretical reference for the future research of analysis methods

but also is a theory basis for energy storage subsidy.