Compressed air energy storage uses low power,abandoned wind power,abandoned electricity to compress the normal temperature and pressure air,and sealed high pressure air in salt caverns or artificial chambers and other high pressure gas storage chambers.The high pressure air is released to drive the turbine during the peak load of the grid.With the progress of the energy release process,the pressure of the high-pressure gas reservoir gradually decreases.In order to make full use of the limited space of the gas reservoir,we need the deep sliding pressure operation of the turbine.Taken a 300MW class compressed air storage air turbine as an example.The air turbine has two expansion stages and the sliding pressure range is 15～9MPa.The operation mode of throttling and air supplement with is adopted.The influence of one stage and two stages of air supplement on economy is compared and analyzed.The optimal design point pressure is the middle value of the pressure range.The two-stage air supplement scheme can reduce the air supplement volume of a single air supply valve to some extent.The design point pressure of the two-stage air supplement scheme is selected as 1/3 pressure of the sliding pressure range,and the opening point pressure of the two-stage air supply valve is 2/3 pressure of the sliding pressure range.
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