Compressor bypass extraction and energy storage regulation can improve the performance of gas turbine system. In order to make the gas turbine system run more flexibly and efficiently to match the external load

a cogeneration system coupled with photothermal and compressor bypass air extraction energy storage is proposed. Offdesign mathematical models of air turbine

heat recovery steam generator and solar collector are established. The off-design model for gas turbine compressor bypass air extraction is established by Thermoflex software. The offdesign characteristics of the coupling system is analyzed

to investigate the changes of thermodynamic parameters of the system during the whole running period of energy storage and release. Taking the load of a hotel in South China as an example

the presented system is analyzed and compared with the benchmark co-generation system.The results show that

in a typical day as a cycle

the primary energy utilitzation ratio and exergy efficiency of the presented system is 3.2% and 2.4% higher than that of the conventional cogeneration system

respectively.