| The shortage of fossil fuels and the deterioration of the environment have made the rapid rise of renewable energy.However,the instability and discontinuity of renewable energy have a direct impact on the safe and stable operation of the power grid,resulting in inadequate of grid acceptance capacity and a serious phenomenon of abandoning wind and solar energy.Energy storage system in conjunction with renewable energy can improve the utilization of renewable energy,effectively solve the problem of renewable energy grid connection,and enhance the security of power grid operation.At present,the relatively mature large-scale energy storage technologies include pumped hydro storage(PHS)and compressed air energy storage(CAES).Compared with PHS,CAES technology has a series of advantages,such as flexible site selection,large energy storage capacity,low cost,high safety and reliability,and fast response speed etc,so it has great commercial potential and application value.In order to further study the operation characteristics of advanced adiabatic compressed air energy storage concentrating solar power(AA-CAES+CSP)systems,the relevant model is established on the basis of AA-CAES system,and using MATLAB software to joint solution of Relevant Thermodynamic Processes.The main research contents are as follows:(1)The thermodynamic model of AA-CAES system was established.The influence of cycle number and pressure ratio range of air storage chamber on system performance is analyzed,and the variations of pressure ratio and temperature of air storage chamber during the single cycle are revealed.(2)A coupling system of AA-CAES+CSP is proposed,the thermodynamic model of the coupling system is established and compared with the AA-CAES system.(3)Considering the operation strategy of AA-CAES+CSP system,the effects of two ways of adding solar auxiliary heat system on the system are simulated and analyzed,and the effects of external factors such as solar collector temperature,ambient temperature and energy storage and release interval on the system performance are explored.(4)Based on the research on the operation strategy of AA-CAES+CSP system,the influences of key structural parameters,such as compression expansion series,convection heat transfer coefficient and pressure ratio of air storage chamber on the system performance were analyzed under the given operation parameters. |
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