In building applications

electrical load and thermal load vary significantly.And they are not synchronized.Therefore

the mismatch issue between energy supply and demand should be solved.The use of thermal storage systems could help improving energy demand coupling with energy generation profiles.The former researches pay attention on the influence of the size of the thermal storage.In this paper

the influences of three thermal storage strategies(TSS)on CCHP system are evaluated and analyzed.Firstly

the dynamic and control model is built by using TRNSYS and MATLAB software.Secondly

the principle and distinction of these three TSSs are analyzed.The traditional thermal strategy(TSS1)determines the operation of power generation Unit(PGU)only by the energy demand of the building.The active thermal storage strategy(TSS2)determines the on-off operation of PGU only by the state of the storage tank.The novel thermal storage strategy(TSS3)determines the operation of PGU by both energy demand and the state of the tank.Lastly

the impacts of TSSs on the performance of CCHP system are evaluated and analyzed through a case study of a hospital in Shanghai.The results show that TSS3 has the best performance.Compared with TSS1 and TSS2

operation time of PGU is longer

and more electric and thermal energy are produced by PGU to satisfy the demand of building with the same size of the storage tank.It is said that the storage capacity of the tank is effectively used to improve the performance of the system.When electricity produced by CCHP system cannot sell to the grid

the energy saving potential of CCHP system is significantly limited.