Coupling Research Of Energy Storage And Distributed Energy System

As a new energy-saving and emission-reduction technology,Combined Cooling Heating and Power(CCHP)system can use exhaust heat to refrigerate and heat while providing power,which could meet the user's cooling,heating and power.Compared with traditional energy system,it greatly reduces energy consumption and carbon emissions.The system is small and flexible,close to users,can change different configurations,and is easy to be coupled with renewable energy such as wind energy,solar energy and so on.It has great potential for development.In addition,distributed energy,as a supplement to the traditional energy supply mode,provides power support for distribution network through active regulation,and improves the reliability of power supply.However,the user's cooling heating and power is three-dimensional fluctuation,and there is no internal relationship between them,while Combined Cooling Heating and Power system output is one-dimensional change according to a certain proportion.The three-dimensional change of user's load and the one-dimensional output of the system will often cause the mismatch between the supply and demand of the load,resulting in the decline of energy saving of the system.Therefore,coupling the energy storage system with the distributed energy system could actively regulate the output of the distributed energy system through the energy storage system,which is one of the important means to regulate the system output and user's load demand.In this paper,the coupling research of energy storage and distributed system is carried out from three aspects,namely,Combined Heating and Power(CHP),building-type distributed combined cooling heating and power system,and building-type distributed combined cooling heating and power system coupled with solar energy.Based on this,the models of distributed cogeneration system with heat storage,new CCHP system coupled with compressed air energy storage and gas turbine,new CCHP system coupled with solar energy storage and compressed air energy storage and gas turbine are established.For the combined heating and power system with heat storage,this paper constructs a CHP system with micro-gas engine or internal-combustion engine as power unit,evaluating the system performance from three aspects of energy saving,environmental protection and economy.The influence of system configuration,installed capacity and operation strategy on the system is quantitatively analyzed.For the new type of CCHP system coupled with compressed air storage and gas turbine,a new type of CCHP system coupled with energy storage and gas turbine is established,and the corresponding mathematical model is established.The operation characteristics of each component are analyzed,and the operation performance of the coupling system is studied.For the new type of CCHP system coupled with solar energy compressed air storage and gas turbine,the components of the new type of CCHP system are discussed.The operational characteristics of the new CCHP system are analyzed.The influence of pressure difference between energy storage and release on the coupling system is studied.The energy saving rate,efficiency and energy utilization coefficient of the new CCHP system under different energy storage rates are also studied.