Optimization Study Of Household Integrated Energy System Based On Hydrogen Storage

As the epitome of the energy Internet,integrated energy system is internally coupled with a variety of energy supply,storage and conversion devices.It can realize the efficient utilization of energy(especially renewable energy)through the multi-energy complementation and interaction between supply and demand.So,the integrated energy system provides a new idea and a new scheme for alleviating the energy crisis and improving the energy structure.Hydrogen energy has the advantages of high efficiency,zero pollution,easy storage and conversion,high energy density and wide application.Therefore,it is an ideal secondary carrier of renewable energy.In the integrated energy system,using hydrogen energy storage instead of traditional battery energy storage can meet the different load needs of different users.Because it can not only realize the complementary transformation from power to gas,coupling the power network and natural gas network,but also directly make efficient use of hydrogen energy to supply hydrogen fuel for fuel cell vehicles.Firstly,this dissertation researches and summarizes the hydrogen production and storage methods that may be used in the family scenario,and evaluates the economy,environmental benefit and feasibility of each method according to the external reaction conditions,environmental impact,hydrogen production cost and efficiency.Then,according to the operation characteristics of the household integrated energy system,the appropriate hydrogen production and storage methods are selected.It provides a reliable theoretical basis for the subsequent establishment of the optimal capacity configuration model of the household integrated energy system based on hydrogen storage.Secondly,the traditional and hydrogen energy storage household integrated energy system are built according to the structure and operation characteristics of the integrated energy system,which include renewable energy equipment,CHP system,multiple types of energy storage and conversion devices.In view of the cooperate difficulty between CHP system and renewable energy output caused of the existing CHP system's single operation mode and low energy utilization efficiency of P2 G technology,this dissertation proposes measures of switching CHP system operation mode according to the relationship between the load and output of renewable energy and preferentially supplying the hydrogen to fuel cell vehicle.The aforesaid measures can improve the energy utilization efficiency and optimize the operation of the system.Thirdly,this dissertation takes the daily system economic cost,daily potential economic cost,energy supply reliability and renewable energy utilization rate of the integrated energy system as the objective function,and constructs the multi-objective function optimal capacity configuration model of the household integrated energy system.In addition,based on uncertain scenes description,the optimization schemes are completed according to the annual wind data generated by HOMER and the typical daily load characteristics in different seasons.And then,according to the optimization schemes and the optimization objective functions,the particle swarm optimization algorithm based on the penalty function is used to optimize the hydrogen storage household integrated energy system's multi-objective function optimization model.This can improve the system's response ability to uncertain factors and the consideration of different planning needs.Finally,the system comprehensive satisfaction parameter and the future expected cost calculation are proposed in this dissertation.The optimal planning scheme will be determined according to the objective function of the planning schemes in different scenarios and the current/future system comprehensive satisfaction.And then,the capacity configuration and future expected cost of traditional household integrated energy system in optimal planning scheme are calculated.By comparing the difference of objective function,technical economy and operation characteristics between the two kinds of systems in different regions,the feasibility,economy and superiority of hydrogen storage system in the future are analyzed.