Optimal Operation Strategy Of Distributed Energy System Based On Different Load Demand Characteristics

In recent years,due to its advantages of energy saving,emission reduction,and high energy efficiency,the Distributed Energy System(DES)has received widespread attention at home and abroad.At the same time,it is also faced with technical constraints such as complex system structure,irrational operation strategies,and difficulty in solving optimal models.Therefore,this article studies the formulation of the optimal operating strategy for distributed energy systems and the establishment of a reasonable optimization model.The main contents are as follows:(1)The DES modeling problem is studied,and the Separate Energy System(SE),Natural Gas Combined Cooling Heating and Power System(CCHP),and hybrid energy distributed system(Hybrid Energy Distributed System,HDES)energy flow model,and established the output model of the main energy supply equipment.(2)Aiming at the selection of typical load demand day,the accurate k-medoids clustering method was used.In the process of optimization,the problem of data redundancy and huge calculation amount caused by a large number of load demand data input is solved.In addition,load demand characteristics of distributed energy system were analyzed based on typical load demand day.(3)The basic energy supply situation of DES was studied under two conventional operating strategies: Following Thermal Load(FTL)and Following Electricity Load(FEL).On this basis,the work of the main energy supply equipment of CCHP and HDES was analyzed.Aiming at the problem of the high mismatch of power supply and heat supply in the FTL and FEL operating strategies,this paper proposed Following Characteristic Load(FCL),that was,according to different load demand characteristics,let the energy supply equipment match different user load demands.(4)Aiming at minimizing total annual costs and annual carbon dioxide emissions,under the FEL,FTL,and FCL operating strategies,a multi-objective optimization model was established to optimize CCHP and HDES.First,the augmented ε-constrain method was used to solve the model.Then established reference cost growth rate and reference carbon dioxide emission reduction rate evaluation standards,combined with TOPSIS multi-objective decisionmaking method based on weight allocation and multi-criteria evaluation model based on AHP and GRA,to make decisions and evaluate on the best implementation of CCHP and HDES under FEL,FTL and FCL operating strategies.Finally,a dormitory building in Nanjing area was used as a reference building.After simulating the basic situation of its load demand,CCHP and HDES were implemented respectively.The results show that CCHP has the advantage of lower annual total cost,while HDES has the advantage of lower annual carbon dioxide emissions.Under the FCL operating strategy,both CCHP and HDES can obtain the maximum environmental benefits while ensuring a reasonable annual total cost.