Network Integration Of Community-level Distributed Energy Systems With Energy Storage Planning

Distributed energy System(DES)can be flexibly arranged around buildings according to various energy needs of users,realizing energy cascade utilization,with high efficiency,reliability,economy,environmental protection and other advantages.The highly integrated mechanism of energy flow and information flow makes it a new direction for the future development of the energy field,and plays an important role in realizing the green transformation of energy utilization mode,"carbon peak" by 2030 and "carbon neutral" by 2060.However,there are many kinds of devices in distributed energy system,and the diversity of energy flow coupling increases the complexity of planning problems.In order to solve the problems of energy station system configuration and inter-station energy scheduling and management,the joint planning method of regional distributed energy system network based on shared energy storage is studied.In addition,with the increasing proportion of building energy consumption,near-zero energy consumption buildings have become a new direction for the future development of building energy conservation in the world.Taking the community of near zero energy consumption as the research object,the optimization model of building distributed energy system was established.The method of alternating iteration of venot diagram and comprehensive energy load moment was used to determine the site selection of energy station and the power supply area under its control.Combined with the operation characteristics of all kinds of energy equipment in the station,based on the two basic operation strategies of "Heat fixed by electricity"(FEL)and "power fixed by heat"(FTL),the capacity optimization of energy system equipment in the station was studied,and the optimal operation mode of the system was obtained.Using artificial intelligence algorithm,the path planning of power pipeline and heat pipeline in energy station is carried out on the premise of satisfying all kinds of load supply in each load node,so that the cost of network construction is the lowest.On the basis of building system optimization model,energy transmission network is added.From the perspective of overall layout,considering regional load characteristics,in-station system operation strategy and inter-station pipeline complementarity,a network layout planning model of regional distributed energy system aiming at minimum cost is established.The results of the typical daily operation are analyzed hour by hour.The results show that the energy interconnection pipeline can make multiple areas into a whole,unify the planning and dispatching,strengthen the connection between cold,heat and electricity energy networks,and improve the overall economic benefit of the system.Considering the non-simultaneity of loads between different energy stations and the complementarity of surplus energy,aiming at the minimum annual total cost and based on the concept of "sharing economy",a community-level distributed energy system of shared energy storage stations is established.The capacity,location and charge-discharge power of energy storage equipment are optimized by genetic algorithm.The capacity configuration and day-ahead scheduling model of energy storage system are determined,and the economy of sharing mode is verified.