Li Hongxia

General architecture of distributed energy network system

With the continuous growth of urban population, the contradictionnbetweenthe lack of energy resources and environmental pollution hasnbegun to restrict the development of ecological civilization, andnmore and more people begin to pay attention to energy and environmentnproblems. Distributed energy is one of the important ways to solventhis problem. According to the development trend of domestic and internationalnfor distributed energy, China has begun to pay much attention to thendevelopment of distributed energy resources.However, due to changesnin demand from energy end users, external environment and other factors,nthe distributed energy system is often difficult to maintain in thenbest condition for a long time.Due to high investment cost and lownoperating efficiency problems, distributed energy systems are no longernsuitable for large-scale applications in China. A new type of intelligentnenergy network system based on distributed energy system, which integratesnmany kinds of energy networks and information networks, is developed.nThe development of new distributed energy network system will breaknthe current encounter difficulties of distributed energy development,nwith the help of the distributed energy network technology, it willnconstantly improve the system efficiency and economy of regional energynsystem. The technology of distributed energy network is complicated, whichncombines new energy technology, micro grid technology, Internet ofnthings technology, cloud computing and big data technology. In thenpaper, the basic definition, general technical architecture and mainncharacteristics of distributed energy network system is proposed,nand each important part is expounded. the design method of four stagesnenergy loop of distributed network nodes is introduced, and the cooperativencontrol method of distributed energy network system is summed up.nOn this basis, we put forward “system efficiency theory”nof distributed energy network system, and three scientific problemsnin the “system efficiency theory” is expounded. Thenfirst scientific problem is mechanism of the system structure ordering,whichnimpact on the energy efficiency of the system, focus on the influencenof topology in distributed energy network and stability of distributednenergy network systems integrated with renewable energy and naturalngas; the second scientific problem include energy quantity increment,nenergy quality increment and circulation principle of distributednenergy network system, which focus on the active regulation and interactionnbetween supply and demand of distributed energy network system; thenfinal scientific problem is the principle of cooperative control inndistributed energy network system, which based on integration of informationnand energy. Through the energy Eco-city in Hebei Province, design problem ofnfour stages energy loop of distributed network nodes is solved, andnvalidated in the practice. then in the Sino German Eco-Park whichnin Shandong province, energy network design problem of is solved.nIn these two demonstration projects, with the aid of the distributednenergy network system, the technical indicators of these two projectsnhave reached the leading domestic level. These projects full use ofnrenewable energy and natural gas, solve the contradiction betweennenergy and environment. As a demonstration project, the developmentnof new distrabuted energy technology in China will be much helpful.nFinally, the coupling between information and energy of distributednenergy network system is a new kind of representative energy systemnin the world.It also lays a solid foundation for the development ofnenergy internet.