Research On Circuit Topology And Control Strategy Of Small Energy Router

Nowadays,the energy system,which is mainly supported by fossil energy,is an unsustainable and lowly utilized energy networks.What is more,human is increasingly dependent on energy.Therefore,the current energy system is urgently needed to be transformed into a distributed eco-and renewable energy system.Energy Internet,which combines energy technology with Internet technology,is the development trend of energy reformation.The rapid development in these fields,such as information processing and analysis technology,energy production,transmission and storage and so on will certainly help the energy Internet evolve into a wise and smart Internet system.Thus,the construction of energy Internet will provide us with a stable energy supply system.Similar to the traditional Internet,the energy Internet uses energy routers as access points for various energy subnets,energy loads,energy storage units ect.Therefore,the construction of energy routers as the core device for the energy Internet will be an important step in the construction process of energy network.Energy routers,with the functions of energy distribution,regulation,scheduling,management and so on,will ensure the safety,stability and reliability of energy Internet.According to the specific position of energy router in the energy Internet,this paper will divide it into two categories:(1)large energy routers;(2)small energy routers.Due to the limited length,this paper only analyzes and designs the small energy router.The small energy router will be divided into three components in this paper:(1)solid state transformer;(2)control system;(3)intelligent interface.In the part of solid state transformer,this paper will focus on its structural design and control strategies.Solid state transformer consists of cascade input stage,isolation level and output stage.In this paper,based on the small-signal model theory,the author models the input stage and isolation level for the solid-state transformer,and uses the closed-loop controller to control it,so that the solid-state transformer can reach the given signal quickly and accurately.In the aspect of energy coordination and management,this paper puts forward the hierarchical control strategy for the main target,which can improve the energy utilization ratio and make the energy distribution more reasonable while it is stably operating.Similar to the traditional Internet,there are also "congestion" and "unbalanced" problems in the energy network.Therefore,this paper combines the energy with information and apply the method which the traditional Internet have used to solve these above problems into studying and designing a router-controlling strategy which aims to deal with the information and energy congestion problem.In the fifth chapter,the above design model and control strategy are simulated and verified by physical experiment.