Research On Key Technologies Of Power/Data Integrated Energy Router

As the ideal model of future power grid,the Energy Internet(EI)can adapt to the wide applications of renewable energy resources and energy storage devices,and it has the features of distribution,informatics and intelligence.The energy router is the core device in the El and takes charges of the interconnections of source-grid-storage-load,power quality monitoring,smart power dispatching and fault management,etc.It is a combination of power and information.Recent years,the energy router has arose a lot of interest in both academic and engineering,and is depicted from varies perspectives like function definitions,hardware designs and algorithm designs,etc.Referring to the hierarchical design of the Internet,a down-up three-layer structure is applied to the energy router design.In the physical layer,power flow and data flow are integrated.In the link layer,data is packed and transmitted reliably.In the network layer,data flow helps achieve energy routing.As a result,power can be dispatched and managed flexibly,efficiently and intelligently in the energy local area network.This paper starts with the two key technologies in the energy routers,which are communications and power electronics,and deconstructs the energy router from a new perspective.The essential similarity and unity between power electronics and communication system are first proposed,based on which,the power/data integration method is proposed.More details about this method are given and optimized modulation methods are proposed,so that the physical layer design is completed.Further,the link layer frame structure is defined and error check is achieved.Besides,power dispatch among interfaces in the energy router is discussed.Finally,based on the discussion of power transmission mode,forwarding structure,etc.of network layer,a graph theory based energy routing algorithm is proposed to achieve power dispatching in the network layer.Till now,the three-layer energy router design is completedFirst of all,this paper gives deep study and comparison of communication and power electronics,revealing their common essences and similar operation principles.Then,it deconstructs the power electronics and gives deep analysis of operation principles based on modulation and demodulation theory.Based on the analysis,power/information integration technique is proposed.Then two methods,which are power/data single carrier modulation and power/data double carriers modulation,are given,and their properties are analyzedSecond,this paper gives further analysis and verifications of the proposed two power/information integration methods.It proposes the advanced modulation methods,such as spread spectrum,to optimize the performance of power conversion and communication.Operational principles analysis and experimental verifications are both given.Third,this paper gives physical layer design of energy router based on power/information integration method,including hardware structure,interface circuits,operation modes,and communication channel modeling,etc.Besides,in the link layer,data frame is defined and power dispatch method is given.Based on the analysis above,the energy router prototype is designed and constructed for experimental verification.Finally,referring to the Internet,the network layer design is given.A graph theory based energy routing algorithm is proposed,and it is optimized in heavy and light load conditions respectively.Case studies based on MATLAB and experimental verifications are given.