Modeling And Vulnerability Analysis On Special Energy Interent Based Cyber-physical System

With the development of human society,the needs of modern producing and living can be not easily satisified by the traditional energy network with one simple energy carriers.So the interaction coupling of various energy forms has been the energy development trend,which creates the concept,energy internet.And with the application of advanced communication and controlling technology and so on,the energy internet features the combination of cyber system and physical system.Based on this feature,this thesis proposes a two-layer network model of the energy internet and analysed the vulnerability of this model.The specific research contents are as follows:1.The three physical structure of the special energy internet is proposed and there are some related words' concept that can be found in this thesis.And the feature of the energy internet,the combination of cyber system and physical system,is discussed and the information network structure of the energy internet based on the physical structure is shown.Based on these,we divide the special energy internet into the multi-energy carries power flow network and the multi-control network and analyses the cascading failures of these two network.2.Referring to the load flow calculation,energy network that combines the electrical,natural gas,and district heating networks has been focused on and the power flow problem of these network is also solved.According to the result of power flow calculation,the buses or the energy devices can be seen as the node and the transmission lines can be seen as the edges in the power flow network and then the complex network theory can be used to study the complexity of the energy internet.3.Based on the topological model of multi-energy carries power flow network and the structural controllablity theory and the minimum inputs theorem,the minimum number of energy switch can be determined and the topological model can be built.The information transferring processes between the cyber control network and the physical power flow network have also been discussed.Then the model of energy internet based on the coupling multi-layer network is been proposed.4.Based on two-layer network model of the energy internet,this thesis analyze the vulnerability of it.The interaction of cyber network and the physical network has been considerd in this analysis,we can find that the high degree node,high betweenness line and controlled node should be protected from the structure of the special energy internet in order to improve the reliability and ensure the stability of it.Finally concluding the main research works in this thesis and discussing further work.