Robust Research On Power System Communication Network Based On Dual Network Coupling Relationship

With the development of social economy and information technology,different kinds of infrastructure networks usually serve people in a cooperative way.There are few isolated networks in reality,and most of the networks are uaually interdependent with other networks.The previous researchs on the robustness of single networks are not applicable to today's infrastructure networks.In order to provide reasonable defense measures and effective protection measures for the real network system,the coupling relationship of the interdependent network should be studied.Takes the power system communication network as the research object,takes the complex network theory as the basis,and takes "the robustness of the dependent network" as the main line.The protection strategy of the power system communication network under the static load model and the routing strategy considering the coupling relationship under the dynamic load model are studied.The results of this study are as follows:Firstly,starting from the single network topology models and statistical parameters,the interdependent network models suitable for the power system communication networks is summarized,which are one-to-one dependent network models,partially dependent network models,one-to-many dependent network models and many-many dependent network models.At the same time,the applicable conditions of these models are also described.On this basis,the vulnerability of the power system communication network is summarized.Besides the influence factors of single network vulnerability,the influence of dependency relationship on the vulnerability of dependent network is explained from the aspects of dependency edges and network topology similarity.And several measures of improving the robustness of interdependent networks is summarized as follows:first,increasing the proportion of the autonomous nodes,and try to choose the high value node as the autonomous node;second,selecting two way edges as the interdependent edges,and improving the dependency redundancy;third,improving the topological similarity between subnets;fourth,protecting the important nodes.Secondly,the one-to-one static load dependent network model is established to study the protection strategy against the deliberate attack of the dependent network.In order to make the protection measures more efficient,the key nodes of the network are selected for protection.The selection of the key nodes combines the global and local parameters of the network node pair,in which the betweenness is the global parameter and the maximum neighborhood connectivity is the local parameter.Without changing the network topology,a node state prediction is proposed,which determines the protection nodes in next step by judging the state of the protection nodes and their capacity to accept the additional load in advance.The strategy not only prevents the failure of key nodes,but also improves the utilization efficiency of network nodes,and finally weakens the influence of cascading failures.Simulation results which are derived from the one-to-one BA-BA network platform show the effectiveness of the protection strategy in improving the ability of dependent networks to resist attacks.Finally,the dynamic load network model and the communication network flow model are established.The coupling relationship of the power system communication network is analyzed according to the coupling characteristics of the power system communication network and the way of information transmission.On this basis,the papar simulate the fault propagation mechanism between the power grid and the communication network and propose a communication network routing strategy based on the coupling relationship of the power system communication network.It points out that the congestion of communication nodes causes the failure of the grid nodes,and the failure of important grid nodes not only destroys the network connectivity of the power grid,but also aggravates the congestion level of the communication network.Therefore,the node importance of the power grid is integrated into the routing strategy of the communication network.At last,the influence of different weighting factors on the power grid and the communication network is proved by simulation.And it compares the routing strategy considering the characteristics of the grid nodes with the traditional communication network routing strategy,which proves the rationality and superiority of the routing strategy.