Research On Robustness Optimization Of Interdependent Network For Cascading Failure

With the rapid development of modern science,the infrastructure system is becoming more and more complicated.The interrelationship between different systems becomes more and more closing.The analysis in the past only for the robustness of a single network can not be applied to the current complex interdependent network system.It is possible to find the strategy to improve the robustness of the network more accurately by studying the robustness of the interdependent network in the cascading failure.Based on the theoretical knowledge of the interdependent network,this paper focuses on the thread of "the robustness optimization of interdependent network" and studies the edge protection strategy of the interdependent network and the optimization strategy of the interdependent network based on the limited resources.First of all,this paper has carried on a more comprehensive summary of the research on the popular problem-interdependent network in recent years.It makes the summary from four aspects,such as the basic concept of the interdependent network,the cascading failure mode of the interdependent network,the load reallocation model of cascading failure and the measure of interdependent network robustness which provides a strong reference for future work.Secondly,we study the effect of different link addition strategies on the robustness of interdependent network with different structures in this paper.The paper puts forward a new link addition strategy aiming at the partial coupling and one to one full coupling networks,respectively,low relative betweenness link addition(7)BA-BB(8)and low relative betweenness coupling link addition(7)BA-XY(8).Then,we make it compared with several existing link addition strategies.The simulation results show the effectiveness of the proposed strategy.In addition,the effects of load parameters ? on link addition strategies are further studied.Simulation results show that with the increase of ?,the network robustness increases with the increasing of edge's number.However,a different ? may lead to a failure of a link addition strategy.Therefore,it is better to improve the robustness of the network by fully considering the value of ? and selecting the appropriate adding method.Our work can provide guidance on how to allocate limited resources to an existing interdependent networks system and optimize its topology to improve the robustness of the network.Finally,this paper introduces the concept of limited load capacity into the interdependentnetwork,constructing the interdependent network model with the typical BA scale network and the ER network as the basic sub-network respectively.On the basis of the optimal allocation of the remaining capacity,a new model of node capacity's reasonable dynamic allocation is provided under the limited resources.Also we compared it with some of the existing strategies.The simulation results show the effectiveness of the proposed model.At the same time,it is found that the model proposed in this paper works better in BA network compared with ER network.And it can effectively improve the robustness of the network to select suitable value of L and ?,which represent the load distribution parameters.Our work can provide guidance on how to allocate limited resources to construct a network with better robustness.