Study On Fault Propagation Of Chemical Material Network Based On Cascading Failure Theory Of Complex Network

In complex network,the failure of one or a few nodes will cause the failure of a part of the network or even the collapse of the whole network through the coupling relationship between nodes,which is called cascading failure.The chemical production process involves many production units,and the materials between each production unit are closely related,forming a complex material network.In this material network,a small fault is easy to lead to cascading failure phenomenon,thus leading to cascading fault.It is of great theoretical value and practical significance to study cascading fault propagation in chemical material network,which is helpful to prevent and deal with cascading fault effectively and ensure the safe and stable operation of chemical production.The paper mainly studies from two aspects.On the one hand,the cascade fault risk propagation path of chemical material network is studied.Firstly,based on the complex network theory,the chemical material network model was constructed,and the SRank algorithm was applied to identify the important nodes in the network,which was used as the basis for selecting nodes under the attack mode of important nodes.Secondly,the fault propagation intensity is defined by the fault propagation probability and material hazard degree.By defining the initial load,load capacity and load distribution rules,a cascading fault propagation model was built to obtain the fault propagation probability.Based on the rough set theory and analytic hierarchy process(AHP),the index weights of flammability and explosiveness,toxicity,and corrosiveness are calculated to get the material hazard degree.Finally,based on the fault propagation intensity,the risk propagation path of cascaded fault of chemical material network under important node attack,high load node attack and random attack can be obtained.This method is compared with other method,and the feasibility of this method is verified.On the other hand,based on the established cascading fault propagation model,the fault source location of chemical material network is studied.Firstly,the observation nodes are selected from the network by a random selection strategy.Secondly,the breadth-first search strategy is used to search the region where the fault source node may be.Then the fault source node is located by the time-reverse back propagation algorithm.Finally,the selection strategy of observation nodes is changed to study the positioning accuracy in each case,so as to obtain the optimal selection strategy of observation nodes.The case study shows that the method proposed in this paper can effectively find the weak links in the chemical material network and determine the cascaded fault propagation path with high risk,which provides the relevant basis for the prevention of cascaded fault and the selection of key monitoring variables.In addition,this method also provides a new idea for fault source location,reduces the complexity of fault source location,and can lock the fault source more quickly when the fault occurs,so as to ensure the stable operation of chemical production engineering.