Research On Communication Network Invulnerability In Complex Large Power Grid

Complexity science is an important subject that abstracts and describes complex systems.It focuses on the researches on the topological features of system structure.The actual network structure and operating characteristics of the practical networks such as the Internet,power network,transportation network and others can be discussed and summarized by the complexity science,but there is not a unified model widely used to describe the complex network among these different actual complex systems.In recent years,with the proposal and development of smart grid,the integration and fusion trend of power system and communication network technology is increasingly improved,and so is the scale of the power users.As an important part to guarantee the stable operation of the power system,the communication network faces growing threats as well.So the reliability of power communication network still takes a significant part of the current study.Aiming at the typical structure of abstract complex network,the characteristics measurements and causes of cascading failure of complex network structure has been classified and summarized firstly.Focusing on the actual data communication network in power system,we propose a DWS hierarchical network structure model.Meanwhile,simulating the network structure evolution by adding a certain scale of hidden nearby connections under the different near connection distance parameters.Then considering the load redistribution process for communication nodes and discussing the cascading influence of network failure process caused by malicious attack,which shows how the connections accessing strategy impacts the network reliability.According to the spreading phenomenon of malicious information in the information system,an invulnerability analysis method based on power and information independent network model is presented.With the propagation capacity of infected nodes and the possibility against adjacent propagation of normal nodes,at the same time,the infected nodes can also trigger the corresponding power nodes the cross layer infection with a certain probability.Combining with the power network flowing distribution process,we ultimately obtain the spreading extent of failure influence in the whole network.This scheme can quantify the importance degree in information propagation process based on the propagation effect of every single information node.At last,it can be verified that the protection of important propagation nodes can effectively improve the network invulnerability under the random network attack mode.Based on the thorough analysis of the characteristics of power communication network structure and the consideration of the cascading failure process,this paper provides a more reasonable and effective network reliability evaluation scheme respectively based on the network topology and information interaction level,and has a certain reference value for the research on power network security risk areas.