Research On Power Service Characteristics Considering Survivability Of Electric Power Communication Network

With the improvement of power grid intelligence and energy Internet construction,the types of services carried by electric power communication network(EPCN)are greatly improved.Demand response(DR)technology is an important way to achieve"carbon neutral",which needs the EPCN to provide support.It's significant to guarantee the reliable transmission of power service for the stable operation of power grid.As the EPCN is transiting from ring to mesh,the traditional linear protection method can't realize the efficient utilization of limited bandwidth resources,the network risk,traffic characteristics and other factors will have an impact on the transmission of power services.The survivability of EPCN considering power service characteristics is studied in this thesis.The specific work is as follows:Firstly,a p-Cycle protection strategy for DR service based on message perception is proposed.The load balancing scheme is used to dredge the network traffic,so that the traffic in the network can be avoided to concentrate on some specific links.Therefore,the network congestion can be effectively reduced and the service routing can be optimized.On the basis of ensuring the reliability of the network,the problem of pathfinding and protection of DR services is solved by the joint optimization algorithm of work path and protective path protected by p-Cycle.The work bandwidth and protection bandwidth are allocated for the service requests to be processed,so as to maximize the utilization of network resources.Secondly,considering the DR characteristics of the services,and put forward a kind of differential protection for DR strategy.This strategy utilizes the idea of resource reservation and bandwidth dynamic release,specifically for different types of user DR service path planning and protection,improve the efficiency of the network reliability and protection,and realize the efficient utilization of bandwidth resources.Finally,a link fault differential protection strategy is proposed to distinguish the quality of power service protection.The link failure risk is analyzed and the service risk in EPCN is modeled.Important degree according to the service and link risk degree is proposed based on the quality of three kinds of protection model,considering the influence of load balancing,network link to a lower risk of business channel,the high degree of important business for independent distribution protection path,on the basis of reuse p-Cycle to protect high risk link,at the same time,both the blocking rate and the risk of network are reduced.