Research On The Preconfigured Cycle Based Survivability Of Electric Power Communication Network

As an indispensable platform support of the Internet of Energy(IoE),the electric power communication network(EPCN)is essential for realizing the equipment control,intelligentization and interaction of smart grid.At present,EPCNs mainly use“1+1”to provide redundant channel for important services,or use self-healing ring for automatic switching in case of failure.With the gradual deployment and advancement of IoE,the access objects of EPCN will be more extensive,which requires the EPCN to be capable of providing wider bandwidth and possessing more flexible bandwidth access ability and stronger service recoverability.It may cause bottlenecked links and service congestion if EPCNs still adopt the traditional protection methods to provide backup channels for services with large changes in characteristics extensively.Based on the above problems,this thesis studies the survivability of the EPCN based on the preconfigured cycle.Firstly,the present situation of EPCN's topology and its services are analyzed in detail.Considering the characteristics of electric communication services and the link properties of electric fiber network,an enhanced failure independent path protection p-cycle(FIPP p-Cycle)algorithm is proposed for unicast request by designing the multiplexing mechanism of FIPP p-Cycle and the traffic grooming strategy.Simulations results verify that the algorithm can take the full advantage of the protection potential of p-Cycle to decrease the redundancy of the EPCN.Secondly,by analyzing characteristics of multicast services in EPCN,a protection algorithm based on flow p-cycle is designed for to protect multicast service requests.By optimizing the multicast tree and designing a heuristic p-Cycle generation algorithm suitable for the routing tree,the algorithm can efficiently protect multicast traffic requests.The algorithm shows good resource utilization ability under the scenarios of different number of destination nodes for multicast requests.Especially,its performance is excellent when the multicast group size is relative small.Finally,an efficient service protection algorithm based on pre-cross-connected trail(p-Trail)is proposed,which can realize the routing equalization and efficient protection of mixed unicast and multicast services simultaneously by p-Trail which is not constrained by the topological structure.Its validity is verified in the actual EPCN simulation environment under the condition of different network state and service proportion.