Research On Cross-Layer Resource Optim Ization Technology Considering Emergency Demand Response Business Channel Risk

Demand response is a new kind of intelligent power business,which is an important technical means to ensure the balance of power supply and demand in the future.As one of the most reliable demand response services,emergency demand response has been paid more and more attention to the survivability of its service channel.In the current power communication network,only the relay protection and other important services are configured with self-healing ring to complete the switching after the failure.In the future,with the increase of controllable terminals on the user side and the increase of demand response traffic,the self-healing ring protection method will lead to the rapid depletion of protection resources,thus reducing the overall performance of the power communication network.In order to solve the above problems,this paper proposes a cross layer joint protection method for emergency response service channel based on the link protection method of IP network and optical network,which effectively improves the protection efficiency.First of all,through analyzing the information interaction mode of demand response business,the characteristics of demand response business information flow are extracted.According to the characteristics of its service transmission,a demand response oriented network coding p-cycle(DR-NCPC)protection method is proposed by designing a network coding preconfigured cycle(p-cycle)expansion method.Simulation results show that the algorithm can effectively improve the protection efficiency according to the characteristics of demand responsive traffic flow.Secondly,the paper studies the link risk of power communication network,puts forward the link risk evaluation model,and designs the routing and protection algorithm for the emergency demand response service.The algorithm provides different routing algorithms for different services according to the importance of services and the topological structure of the p-cycle,which fully guarantees the communication reliability of important services.And this routing algorithm makes the traffic distribution in the network more suitable for the protection of the preset ring,so as to reduce the protection redundancy in the network.Finally,combining the characteristics of IP network and optical network,a cross layer joint link protection method is proposed.This algorithm uses the computing power of IP layer nodes,uses network coding to provide fault switching for services in IP layer,and uses p-cycle to protect links in optical network to avoid secondary protection between IP layer and optical network.Finally,the simulation results show that the algorithm reduces the cost of protecting resources in the network.