QoS Management System Of Smart Grid Communication Based On SDN

As an important support for a strong smart grid,the power communication network ensures the normal operation of the smart grid in terms of production,transmission and distribution security,operation management,and information exchange.With the increasing demand for quality of service for power communication business,how to improve service quality on the basis of existing networks has become an urgent problem to be solved.As a new type of network architecture technology,Software Defined Network has a unique advantage in improving the quality of network services.Therefore,designing a quality of service management system based on SDN has a certain practical application value and significance.Based on the analysis of the QoS requirements of the power communication network,this thesis designs a QoS management system based on SDN technology.The coordination and coordination of various parts of the system can improve the QoS of the power communication network.First,the differentiated service functional module located in the edge network classify and prioritize service data flows entering the core network.Through the expansion of the application function of the open source controller Ryu,the preset QoS service classification strategy is implemented using the programming.Then,the controller located in the core network generates a link functional module by modifying the open source code,and utilizes the link discovery protocol-to-network link parameters(such as link delay,load,and packet loss rate)used for the interaction between the controller and the switch.Real-time measurements were performed to visualize the status of the network link.Finally,based on the network link conditions and service QoS requirements,Dijkstra's algorithm and Lagrange relaxation algorithm are used to calculate the routing path under multi-constrained conditions.After the design of each part of the management system was completed,the performance of each part of the management system was tested using the NS2 and Mininet co-simulation method.Through the analysis of the test results,it was verified that the management system can improve the communication QoS.