Research On QoS Technology Of Power Communication Network Based On SDN

The network architecture is increasingly complex and difficult to manage with the expansion of the power communication network.A large number of intelligent terminal equipment access to the power communication network and power business tend to be IP,resulting in greater network bearing pressure.Therefore,the power communication network fails to guarantee the quality of service(Qo S)of the power business,influencing the security and stability of power grid operation.Software defined network(SDN)decouples the functions of the data forwarding and logic control of traditional network equipment.Through the feature of centralized control,SDN can perceive network topology and resource usage,which is to help optimally allocate bandwidth,flexibly schedule business,and improve Qo S.By introducing SDN,the Qo S technology of the power communication network is studied from routing and queue scheduling.The main contents are as follows:(1)The architecture of the power communication network SDN-based is analyzed,and the types and priority of the power business are divided by characteristics and communication indicators.Based on this,the thesis puts forward the overall plan of Qo S control for power communication network.(2)The Qo S routing strategy of the power communication network is proposed by extending the SDN controller.For the production control business of the power grid,a multi constraints routing model is established,which consists of link delay,link available bandwidth,and link packet loss rate.Moreover,the lagrange relaxation based aggregated cost(LARAC)algorithm is used for solving model.At the same time,according to the realtime status parameters collected by SDN,the power business is monitored,and rerouting mechanism is triggered when constraints do not meet.For the daily management business of the enterprise,the shortest path routing algorithm based on bandwidth is used.The results show that the strategy can select a reliable transmission path for power business.(3)The queue scheduling strategy of the power communication network is proposed through the programmable interface of SDN.The priority and hierarchical token bucket(HTB)of traffic control in Linux are used to achieve two-level scheduling in SDN.The different types of power business use priority,and the same type shares bandwidth according to the queue length,power business important,and Qo S satisfaction.The simulation results show that the strategy can significantly reduce the delay of high-priority power business and the packet loss rate of the same priority.In order to improve the Qo S,the thesis studies the Qo S technology of the power communication network from routing selecting and queue scheduling according to the characteristics of SDN.The result shows that the proposed strategy can effectively improve the Qo S of the power communication network,and reduce the end-to-end delay and packet loss rate of the power business by dynamically adjusting bandwidth.