Active Distribution Network Communication Management And Security Research Based On SDN

With the rapid development of smart grid,Information and Communication Technology(ICT)has been applied more and more widely in smart grid,and has achieved remarkable results in the production,transmission and consumption of electric power.The distribution network as a key component of the smart grid,with large scale and complicated structure and a wide range of equipment etc.,with more and more distributed energy storage facilities and access,the traditional distribution network has been unable to meet the business needs of the future development in the construction,to put forward the concept of active distribution network.Active distribution network adopts active management mode and has a flexible topology.It provides a strong guarantee for the safety,economy,timeliness and reliability of the distribution network in the future.In today's information age,software defined network(Software Defined Network,SDN)is a new type of network innovation architecture,implementation of the network control plane and data forwarding plane separation using OpenFlow core technology,effective control,can realize the data stream bottom layer device virtualization and network programming.Users can achieve centralized control of the entire network logic,efficient management of network resources and software programming of network configuration through SDN technology.These characteristics provide a good idea for solving many difficulties encountered in the development of distribution network.This paper proposes an SDN-based active distribution network communication network architecture for the characteristics of active distribution networks and communication requirements,combined with the current emerging SDN technology principles,to monitor the communication status of the entire network through the SDN architecture and obtain the underlying communication equipment.Basic information,etc.Then,based on the acquired underlying communication performance information,a corresponding Quality of Service(QOS)and security assessment model was designed to use Lagrangian Relaxation Based Aggregated Cost(LARAC).The algorithm obtains the overall cost of the communication link,and then applies it as a key parameter to the Ant Colony System(ACS)routing strategy as an important basis in the search process.Afterwards,this paper aims at the problem that the ACS algorithm will fall into the local optimal solution during the search process.The algorithm is improved.When the algorithm falls into the local optimal solution,it can jump out in time,and it can increase the randomness in the search process.Speed up the algorithm's search and convergence speed.Finally,we use the Mininet network simulation software and Floodlight controller,based on the 35 kV/10 kV active distribution network test system based on the IEEE 30-node system transformation,build the simulation network in this paper,using the Iperf network test tool for TCP and UDP.Communication tests embody the superiority of routing strategies by detecting various QoS features in the communication.Experiments show that the model and routing strategy proposed in this paper can realize the effective use of network resources and the secure and real-time transmission of data streams.After relevant performance simulation tests,the feasibility of the relevant design performance of this paper was confirmed.