Research On The Centralized Control Structure And Algorithm Of Intelligent Power Distribution Communication Network

Distribution network is a network with large-scale, complex structure and a wide variety of devices. The direct reconstruction of distribution network will have many difficulties such as large investment, complexity of technology and construction problems. In this paper, a construction program is introduced to solve the difficulties above. In this program, the reconstruction is based on the existing infrastructure of distribution network, using the technology of SDN(Software Defined Network).In this article, the structure of intelligent distribution communication network and relevant routing strategy is designed. In the design of network structure, the logical design is in hierarchical way. The whole network is specified into base network and top network based on distribution voltage level. the lOkV and 35kV is base network and communicate by Openflow, the 110kV is top network and communicate by IP. in physical design, the SDN switches are composing the data transfer layer and deployed based on the location of concentrators in the local access network. The control plate is designed in hierarchical structure. The access layer controls base network and constructed in distributed mode, the backbone layer controls top network and constructed in active-standby mode. the design of controller is based on Openflow, its operating logic follows the flow table. In the network management system, SNMP protocol have been designed to manage the information with Openflow format, MySQL database has been used for data storage and interaction has been designed in Web mode.The routing strategy is designed in transition strategy with SDN and IP. this design is aimed at achieving the virtual network of SDN networks which are connecting with IP networks. This strategy consists of 3 steps:topology discovery in single SDN network, IP address obtaining of edge switches and virtual network construction. Topology discovery in single SDN network is by the broadcasting of LLDP datagram. IP address of SDN edge switches is set by SDN controller based on the broadcast information from IP routers. the virtual network construction is based on the SDN topologies had been obtained. These topologies can integrated into SDN virtual network by the SDN edge switches topology.