Design And Research On Wireless Networking Of Secondary Equipment For Smart Substation

As the core node of the smart grid,the smart substation plays an irreplaceable role in ensuring efficient,reliable and low-carbon operation of the power grid.The new generation of smart substation is developing towards the deployment decentralization,the equipment integration,and the simplification of network structure.How to design and optimize the communication network smart substation of reasonably and proactively is very important for the stable operation of smart substation.Therefore,the research of the secondary equipment networking scheme for smart substation is carried out.The main work and of this thesis are summarized as follows:Aiming at the the complex problem of cable laying caused by the decentralization of protective devices,a hybrid network of smart substation for wireless and wired is proposed.The thesis chooses industrial WiFi of IEEE802.11 standard as the wireless communication technology of hybrid networking,comparing and evaluating various wireless communication technologies by analyzing the delay of in-station message and other indicators,and demonstrating the three common topologies and four typical networking schemes of intelligent substation,and the scheme adopts the wireless network mode of star topology for the station control network and the common wired network mode of star topology for the process layer network.Aiming at the opacity of traffic flow in hybrid network,the traffic flow model of secondary equipment is contructde,and and a calculating method for traffic distribution of secondary equipment based on the analysis of Substation Configuration Description(SCD)is proposed.Finally,some typical examples,providing a basis for network construction and optimization was also given.To solve the problem of network optimization,a Virtual Local Area Network(VLAN)suppression strategy based on optimal path is proposed by the distribution of traffic flow.The strategy uses the weighted and double matrixes to obtain the optimal path,and combines the optimal path,PVID numbering rules and Trunk-Hybrid mode port rules to configure substation VLAN.Based on the above results,a hybrid network is built in the 110 KV scientific researchdedicated smart substation,and then two schemes are compared in the steady-state scenario and the fault scenario.The experimental results show that the hybrid networking scheme can meet the transmission requirements of smart substation.The gapbetween the measured flow of the text VLAN scheme and the calculation flow of the secondary equipment is smaller,which can effectively isolate the packet broadcast domains and improve the overall performance of the network.