Communication Network Of Digital Substation Research

Series IEC61850substation communication network system standard is the latestinternational standards, represents the development direction of the substationautomation system, which uses object-oriented techniques to define an abstract model ofsubstation automation system to provide communication between the IED devices, thedigital substation communication network into station control layer, the spacer layer,process layer, using Ethernet communication, the definition of logical nodes and logicaldevice corresponding function, using communication and information sheet describes theexchange of information between the logical node.Focuses on the real-time and high reliability categories packets: GOOSE messages andSAV packets, they mapped from the application layer of the OSI model to the link layer,using the publisher/subscriber multicast mechanisms, the need for reasonable VLANclassification, packets defined within the corresponding VLAN, it forwards only withinthe appropriate VLAN. A VLAN is a multicast storm prevented the network, improvedata utilization. From the functional modeling, data modeling, mapping and conformancetesting of communication services in four areas in-depth study of the implementationprocess of the IEC61850standard.Communication network structure of digital substation main star, bus, ring and meshtopologies four. To ensure the communication network reliability and redundancybetween the station control layer and a spacer layer using a ring network between thespacer layer and process layer using a star network, an important part of thecommunications network dual.According to IEC61850substation automation system into the process of thecommunication network station station control layer and network layer spacer layerbetween the spacer layer and process layer, network layer. According to the connectivitybetween the three can be divided into two modes: two separate networks and the stationonly network. Rational design of substation communication network structure is animportant guarantee to ensure the protection and control functions within the stationreliability. The redundancy scheme is designed to improve the reliability of critical communications networks, research and analysis of the basic redundant structure: binarytype, but IP network, binary-type independent networks, ring networks, and proposes acentralized standby mode and standby mode for improved cross-type redundancy Istructure. When changing the network topology, only part of the switch updates thenetwork topology information and reduce the impact of network failures range.