Research On Real-Time Performance Of Industrial Ethernet In Substation Automation System

Communication is the key technique of Substation Automation System (SAS) . The real- time performance, confirmability and reliability of information transmission in commumication network decide the usability of SAS. With SAS changed to more and more complex, the older FCS can't achieve the reqirments because of low speed and disunites of standards, and it needs new high performance communication technology to be used. Because of extensive application, high speed and open standard, industrial Ethernet becomes the first choice of new generation communication network in process bus and inter-station bus of SAS.Shared Ethernet is followed CSMA/CD MAC, so the real-time performance and confirmability of transmission has no assurances. Switched Ethernet can minish or eliminate the collision domain, and it can provide wider network bandwidth, higher real-time performance, freer network configuration, so it can be presented for new communication technology of SAS.In this paper, via analysing the configuration of network, interfaces of data and types of information in SAS, the reqirments of information transmission in SAS is presented. Associated the key techniques of switched Ethernet and the features of SAS communication, the models of SAS communication using full-duplex switched Ethernet and the message models to simulate different information types are built. Using network simulation by OPNET, the real-time performance and reliability of different network configuration is analyed, strongpoint and weakpoint of different network configuration is discussed. In this paper, some application of high Ethernet protocol is discussed, and the transmission media and essential security is also analysed. This paper provides the proof of increasing transmission ability of network and increasing performance of SAS, so the reseach results are significative for design of SAS communication network.