Research Of Network Communication In Substation Automation Based On Embedded Ethernet

With the continuous improvement of Substation Automation and the implementation of IEC61850 Standard (Communication Networks and Systems in Substations), the use of Ethernet is imperative under the substation. And a new way is provided for Substation Automation network communication by the appearance of embedded Ethernet technologies.In this thesis we set out from the way of the application of embedded Ethernet in Substation Automation System. Under the analysis of the characteristics of Substation Automation network communication, dynamic simulation method is used to study the real-time performance of the network, and a network communication platform which be based on embedded Ethernet is designed to resolved the problems of information transmission between the embedded devices and the Ethernet.Firstly, the thesis discusses the communication protocol, network-level, data interface and the scheme of Group Net. The distribution and characteristic of data flow within substation are studied systemically, and the mathematical models of different kinds of data flow within substation are developed according to their statistical characteristics. Secondly, taking into account the demands of the real-time performance, the delay composition of the Network is studied, with the message rule, substation communication network simulation models are built, and the network delay of embedded Ethernet in station layer and process layer is studied thoroughly by simulation. In the end, a embedded Ethernet network communication platform which be based on TMS320F2812 DSP andμC/OS-II is designed, the implementation of the Ethernet interface is expatiated on, and the embedded TCP/IP protocol is reasonably designed on the transplantation of embedded OS, then tests the feasibility of network communication by experiment.