Design And Implementation Of The Communication Network In The Substation Supervision System

The substation automation system is always the most important part of the electric system application. As the development of the technology, all sorts of new techniques are applied to the substation automation system constantly. Interactive Information plays an important role in the substation automation system. The original practice of the system is mainly relied on the connection among various field buses. The communication approach is mainly constituted of serial communication, like RS232 and RS485. However, as the Ethernet technology began to develop rapidly, Ethernet with its advanced network competition mechanism, mature application environment, low price and open agreement, has become the dominant role of the network in LAN application.The achievement of the substation supervision system is in accordance with the layered conceptual design supplied by IEC61850 which divides the substation communication system into three tiers (substation layer, spacing layer and process layer) in terms of logic or physical concept. Full digital communications which adopt an open, full distribution and interoperable industry control Ethernet communications are applied between the internal spacing layers of substation and substation layer.With the development of the computer hardware and software, the embedded Ethernet provides the substation supervision system with a new approach. Through the embedded software and hardware, people can connect the Ethernet in the device end which can be regarded as net node, and therefore consists of the whole structure of the Ethernet.To adapt to the new demand, this topic designs the substation supervision system which is based on the Ethernet and the data traffic is based on the TCP/IP. Since adopting this kind of technology for the network construction design which requests the substation equipment must have the embedded Ethernet interface, therefore the design of the device which has Ethernet interface becomes the foundation and guarantee of the whole system design. This topic selects W3100A the hardware TCP/IP agreement stack chips and carries through the design of the network interface by the programmed methods of SOCKET which based on TCP/IP. In order to facilitate the debugging, engineer maintaining software increases the parameter establishment module and develops the position machine Ethernet data communications test order. The entire design proposal proved to be reliable which passed through the test analysis.This paper first introduces the structure of the substation supervision system, its main function and development situation. Then it introduces the data traffic of the substation supervision system, emphasizing the important role of the communication in the system. On the basis of this, it pointes out the correspondence network design proposal which based on the embedded Ethernet and then analyzes the design and realization of the network interface in detail including the hardware design and the software design. Finally this paper introduces the realization method of the parameter establishment and the correspondence test in the data traffic.The research contents of this paper have already carried out in the substation supervision system of Fijian which is proved good and reliable by operation testing. The data communications of the system also passed the Statute analysis test made by relevant governments.