Study Of Communication Technology In Integrated Substation Automation System

With the continuous development and the increasing demand for the electric power, the requirement for the Substation Automation System is being increased. With the development of micro-electronics, computer and communication, the Substation Automation has developed rapidly. To properly select the infrastructure of Substation Automation System is of great importance to assure its system reliability, to promote its system performance and to save investment. Compared with the traditional communication mode, the Fieldbus is exoteric, convenient to install and maintain, flexible to configure and applied abroad. The application of Field Bus is a trend in the development of substation automation. In?this?article,?a?monitoring?softeware?development?and?the?communication structure have been introduced, firstly according to a?substation automation supervise and control system(JY-2000). The research about the principle and protocol of data communication among the supervise and control unit, communication regulator and protective relay units is also made in this section. Based on the multi-thread mechanism, the monitoring softeware ?implement the parallel running between the background data communication and the foreground operation that insured the real time characteristic of the system.LonWorks Field Bus is according with OSI standard. In this paper, the principles, network structure, methods of neuron node design and application are discussed in detail. The paper introduces LonTalk protocol and network variable, then designs the interface between Neuron chip and intelligent protect relay unit based special chip. According as the communication demand of Substation Automation System and the characteristic of LonWorks, the kind of common application layer protocol is proposed, using with network variable. In addition, the research about the data exchange technology and assemble method is also made in this article.