Study Of Based RTOS Substation Integrated Automation System

With the practical engineering background of the design an development of SIAS(Substation Integrated Automation System) JY200 running in the railway substation ,this thesis elucidates the analysis and design of applying RTOS (Real Time Operation System) to the JY200.The RTOS is a background software which run when an embedded system startup . The user's application programs are the tasks running on the RTOS. According to the needs of all the tasks, RTOS manage the resources, messages, tasks and abnormal event, so RTOS can manage multi-tasks and resources properly, meet the need of real-time, using RTOS in application is a necessary current. In this paper, a through analysis to Embedded RTOS is present. As the model, a free RTOS uC/OS is paid more attention and it was ported to the W77E58, a CPU used in JY200. Basing this, this thesis elucidates the analysis and design of applying RTOS to this SIAS.In the beginning of this article, the base conception ,phylogeny and characteristic of SIAS,embedded system,real time system and embedded RTOS are reviewed in brief.Then , the digital protection system of JY200 SIAS is illuminated detailedly. Firstly, taking an exemple of a typical 10kv railway substation, this article introduce the whole protect configure of the railway substation .then On the three side of hardware frame and work theory , software frame and function ,digital protection arithmetic ,this thesis explains the digital protection device. Whereafter, the communication system of JY200 SIAS is illuminated detailedly. According to communication system frame of passing SIAS, this article designs a three-layer configuration to communication system, discusser every layer's function. then states the communication stipulation and communication process of this system in detail, giving emphasis to the application of IEC870-5-103 communication stipulation . At last , discuss the application of the RS-485 locate bus in the railway power substation on its security and the method to obtain high reliability .In the last two chapters, at the base of introducing the base information of the RTOS uC/OS, narrate the measure of replanting uC/OS to 51 series singlechip , then advance the application design idea of the RTOS based protect and communication software, advances the advantage of using RTOS.