【作者】 岑佳骏；

【导师】 童晓阳；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2007， 硕士

【摘要】 随着计算机和通信技术的发展，以太网技术正被引入到变电站自动化系统，然而传统的以太网技术采用的CSMA／CD协议是一种延时非确定性的网络通信方式，且不支持优先级传输，当网络负载过大时，通信性能会大大降低。电力生产的特殊性对变电站自动化系统通信网络的传输质量提出了高可靠性和实时性要求，因此有必要对基于太网网的变电站自动化系统的实时性进行深入细致的研究。论文对IEC60870-5-103协议和IEC60870-5-104协议的规约结构、传输规则、实施过程等做了详细的阐述。分析了网络103协议的结构。指出了变电站间隔层设备采用以太网通信时，采用网络103协议是较好的选择。研究了基于以太网的变电站自动化的网络的结构、数据流、报文传输规律，分析了影响变电站自动化通信网络实时性的因素。论文通过EPOCHS仿真平台模拟了网络103协议突发性信息和周期性信息的上送过程和信息在应用层的处理过程。采用PSCAD／EMTDC和NS2一起协作同步仿真变电站内数据流的方法，仿真了与故障类型紧密相关的突发性信息。通过多次对网络仿真环境和仿真参数的转换，得到了链路平均延时、突发信息的端到端延时、网络负载等仿真结果，对影响变电站通信网络实时性因素作了定量分析。更多还原

【Abstract】 The Ethernet is used widely as the communication network of SAS with the development of computer technology and the communication network technology. However, the traditional Ethernet technology using the CSMA/CD protocols is a delay-non-deterministic network, even does not support the priority transmission. When the network loads oversizes, the communication performance reduces greatly. Therefore it is neccessary to thoroughly research the delay of the communication network of Ethernet- based SASThis paper introduces the protocol formats、the transmission rules and the application process of IEC60870-5-104 and IEC60870-5-103, analyzes the format of network-103 protocols ,and indicates that it is a better choice to use network-103 protocols when Ethernet is used in the bay layer network. Then, this paper studies the network structure, the data stream, the transimmission rules of message in the Ethernet-based SAS, obtains the factors that affecting the realtime of communication network., and simulates the sending prosses of the spontaneity message and loop messages by the EPOCHS .This thesis uses a method that synchronically simulates the traffic in a substation with the PSCAD/EMTDC simulator and the NS2 software ,and simulates the alarm messages closely related to the faults in the electric power system around substation . This thesis obtaines the results of link layer delay, message delay and network load etc., and quantitatively analyzes the factors affecting the communication network realtime transimission ability through setting different the network environment and parameters.更多还原