智能变电站站级网络的实时仿真研究

The Real-time Simulational Research About the Station Network of Intelligent Substation

基于OPNET软件,对220kV中等规模智能变电站站级网络进行建模.利用OPNET的客户机/服务器模型来模拟站级网络通信报文的端到端传输,并且在报文不同大小和发送间隔、不同CPU利用率以及采用不同传输协议的情况下,对站级网络的实时性进行仿真研究.结果显示:随着数据包大小从64bytes递增至2 048bytes,端到端延时由0.2 ms增加到了3 ms;随着数据包发送间隔从0.02s递增至3s,端到端延时由1.2ms增加到了1.75ms;随着CPU利用率从10%递增到90%,端到端延时由0.03ms增加到0.2ms;采用UDP协议的延时比TCP协议的延时要小0.02ms左右.有效论证了影响报文传输实时性的因素,为网络设备参数有效配置提供参考.

In combination with 220 kV intelligent substation station network,models are built with OPNET software.With the client/server model of OPNET to imitate the data’s ETE transmission,the real-time simulational research on station network are in a different message size and interval,different CPU utilization and the different transmission protocol cases.Results show that,with the increase from 64 bytes to 2 048 bytes packet size,ETE delay increases from0.2 ms to 3 ms;with the packet interval increase from0.02 sto 3s,ETE delay increases from 1.2ms to 1.75ms;with the CPU utilization rate increase from 10% to 90%,ETE delay increases from 0.03 ms to 0.2ms;the ETE delay of using UDP protocol is about 0.02 ms smaller than using TCP protocol.It is proved that the effect of factors in realtime message transmission also has the vital significance in choosing proper network equipment in the practical application and configurating network parameters more effectively.