基于OPNET的变电站二次回路通信系统仿真研究

RESEARCH ON SUBSTATION SECONDARY CIRCUIT COMMUNICATION SYSTEM USING OPNET SIMULATOR

变电站二次回路通信从金属电缆模拟通信方式逐步转变为光电数字化通信方式。针对二次回路通信系统的设计,探讨了 Ethernet 网络技术用于过程层通信的可行性。在介绍OPNET(Optimized Network Engineering Tools)网络仿真原理的基础上,建立了变电站间隔层内的数据通信仿真模型,仿真了节点在不同数据包处理能力和不同带宽下的网络时延和数据流量,证明了 100Mb/s 带宽的 Ethernet 网络可满足实际二次回路 1ms 通信时延的要求,指出节点的通信处理能力和信道带宽是制约网络性能的重要因素。

The communication of substation secondary circuit is being transformed from metal cable analog mode to optic-electric digital mode. For the design of sencondary circuit communication system the feasibility of applying Ethernet technology to the communication of process level was researched. On the basis of describing the simulation principle of optimized network engineering tools (OPNET), the digital communication simulation model within the bay of substation was built up. The nodal time delay and data flow rate under different treatment capacity of data packet and different band width were simulated. It was proved that the Ethernet network with bandwidth of 100Mb/s could meet the actual secondary circuit's requirement of time delay less than 1ms, and it was pointed out that the conmmunication processing capability of the node and the bandwidth of the channel were the important factors restricting the network performance.