数字化变电站通信网络的传输时延不确定性分析

针对数字化变电站通信网络传输时延不确定性问题尚存在争议,采用网络仿真方法,定量分析了数字化变电站通信网络的传输时延不确定性问题。探讨了引起网络传输时延不确定性的诸多因素;分析了测量、数学分析和仿真三种网络传输时延分析方法的技术特点;采用OPNET网络仿真软件,仿真分析了网络端节点的处理能力、网络流量和端节点处的流量等达到某一数值时,网络传输时延展现出的不确定性行为,并提出了基于IEEE 802.1p/Q的优先级标签、虚拟局域网,组播过滤和自适应数字滤波技术提高数字化变电站通信网络传输时延确定性的四种方案。

Study on the delay-non-determinism of communication network of digital substation

Considering that it is argued that communication network of digital substation exists delay-non-deterministic problem,this paper makes study quantitatively on the delay-non-deterministic problem based on network simulator software.Firstly,in the aspect of delay-non-determinism analysis,several factors that bring about the problem of delay-non-determinism are discussed in this paper,the technical features of the methods for network transmission delay analysis in common use are analyzed,including testing,simulating and queuing theory(analytically).Secondly,the delay-non-determinism dynamic behavior is focused on applying OPNET network simulator software when different factors are out of the certain value,such as the processing capability of the end-node,the traffic of network and end-node location.Finally,in the aspect of delay-non-determinism process,several schemes of the packet prioritization based on IEEE 802.1p,the virtual LAN based on IEEE 802.1Q,dynamic multicast filtering technique and the adapting digital filter algorithm for improving the precision of the sample measure value inside end-nodes are proposed.