数字化变电站通信网络规划与实时特性改进

数字化变电站通信网络CNDS(Communication Network of Digital Substation)与传统变电站自动化系统中的通信网络在结构、功能、性能和重要性等方面存在较大差异。在IEC 61850标准对变电站自动化系统功能分层的要求和明确数字化变电站通信网络效能目标的基础上,提出了过程层点对点/多点、过程层总线和站内统一网络3种数字化变电站通信网络组网方式;指出前2种组网方式目前较易实现,而站内统一网络将凭借信息高度共享等优势成为数字化变电站通信网络的最终形态。在分析以太网介质访问控制方法的基础上,针对标准以太网存在延时不确定的问题,提出了改进以太网实时性能的若干措施,并从中选择出适用于数字化变电站通信网络的方法。研究了数字化变电站通信网络广播域的划分方法。

Communication network of digital substation and improvement of real- time performance

The CNDS(Communication Networks of Digital Substation) is quite different from that ofconventional substation in structure,functions,performance,essentiality and so on.To meet the require-ments of IEC 61850 for functional hierarchy,three types of CNDS network structures are proposed based on its clarified functional targets:point-to-point / multi points at process level,bus at process level and internal unique network.The first two types are easier to be realized,while the unique network in whole substation,with highly shared information,will be the final structure of CNDS.Based on the analysis of Ethernet media access control,measures to improve its real-time performance are suggested,some of which are applicable for CNDS.The partition methed for the broadcasting domain of CNDS is discussed.