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传统的微机继电保护系统通过设备双重化配置来提高可靠性,这种方案并没有充分利用变电站内的各种保护信息,且在一定程度上造成了投资浪费。文章以基于IEC61850标准以及电子式互感器的新型数字化变电站通信网络为基础,提出了解决保护装置失效和数字互感器失效的新型可靠性技术方案,分别是共享备用保护单元和软后备信号流切换;并依据IEC61850标准确立了两种方案的逻辑节点和逻辑结构。通过分析多播应用关联(multicast application association,MCAA)模型与双边应用关联(two party application association,TPAA)模型的优缺点,确立了逻辑节点间的关联模型,并选择面向通用对象的变电站事件(generic object oriented substation events,GOOSE)快速报文作为主要通信格式。通过OPNET网络仿真得到了两种可靠性方案的投切时间,证明了两种方案的可行性。
The traditional microcomputer relay protection system improves the reliability through dual equipment configuration. This solution does not make full use of the various protection information in the substation, and to a certain extent, it causes the waste of investment. Based on the IEC61850 standard and the new digital substation communication network of electronic transformers, this paper proposes a new type of reliability scheme to solve the failure of protective devices and the failure of digital transformers, which are the sharing of backup protection units and soft standby signal flow switching respectively. And according to IEC61850 standard established two kinds of program logic nodes and logical structure. By analyzing the advantages and disadvantages of multicast application association (MCAA) model and two party application association (TPAA) model, an association model between logical nodes is established and generic generic object-oriented substations (generic object oriented substation events, GOOSE) Fast messaging as the primary communication format. By OPNET network simulation, the switching time of two reliability schemes is obtained, and the feasibility of the two schemes is proved.