Research On Communication Redundant Network Of Intelligent Substation

With the development of the strong and smart grid, the development of the traditional conventional substation through the transition of digital substation, and gradually shift to the intelligent substation. Intelligent substation is the important support of smart grid, the communication technology is the key to realization of the substation automation system.Intelligent electronic equipment within the station and connect each other through the network,the communication network is the carrier of substation real-time information exchange is indispensable. Therefore, research of redundancy communication in intelligent of variable power plant to achieve high efficiency of substation network, reliable operation has important significance.Network fault directly affects the stability and security of the communication system,security risks caused by the substation automation system. In order to network fault bring adverse effects, IEC 62439-3 proposed parallel redundancy protocol(PRP) and high availability seamless redundant redundant ring net structure(HSR). At the same time, IEC61850-9-2 also pointed out that the PRP and HSR network redundancy protocol is especially suitable for intelligent substation process bus.This graduation thesis based on IEC 61850 intelligent substation as the research object,combined with IEC 62439 proposed redundant network of intelligent of redundant substation communication study. 6 kinds of network redundancy structure is introduced and the principle were described, and carried on the redundancy scheme to compared and analyzed. The hierarchical structure of the combined with the IEC 61850 substation and the requirements for the communication interface between the characteristics of the data, puts forward the PRP-HSR redundant network schemes.High availability seamless redundancy ring network(HSR) has advantages of zero recovery, high reliability and good economy. After familiar with HSR network structure and working principle, analyzes the HSR redundant network communication rules and data frame structure, data frame destination address indicates that the source address and a sequence number is network processing repeat frame and loop frame is the key. Based on the double HSR network connection switching node(DANH) and single connected switching nodes(SAN) connected to the redundancy box(Red Box) structural analysis, redundant control body is the realization of the network redundancy network terminal, key processing network data frame. According to the rules of the data frame of IEC 62439-3 in HSR network, this paper puts forward 3 kinds of algorithm operation.Finally, this paper carried out the simulation of the 3 algorithms. Considering the different sequence detection algorithm, the 5 kinds of experimental simulation, the definition of the rejection rate index, and the 5 kinds of schemes in the simulation of multicast and unicast case results are compared and discussed.