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Wang C.,Zhejiang University | Wang H.-F.,Zhejiang University | Zhang C.,Guangdong Electrical Power Dispatch Center | Liu W.,Guangdong Electrical Power Corporation | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

Compared with the traditional substation relay protection, the structure and content of relay protection system in digital substation have changed greatly and there is no standard model and method to evaluate their reliability. Based on the analysis of the constitution of digital substation relay protection systems, the information flow is divided into three kinds, which are time synchronization flow, SV flow and GOOSE flow, and their possible topology for each kind of flow is analyzed. Then it uses the minimal path sets algorithm to calculate the connected rate of three kinds of information flow, and uses series and parallel model to calculate the overall reliability of relay protection systems. At last the paper discusses the software realization of this modeling algorithm, and the example analysis shows that this modeling method provides effective means to evaluate the reliability of different schemes of relay protection systems. Source

Zhang Z.-R.,Guangdong Electrical Power Dispatch Center | Xiao F.,Huazhong University of Science and Technology | Jiao S.-L.,Guangdong Electrical Power Dispatch Center | Dong W.-X.,Huazhong University of Science and Technology | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

There are many forms of network structures in the process of digital substation layer. It is significant to research the process layer's reliability under different network structures of relay protection system for the network structure selection of process layer and engineering application. Based on the digitized substation relay protection system structure characteristic, this paper puts forward a reliability analysis method for protection system. The protection system is divided into sampling subsystem and trip subsystem and their fault tree models are established respectively. The method comprehensively considers the equipment failure and repair process and makes use of the fault tree and Monte Carlo simulation to solve the reliability protection of system. Finally, the proposed method is used to evaluate the reliability of the protection system with different network structures. The main elements affecting the reliability of protection system are given by the analysis of the component probability importance. Source

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