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Research On UHV Transmission Network Fault Information System

Posted on:2006-09-24Degree:DoctorType:Dissertation
Country:ChinaCandidate:H M DuanFull Text:PDF
GTID:1102360182969754Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
The disposal of transmission network fault is the key of power system operation and control, whether the disposal approach is appropriate and the command is correct; it affects power system security directly. The operation department of power system always aim to expedite the fault disposal ,reduce the power loss, as a sequence, the UHV power network fault information system (PNFIS) gets more attention, which is part of digital power system. The destination of PNFIS is to build an intelligent fault managing system, which is based on data of power network fault data. E.g. it should propose approach of fault managing by the way of intelligent reasoning, the analysis of the power network structure and fault information, those approaches of fault process are reference of dispatcher in power system. The PNFIS is composed by many devices and subsystem, which includes network technology, communication technology, hardware technology and software technology, power system operation and control technology and relay protection technology. Now, the PNFIS suffer from unperfected function, poor reliability and practicability. This paper made deep investigate into these issues, proposed the framework and standard of PNFIS, and did particular research about the implement of PNFIS. Firstly,this paper briefly reviewed the history and state art of PNFIS, then, the development and fruit of PNFIS in power system were summarized, based on this, the meaning and content of this paper were made clear. The standard framework of PNFIS was built in this paper,the fundamental component of PNFIS was presented in view of systemic analysis, the function standard of master and substation was also discussed, a integrated forming network method was presented by the comparison of two forming network method in substation. The state of fault location algorithm was summarized in this paper, considering the quasi real-time data of the both end of the transmission line can be available, and time gap exist between the two end breaker action, a novel fault location algorithm based on fault information is proposed. Large quantities of fault data are generated if a fault occurs in power system, in order to expedite the transmission of fault data, to improve the performance of fault dispose, to guarantee the real-time requirement of other real-time service, which performance should not be affected by the fault data, the fault data should be compressed. As a sequence, a compress algorithm based on wavelet and Huffman encoding is presented in this paper . A large of IED devices are contained in PFNIS, however, the application layer protocol is not standardized, it is a critical problem that realization of information share and inter-operation among IED devices, the main reason for this problem is that the self-description capability of IED device are deficient. So, the UCA2.0 and IEC61850 model were introduced based on object-oriented technology, and the modeling of IEC61850 is studied in detail, and a novel realization of IEC61850 based on UML and CORBA is presented in this paper. This paper introduced the Quos definition,model and control method of computer network communication, based on this, the classification method of substation information is proposed, and the information model of substation is built in this part, the Quos control approach of end-system and middle node is also presented. The implement of PNFIS is introduced in this paper ,the data platform and communication platform is analyzed in detail, the critical problems of these two platforms are studied, a feasible solution about this issue was presented in this part. The on-line coordination is also taken into account in this part. The main work and conclusions of this dissertation are summarizing finally, and the future research is described.
Keywords/Search Tags:fault location, fault data compression, information model, quality of service, real-time data platform, on-line coordination.
PDF Full Text Request
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