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Research on Wide Area Backup Protection Based on Centralized Decision-making

Author: JiangRongZhou
Tutor: ZhangZhe
School: Huazhong University of Science and Technology
Course: Proceedings of the
Keywords: Wide-area backup protection Regional centralized Protection Zoning Reliability Information Fusion
CLC: TM774
Type: Master's thesis
Year: 2011
Downloads: 54
Quote: 0
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Abstract


The relay is a key element to ensure the safety of electrical equipment running, but also the entire power grid security system \With the rapid development of the power system, power operators continuously push forward the market-oriented grid structure and operating environment is increasingly complex network security and stability issues have become increasingly prominent. Large power outages in recent years show that the malfunction protection, refuse to move, and the load transfer process induced protection chain action, eventually leading to the accident and even one of the key factors triggered a large area blackout. Traditional backup protection is to place the protection of information, it is protected by multi-stage action time limit, the action setting and sensitivity complement each other to achieve With increasing grid scale, the increasing complexity of network topology, tuning to the back-up protection, setting with causing great difficulties, unexpected failure occurs, may result in the backup protection mistaken or refuse to move. In recent years, with the development of communication technology, intelligent measurement and control technology and digital substation technology to break the limitations of the traditional protection systems use local information constitutes protection system, study the use of wide-area information backup protection system is more and more scholars attention. In this paper, based on the analysis and comparison of the structural model of wide-area backup protection to regional centralized structure as a the WAN backup protection structure of this study. On this basis, focusing on the structure, partitions, and based on information fusion technology failed component identification algorithm analysis system. This paper first reviewed the research status of the wide-area backup protection, analysis of the shortcomings of the existing wide-area backup protection algorithm, which in turn leads to the introduction of the idea of ??information fusion technology in wide-area backup protection, the development of information fusion technology and applications status quo. Structural model in the analysis of the existing wide-area backup protection system from communication, reliability, and can be realized in three aspects compared IED distributed substation centralized, the advantages and disadvantages of the three regional centralized structure model. The research results show that, the regional centralized structure communication simpler, more mature, has good prospects for the application. Reasonable protection partition the regional centralized protection system needs to focus on solving the problem, the paper introduces the technology of graph theory, a regional centralized structure of the wide-area backup protection system partition. Partition: the protection of the choice of the size of the region and the central station. Raised as to the degree of a node the the system master selection criteria, as well as protected partition is determined based on the processing power of each local station weight set and regional decision-making master. By case analysis to verify the feasibility of the principles and methods of protection partition. Papers on the WAN direction longitudinal to protect the reliability of the algorithm has been studied, analyzed under the direction information is missing or incorrect, the algorithm's ability to correctly identify the faulty components. The paper proposed the concept of the extended area, the deletion and obvious error information case, by the method of the extended area of ??the failure is determined within a range, and the introduction of the bus differential protection criterion negative busbar fault in the direction information. Study analysis showed that a the WAN direction the longitudinal protection when used alone, can not overcome the lack of direction information or error brought serious consequences, in some cases will result in a miscarriage of justice, and reliability to be further improved. To improve the fault tolerance of the faulty components identification algorithm based on fault direction matrix multi-information fusion technology, and to the principle of similarity matrix is ??introduced to the identification of faulty components. Simulation results show that, through the fusion of traditional protective action information, the better inhibition of protected information is missing, the negative impact of the error on the wide-area backup protection system to improve fault tolerance protection algorithm. The last, the full text of a summary, and pointed out that the next step needs to be done.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection > Protection devices
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