基于双端行波法的多端输电线故障测距研究

发布时间：2018-12-08 10:19

【摘要】：随着电力系统规模日益扩大,输电网络结构也愈加复杂,传统的双端行波故障测距方法将无法满足输电网络故障测距准确性和可靠性的要求。为此,论文以图论为数学基础,提出了一种基于双端行波法的多端输电线路故障测距改进算法,并通过仿真验证了该方法的可靠性和实用性。本文首先介绍了行波故障测距在国内外的发展历程和多端输电线路故障测距的研究现状。现有的基于小波变换的多端输电线路故障测距算法和基于希尔伯特-黄变换的多端输电线路故障测距算法都只能进行传统的双端行波故障测距。当其中一端行波故障测距装置出现故障时,就会造成故障测距失败。基于图论的网络故障行波测距方法构建测距网络,利用最短路径算法,将复杂的多端输电网络简化成辐射型网络,并运用数据加权融合技术对故障位置进行测距。即使在行波装置一端失信时也能获得准确的故障测距结果。但该算法在对故障测距结果进行加权融合处理时,只考虑了故障行波传输路径上变电站对测距结果的作用,忽略了相邻变电站的输电线路传输距离对故障测距精度的影响。为了提高该算法的精度和可靠性,本文对这一算法进行了改进,使算法精度更高,可靠性更强。最后,引入220kV输电网故障实例,运用Matlab建立仿真模型,并对以上三种测距方法进行仿真分析。仿真结果表明,与传统的小波变换法和HHT故障测距法相比,本文提出的改进的基于双端行波法的多端输电线路故障测距方法具有较高的测距精度和可靠性。并且不受故障类型、部分节点记录错误时间的影响,适用于多端输电线路故障测距。该研究成果将为下一步开发应用行波保护装置奠定理论和技术基础。
[Abstract]:With the increasing scale of power system and the complexity of transmission network structure, the traditional dual-terminal traveling wave fault location method will not meet the requirements of accuracy and reliability of fault location in transmission network. Therefore, based on graph theory, an improved fault location algorithm for multi-terminal transmission lines based on two-terminal traveling wave method is proposed, and the reliability and practicability of the method are verified by simulation. This paper first introduces the development of traveling wave fault location at home and abroad and the research status of multi-terminal transmission line fault location. The existing multi-terminal transmission line fault location algorithms based on wavelet transform and Hilbert-Huang transform can only carry out traditional two-terminal traveling wave fault location. When one end of the traveling wave fault location device failure, it will cause fault location failure. The fault location network is constructed based on graph theory. The complex multi-terminal transmission network is simplified into a radiative network by using the shortest path algorithm and the data weighted fusion technique is used to locate the fault location. Accurate fault location results can be obtained even when one end of the traveling wave device is discredited. However, in the weighted fusion of fault location results, the algorithm only considers the effect of substation on fault location result on the transmission path of fault traveling wave, and neglects the influence of transmission distance of transmission line of adjacent substation on fault location accuracy. In order to improve the accuracy and reliability of the algorithm, the algorithm is improved in this paper, which makes the algorithm more accurate and reliable. Finally, an example of fault in 220kV transmission network is introduced, and the simulation model is established by Matlab, and the above three fault location methods are simulated and analyzed. The simulation results show that compared with the traditional wavelet transform and HHT fault location method, the improved fault location method based on two-terminal traveling wave method has higher accuracy and reliability. And it is not affected by fault type, and some nodes record error time, so it is suitable for fault location of multi-terminal transmission line. The research results will lay a theoretical and technical foundation for the further development and application of traveling wave protection device.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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