电力系统输电线路故障测距研究方法.doc

电力系统输电线路故障测距方法研究 摘要：本文首先全面地介绍了故障测距在国内外发展历程和研究现状。根据各测距算法采用的原理不同，将现有的各种测距算法分为行波法、阻抗法、故障分析法以及智能法，然后逐类对各种算法的理论基础和应用条件上进行了分析、对比和讨论，并在此基础上总结得出了各测距算法的优点及存在的问题，指出了每种测距算法的适用范围和应用局限性。 其次设计了一套高压输电线路新型故障测距装置，该测距装置采用专门设计 的高速采样单元捕获暂态电流行波信号，采用全球定位系统GPS为线路两端提供精度高达的统一时标,从而可实现高精度的双端行波法测距。 为了验证本论文提出的故障定位方法的可行性，通过分析研究，其结果说 明本系统的实验方案确实可行。理论和仿真结果表明，本文所作的工作提高了行波故障测距在不同线路结果情况下的适应性、精度和可靠性。 关键词：输电线路；故障测距；电力系统；行波；全球定位系统(GPS) Research about the measure of fault location in power system transmission line Abstract：The development and general situation of the research in this field in China and in other countries is introduced in this paper. All the existing algorithms can be classified into 4 main methods those are traveling wave location, impedance location, fault analysis location and Intelligence location .Then the principle and application condition of each algorithm are presented and discussed. Based on the analysis and comparison of each algorithm, the corresponding merits and application limitation are concluded. In this article, a new design scheme of the fault locator for HV transmission lines is presented. By using high-speed data acquisitioning unit designed specially to capture traveling waves of transient current, using Global Positioning System (GPS) to supply high precise time tagging for both ends and using wavelet transform theories to identify the head of the traveling waves, the fault locator can realize high precise double-ended traveling waves location. At the same time, using two-terminal voltages and currents sampled by the medium-speed sampling and processing unit synchronized by the Pulse Per Second (1PPS) of GPS, can realize accurate double ended steady state location. In order to verifying the feasibility of the fault location method, which is presented in this thesis, the experiment is performed based on the locale condition. The result shows that the experimental scheme of this thesis is feasible. The analysis and simulation results in