基于故障暂态量时频联合分析的高压输电线路保护与故障定位方法研究

项目名称： 基于故障暂态量时频联合分析的高压输电线路保护与故障定位方法研究

项目编号： No.51307145

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 电工技术

项目作者： 林圣

作者单位： 西南交通大学

项目金额： 24万元

中文摘要： 超高速、高可靠的继电保护和精确可靠的故障定位是高压电网暂态稳定的重要保障与智能化的重要前提。传统保护难以实现超高速动作，故障暂态量的利用可望解决保护速动性与可靠性之间的矛盾，提高故障定位精度。现有基于暂态量的方法仅单一利用了时域或频域信息，存在行波波头提取与识别困难、频率混叠等问题，本课题首次同时从时域和频域两个角度考察故障暂态量在输电线路上的传播、分布特性，通过有效的时频联合分析方法，进行基于多频带特征融合的方向元件算法研究，解决波头难以提取与识别的问题；对不同系统阻抗下线路两端固有频率的特征进行研究，解决复杂母线下因频率混叠而导致的固有频率难以提取与识别的问题；同时，结合时频信息相互修正与时频相关分析方法，获取准确的行波传播时差及波速，建立基于时频联合分析的故障定位体系。课题旨在探讨发展利用故障暂态量的超高速保护与故障定位新原理，以提高高压输电线路暂态保护的可靠性和故障定位的准确性。

中文关键词： 时频联合分析；暂态保护；故障定位；超高速保护；高压输电线路

英文摘要： Ultra-high-speed and reliable relaying and accurate fault location of high voltage power network are important guarantees of transient stability and premises of intellectualization. Traditional relaying can hardly realize ultra-high-speed relaying, however, fault transient signals may solve the contradiction of relaying speed and reliability and increase fault location accuracy. The existing methods based on transient signals just make use of time domain or frequency domain information, with problems such as extraction and identification difficulties of traveling wave front and frequency aliasing. Transmission and distribution properties of fault transient signals along transmission lines from both the time domain and frequency domain sides simultaneously is firstly proposed in this project. The research of directional elements based on fusion of multiple frequency bands, which solve the extraction and identification difficulties of traveling wave front, is carried out using effective time-frequency analyzing methods. The research of features of natural frequencies at both ends of lines under different system impedances is made to solve extraction and identification difficulties of natural frequencies caused by frequency aliasing under complicated bus structures. Meanwhile, combined with methods of time-frequenc

英文关键词： time-frequency joint analysis；transient protection；fault location；ultra high speed protection；high voltage transmission line