输电线路故障测距研究+文献综述
毕业论文设计说明书（论文）外文摘要
Title The Study of Transmission Line Fault Location
Abstract
The study of transmission line fault location is of great significance to restore power quickly and ensure the stability of the power system.Based on the traditional traveling wave fault location theory，a new method that is not affected by wave velocity to improve the reliability and precision of location is deduced.The wavelet transform is applied to the extraction of the fault traveling wave signal，to the selection of fault line and fault phase.The Empirical Mode Decomposition is applied to traveling wave de-noising.Finally，uniform Parameters line models and hybrid transmission line models are constructed with Matlab/Simulink.The fault data are collected and calculated on a variety of short-circuit fault simulation.
The algorithm that is not affected by wave velocity for uniform Parameters line is verified valid to improve the precision of the fault location.The wave velocity normalization algorithm for hybrid transmission line is verified valid,meanwhile verify the effect of de-noising.
Keywords: transmission line fault location traveling wave wavelet transform empirical mode decomposition
目 次
1 绪论 1
1.1 输电线路故障测距的意义 1
1.2 故障测距理论的研究现状 1
1.3 暂态行波的处理方法 1
1.4 本文的主要工作 2
2 输电线路行波测距理论 3
2.1 行波在输电线路上的传播 3
2.2 行波的相模变换 4
2.3 行波故障测距法 6
2.4 两种反射波的识别 9
2.5 本章小结 10
3 暂态信号的处理方法研究 11
3.1 信号的多分辨率分析 11
3.2 利用小波变换提取行波中故障信息的方法 11
3.3 基于小波分析的故障选线与选相原理 12
3.4 基于经验模态分解的行波去噪 15
3.5 本章小结 16
4 仿真算例 17
4.1 参数均匀线路的仿真算例 17
4.2 电缆-架空线混合线路仿真算例 25
4.3 本章小结 30
结 论 31
致 谢 32
参考文献33
附 录 35
1 绪论
1.1 输电线路故障测距的意义
作为电力系统的重要组成元件，输电线路发生故障时，有可能造成局部或大面积停电事故，更严重的还有可能影响到电力系统的稳定性[1]。快速而准确的故障定位能够减轻相关工作人员的巡线负担，及时的修复故障，避免瞬时故障向永久性故障的转化，不但可以减小经济损失，而且对保障电力系统的稳定性有很大帮助。