Hilbert Huang变换应用于高压输电线路故障测距

为提高故障测距的精度、增强自适应性、提高对于低频信号的分辨，提出使用Hilbert Huang方法进行故障测距。将故障点的行波信号首先进行经验模态分解（EMD），再对分解得到的IMF1进行Hil-bert Huang变换得到信号瞬时频率图，进而找出频率突变点的时间进行行波波头的识别。在介绍了Hil-bert Huang变换基本概念和原理的基础上，进行仿真算例分析，处理行波参数，得出测距结果并进行误差分析，并与小波变换进行对比。实验表明，本方法有效且精度较高。

The High Voltage Transmission Line Fault Location Based on the Hilbert-Huang Transform

To improve the accuracy of fault location,enhance the adaptability,improve the resolution of low fre-quency signal,this paper proposes a method of using the Hilbert-Huang transform for fault location. The proposed approach carries on the Empirical Mode Decomposition （EMD）for the traveling wave signal of fault point firstly, and then applies Hilbert-Huang transform to the first intrinsic mode function （IMF1）to get the signal instantane-ous frequency graph and finds out the time of frequency mutation point to identify the wave front of the traveling wave. On the basis of introducing the basic concept and principle of the Hilbert-Huang transform,the simulation example and wave parameters are analyzed then the results of distance measuring are found and the error analysis is carried on and compared with wavelet transform. The experimental results show that this method is effective and has high precision.