摘要
输电线路发生故障后,采集到的信号往往带有各种噪声,有效滤除噪声对行波的干扰,提取有用的行波信号,是实现行波差动保护的关键。文中介绍了采用数学形态学滤除行波信号中的随机噪声和脉冲噪声,对故障行波电流信号进行相模变换,求取正反向行波,提取正反向行波波头信号的模极大值实现行波差动保护。在提取行波模极大值的算法中,提出了一种新的算法,使保护的速度更快,仿真研究表明该算法是可行的。
When the transmission line fault occurred,the signals contain with various noise.Efficiently filtering the noise of traveling wave and extracting the useful signal of traveling wave are key to realize traveling wave differential protection.Mathematics morphology is adopted to filter the random noise and impulse noise,then taking phase-mode transformation for traveling wave fault current signal.In the wave modulus maximum extraction algorithm,a new algorithm is proposed to faster the speed of protection. Example shows that the method is feasible.
出处
《陕西电力》
2011年第5期32-36,共5页
Shanxi Electric Power
关键词
形态滤波
数学形态学
行波差动保护
mathematics morphology
traveling wave
differential protection
