摘要
输电线路发生故障后,为了从带有各种噪声的信号中提取有用的行波信号,引入了数学形态学理论这一新型的信号处理工具,用以滤除行波信号中的随机噪声和脉冲噪声,方法是对故障行波电流信号进行相模变换,求取正反向行波信号,通过小波分解提取出故障点的模极大值实现行波差动保护。并由此提出基于小波变换的行波差动保护理论。仿真实例分析表明该方法是可行的。
For the sake of signal extraction of useful travelling wave from signals with noise after the occurrence of failures, mathematical morphology, the new signal processing toolset is introduced to filter random noise and pulse noise. Phase-mode transformation is adopted on current signal of fault travelling wave, and positive travelling wave and reverse travelling wave are obtained; by wavelet decomposition, modulus maximum at the fault point is extracted to achieve differential protection. Therefore, differential protection of travelling wave based on wavelet transformation is proposed. The analysis on simulation example verifies the feasibility of the method.
出处
《广东电力》
2011年第8期47-50,共4页
Guangdong Electric Power
关键词
行波差动保护
数学形态学
小波分析
高压输电线路
differential protection of travelling wave
mathematical morphology
wavelet analysis
HV transmission line
作者简介
戚伟（1985-），男，江苏苏州人。从事继电保护及自动化方面的工作。
