Hilbert-Huang变换在距离保护中的应用  

Application of Hilbert-Huang Transformation in Distance Protection

作　　者：张嵩[1] 张保会[1] 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《电力系统自动化》2010年第19期69-74,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50977074)~~

摘　　要：克服电力系统故障暂态信号中非整数次谐波和衰减直流分量的影响,准确提取信号的基频分量,对于距离保护装置准确判断故障位置具有重要意义。文中通过利用Hilbert-Huang变换,得出一种新的故障信号基频分量提取方法。仿真表明,该方法既克服了传统傅里叶算法易受衰减直流分量影响的缺点,又弥补了各种基于周期信号模型的傅里叶改进算法在故障信号中存在非整数次谐波时基频分量提取准确度下降的不足,能够有效提高距离保护的测量精度。To detect a fault accurately,it is essential for the protection system to filter inter-harmonics and decaying DC components and extract the fundamental frequency component precisely. By using Hilbert-Huang transformation,a novel fault signal fundamental frequency component extraction method is proposed. Simulation shows that the new method can overcome the shortcomings of traditional Fourier algorithms,which are vulnerable to the impact of decaying DC component; it can also avoid the decrease of the fundamental frequency component extraction accuracy of various Fourier algorithms in the presence of inter-harmonics,which are based on the periodic signal model. Furthermore,the method effectively improves the measurement accuracy of distance protection.

关 键 词：距离保护 HILBERT-HUANG变换 经验模式分解 Hilbert谱分析 固有模态函数 

分 类 号：TM773[电气工程—电力系统及自动化]