基于HF-HHT的暂态扰动信号分析  

Analysis of transient disturbance signal based on HF-HHT

作　　者：王震[1] 王斌[1] 喻敏[1] 金吉[1] 汪洋 Wang Zhen;Wang Bin;Yu Min;Jin Ji;Wang Yang(School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学信息科学与工程学院,武汉430081

出　　处：《电测与仪表》2021年第12期88-95,共8页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51877161)。

摘　　要：文中引入了一种基于高频谐波注入法的希尔伯特黄变换(HF-HHT),以此来克服经验模态分解在电力系统暂态扰动信号检测中出现的模态混叠现象。该方法通过设置注入高频信号的频率,结合HHT,对暂态扰动信号进行分析,达到了抑制模态混叠的目的。HF-HHT的关键在于高频谐波注入频率的选取,文中通过理论分析和仿真实验得出有效且普适的频率选取原则:当注入高频谐波频率在以原信号高频成分的最大频率1/2倍为中心,上下波动在基波频率1/2倍范围内时,HF-HHT普遍有效。并对实测电能质量信号进行分析,验证了该方法在电力系统暂态扰动信号检测中的有效性和普适性。A Hilbert-Huang transform based on the high-frequency harmonic injection method(HF-HHT)is introduced to overcome the modal aliasing in empirical mode decomposition in the detection of transient disturbance signals in power system.In this method,the frequency of the injected high-frequency signal is combined with HHT to analyze the transient disturbance signal,thereby achieving the purpose of suppressing modal aliasing.The key of HF-HHT is the selection of the high-frequency harmonic injection frequency.An effective and universal frequency selection principle is obtained through theoretical research and simulation experiments,which means the HF-HHT is generally effective when the injected harmonic frequency is centered at 1/2 times the maximum frequency of the high frequency component of the original signal,and the up and down fluctuations are within 1/2 times the fundamental frequency.The analysis of the measured power quality signals proves the effectiveness and universality of the method in the detection of transient disturbance signals in power system.

关 键 词：希尔伯特黄变换 模态混叠 暂态扰动 高频谐波注入法 

分 类 号：TM93[电气工程—电力电子与电力传动]