基于希尔伯特——黄变换的高压直流线路行波故障定位  

Traveling-wave Fault Location for HVDC Transmission Lines Based on HHT

作　　者：陆海龙[1] 段建东[1] 刘静[1] 

机构地区：[1]西安理工大学电气系,陕西西安710048

出　　处：《陕西电力》2014年第4期45-48,56,共5页Shanxi Electric Power

基　　金：陕西省教育厅专项科研计划(2010JK747)

摘　　要：提出了基于希尔伯特-黄变换(HHT)的直流输电线路行波故障定位的方法。首先,对故障初始行波信号进行经验模态分解(EMD)得到固有模态函数(IMF),然后通过对IMF进行希尔伯特(Hilbert)变换得出其时频图,根据时频图中首个频率突变点确定出故障初始行波到达的时刻并且由其对应的瞬时频率值计算其波速度。最后,利用改进的双端行波故障定位原理计算出故障距离。在EMTDC环境下进行仿真分析,相关结果证实了所提方法的有效性。A traveling wave based fault location scheme for HVDC transnussion lines is proposed based on Hilbert-Huang transform（HHT）.Intrinsic Mode Functions（IMF） of traveling waves are extracted by Empirical Mode Decomposition（EMD）,and then Hilbert transform is applied to calculate the corresponding instantaneous frequency of highest frequency IMF component.The arrival time of traveling wave and the speed of traveling wave can be detected by the first instantaneous frequency＇s mutational point.Finally,the improved two-terminal traveling wave fault location principle is used to calculate the fault distance.Relevant simulation is performed in EMTDC,and the results verify the correctness of the method.

关 键 词：行波 故障定位 经验模态分解 瞬时频率 

分 类 号：TM726.1[电气工程—电力系统及自动化]