基于希尔伯特-黄变换的直流线路故障测距研究

Research on DC Line Fault Location Based on Hilbert-Huang Transform

针对传统直流输电导线测距方法的测量条件高、精度差和自适应能力较差的问题,通过使用基于希尔伯特-黄变换对直流输电导线的故障行波进行分析,得到直流输电导线的故障点。对直流故障信号进行经验模态分解得到固有模态函数,然后由希尔伯特变换得到其时频图。根据变换后的信息计算得到波速度,通过双端行波故障定位得到故障距离。最后通过PSCAD进行仿真分析,验证其有效性。

To address the problems of high measurement conditions,poor accuracy and poor adaptive capability of traditional DC transmission conductor ranging methods,this paper obtains the fault points of DC transmission conductors by analyzing the fault traveling waves of DC transmission conductors using the Hilbert-Huang transform based on the Hilbert transform.First,the intrinsic mode function is obtained by empirical mode decomposition of the fault signal,and then its time-frequency map is obtained by Hilbert transform.The wave velocity is calculated from the transformed information,and thus the fault distance is obtained by double-ended traveling wave fault location.Finally,simulation analysis is performed by PACAD to prove its effectiveness.