【摘要】 在利用经验波速进行线路故障定位的方法中，由于行波的色散特性，波速随着频率的变化而变化，计算得到的故障距离存在较大误差，解决此问题需要准确提取行波的时频特性。提出了基于多重同步压缩变换(multisynchrosqueezing transform, MSST)的直流线路故障定位方法，由于MSST的多次挤压特性，其能有效提高信号的时频聚集性，对行波的时频特征提取以及对波头的识别更加精准。利用此方法得到行波到达测点的时间和频率信息，进一步得到该时刻对应的波速，并以此波速计算故障距离，降低了由波速和波头到达时刻识别不精准造成的误差。最后通过仿真并结合实际工程录波数据验证了该方法的有效性。更多还原

【Abstract】 In the method of fault location using empirical wave velocity, because of the dispersion characteristics of travelling wave, the wave velocity changes with the change of frequency, and the fault distance is obtained by calculation has a large error. To solve this problem, it is necessary to accurately extract the time-frequency characteristics of travelling wave. This paper proposes a fault location method of DC line based on multisynchrosqueezing transform(MSST). Due to the multiple extrusion characteristics of MSST, the fault location method can effectively improve the time-frequency aggregation of signals, and identify the time-frequency characteristics and wave heads of traveling waves more accurately. By using this method, the time and frequency information of the traveling wave arriving at the measuring point are obtained, and the corresponding wave velocity is further obtained, and the fault distance is calculated based on the wave velocity, which reduces the error caused by the inaccurate identification of the wave velocity and the arrival time of the wave head. Finally, the effectiveness of the proposed method is verified by simulation and actual engineering data.更多还原