基于双端数据时频相关的输电线路故障定位方法

Novel Transmission Line Fault Location Method Based on Time-frequency Correlation of Two Terminal Data

在实际工程中,输电线路长度误差、授时误差、站内线缆等因素会影响输电线路行波故障定位的精度及可靠性。对此,提出基于两端数据时频相关性的故障定位方法,利用两端反射波的对称性及波形相似性,而谐振、相邻线路反射波等干扰量互不相关的特点,通过两端时频相关性分析抑制谐振及干扰影响,解决反射波识别可靠性问题,提高定位的可靠性及精度。通过仿真及现场数据对故障定位方法的有效性进行验证。

The transmission line length error,timing error,station cable and other factors affect the accuracy and reliability of transmission line traveling wave fault location in project.In view of the above problems,a fault location method based on the time-frequency correlation of data at both ends is proposed in paper,which takes advantage of the symmetry and waveform similarity of reflected waves at both ends,and the characteristics that the interference quantities such as resonance and reflected waves of adjacent lines are not related to each other.Through the time-frequency correlation analysis at both ends,the influence of resonance and interference is suppressed,the reliability of reflected wave identification is solved,and the reliability and accuracy of location are improved.In this paper,the effectiveness of the method is verified by simulation and field data.