基于双数据源的直流输电线路故障测距方法

Method of DC Transmission Line Fault Location Based on Double Data Source

介绍了针对直流输电线路的双端行波法、单端行波法和时域故障分析法等故障测距方法的原理、特点及应用现状。针对实际工程应用中出现的行波测距法数据来源可靠性相对较低以及时域故障分析法故障测距精度低等问题,提出了时域故障分析法与行波法相结合的直流输电线路综合故障测距方法。利用双数据源,包括高速数据及低速数据,通过单端行波法/时域法分别计算可能故障点,并利用小波变换模极大值的幅值、极性特征筛选确定故障点,将单端行波测距法的精度优势和时域法测距数据的可靠性优势相结合。最后通过PSCAD仿真对该方法的有效性进行了验证。

This paper introduces the principle,characteristics and application status of various fault location methods for DC transmission lines,including double ended traveling wave method,single ended traveling wave method and time⁃domain fault analysis method.A comprehensive method for fault location of DC transmission line is proposed in this paper,which combines time domain fault analysis method with traveling wave method,aiming to solve the issues of relatively low reliability of data sources of the traveling wave method and low accuracy of fault location for the time domain method in the practical engineering application.Using dual data sources including high⁃speed and low⁃speed data,possible fault points are calculated using single ended traveling wave method/time⁃domain method,and fault points are determined by filtering the amplitude and polarity characteristics of wavelet transform modulus maximum.The accuracy advantage of single ended traveling wave method is combined with the reliability advantage of time⁃domain method.Through EMTDC simulation,the validity of the method is verified in this paper.