基于双端数据和算法融合的输电线路故障测距新方法

Transmission Line Fault Location Method Based on Double-ended Data and Algorithm-fusion

针对输电线路故障测距中工频法和行波法在不同情况下的缺点,本文提出了一种基于双端数据和算法融合的输电线路故障测距的新方法。首先根据故障发生的位置将输电线路划分为5个区间,利用双端数据结合双端不同步工频法进行初步测距,确定故障发生的区段,为行波法识别行波波头提供可靠性保证;然后根据工频法确定的故障区段采用不同的测距策略,利用波头到达时间与波速、线路长度之间的关系建立方程组消除波速不准的影响,同时引入比率变量表示测距结果以降低因线路长度变化造成的影响,进而提高了测距的准确性和可靠性。仿真实验表明了算法的有效性。

Considering the disadvantages of frequency method and traveling wave method, this paper presents a new transmission line fault location method based on double-ended data and algorithm-fusion. Firstly, the transmission line is divided into five intervals by the location of the fault, then frequency method can determine the fault zones using unsyn- chronized data at the two ends of line, which will guarantee the reliability for identifying the wave front of traveling wave. Secondly, a different location strategy will be applied according to the fault section, which can use the relationship among the arrival time of wave front, wave velocity and line length to establish an equation to eliminate the influence of wave speed. Moreover, the location result is replaced by ratio variable to reduce the influence of length change, which improves the accuracy and reliability. The simulation result indicates the effectiveness of the proposed method.