直流接地极线路单端行波故障测距算法

Algorithm of Fault Location by Single Ended Traveling Wave on HVDC Grounding Electrode Line

相关函数法是单端行波测距中的经典算法,然而由于故障距离未知,时窗宽度难以确定,宽时窗时,相关函数极值点容易偏移,测距精度较低;窄时窗时,受噪声和波形畸变的影响较大,容易误判。在分析接地极线路的故障暂态行波的特性基础上,提出了基于多分辨相关函数理论的直流接地极线路单端行波故障测距算法。在该算法中,时窗宽度采用2进递减方式,第1层宽时窗作为参考窗口,逐级递减,充分利用宽窄时窗各自的优点,提高测距的可靠性和准确性。通过对接地极线路仿真故障数据的处理,证明该算法能同时保证测距的可靠性和准确性,具有很高的实用价值。

Correlation function method is the classical algorithm, however, due to the fault distance is unknown, window width is difficult to determine, when wide window, correlation function extreme value point easily offset, ranging accuracy is lower; when narrow window, is strongly influenced by noise and waveform distortion, easy to miscalculation. Based on the analysis of grounding fault characteristics of transient traveling wave, direct current grounding line single-ended travelling wave fault location algorithm based on multi-resolution theory of correlation function is pro- posed. In this algorithm, the time window width used 2 into decline, level 1 as a reference window of time window wide, step by step, make full use of window width when their respective advantages, improve the reliability and accuracy of distance measurement. By connecting the ends of the earth fault line simulation data processing, show that this algorithm can guarantee the reliability and accuracy of ranging , at the same time, has the very high practical value.