基于导数法的故障行波波头识别改进算法

An Improving Derivation Algorithm to Recognize Wave Heads of Fault Generated Traveling Waves

通过大量的仿真实验,对用于故障行波波头识别的导数法提出一种改进算法。导数法通常是以差分这种绝对变化量方式来反映信号的突变,改进算法采用比值的方式来反映信号的突变,后者属于相对变化量的范畴,而相对变化量比绝对变化量更能有效地反映信号的突变本质,且不受信号自身幅度的影响。改进算法原理简单,计算量小,ATP仿真表明该方法是正确、有效的。

Based on a lot of simulation tests, the derivation method that is used to recognize wave head of fault generated traveling wave is modified, and an improved derivation algorithm is proposed. As for common derivation methods, the difference belonging to absolute variation quantity is used to reflect the abrupt change of signals, and yet in the proposed improved algorithm the abrupt change of signals is reflected by the value of ratio belonging to relative variation quantity. The essence of abruptly changed signals can be reflected more effectively by relative variation quantity than by absolute variation quantity, and relative variation quantity is not affected by its own amplitude of the signal. The principle of the improved algorithm is simple and its calculation burden is light. Simulation results by ATP show that the proposed algorithm is correct and effective.