采用差分滤波算法改进最大投影差值故障选线

A new fault line selection method of the maximizing shadow difference optimized by differential filter algorithm

为了提高最大投影差值(△(Isinφ))方法在故障选线中的可靠性和运算速度,在分析了最大投影差值方法和差分滤波算法的原理后,提出了采用差分滤波算法改进最大投影差值进行故障选线的新方法。利用差分滤波算法对最大投影差值方法进行优化,优化后算法避免了引入中间参考正弦信号并减少了乘法运算量,可靠性和运算速度都得到了提高。理论分析和大量仿真结果表明,新算法不受故障角、过渡电阻、故障位置和电弧接地等参数的影响,故障选线正确率能达到100%。

In order to improve the reliability and calculating speed of the maximizing shadow difference（△（Isinφ）） method in fault line selection, the principles of the maximizing shadow difference method and the differential filter algorithm are analyzed in detail, and a new fault line selection method of the maximizing shadow difference optimized by differential filter algorithm is proposed. The maximizing shadow difference method is optimized by differential filter algorithm. The optimized method avoids the intermediate referenced sine signal and reduces the multiplication calculation, which improves both the reliability and calculating speed. Theoretical analysis and simulation results show that the new method is immune to the parameters, such as the fault angle, transition resistance, fault distance, fault arc, and so on. The fault line selection accuracy rate can reach to 100%.