CAJ | 학술논문

提出了一种基于Stehfest算法的双端测距方法.该方法采用配网单相接地故障后半周期内的零序电压、电流暂态信息,由Prony算法得到其时域表达式,利用零序网络以及线路分布参数的象函数模型,在不考虑线路零序参数的频率特性和考虑其频率特性两种情况下,分别列写出线路的象函数测距方程.通过 Stehfest 算法对测距方程进行数值反演计算,并用搜索法求取区间内测距方程的最小值,得到方程的数值计算矩阵,进而以该矩阵行元素平方和最小为目标,确定故障距离.大量的EMTP-ATP仿真实验验证了该方法的正确性.
제출료일충기우Stehfest산법적쌍단측거방법.해방법채용배망단상접지고장후반주기내적령서전압、전류잠태신식,유Prony산법득도기시역표체식,이용령서망락이급선로분포삼수적상함수모형,재불고필선로령서삼수적빈솔특성화고필기빈솔특성량충정황하,분별렬사출선로적상함수측거방정.통과 Stehfest 산법대측거방정진행수치반연계산,병용수색법구취구간내측거방정적최소치,득도방정적수치계산구진,진이이해구진행원소평방화최소위목표,학정고장거리.대량적EMTP-ATP방진실험험증료해방법적정학성.
This paper proposes a new two-terminal fault location method based on Stehfest algorithm. The method uses zero-sequence transient information within first half-cycle after a single-phase ground fault occurred in the distribution network, adopts Prony algorithm to obtain time domain expression of zero-sequence transient information, combines with zero sequence network and image function of distributed parameter line, takes frequency characteristics of lines' zero sequence parameters into account and gets the image function location equation by using the fault feature. Then Stehfest algorithm is adopted to get location equation's numerical inversion and search algorithm is used to find the minimum value of function location equation and obtain the numerical matrix. Last, the method calculates square sums of matrix row elements and takes the minimum value as the target to determine the fault distance. The accuracy and effectiveness of the method has been verified by EMTP-ATP simulation experiments.