应用测距函数幅相特性定位高压长线路故障位置新算法

Novel Fault Location Algorithm for High Voltage Long Transmission Line Using Amplitude and Phase Characteristics of Fault Location Function

为了克服传统测距方法存在的测距精度与测距速度此消彼长的矛盾,提出了一种基于测距函数幅相特性的高压长线路故障测距新算法。该方法在将故障位置作为已知条件看待并引入参考点与之匹配的思想基础上,构造了一个具有双曲正弦函数幅相特性的故障测距函数。根据故障测距函数相位特性迅速确定故障点所在的最小可能范围,在此范围内根据测距函数幅值特性精确定位故障点。该方法理论上不存在伪根,所需的运算量远小于传统方法所需的运算量,能有效克服传统方法存在的测距精度和测距速度之间的矛盾。仿真结果表明,该方法不受过渡电阻、故障位置和故障发生角等因素的影响,在线路参数严重不均匀情况下依然保持较高的测距精度,具有良好的鲁棒性和快速性。

A new fault location function is generated based on the concept of selecting a reference point to match the fault position. It is concluded that, the function has different phase characteristics between the reference point located at the left of the fault position and the reference point located at the right of the fault position, and there is minimum amplitude of the function when the reference point matches the fault position. Based on the amplitude and phase characteristics of the function, a novel fault location algorithm for high voltage long transmission line is proposed. The presented algorithm has less calculation burden than the traditional algorithms, and can effectively overcome the contradiction between fault location precision and fault location speed which lies in the traditional algorithms. The accuracy is independent of fault transition impedance and its property, fault type and incidence angle of the fault occurrence. The proposed method has no false root in theory. Results of EMTDC based simulation indicate that the presented method is correct and accurate.