基于2阶累加生成相关性的谐振接地系统故障选线方法

发布时间：2019-01-01 18:47

【摘要】：根据电感电流与电容电流的关系,提出一种基于2阶累加生成相关性的谐振接地系统故障选线方法。单相接地故障发生后,首先,奇异值分解两周期内的原始暂态零序电流,得到一系列特征分量,并计算各特征分量与原始暂态零序电流的相关系数;然后,小波阈值算法处理相关系数大于阈值的特征分量,并重构以得到纯净的暂态零序电流;其次,为凸显数据形态和表征信号的内在发展趋势,2阶累加生成(2-AGO)方法处理各线路暂态零序电流信号获得本征趋势分量,并对其进行自然对数变换。最后,计算各线路综合相关系数,并选取最小综合相关系数对应的线路为故障线路。理论分析和仿真结果均证明了所提选线方法的准确性,可靠性和强抗噪性。
[Abstract]:According to the relationship between inductance current and capacitance current, a fault line selection method for resonant grounding system based on 2-order cumulative generation correlation is proposed. After the single-phase grounding fault occurs, the singular value decomposes the original transient zero sequence current in two periods, obtains a series of characteristic components, and calculates the correlation coefficient between each characteristic component and the original transient zero sequence current. Then the wavelet threshold algorithm processes the characteristic components whose correlation coefficient is greater than the threshold value and reconstructs to get the pure transient zero-sequence current. Secondly, in order to highlight the data morphology and the inherent development trend of the signal, the 2-order cumulative generation (2-AGO) method processes the intrinsic trend components of the transient zero-sequence current signals and carries out the natural logarithmic transformation. Finally, the integrated correlation coefficient of each line is calculated, and the line corresponding to the minimum integrated correlation coefficient is selected as the fault line. The theoretical analysis and simulation results show that the proposed method is accurate, reliable and robust to noise.
【作者单位】：中国农业大学信息与电气工程学院;
【分类号】：TM862

【相似文献】