基于数学形态滤波和SAO-VMD的混合线路故障测距方法  

Hybrid Line Fault Location Method Based on Morphological Filtering and SAO-VMD

作　　者：姜锋 史明明 倪俊贤 杜嘉诚 JIANG Feng;SHI Mingming;NI Junxian;DU Jiacheng(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211167,China;State Grid Jiangsu Electric Power Research Institute,Nanjing 211103,China)

机构地区：[1]南京工程学院电力工程学院,江苏南京211167 [2]国网江苏省电力有限公司电力科学研究院,江苏南京211103

出　　处：《机械与电子》2025年第4期52-57,共6页Machinery & Electronics

摘　　要：针对配电网线缆混合线路故障行波波头幅值小、易受噪声干扰等问题,提出了一种基于数学形态滤波和雪消融优化算法(SAO)的变分模态分解(VMD)故障测距新方法。首先,利用数学形态学对故障行波信号进行降噪处理,以抑制噪声并增强故障特征;然后,通过SAO算法对VMD分解的关键参数模态分解个数K以及惩罚因子α进行优化,提取最佳故障特征模态;最后,用Teager能量算子(TEO)标定行波波头,获取行波到达时间,实现故障测距。采用PSCAD和MATLAB进行建模仿真数据处理,实验结果表明,该方法对过渡电阻和噪声有较强耐受性,有效提高了行波波头标定准确度。A new fault location method based on mathematical morphological filtering and snow ablation optimizer(SAO)-variational mode decomposition(VMD)is proposed to solve the problem that the fault traveling wave head amplitude of the cable hybrid line in the distribution network is small and susceptible to noise interference.Firstly,mathematical morphology is used to denoise the fault traveling wave signal to suppress noise and enhance fault characteristics.Then,the SAO algorithm is used to optimize the number of modal decomposition K and the penalty factorαof the key parameters of VMD decomposition,and the best fault feature mode is extracted.Finally,the Teager energy operator(TEO)is used to calibrate the traveling wave head,obtain the arrival time of the traveling wave,and realize the fault location.PSCAD and MATLAB are used for modeling simulation and data processing.The experimental results show that the method has strong tolerance to transition resistance and noise,and can effectively improve the accuracy of traveling wave head calibration.

关 键 词：混合线路 形态学 雪消融优化算法 变分模态分解 故障测距 

分 类 号：TM726[电气工程—电力系统及自动化]