Abstract：A method of current single-phase fault line selection based on mathematical morphology and generalized S-transform is proposed. Mathematical morphology is a novel nonlinear filtering technique. Considering the signal characteristics of the power system, a linear structural element is selected. Not only can eliminate the burr shape noise, but also maintain the shape of the signal well. Generalized S-transform overcomes the shortcomings of the basic wavelet bases fixed in the S transform, and has a better frequency resolution. The signal was filtered by the mathematical morphological first. Then the generalized S-transform is used to analyze fault signals to get the modulus frequency matrix. Finally the energy characteristics modulus frequency matrix is analyzed to select the fault line. Simulation results show that the method could select fault line accurately under different working conditions of distribution network.
［2］马春艳,龚瑛,侯贸军.基于综合稳态分量的补偿电网故障选线［J］.电力自动化设备,2009,29(7):89-92.
［3］贾清泉.中性点补偿电网单相故障五次谐波混沌检测方法［J］.仪器仪表学报,2006,27（8）:902-906.
［4］张伟刚,张保会,胡海松. 应用小波包分析实现配电网单相接地故障选线［J］.电力系统自动化,2009,33(23):60-64.
［5］戴桂平,刘彬. 基于小波去噪和EMD的信号瞬时参数提取［J］. 计量学报,2007,28(2):158-162.
［6］张立国,杨瑾,李晶. 基于小波包和数学形态学结合的图像特征提取方法［J］.仪器仪表学报,2010,31(10):2285-2290.
［7］王建军,徐西鹏. 花岗石抛光表面的粗糙度、分形维数及其关系研究［J］. 计量学报,2007,28(2):124-128.
［8］Biswala M, Dash P K. Detection and characterization of multiple power quality distur-bances with a fast S-transform and decision tree based classifier［J］. Digital Signal Processing,2013,23(1):1071-1083.
［9］张钧,何正友,贾勇.基于S变换的故障选线新方法［J］.中国电机工程学报,2011,31(10):109-115.
［10］刘兴茂,林圣,何正友,等. 基于S变换的新型波阻抗方向继电器［J］. 中国电机工程学报,2013,33（22）:113-119.
［11］Sánchez P, Montoya F G. Genetic algorithm for S-transform optimisation in the analysis and classification of electrical signal perturbations［J］. Expert Systems with Applications,2013,40(5):6766-6777.
［12］易吉良,彭建春,谭会生. S变换在电能质量扰动分析中的应用综述［J］.电力系统保护与控制,2011,39（3）:142-147.
2016, Vol. 37 
