电力系统暂态保护中小波基的选择与应用  

Selection and Application of Mother Wavelet in the Electric Power System Transient Protection

作　　者：杨淑英[1] 王丽宏[1] 杜荣华[1] 苏涛 

机构地区：[1]华北电力大学电气工程学院,保定071003 [2]石家庄宏安中瑞电力设备有限公司,石家庄050021

出　　处：《电力系统及其自动化学报》2008年第5期106-111,共6页Proceedings of the CSU-EPSA

摘　　要：电力暂态信号的识别、处理和利用是新一代继电保护,(暂态保护)技术发展的基础。小波变换在时域和频域内均有局部化能力,是电力暂态信号分析的强有力工具。文中研究和描述小波分析理论,探讨了小波基的特性,为电力系统常见暂态信号分析的小波基选择提供了依据。利用Matlab对一条500kV输电线路进行发生单相接地时故障定位仿真以及重合闸误动仿真,并利用小波分析中的模极大值和多尺度方法分析了仿真结果,结果证明了该选择的正确性。The identification, processing and utilization of power system transient signals are foundation of a new protection theory transient protection. Wavelet transform has location-resolve ability in time and frequency domain. It is a powerful tool in processing the electric power system transient signals. The wavelet analysis theory and the characteritic of mother wavelets are discussed. The basis of selecting mother wavelet in analysis of transient signals common in power system is provided. Simulation is done on fault location of single-phase grounding fault and maloperation on reclosure of switchgear in a 500 kV transmission line. Simulation results are analysed by using the modulus of wavelet transform and multi-resolution-analysis, which proved the proposed method.

关 键 词：小波变换 小波基 暂态保护 奇异性 多尺度分析 

分 类 号：TM711[电气工程—电力系统及自动化]