基于小波-形态学的串补线路超高速保护新方法  

A Novel Method of Ultra-High Speed Protection for Series Compensated Lines Based on Wavelet-Morphology

作　　者：马静[1] 王增平[1] 

机构地区：[1]电力系统保护与动态安全监控教育部重点实验室(华北电力大学),河北省保定市071003

出　　处：《电网技术》2006年第11期77-81,共5页Power System Technology

摘　　要：提出了一种串补输电线路的超高速保护新方法,利用小波作为前置滤波单元,有效检测出高频突变量的同时较好地抑制了信号中的稳态分量,数学形态学中的多分辨形态梯度可用来进行边沿检测,突出波形的暂态特征。作者将二者有机结合提取暂态信号中多个频段的谱能量,实现了区内外故障的识别。ATP仿真结果表明该方法对超高压输电线路中不同位置的各种故障均有较好的适应性,该算法的计算量较多尺度小波变换的计算量小,有利于工程实现。A new principle of ultra-high speed protection for series compensated transmission lines based on wavelet-morphology is proposed, in which the wavelet based pre-set filter can effectively detect the high frequency abrupt change component while the steady component in fault signal can be well restrained; the multi-resolution morphological gradient in mathematical morphology can be used to enhance the transient features of the waveform and perform edge detection. In order to distinguish the fault in the protected zone from that out of the protected zone the authors combine the two methods to extract the spectrum energy of multi-frequency bands in transient signal. Simulation results by ATP show that the proposed principle can well adapt to various faults occurred in different positions of UHV transmission lines. The calculation amount of the proposed method is less than that of multi-resolution wavelet transform, and this advantage is in favor of applying the proposed protection principle in practice.

关 键 词：串联补偿 暂态保护 数学形态学 多分辨形态梯度 小波 电力系统 

分 类 号：TM771[电气工程—电力系统及自动化]