一种超高压输电线路暂态电压保护算法的研究  

Transient Voltage Protection Algorithm for EHV Transmission Lines

作　　者：陈茂英[1] 杨明玉[1] 张新国[1] 胡巨[1] 

机构地区：[1]华北电力大学电力系,河北保定071003

出　　处：《电力科学与工程》2004年第3期19-22,共4页Electric Power Science and Engineering

摘　　要：提出了一种基于单端电压暂态信号小波变换的超高压输电线路单端量保护算法。通过检测单端电压暂态信号小波变换模极大值,运用最小二乘法对电压暂态信号的李氏指数进行估计,从而可以区分故障线路和非故障线路。仿真表明,故障线路和非故障线路的暂态电压李氏指数有明显区别,在各种情况下该保护算法都能可靠、准确的判别。A non-unit transient protection algorithm for EHV transmission lines based on the wavelet transform of transient voltage signals is presented. By detecting the wavelet modulus maximums of transient voltage signals of one end, which is used for least square method estimation of the Lipschitz exponent of transient voltage signals, faulty lines and non-faulty lines can be distinguished. The simulation results prove that there is obvious difference between the Lipschitz exponents of transient voltage signals of faulty lines and non-faulty lines and the alogorithm is reliable and correct.

关 键 词：单端暂态量保护 小波变换 最小二乘法 李氏指数 

分 类 号：TM771[电气工程—电力系统及自动化]