多小波理论在输电线故障定位中的应用  

Application of multiwaves theory for the fault location in transmission line

作　　者：梁劲[1] 周静 

机构地区：[1]北京电力公司海淀供电公司,北京100086 [2]国网直流工程建设有限公司,北京100005

出　　处：《电力系统保护与控制》2008年第13期26-32,共7页Power System Protection and Control

摘　　要：多小波分析是基于小波理论发展起来的新理论,多小波保持了单小波所具有的良好的时域与频域的局部化特性,又克服了单小波的缺陷,多小波可同时具有光滑性、对称性、正交性、短支撑性,高阶消失矩等属性,由于多小波具有对称性,因此多小波变换具有线性相位,同时多小波具有正交性,因此多小波变换计算速度较快,能够满足继电保护的速动性,因此用多小波进行输电线的故障定位,有利于提高故障定位的精度和速度,本文进行了多小波定位的数字仿真实验,验证了多小波定位结果不受故障类型,故障点位置,过渡电阻和故障合闸角的影响,并和小波定位结果进行了对比,验证了利用多小波进行故障定位,定位精度要比用小波定位精度高。Multiwavelets analysis is the new developed theory based on the wavelets, it has the good local characteristics of time and frequency field that the wavelet has. At one time, multiwavelets combine the smooth, the symmetry, the orthogonality, short support, and the high order vanish moments together, and overcome the shortcomings of the wavelets. Multiwavelets transform has line phase because of the symmetry and calculates very fast because of the orthogonality, so the multiwavelets transform can satisfy the quick motion of relay protection, so the multiwavelets transform can locate the fault location of the transmission line quickly and accuracy, this paper shows the multiwavelets fanlt location principle and the algorithm is tested by digital simulations on three real transmission lines. The results show that the fault location can＇t be affected by the type of fault, the position of fault ,the fault resistance and fault close angle. Compared with the wavelets fault location, the accuracy of the multiwavelets fault location is higher.

关 键 词：多小波 小波 故障定位 输电线路 

分 类 号：TM755[电气工程—电力系统及自动化]