基于小波分析的相差高频保护故障识别  

The fault recognition of phase differential HF protection using wavelet analysis

作　　者：周建萍[1,2] 郑应平[2] 王志萍[1] 

机构地区：[1]上海电力学院电力与自动化工程学院,上海200090 [2]同济大学电子与信息工程学院,200092

出　　处：《微计算机信息》2008年第31期196-197,184,共3页Control & Automation

基　　金：上海市重点学科建设项目(P1301);国家自然科学基金(60674076);上海市教委优青后备基金(Z2006-78)

摘　　要：输电线路继电保护中的高频保护故障信号在传输过程中存在延时与衰耗,导致信号偏移及能量损耗;另外故障发生点的不同,使得故障电流产生相位差。小波变换所具有的时频局部化特性非常适合对复杂信号进行多分辨率分析以及奇异点检测。利用db小波对相差高频保护中的故障电流进行分解并以此识别内部、外部故障。通过Matlab进行实例仿真,仿真结果证明了该方法的可行性和有效性。In HF （High-Frequency） protection of transmission line relay protection, fault signal will be delayed and attenuated in the transmission process, which will lead to signal excursion and energy consumption. Furthermore, fault current will have phase differen- tial because faults occur at different palaces. With the characteristic of time-frequency location, Wavelet transform is very suitable for complex signal to make multi-resolution analysis and singularity detection. Db Wavelet is used to decompose the fault current of phase differential HF protection and then recognize the interior and exterior fault. Simulation is made through Matlab and the Simulation results show the method is feasible and effective.

关 键 词：相差高频保护 小波分析 继电保护 故障识别 

分 类 号：TP183[自动化与计算机技术—控制理论与控制工程]