基于LMS自适应滤波的零序电流去噪研究与实现  

Research and Implementation of Zero Sequence Current De-noising Based on LMS Adaptive Filter

作　　者：郑顾平[1] 杜向楠[1] 

机构地区：[1]华北电力大学控制与计算机工程学院,河北保定071003

出　　处：《电力科学与工程》2011年第12期27-31,共5页Electric Power Science and Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(11MG50)

摘　　要：小电流接地系统可根据线路零序电流的相量特征对故障进行判别定位,但由于配电网结构复杂,单相接地故障具有多样性,某些情况下由故障产生的零序电流会非常小,此时系统中存在的噪声和干扰信号对其影响不能忽略,如不加以滤除,可能会有较大的测量误差,导致定位方法失效。对系统正常运行状态下的噪声和干扰信号进行了定量分析,提出基于LMS自适应滤波技术的零序电流去噪方法,并利用System Generator软件对其进行了系统建模与仿真,最后提出了一种基于FPGA的零序电流硬件去噪实现方案。In the small current grounding system,according to zero-sequence current phasor characteristics can found the fault location.Because of the complex structure of distribution network,in some cases,the zero-sequence fault current is very weak,power system noises and interference signals can not be ignored.If not filtered,it may have a greater measurement error,leading positioning methods fail.This paper proposes a zero sequence current de-noising method based on LMS adaptive filter technology,and uses system generator software for modeling and simulation,finally implemented by FPGA.

关 键 词：小电流接地 零序电流去噪 LMS自适应滤波 FPGA 

分 类 号：TM726[电气工程—电力系统及自动化]