一种滤除衰减直流分量的全波傅氏改进算法研究  

A full-wave Fourier improved algorithm of filtering decaying DC component

作　　者：吴继维[1] 童晓阳[1] 廖小君[2] 郑永康[3] 黄忠胜[2] 刘涛[3] 韩花荣[2] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]国网四川省电力公司技能培训中心,四川成都610072 [3]国网四川省电力公司电力科学研究院,四川成都610072

出　　处：《电力系统保护与控制》2016年第2期9-17,共9页Power System Protection and Control

摘　　要：全波傅氏算法在提取故障电流中基波分量时受衰减直流分量的影响较大。针对此问题,提出了一种滤除衰减直流分量的全波傅氏改进算法,给出新型衰减直流分量参数估算方法的公式推导。首先利用一个周波内的采样值求出故障电流中衰减直流分量的初始幅值和衰减时间常数,用采样值减去衰减直流分量值得到修正后的采样值,再利用全波傅氏算法计算出基波分量。分别采用静态模型信号、PSCAD/EMTDC仿真信号检验了该算法的性能。仿真结果表明,所提出的算法能够有效地减少衰减直流分量的影响。与一般改进算法相比,所提算法仅需要一个周波的采样数据,计算量小,计算的基波分量准确性高。Full-wave Fourier algorithm is influenced by the decaying DC component when extracting fundamental component from the fault current. In order to solve the problem, a novel full-wave Fourier algorithm of filtering decaying DC component is proposed and the derivation of the decaying DC component parameters calculation is given. Firstly, the initial amplitude and decay time constant of the decaying DC component can be calculated with the sampling values in one cycle of the fault current, and then the corrected sample values can be got by using the sampling values minus the decaying DC component. The fundamental component can be got by the revised sampling values with full-wave Fourier improved algorithm. The static model simulation signals and PSCAD/EMTDC simulated signals are applied to test the performance of the algorithm separately. The simulation results illustrate that the proposed algorithm can effectively reduce the impact of decaying DC component. Compared with traditional algorithms, the proposed algorithm only needs one cycle of sampling data. The fundamental component is calculated accurately with a small amount of calculation.

关 键 词：衰减直流分量 参数计算 时间常数 全波傅氏算法 基波分量 

分 类 号：TM744[电气工程—电力系统及自动化]