一种降低衰减直流分量影响的全波傅氏改进算法  

An improved full-wave Fourier algorithm for reducing influence of decaying DC component

作　　者：费殷胜男 杨向萍[1] FEI Yin-sheng-nan;YANG Xiang-ping(College of Mechanical Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学机械工程学院,上海201620

出　　处：《传感器与微系统》2018年第12期150-152,共3页Transducer and Microsystem Technologies

摘　　要：针对电力系统故障发生时电信号中产生的衰减直流分量,传统全波傅氏算法无法滤除,导致求取结果误差较大,引发不可预估的影响的问题,提出一种全波傅氏改进算法。通过采样估算出衰减时间常数及衰减直流分量的初始值,由采样值减去衰减直流分量得到修正值。对修正值进行全波傅里叶变换,即可求得基波分量。经MATLAB仿真结果表明:改进算法可以有效降低衰减直流分量的影响,在计算时避免指、对数函数。提出的算法快速简单,在保证快速性的同时增强灵敏性,适用于实际微机保护装置。Aiming at problem that traditional full-wave Fourier algorithm can't filter out decaying DC component generated in electric signal while power system fault occurs,which results in big error of resolving result,cause unpredictable effect,a full-wave Fourier improved algorithm is proposed.Estimate the decay time constant and the starting value of decaying DC component by sampling.Then the sampling values minus the decaying DC component to get the corrected value.At last,full-wave Fourier transform is carried out on the corrected value to obtain the fundamental component.The MATLAB simulation results show that the improved algorithm can effectively reduce the influence of decaying DC component.It can avoid the exponential function and logarithmic function in calculation.The algorithm is so fast,simple and it can increase the sensitivity while ensuring rapidity.It is suitable for microcomputer protection device.

关 键 词：衰减直流分量 全波傅氏算法 微机继电保护 

分 类 号：TM933[电气工程—电力电子与电力传动]