傅氏算法在失灵保护中的改进研究

故障信号中的衰减直流分量对断路器失灵保护动作的影响很大,需要完全滤除掉此分量;针对传统全波傅氏算法消除采样信号中衰减直流分量存在的问题,进行计算误差分析;假定在输入信号只含有基频分量、衰减直流分量和各整次谐波分量时,提出一种改进的全波傅里叶算法;对传统傅氏算法和改进算法分别进行仿真,仿真结果验证改进算法能够完全滤除衰减直流分量。

Improvement research on Fourier algorithm in the failure protection

The decaying DC components in failure signal greatly influence the failure protection ofcircuit breaker which needs to filter out the components. Aiming at the problem of traditional full waveFourier algorithm eliminating the decaying DC components in sampling signals, makes calculationerror analysis. Assuming that the input signals only contain fundamental components, decaying DCcomponents and integer harmonic components, proposes an improved full wave Fourier algorithm,simulates the traditional Fourier algorithm and improved Fourier algorithm separately. The simulationresults verify the improved algorithm can completely filter out decaying DC components.