METHOD FOR REMOVING ATTENUATING DC COMPONENT FROM POWER SYSTEM FAULT SIGNAL

摘要

A method for removing the attenuating DC component from a power system fault signal, comprising the following steps: 1) acquiring a normal signal I₀ and a fault signal I₁ in a power system; 2) sampling the acquired fault signal I₁ to obtain an amplitude of the fault signal I₁ at each sampling point; 3) calculating the amplitude of the fault signal I₁ at each sampling point obtained in step 2) according to the following formula: I₂ (N) = K[2 I₁ (N) - I₁ (N-1) - I₁ (N+1)]; 4) obtaining from step 3) the signal amplitude of the fault signal I₁ at each sampling point after the attenuating DC component is removed from the fault signal I₁, and finally obtaining a signal I₂ having the attenuating DC component removed. The method provides simple steps, involves fewer calculations, and has low delay.