Extraction and superposition research of current harmonics in low-voltage current mutual inductor calibration loop
In order to solve the problem of serious harmonic interference caused by the reverse superposition of operating current in the online calibration of low-voltage current transformers,a harmonic extraction and reverse superposition method of current signals is proposed to reduce high-order harmonics in the current.Firstly,this method uses fast Fourier transform(FFT)to analyze and process the grid signal.Then,a high-pass filter is designed to filter out the harmonic components of the grid current.Finally,reverses the direction and superimposes it with the grid current signal to reduce the high-order harmonic components.The results show that the high-order harmonic components in the simulated signal are reduced by 99％.When the high-order harmonic components in the actual signal are small,the harmonic components are reduced by 80％.
low-voltage current mutual inductorfast Fourier transform(FFT)finite impulse response(FIR)current reverse superposition
万方数据
维普
