New High Precision Identification Method for Converter Impedance Based on Double-window All-phase FFT
In order to improve the impedance identification accuracy of the converter,the Blackman double-window all-phase fast Fourier transform algorithm was proposed to be applied to high-precision identification of the output impedance of the grid connected converter.Firstly,the dq impedance model of the three-phase grid connected converter in the dq coordinate system was established;secondly,based on principle analysis,it was demonstrated that the proposed method has excellent spectrum leakage suppression performance and strong noise resistance,which was particularly suitable for high-precision identification of output impedance of grid connected converters with strong nonlinear characteristics under the background of small disturbance signals.The identification process of converter impedance was also provided;finally,the superiority of the method was verified through simulation experiments.The impedance identification method based on Blackman double-window all phase fast Fourier transform can identify the output impedance of the converter with higher accuracy compared to the traditional methods.
spectral leakageimpedance identificationgrid-connected converterall-phase fast Fourier transform(FFT)small disturbance
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维普
