Abstract
The wide bandwidth grid impedance measurement is vital way in resonance and stability analysis of grid-tied system. However, the grid inevitably suffers from some non-ideal conditions, such as voltage unbalance, frequency deviation, harmonics, and inter-harmonics, which has not been fully considered and well handled in grid impedance measurement using pseudo-random binary sequences. To address this challenge, a three-stage interpolation-based measurement method for grid impedance measurement is presented in the letter. The proposed method adopts the cubic spline interpolation to reconstruct the sampled signal and use the Hanning window based interpolated fast Fourier transform (FFT) to remove some undesired components to deal with the spectral leakage caused by the FFT. Simulation and hard-in-the-loop experiment results are presented to demonstrate the performance of proposed method.
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