Real-Time Wavelet-Based Grid Impedance Estimation Method

This letter presents a novel method to estimate the grid impedance based on stationary discrete wavelet packet transform (SDWPT). The proposed method uses a steady-state technique, by injecting an interharmonic current into the grid and measuring the voltage response at the point of common coupling...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2019-10, Vol.66 (10), p.8263-8265
Main Authors: Alves, Denis Keuton, Ribeiro, Ricardo L. A., Costa, Flavio Bezerra, Rocha, Thiago Oliveira Alves
Format: Article
Language:English
Subjects:
Continuous wavelet transform
Continuous wavelet transforms
Discrete Fourier transforms
Discrete wavelet transforms
Estimation
Fourier transforms
Grid impedance estimation
Impedance
photovoltaic (PV) grid-tied inverters
Real time
Real-time systems
Resistance
stationary discrete wavelet packet transform (SDWPT)
Wavelet transforms
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Summary:This letter presents a novel method to estimate the grid impedance based on stationary discrete wavelet packet transform (SDWPT). The proposed method uses a steady-state technique, by injecting an interharmonic current into the grid and measuring the voltage response at the point of common coupling to estimate the grid impedance. The proposed method employed a standard three-phase photovoltaic system interconnected to the grid to validate its effectiveness experimentally. Comparisons with a discrete Fourier transform- and continuous wavelet transform-based impedance estimation approaches demonstrate the performance of proposed method. Besides, the proposed SDWPT-based impedance estimation provided accurate experimental results, which make it viable for real-time applications.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2018.2870407