A Magnetic-Sensing-Based Wide-Bandwidth Grid Impedance Measurement Technique with Small Perturbation Injection

Document Type

Article

Publication Date

2-1-2022

Abstract

Grid impedance is an important parameter in the impedance-based stability analysis method for analyzing the interaction between the power electronic inverters and the power grid. However, the existing measurement technique is deteriorated by narrow-bandwidth sensors, large perturbation injections, and inaccurate response components extraction based on the fast Fourier transform (FFT) algorithm. To overcome these problems, a magnetic-sensing-based wide-bandwidth grid impedance measurement technique with a small perturbation injection is proposed in this article. A novel impedance extraction algorithm based on the quadrature delay estimator (QDE) is developed to overcome the spectral leakages and frequency aliasing effect of the existing FFT-based impedance extraction algorithm. The proposed grid impedance measurement technique is implemented on a digitally controlled inverter system, and its effectiveness is verified through the experimental results.

Identifier

85111023439 (Scopus)

Publication Title

IEEE Transactions on Magnetics

External Full Text Location

https://doi.org/10.1109/TMAG.2021.3098564

e-ISSN

19410069

ISSN

00189464

Issue

2

Volume

58

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