A Method without Stability Issue for Robust Estimation of Three-Phase Grid Frequency

Md Shamim Reza, Md Maruf Hossain, Vassilios G. Agelidis

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Abstract

The grid frequency estimation using a recursive signal or an integrator based method may suffer from a stability issue due to an accumulation or discretization error. To avoid these shortcomings and also to obtain a robust estimation of three-phase grid frequency under unbalanced and distorted conditions, this letter proposes a demodulation-based method without using recursive signal and integrator. The proposed demodulation-based approach relies on the Clarke transform and fixed transport delay-based relatively simple finite-impulse-response filters. It includes an open-loop structure, thus unconditionally stable. It also does not demand real-time evaluation of trigonometric or inverse trigonometric function. Moreover, it generates improved accuracy as compared to a frequency-locked loop and phase-looked loop.
Original languageEnglish
JournalIEEE Journal of Emerging and Selected Topics in Industrial Electronics
VolumePP
Issue number99
Number of pages5
ISSN2687-9735
DOIs
Publication statusAccepted/In press - 2021

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