Fundamental frequency sequence amplitude estimator for power and energy applications

Hafiz Ahmed, Zoheir Tir, Samet Biricik and Mohamed Benbouzid

PLOS ONE, 2022, vol. 17, issue 8, 1-20

Abstract: A grid-synchronization-based fundamental frequency positive-sequence (FFPS) and negative-sequence (FFNS) amplitudes estimation technique is proposed for unbalanced and distorted grid. In this technique, the sequence amplitudes are extracted by extracting the phase-angle of the FFPS and FFNS components. The extracted phase-angles have DC and double frequency AC components. The AC component is filtered out by using a Moving Average Filter (MAF) of appropriate window length. From the extracted phase-angle, the unknown frequency can be estimated by using a suitable controller. A frequency-fixed equidistant samples-based pre-loop filter is also applied to eliminate the effect of measurement offset. The proposed technique has a very simple structure and is easy to tune. Small-signal modeling-based stability analysis and gain tuning procedure are also provided. The proposed technique strikes a good balance between fast convergence and disturbance rejection capability. Comparative numerical simulation and experimental results with similar other techniques demonstrate the suitability and performance enhancement by the proposed technique.

Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0270851

DOI: 10.1371/journal.pone.0270851

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