Coordinate Transformation-Free Observer-based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

Hafiz Ahmed, Mominul Ahsan, Mohamed Benbouzid, Alhussein Albarbar, Mohammad Shahjalal, Samet Biricik

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    4 Citations (Scopus)
    21 Downloads (Pure)


    This paper studies the phase and frequency estimation problem of single-phase grid voltage signal in the presence of DC offset and harmonics. For this purpose, a novel parameterized linear model of the grid voltage signal is considered where the unknown frequency of the grid is considered as the parameter. Based on the developed model, a linear observer (Luenberger type) is proposed. Then using Lyapunov stability theory, an estimator of the unknown grid frequency is developed. In order to deal with the grid harmonics, multiple parallel observers are then proposed. The proposed technique is inspired by other Luenberger observers already proposed in the literature. Those techniques use coordinate transformation that requires real-time matrix inverse calculation. The proposed technique avoids real-time matrix inversion by using a novel state-space model of the grid voltage signal. In comparison to similar other techniques available in the literature, no coordinate transformation is required. This significantly reduces the computational complexity w.r.t. similar other techniques. Comparative experimental results are provided with respect to two other recently proposed nonlinear techniques to show the dynamic performance improvement. Experimental results demonstrate the suitability of the proposed technique.
    Original languageEnglish
    Article number9072128
    Pages (from-to)74280 - 74290
    Number of pages11
    JournalIEEE Access
    Publication statusPublished - 20 Apr 2020

    Bibliographical note

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    • Frequency estimation
    • adaptive estimation
    • harmonic distortion
    • nonlinear systems
    • observers
    • phase estimation
    • power system measurements
    • state estimation

    ASJC Scopus subject areas

    • Computer Science(all)
    • Materials Science(all)
    • Engineering(all)


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