Frequency-Locked Loop Based Estimation of Single-Phase Grid Voltage Parameters

Hafiz Ahmed, Sid-Ali Amamra, Michael Bierhoff

    Research output: Contribution to journalArticlepeer-review

    58 Citations (Scopus)
    325 Downloads (Pure)


    Estimation of amplitude, instantaneous phase, and frequency of a single-phase grid voltage signal are studied in this letter. The proposed approach uses a novel circular limit cycle oscillator (CLO) coupled with a frequency-locked loop. Due to the nonlinear structure of the CLO, the proposed frequency adaptive CLO technique is robust against various perturbations faced in the practical settings, e.g., the discontinuous jump of phase, frequency, and amplitude. The global stability analysis of the CLO and local stability analysis of the frequency adaptive CLO are performed. Experimental results demonstrate the effectiveness of the proposed technique over a very recent technique proposed in the literature.

    Original languageEnglish
    Article number8485651
    Pages (from-to)8856 - 8859
    Number of pages4
    JournalIEEE Transactions on Industrial Electronics
    Issue number11
    Early online date8 Oct 2018
    Publication statusPublished - Nov 2019

    Bibliographical note

    © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.


    • Frequency estimation
    • frequency-locked loop
    • phase estimation

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Electrical and Electronic Engineering


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