Modeling and Tuning of Circular Limit Cycle Oscillator FLL With Pre-Loop Filter

Miao Lin Pay, Hafiz Ahmed

    Research output: Contribution to journalArticlepeer-review

    40 Citations (Scopus)
    157 Downloads (Pure)

    Abstract

    Circular limit cycle oscillator-frequency-locked loop (CLO-FLL) is a recently proposed advanced nonlinear technique for the parameter estimation of grid voltage signal. It has fast convergence and can handle dc bias/offset. Nevertheless, the performance degrades in the presence of harmonics. In this letter, we propose the application of preloop filtering to enhance the robustness of the CLO-FLL in the presence of harmonics. Preloop filtering slightly increases the computational complexity. However, number of parameters to tune remain the same. The small-signal modeling, tuning, and performance comparisons of both techniques are performed in this letter.

    Original languageEnglish
    Article number8617680
    Pages (from-to)9632-9635
    Number of pages4
    JournalIEEE Transactions on Industrial Electronics
    Volume66
    Issue number12
    Early online date17 Jan 2019
    DOIs
    Publication statusPublished - 1 Dec 2019

    Bibliographical note

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    Keywords

    • Frequency estimation
    • frequency-locked loop (FLL)
    • phase-locked loop (PLL)
    • preloop filter

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Electrical and Electronic Engineering

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