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

Hafiz Ahmed, Sid Ali Amamra, Michael Bierhoff

Research output: Contribution to journalLetterpeer-review

60 Citations (Scopus)


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 - 1 Nov 2019
Externally publishedYes


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