Hybrid Estimator-Based Harmonic Robust Grid Synchronization Technique

Hafiz Ahmed, Miao Lin Pay, Mohamed Benbouzid, Yassine Amirat, Elhoussin Elbouchikhi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
85 Downloads (Pure)


Harmonic robust grid synchronization technique has been studied in this paper. This implies the estimation of phase and frequency of single-phase grid voltage signal. Motivated by recent developments in linear harmonic oscillator based
technique, this paper first propose an adaptive observer based solution that has the potential to speed-up the dynamic performance with respect to other generalized integrator type techniques. However, this may decrease the robustness of the proposed technique in the presence of harmonics and or DC bias. To overcome this issue, a hybrid estimator is proposed. This estimator is comprised of a band-pass type pre-loop filter and the initially proposed adaptive observer.
Local stability and tuning of the adaptive observer are provided for the nominal case. In the presence of harmonics, smallsignal modeling and tuning of the hybrid estimator are provided as well. Finally, hardware-in-the-loop (HIL) comparative experimental results are provided with similar other recently proposed techniques in the literature. Experimental results demonstrate the suitability of the proposed techniques.
Original languageEnglish
Article number106013
JournalElectric Power Systems Research
Early online date5 Sep 2019
Publication statusPublished - Dec 2019

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Electric Power Systems Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Electric Power Systems Research, 177, (2019)
DOI: 10.1016/j.epsr.2019.106013

© 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/


  • Frequency estimation
  • Grid synchronization
  • Harmonic robust estimation
  • Phase estimation
  • Prefiltering

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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