Low-pass filtering or gain tuning free simple DC offset rejection technique for single and three-phase systems

Hafiz Ahmed, Samet Biricik, Mohamed Benbouzid

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This paper aims to address the DC offset rejection problem in grid synchronization algorithm. A simple approach to estimate the unknown grid frequency in the presence of DC offset is proposed for this purpose. Some of the existing techniques available in the literature use either low-pass filter or an additional integrator to eliminate the DC offset. Both approaches require an additional parameter to tune. However, tuning the additional parameter is not straightforward. Moreover, tuning the overall system can be complicated due to the presence of DC offset rejection part. The proposed approach does not require any additional parameter to tune. By considering the orthogonal signal instead of the DC offset as an additional state, the proposed technique can efficiently estimate the unknown frequency of the grid. Application to both single and three-phase grids are provided. Comparative experimental results with DC offset rejection capable second-order generalized integrator (SOGI) phase-locked loop (PLL) (SOGI-PLL) demonstrate the effectiveness and suitability of the proposed technique.
Original languageEnglish
Article number106422
JournalElectric Power Systems Research
Early online date30 May 2020
Publication statusPublished - Sep 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

Copyright 2020 Elsevier B.V., All rights reserved.


  • DC offset
  • Frequency estimation
  • Phase estimation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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