Frequency Adaptive Parameter Estimation of Unbalanced and Distorted Power Grid

Hafiz Ahmed, Mohamed Benbouzid, Mominul Ahsan, Alhussein Albarbar, Mohammad Shahjalal

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Abstract

Grid synchronization plays an important role in the grid integration of renewable energy sources. To achieve grid synchronization, accurate information of the grid voltage signal parameters are needed. Motivated by this important practical application, this paper proposes a state observer-based approach for the parameter estimation of unbalanced three-phase grid voltage signal. The proposed technique can extract the frequency of the distorted grid voltage signal and is able to quantify the grid unbalances. First, a dynamical model of the grid voltage signal is developed considering the disturbances. In the model, frequency of the grid is considered as a constant and/or slowly-varying but unknown quantity. Based on the developed dynamical model, a state observer is proposed. Then using Lyapunov function-based approach, a frequency adaptation law is proposed. The chosen frequency adaptation law guarantees the global convergence of the estimation error dynamics and as a consequence, ensures the global asymptotic convergence of the estimated parameters in the fundamental frequency case. Gain tuning of the proposed state observer is very simple and can be done using Matlab commands. Some guidelines are also provided in this regard. Matlab/Simulink based numerical simulation results and dSPACE 1104 board-based experimental results are provided. Test results demonstrate the superiority and effectiveness of the proposed approach over another state-of-the art technique.
Original languageEnglish
Pages (from-to)8512 - 8519
Number of pages8
JournalIEEE Access
Volume8
Early online date6 Jan 2020
DOIs
Publication statusE-pub ahead of print - 6 Jan 2020

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Parameter estimation
Electric potential
Synchronization
Lyapunov functions
Error analysis
Tuning
Computer simulation

Bibliographical note

This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/.

Keywords

  • Unbalance Estimation
  • Frequency Estimation
  • Phase Estimation
  • Adaptive Estimation

Cite this

Frequency Adaptive Parameter Estimation of Unbalanced and Distorted Power Grid. / Ahmed, Hafiz; Benbouzid, Mohamed; Ahsan, Mominul; Albarbar, Alhussein; Shahjalal, Mohammad.

In: IEEE Access, Vol. 8, 06.01.2020, p. 8512 - 8519.

Research output: Contribution to journalArticle

Ahmed, Hafiz ; Benbouzid, Mohamed ; Ahsan, Mominul ; Albarbar, Alhussein ; Shahjalal, Mohammad. / Frequency Adaptive Parameter Estimation of Unbalanced and Distorted Power Grid. In: IEEE Access. 2020 ; Vol. 8. pp. 8512 - 8519.
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