Multiple Nonlinear Harmonic Oscillator-Based Frequency Estimation for Distorted Grid Voltage

Hafiz Ahmed, Michael Bierhoff, Mohamed Benbouzid

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Abstract

In the presence of nonlinear loads and various disturbances, harmonics and DC bias may corrupt the grid voltage signal leading to distorted grid. Frequency estimation of distorted grid signal is a challenging issue. In this paper, multiresonant nonlinear harmonic oscillators based frequency estimation technique is reported for distorted power grid. The proposed approach has also been applied for detecting the sequences of unbalanced grid. In the proposed approach, a nonlinear harmonic oscillator is used as the proxy of the grid signal. Then using the frequency-locked loop, an adaptive approach is proposed to estimate the frequency and other parameters (sequences) in the presence of harmonics and DC component. Local stability analysis and parameter tuning are provided. Comparative experimental results are provided with two other nonlinear state of the art techniques. Experimental results demonstrated the suitability of the proposed technique.
Original languageEnglish
Pages (from-to)(In-press)
JournalIEEE Transactions on Instrumentation and Measurement
Volume(In-press)
Early online date25 Jul 2019
DOIs
Publication statusE-pub ahead of print - 25 Jul 2019

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Frequency estimation
Electric potential
Tuning

Keywords

  • Frequency estimation
  • three-phase sequence detection
  • frequency-locked loop
  • unbalanced grid voltage

Cite this

Multiple Nonlinear Harmonic Oscillator-Based Frequency Estimation for Distorted Grid Voltage. / Ahmed, Hafiz; Bierhoff, Michael; Benbouzid, Mohamed.

In: IEEE Transactions on Instrumentation and Measurement, Vol. (In-press), 25.07.2019, p. (In-press).

Research output: Contribution to journalArticle

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