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Phasor Estimation of Transient Electrical Signals Using Modified Covariance Enhanced Cleaned Characteristic Harmonic Filtering in Protection Relay.

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Title: Phasor Estimation of Transient Electrical Signals Using Modified Covariance Enhanced Cleaned Characteristic Harmonic Filtering in Protection Relay.
Authors: Alwan, Natheer1 (AUTHOR) natheeralwan@gmail.com, Papic, Veljko1 (AUTHOR)
Source: Energies (19961073). Feb2026, Vol. 19 Issue 3, p711. 28p.
Subject Terms: *Protective relays, *Signal frequency estimation, *Phasor measurement, *Signal processing, *Electric transients
Abstract: Modern protection relays require accurate and fast phasor estimation under harsh transient conditions, including a decaying DC component, harmonics, interharmonics, noise, and frequency instability. The original CCHDF (Cleaned Characteristic Harmonic Digital Filter) produced a harmonic cleaned signal using the Biunivocal Frequency Relationship of Phasors (BFRP) technique, but relied on DFT, Hanning windowing, and peak detection to identify interharmonic components. This paper replaces that spectral estimation block with the Modified Covariance Method (MCM) estimator, a high resolution autoregressive (AR) spectral estimator capable of superior frequency, magnitude, and phase estimation of non-harmonic components even with a short data window. The result is an improved filter named MCCCHDF (Modified Covariance CCHDF), preserving the original algorithmic pipeline, but achieving higher accuracy and faster convergence in the presence of closely spaced harmonics/interharmonics and noisy decaying DC conditions. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 191587190
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Phasor Estimation of Transient Electrical Signals Using Modified Covariance Enhanced Cleaned Characteristic Harmonic Filtering in Protection Relay.
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  Data: <searchLink fieldCode="AR" term="%22Alwan%2C+Natheer%22">Alwan, Natheer</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> natheeralwan@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Papic%2C+Veljko%22">Papic, Veljko</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Feb2026, Vol. 19 Issue 3, p711. 28p.
– Name: Subject
  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Protective+relays%22">Protective relays</searchLink><br />*<searchLink fieldCode="DE" term="%22Signal+frequency+estimation%22">Signal frequency estimation</searchLink><br />*<searchLink fieldCode="DE" term="%22Phasor+measurement%22">Phasor measurement</searchLink><br />*<searchLink fieldCode="DE" term="%22Signal+processing%22">Signal processing</searchLink><br />*<searchLink fieldCode="DE" term="%22Electric+transients%22">Electric transients</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Modern protection relays require accurate and fast phasor estimation under harsh transient conditions, including a decaying DC component, harmonics, interharmonics, noise, and frequency instability. The original CCHDF (Cleaned Characteristic Harmonic Digital Filter) produced a harmonic cleaned signal using the Biunivocal Frequency Relationship of Phasors (BFRP) technique, but relied on DFT, Hanning windowing, and peak detection to identify interharmonic components. This paper replaces that spectral estimation block with the Modified Covariance Method (MCM) estimator, a high resolution autoregressive (AR) spectral estimator capable of superior frequency, magnitude, and phase estimation of non-harmonic components even with a short data window. The result is an improved filter named MCCCHDF (Modified Covariance CCHDF), preserving the original algorithmic pipeline, but achieving higher accuracy and faster convergence in the presence of closely spaced harmonics/interharmonics and noisy decaying DC conditions. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=191587190
RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.3390/en19030711
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 28
        StartPage: 711
    Subjects:
      – SubjectFull: Protective relays
        Type: general
      – SubjectFull: Signal frequency estimation
        Type: general
      – SubjectFull: Phasor measurement
        Type: general
      – SubjectFull: Signal processing
        Type: general
      – SubjectFull: Electric transients
        Type: general
    Titles:
      – TitleFull: Phasor Estimation of Transient Electrical Signals Using Modified Covariance Enhanced Cleaned Characteristic Harmonic Filtering in Protection Relay.
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            NameFull: Alwan, Natheer
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            NameFull: Papic, Veljko
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 19961073
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              Value: 19
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              Value: 3
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
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