An improved algorithm to remove DC offsets from fault current signals

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Fault current signals that are processed by digital relays consist of dc, fundamental, and harmonic components. Filtering algorithms are necessary to eliminate the dc and harmonic components from these signals. Several algorithms have been proposed for this task which vary in their accuracy, response time, and computational burden. The conventional discrete Fourier transform (DFT) can eliminate harmonics and is commonly used to estimate the fundamental frequency phasor, but its accuracy is lower as it does not filter the dc offset. Other algorithms including variants of DFT attempt to improve the accuracy and response time. This paper proposes a technique that takes into account the exponential variation of the dc offset and more accurately determines the fundamental component. The effectiveness of this method is evaluated by simulation on a two-machine system and also compared against existing phasor measurement methods. Simulations confirm that the proposed method can more accurately estimate the fundamental component compared to the existing methods. © 2016 IEEE

    Original languageEnglish
    Article number7582524
    Pages (from-to)749-756
    Number of pages8
    JournalIEEE Transactions on Power Delivery
    Volume32
    Issue number2
    DOIs
    Publication statusPublished - 1 Apr 2017

    Fingerprint

    Electric fault currents
    Discrete Fourier transforms
    Phasor measurement units

    Cite this

    @article{477d18b48c324151a159a2266d618d2d,
    title = "An improved algorithm to remove DC offsets from fault current signals",
    abstract = "Fault current signals that are processed by digital relays consist of dc, fundamental, and harmonic components. Filtering algorithms are necessary to eliminate the dc and harmonic components from these signals. Several algorithms have been proposed for this task which vary in their accuracy, response time, and computational burden. The conventional discrete Fourier transform (DFT) can eliminate harmonics and is commonly used to estimate the fundamental frequency phasor, but its accuracy is lower as it does not filter the dc offset. Other algorithms including variants of DFT attempt to improve the accuracy and response time. This paper proposes a technique that takes into account the exponential variation of the dc offset and more accurately determines the fundamental component. The effectiveness of this method is evaluated by simulation on a two-machine system and also compared against existing phasor measurement methods. Simulations confirm that the proposed method can more accurately estimate the fundamental component compared to the existing methods. {\circledC} 2016 IEEE",
    keywords = "DC component, estimation, fundamental component",
    author = "Gopalan, {Sachit A.} and Yateendra Mishra and Victor Sreeram and Iu, {Herbert Ho Ching}",
    year = "2017",
    month = "4",
    day = "1",
    doi = "10.1109/TPWRD.2016.2615045",
    language = "English",
    volume = "32",
    pages = "749--756",
    journal = "IEEE Transactions on Power Delivery",
    issn = "0885-8977",
    publisher = "IEEE, Institute of Electrical and Electronics Engineers",
    number = "2",

    }

    An improved algorithm to remove DC offsets from fault current signals. / Gopalan, Sachit A.; Mishra, Yateendra; Sreeram, Victor; Iu, Herbert Ho Ching.

    In: IEEE Transactions on Power Delivery, Vol. 32, No. 2, 7582524, 01.04.2017, p. 749-756.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - An improved algorithm to remove DC offsets from fault current signals

    AU - Gopalan, Sachit A.

    AU - Mishra, Yateendra

    AU - Sreeram, Victor

    AU - Iu, Herbert Ho Ching

    PY - 2017/4/1

    Y1 - 2017/4/1

    N2 - Fault current signals that are processed by digital relays consist of dc, fundamental, and harmonic components. Filtering algorithms are necessary to eliminate the dc and harmonic components from these signals. Several algorithms have been proposed for this task which vary in their accuracy, response time, and computational burden. The conventional discrete Fourier transform (DFT) can eliminate harmonics and is commonly used to estimate the fundamental frequency phasor, but its accuracy is lower as it does not filter the dc offset. Other algorithms including variants of DFT attempt to improve the accuracy and response time. This paper proposes a technique that takes into account the exponential variation of the dc offset and more accurately determines the fundamental component. The effectiveness of this method is evaluated by simulation on a two-machine system and also compared against existing phasor measurement methods. Simulations confirm that the proposed method can more accurately estimate the fundamental component compared to the existing methods. © 2016 IEEE

    AB - Fault current signals that are processed by digital relays consist of dc, fundamental, and harmonic components. Filtering algorithms are necessary to eliminate the dc and harmonic components from these signals. Several algorithms have been proposed for this task which vary in their accuracy, response time, and computational burden. The conventional discrete Fourier transform (DFT) can eliminate harmonics and is commonly used to estimate the fundamental frequency phasor, but its accuracy is lower as it does not filter the dc offset. Other algorithms including variants of DFT attempt to improve the accuracy and response time. This paper proposes a technique that takes into account the exponential variation of the dc offset and more accurately determines the fundamental component. The effectiveness of this method is evaluated by simulation on a two-machine system and also compared against existing phasor measurement methods. Simulations confirm that the proposed method can more accurately estimate the fundamental component compared to the existing methods. © 2016 IEEE

    KW - DC component

    KW - estimation

    KW - fundamental component

    UR - http://www.scopus.com/inward/record.url?scp=85017575205&partnerID=8YFLogxK

    U2 - 10.1109/TPWRD.2016.2615045

    DO - 10.1109/TPWRD.2016.2615045

    M3 - Article

    VL - 32

    SP - 749

    EP - 756

    JO - IEEE Transactions on Power Delivery

    JF - IEEE Transactions on Power Delivery

    SN - 0885-8977

    IS - 2

    M1 - 7582524

    ER -