An innovative decaying DC component estimation algorithm for digital relaying

Yoon Sung Cho, Chul Kyun Lee, Gilsoo Jang, Heung Jae Lee

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

We propose a new decaying dc component estimation algorithm for digital relaying. Fault currents tend to include a dc decaying component. This component decreases the accuracy and speed of the protection relay operation. The proposed algorithm can estimate and eliminate the dc decaying component from fault current signals after one cycle from the fault instant. Also, it can be applied to a conventional discrete Fourier transform to calculate phasor quantities of fault currents in a digital protection relay. In the proposed algorithm, the dc decaying magnitude and time constant are estimated exactly by integrating fault currents during one cycle. The dc decaying component is eliminated by subtracting the dc value at each sampling instant. To verify the performance of the proposed algorithm, we performed a dc component estimation test and distance protection test using PSCAD/EMTDC. The results of the PSCAD/EMTDC simulation showed that the proposed algorithm can estimate dc components exactly from fault currents and can be applied to digital protection relays for phasor extraction.

Original languageEnglish
Pages (from-to)73-78
Number of pages6
JournalIEEE Transactions on Power Delivery
Volume24
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1

Fingerprint

Electric fault currents
Relay protection
Discrete Fourier transforms
Sampling

Keywords

  • DC estimation
  • DC magnitude
  • DC time constant
  • Digital protection
  • Discrete Fourier transform (DFT)
  • Fault current

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology

Cite this

An innovative decaying DC component estimation algorithm for digital relaying. / Cho, Yoon Sung; Lee, Chul Kyun; Jang, Gilsoo; Lee, Heung Jae.

In: IEEE Transactions on Power Delivery, Vol. 24, No. 1, 01.01.2009, p. 73-78.

Research output: Contribution to journalArticle

Cho, Yoon Sung ; Lee, Chul Kyun ; Jang, Gilsoo ; Lee, Heung Jae. / An innovative decaying DC component estimation algorithm for digital relaying. In: IEEE Transactions on Power Delivery. 2009 ; Vol. 24, No. 1. pp. 73-78.
@article{b3a8ee91f36e4837b134c409ec2f0459,
title = "An innovative decaying DC component estimation algorithm for digital relaying",
abstract = "We propose a new decaying dc component estimation algorithm for digital relaying. Fault currents tend to include a dc decaying component. This component decreases the accuracy and speed of the protection relay operation. The proposed algorithm can estimate and eliminate the dc decaying component from fault current signals after one cycle from the fault instant. Also, it can be applied to a conventional discrete Fourier transform to calculate phasor quantities of fault currents in a digital protection relay. In the proposed algorithm, the dc decaying magnitude and time constant are estimated exactly by integrating fault currents during one cycle. The dc decaying component is eliminated by subtracting the dc value at each sampling instant. To verify the performance of the proposed algorithm, we performed a dc component estimation test and distance protection test using PSCAD/EMTDC. The results of the PSCAD/EMTDC simulation showed that the proposed algorithm can estimate dc components exactly from fault currents and can be applied to digital protection relays for phasor extraction.",
keywords = "DC estimation, DC magnitude, DC time constant, Digital protection, Discrete Fourier transform (DFT), Fault current",
author = "Cho, {Yoon Sung} and Lee, {Chul Kyun} and Gilsoo Jang and Lee, {Heung Jae}",
year = "2009",
month = "1",
day = "1",
doi = "10.1109/TPWRD.2008.2005682",
language = "English",
volume = "24",
pages = "73--78",
journal = "IEEE Transactions on Power Delivery",
issn = "0885-8977",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "1",

}

TY - JOUR

T1 - An innovative decaying DC component estimation algorithm for digital relaying

AU - Cho, Yoon Sung

AU - Lee, Chul Kyun

AU - Jang, Gilsoo

AU - Lee, Heung Jae

PY - 2009/1/1

Y1 - 2009/1/1

N2 - We propose a new decaying dc component estimation algorithm for digital relaying. Fault currents tend to include a dc decaying component. This component decreases the accuracy and speed of the protection relay operation. The proposed algorithm can estimate and eliminate the dc decaying component from fault current signals after one cycle from the fault instant. Also, it can be applied to a conventional discrete Fourier transform to calculate phasor quantities of fault currents in a digital protection relay. In the proposed algorithm, the dc decaying magnitude and time constant are estimated exactly by integrating fault currents during one cycle. The dc decaying component is eliminated by subtracting the dc value at each sampling instant. To verify the performance of the proposed algorithm, we performed a dc component estimation test and distance protection test using PSCAD/EMTDC. The results of the PSCAD/EMTDC simulation showed that the proposed algorithm can estimate dc components exactly from fault currents and can be applied to digital protection relays for phasor extraction.

AB - We propose a new decaying dc component estimation algorithm for digital relaying. Fault currents tend to include a dc decaying component. This component decreases the accuracy and speed of the protection relay operation. The proposed algorithm can estimate and eliminate the dc decaying component from fault current signals after one cycle from the fault instant. Also, it can be applied to a conventional discrete Fourier transform to calculate phasor quantities of fault currents in a digital protection relay. In the proposed algorithm, the dc decaying magnitude and time constant are estimated exactly by integrating fault currents during one cycle. The dc decaying component is eliminated by subtracting the dc value at each sampling instant. To verify the performance of the proposed algorithm, we performed a dc component estimation test and distance protection test using PSCAD/EMTDC. The results of the PSCAD/EMTDC simulation showed that the proposed algorithm can estimate dc components exactly from fault currents and can be applied to digital protection relays for phasor extraction.

KW - DC estimation

KW - DC magnitude

KW - DC time constant

KW - Digital protection

KW - Discrete Fourier transform (DFT)

KW - Fault current

UR - http://www.scopus.com/inward/record.url?scp=58249138275&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=58249138275&partnerID=8YFLogxK

U2 - 10.1109/TPWRD.2008.2005682

DO - 10.1109/TPWRD.2008.2005682

M3 - Article

AN - SCOPUS:58249138275

VL - 24

SP - 73

EP - 78

JO - IEEE Transactions on Power Delivery

JF - IEEE Transactions on Power Delivery

SN - 0885-8977

IS - 1

ER -