Modified DFT-Based Phasor Estimation Algorithms for Numerical Relaying Applications

In this paper, new modifications of the conventional full-cycle and half-cycle discrete Fourier transform (DFT)-based phasor estimation algorithms are proposed. The key idea is to combine two consecutive outputs of their real and imaginary part filters to eliminate the harmful effect of the decaying...

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Bibliographic Details
Published inIEEE transactions on power delivery Vol. 33; no. 3; pp. 1165 - 1173
Main Authors Silva, K. M., Nascimento, F. A. O.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Algorithms
Computer simulation
decaying dc component effect elimination
DFT-based algorithms
Discrete Fourier transforms
Estimation
Fourier transforms
Frequency estimation
Frequency response
Harmonic analysis
Phasor estimation
Phasors
Power harmonic filters
Relaying
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ISSN0885-8977
1937-4208
DOI10.1109/TPWRD.2017.2738621

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Summary:In this paper, new modifications of the conventional full-cycle and half-cycle discrete Fourier transform (DFT)-based phasor estimation algorithms are proposed. The key idea is to combine two consecutive outputs of their real and imaginary part filters to eliminate the harmful effect of the decaying dc components on phasor estimation, thereby a new strategy to estimate the exponential term is also reported. The proposed algorithms are compared with other DFT-based algorithms by using both computer-simulated and alternative transients program-generated signals. The obtained results reveal that proposed algorithms present excellent results, even taking into account multiple decaying dc components.
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ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2017.2738621