Practical Considerations for Recursive DFT Implementation in Numerical Relays

In this paper, practical considerations for recursive Discrete Fourier Transform (DFT) implementation in numerical relays are presented. The DFT filter instabilities which would produce accumulated errors are emphasized. The aspects ruling error accumulation of the estimated magnitude and phase are...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2007-01, Vol.22 (1), p.42-49
Main Authors: Darwish, H.A., Fikri, M.
Format: Article
Language:English
Subjects:
Applied sciences
Computer relaying
Connection and protection apparatus
Digital relays
Digital signal processing
digital signal processing (DSP)
Discrete Fourier transforms
Electrical engineering. Electrical power engineering
Errors
Exact sciences and technology
Filters
Fourier transforms
Frequency estimation
Instability
Mathematical models
Phase estimation
phasor estimation
Power engineering and energy
Power system protection
Power system relaying
Protective relaying
Recursive
recursive discrete Fourier transform (DFT)
Stability
Testing. Reliability. Quality control
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Summary:In this paper, practical considerations for recursive Discrete Fourier Transform (DFT) implementation in numerical relays are presented. The DFT filter instabilities which would produce accumulated errors are emphasized. The aspects ruling error accumulation of the estimated magnitude and phase are highlighted. Novel solutions directed for the elimination of error accumulation are proposed and intensively tested. Digital signal processing (DSP) board based test set-up is utilized for the experimental verification. The paper results are valuable for the protection engineers particularly those concerned with the development and implementation of numerical relays
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2006.874642