Practical Considerations for Recursive DFT Implementation in Numerical Relays

Author

Darwish, Hatem A. ; Fikri, Magdy

Author_Institution

Fac. of Eng., El-Menoufia Univ., Shebin El-Kom

Volume

22

Issue

1

fYear

2007

Firstpage

42

Lastpage

49

Abstract

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

Keywords

digital signal processing chips; discrete Fourier transforms; phase estimation; power filters; recursive filters; relay protection; DSP board; digital signal processing; discrete Fourier transform; error accumulation; filter instabilities; magnitude estimation; numerical relays; phase estimation; recursive DFT methods; Digital relays; Digital signal processing; Discrete Fourier transforms; Filters; Frequency estimation; Phase estimation; Power engineering and energy; Power system protection; Power system relaying; Protective relaying; Computer relaying; digital signal processing (DSP); phasor estimation; recursive discrete Fourier transform (DFT);

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2006.874642

Filename

4039416