Title :
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
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);
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2006.874642
