A new frequency tracking and phasor estimation algorithm for generator protection

Author

Hart, David ; Novosel, Damir ; Hu, Yi ; Smith, Bob ; Egolf, Mike

Author_Institution

AAB-TTI, Rayleigh, NC, USA

Volume

12

Issue

3

fYear

1997

fDate

7/1/1997 12:00:00 AM

Firstpage

1064

Lastpage

1073

Abstract

Digital generator protection is a complex and difficult problem. Analog and solid state methods have been successfully applied to generator protection in the past and implementation of these functions in a digital device is a continuing trend. This paper explores a new method to implement frequency tracking and phasor estimation in a numerical relay. A new algorithm is presented which utilizes a variable window discrete Fourier transform (DFT) for frequency tracking. Use of the DFT to compute the phasor estimates at a frequency other than the assumed frequency is outlined first. Next, a new technique for tracking the frequency is outlined. The paper concludes with testing of the new algorithm

Keywords

discrete Fourier transforms; electric generators; machine protection; parameter estimation; relay protection; digital generator protection; frequency tracking algorithm; generator protection; numerical relay; phasor estimation algorithm; variable window discrete Fourier transform; Equations; Frequency estimation; Protection; Sampling methods;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.636849

Filename

636849