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A new frequency tracking and phasor estimation algorithm for generator protection

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5 Author(s)
Hart, D. ; AAB-TTI, Rayleigh, NC, USA ; Novosel, D. ; Yi Hu ; Smith, B.
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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

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Power Delivery, IEEE Transactions on  (Volume:12 ,  Issue: 3 )