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On-line tracking of changing harmonics in stressed power systems: application to Hydro-Quebec network

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3 Author(s)
Kamwa, I. ; Inst. de Recherche, Hydro-Quebec, Varennes, Que., Canada ; Grondin, R. ; McNabb, D.

This paper applies, to a practical test case, two schemes for determining harmonics in power systems that are not limited to stationary waveforms, but can equally estimate harmonic phasors in waveforms with time-varying amplitudes and changing fundamental frequency. The first scheme relies on the short-time Fourier analysis performed using the fast Fourier transform (FFT) with time-domain windowing and frequency-domain interpolation. Another scheme combines fundamental-frequency tracking with a Kalman filter-based harmonic analyzer, yielding a uniformly sampled, self-synchronizing harmonics tracker. The performance of these advanced measurement schemes for changing harmonics is illustrated convincingly on nonstationary waveforms generated in the EMTP using a realistic series-compensated transmission network

Published in:

Power Delivery, IEEE Transactions on  (Volume:11 ,  Issue: 4 )

Date of Publication:

Oct 1996

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