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A digital recursive measurement scheme for online tracking of power system harmonics

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3 Author(s)
Girgis, A.A. ; Dept. of Electr. & Comput. Eng., Clemson Univ., SC, USA ; Chang, W.B. ; Makram, E.B.

An optimal measurement scheme for tracking the harmonics in power system voltage and current waveforms is presented. The scheme does not require an integer number of samples in an integer number of cycles. It is not limited to stationary signals, but it can track harmonics with time-varying amplitudes. A review is first presented of the common frequency domain techniques for harmonics measurement. The frequency domain techniques are based on the discrete Fourier transform and the fast Fourier transform. Examples of pitfalls in the common techniques are given. The authors then introduce the concepts of the new scheme. This scheme is based on Kalman filtering theory for the optimal estimation of the parameters of time-varying harmonics. The scheme was tested on simulated and actual recorded data sets. It is concluded that the Kalman filtering algorithm is more accurate than the other techniques

Published in:

Power Delivery, IEEE Transactions on  (Volume:6 ,  Issue: 3 )

Date of Publication:

Jul 1991

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