Title :
A digital recursive measurement scheme for online tracking of power system harmonics
Author :
Girgis, Adly A. ; Chang, W. Bin ; Makram, Elham B.
Author_Institution :
Dept. of Electr. & Comput. Eng., Clemson Univ., SC, USA
fDate :
7/1/1991 12:00:00 AM
Abstract :
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
Keywords :
electric current measurement; fast Fourier transforms; frequency-domain analysis; power systems; voltage measurement; Kalman filtering theory; current waveforms; digital recursive measurement scheme; discrete Fourier transform; fast Fourier transform; frequency domain techniques; online tracking; power system harmonics; time-varying amplitudes; voltage waveforms; Current measurement; Discrete Fourier transforms; Frequency domain analysis; Frequency measurement; Kalman filters; Power harmonic filters; Power measurement; Power system harmonics; Power system measurements; Voltage;
Journal_Title :
Power Delivery, IEEE Transactions on