الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
Musaremeat of power system frequeacy ill an important task sinc:e the
frequency deviation value il a good indicator of tbe system abnormal operatiag
c:oaditions. Aeeurate meuun:ment of power ’)’Item bannonks ts essential to
eval118te the harmonic diltortioo io both curn:ot and voltage waveforms aod to
c:an desiga hanoooio nlten.
The n:seareh iB based on four tec:hnlques (Short time Fourier transform, Least
error square, Newton, and Es.tended Kalmao niter) to trac:k power system
frequency and harmonics. These technique~ are applied on (a) simulated signals
with kaown harmonics and (b) practical current aad voUag:e measurements.
The results show that the short time Fourier transform and the extended
Kalmaa niter tec:hniq11011 are more accurate and rob11st to noise than least error
square aad Newton techniques.