Choosing The Optimum Frequency Estimator Under System Frequency Deviations In Power Systems

Year 2021, Issue: 27, 670 - 675, 30.11.2021

Kenan Gençol

https://doi.org/10.31590/ejosat.904157

Abstract

Parameter estimation in particular the frequency estimation of sinusoidal signals contaminated with noise is of great importance due to its broad applications in many fields such as communications, instrumentation, medicine and radar. In today’s power systems, frequency deviations in the nominal system frequency would cause spurious or so-called ghost frequency components in the spectrum. Those types of frequency components complicate the real-time tracking of harmonics and interharmonics present in the system. In this study, in order to minimize the side effects of system frequency deviations the performances of various frequency estimators are evaluated against varying fundamental frequency and noise conditions and the optimum estimator is chosen.

Keywords

power quality, harmonics, frequency estimation, frequency deviation

Thanks

The authors would like to thank Prof. O. Salor-Durna, Department of Electrical and Electronics Engineering, Gazi University, Ankara, Turkey for providing field data used in the experimental work.

Güç Sistemlerinde Sistem Frekans Kayması Olduğu Durumlarda En Uygun Frekans Kestirici Seçimi

Abstract

Parametre tahmini, özellikle gürültü ile kirlenmiş sinüzoidal sinyallerin frekans tahmini, iletişim, enstrümantasyon, tıp ve radar gibi birçok alandaki geniş uygulamaları nedeniyle büyük önem taşımaktadır. Günümüzün güç sistemlerinde, nominal sistem frekansındaki frekans sapmaları, spektrumda sahte veya sözde hayalet frekans bileşenlerine neden olmaktadır. Bu tür frekans bileşenleri, sistemde bulunan harmoniklerin ve araharmoniklerin gerçek zamanlı izlenmesini zorlaştırmaktadır. Bu çalışmada, sistem frekans sapmalarının yan etkilerini en aza indirmek için, çeşitli frekans kestiricilerin performansları, değişen temel frekans ve gürültü koşullarına göre değerlendirilmiş ve en uygun kestirici seçilmiştir.

Keywords

güç kalitesi, harmonikler, frekans tahmini, frekans kayması

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