Estimation of the Instantaneous Periodic Parameters in the Frequency Domain

Author

Dusan Agrez

Author_Institution

Faculty of Electrical Engineering, University of Ljubljana, Trzaska 25, 1001 Ljubljana, Slovenia. Phone: +386 1 4768 220, Fax: +386 1 4768 426, E-mail: dusan.agrez@fe.uni-lj.si

fYear

2006

fDate

4/6/2016 12:00:00 AM

Firstpage

1731

Lastpage

1735

Abstract

The paper presents effective algorithms for fast measurement and estimation of the unknown changing frequency and amplitude. The method for emulating coherent sampling with changing signal parameters by the interpolation of the DFT to estimate the frequency and amplitude of the particular component is described. An analysis of errors of the DFT coefficients caused by the frequency variation shows that the errors have two systematic contributions: the bias part due to the window spectrum main lobe and the long-range contribution. They can be both reduced with the interpolation. The optimum for reducing the time of measurement to two periods of the fundamental component and simultaneously reducing the influences of the harmonic components as possible can be the estimation with the two-point interpolation and the Manning window

Keywords

"Frequency estimation","Frequency domain analysis","Amplitude estimation","Interpolation","Discrete Fourier transforms","Sampling methods","Phase estimation","Frequency measurement","Power system control","Algorithm design and analysis"

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 2006. IMTC 2006. Proceedings of the IEEE

ISSN

1091-5281

Print_ISBN

0-7803-9359-7

Type

conf

DOI

10.1109/IMTC.2006.328221

Filename

4124646