Title :
Leakage reduction in measurement data contaminated with 50 Hz mains and harmonic frequency components
Author :
Verbeeck, Jef ; Rolain, Yves ; Pintelon, Rik
Author_Institution :
Dept. ELEC, Vrije Univ., Brussels, Belgium
Abstract :
The presence of 50 Hz and harmonic frequency components in measurement data can cause important leakage errors in discrete Fourier transform (DFT) based signal processing due to the fact that the mains frequency is not stable. In this paper a measurement principle is presented which avoids the leakage by resampling the measurement data on a non-equidistant time grid. The grid is chosen in such a way that the varying 50 Hz frequency is exactly one spectral line after DFT of the resampled data. Simulation results are presented using a local cubic interpolator
Keywords :
discrete Fourier transforms; electric current measurement; electric impedance measurement; harmonics; interpolation; measurement errors; signal reconstruction; signal sampling; 50 Hz; DFT based signal processing; contaminated measurement data; current spectrum; data resampling; harmonic frequency components; leakage errors; leakage reduction; local cubic interpolator; mains components; nonequidistant time grid; stator impedance; synchronisation error; systematic error; useful signals reconstruction; Current measurement; Discrete Fourier transforms; Electric variables measurement; Frequency measurement; Pollution measurement; Power harmonic filters; Power measurement; Signal processing; Stators; Time measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1999. IMTC/99. Proceedings of the 16th IEEE
Conference_Location :
Venice
Print_ISBN :
0-7803-5276-9
DOI :
10.1109/IMTC.1999.777020
