ANTIALIASING FILTERS IN POWER QUALITY DIGITAL MEASUREMENT SYSTEMS
Journal Title: Metrology and Measurement Systems - Year 2005, Vol 12, Issue 4
Abstract
Digital signal processing exists in the systems which perform the processing of power waveforms. Each measurement equipment using digital signal processing and computing its discrete spectrum should be equipped with an antialiasing filter which unfortunately creates errors in magnitude and phase spectrum responses. This paper discusses the spectrum distortion analysis of the power signals caused by antialiasing filter implementation in the analog-digital signal processing system paths. The influence of the aliasing phenomenon and a real type magnitude response of the antialiasing filter on the measurement uncertainty of the power signal amplitude characteristic was specified. The values of the minimal sampling frequencies for the power signal spectrum computations were proposed. Use of these frequencies assures the maximum error level at the specified level (0,1%, 1% and 10%). The research includes low-pass realization of the filter magnitude responses approximated by polynomials: Butterworth, Bessel, Chebyschev and elliptic.
Authors and Affiliations
M. SZMAJDA, K. GÓRECKI, J. MROCZKA
Keywords
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