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Published Article / ENY-ARTICLE-2008-005

Measurement of IEC Groups and Subgroups by using Advanced Spectrum Estimation Methods

Bracale, A (Dipartimento di Ingegneria Elettrica, Universita degli Studi di Napoli “Federico II”) ; Carpinelli, G (Dipartimento di Ingegneria Elettrica, Universita degli Studi di Napoli “Federico II”) ; Leonowicz, Z (Wroclaw University of Technology, Poland) ; Lobos, T (Wroclaw University of Technology, Poland) ; Rezmer, J (Wroclaw University of Technology, Poland)


Abstract: IEC Standards characterize the waveform distortions in power systems with the amplitudes of harmonic and interharmonic groups and subgroups. These groups/subgroups utilise the waveform spectral components obtained by using a fixed frequency resolution DFT; while this choice represents a good compromise among different aims such as the need of good accuracy, simplification and unification. In some cases the power system waveforms are characterized by spectral components that the DFT with fixed frequency resolution can not capture with enough accuracy. This paper investigates the possibility of a group/subgroup evaluation using advanced spectrum estimation methods: the adaptive Prony, ESPRIT and root-MUSIC methods. The paper presents also the results of applications of these methods to test waveforms and to waveforms obtained from simulations of a real DC arc furnace plant.

Keyword(s): spectrum estimation ; waveform distortion analysis ; subspace methods ; Prony method ; ESPRIT method ; MUSIC method ; discrete Fourier transform ; dc arc furnaces
Note: IMTC 2006 – Instrumentation and Measurement Technology Conference, Sorrento, Italy 24-27 April 2006,

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Record created 2008-03-05, last modified 2008-03-09

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