Medidor de armónicos trifásico basado en la mSDFT (Three-phase harmonics measurement method based on mSDFT)

Ignacio Carugati (, Carlos Orallo (), Patricio Donato (), Sebastián Maestri (), Daniel Carrica ()

Universidad Nacional de Mar del Plata
This paper appears in: Revista IEEE América Latina

Publication Date: Oct. 2014
Volume: 12,   Issue: 7 
ISSN: 1548-0992

This work presents a three-phase harmonics measurement method based on the mSDFT (Modulated Sliding Discrete Fourier Transform) and a variable sampling period technique. The proposal allows measuring the harmonic components of a three-phase signal and computes the corresponding imbalance by estimating its positive, negative and zero sequence. In addition, an adaptive variable sampling period is used in order to obtain a sampling frequency multiple of the main frequency. mSDFT high rejection to distortions in the electrical network and flexibility of proposed method makes it an interesting alternative for the design of grid power monitors.

Index Terms:
DFT (Discrete Fourier Transform), sequences detector, synchronization   

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