Published May 29, 2020 | Version v1
Conference paper Open

A Robust Measurement Method for Supraharmonics Under Power Frequency Deviations

  • 1. Fundacio ́n CIRCE
  • 2. Technische Universitat Dresden
  • 3. Instituto Universitario de Investigación CIRCE (Universidad de Zaragoza - Fundación CIRCE)

Description

Abstract—This paper introduces a new measurement method for supraharmonic distortion with improved robustness against power frequency deviations. The proposed method is based on wavelet analysis and it is designed to analyze a 10 cycles measurement interval. Fourier-based methods, instead, must analyze a fixed 200 ms window in order to avoid apparent shifts of the supraharmonic frequency components. The results of the experimental measurements presented in the paper show that the Fourier-based method suggested in IEC 61000-4-7 standard produces results affected by the value of the power frequency. The proposed method, instead, provides results completely inde- pendent of the power frequency. This feature also removes the need of a previous high pass filtering stage, required for the IEC method. Moreover, the proposed method has the additional advantage of working on the same measurement interval as traditional harmonics (below 2 kHz), feature that can reduce the complexity of measurement instruments.

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Funding

MEAN4SG – Metrology Excellence Academic Network for Smart Grids 676042
European Commission