Fast-responding measurements of power system harmonics using discrete and fast fourier transforms with low spectral leakage

Andrew J. Roscoe, R. Carter, A. Cruden, Graeme M. Burt

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Abstract

Conventional wisdom dictates that a Fast Fourier Transform (FFT) will be a more computationally effective method for measuring multiple harmonics than a Discrete Fourier Transform (DFT) approach. However, in this paper it is shown that carefully coded discrete transforms which distribute their computational load over many frames can be made to produce results in shorter execution times than the FFT approach, even for large number of harmonic measurement frequencies. This is because the execution time of the presented DFT actually rises with N and not the classical N2 value, while the execution time of the FFT rises with Nlog2N.

Original languageEnglish
Title of host publicationRenewable power generation (RPG 2011)
Subtitle of host publicationproceedings
Place of PublicationNew York
PublisherIEEE
Pages1-6
Number of pages6
DOIs
Publication statusPublished - 2011
Event1st IET Renewable Power Generation Conference - Raddison Blu, Edinburgh, United Kingdom
Duration: 6 Sep 20118 Sep 2011

Conference

Conference1st IET Renewable Power Generation Conference
CountryUnited Kingdom
CityEdinburgh
Period6/09/118/09/11

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Keywords

  • fast-responding
  • measurements
  • power system
  • harmonics
  • low spectral leakage
  • fast fourier
  • power system harmonics
  • power quality
  • harmonic analysis
  • fourier transforms

Cite this

Roscoe, A. J., Carter, R., Cruden, A., & Burt, G. M. (2011). Fast-responding measurements of power system harmonics using discrete and fast fourier transforms with low spectral leakage. In Renewable power generation (RPG 2011): proceedings (pp. 1-6). New York: IEEE. https://doi.org/10.1049/cp.2011.0140