Applications of the windowed FFT to electric power quality assessment

TLDR

The windowed FFT is a time‑windowed version of the discrete Fourier transform. The paper investigates applying the windowed FFT to assess electric power quality. By adjusting and shifting the window width—narrow for detailed analysis and wide for rapid scanning—the authors analyze large power‑quality datasets and discuss the underlying mathematics. The authors demonstrate the method’s mathematics and illustrate its application to power‑quality assessment.

Abstract

This paper discusses the application of the windowed fast Fourier transform to electric power quality assessment. The windowed FFT is a time windowed version of the discrete time Fourier transform. The window width may be adjusted and shifted to scan through large volumes of power quality data. Narrow window widths are used for detailed analyses, and wide window widths are used to move rapidly across archived power quality data measurements. The mathematics of the method are discussed and applications are illustrated.