Harmonic and Interharmonic Detection in Power Quality Applying the Wavelet Synchrosqueezing Transform

Abstract

Power quality has become an increasing problem as harmonic frequencies begin to appear in renewable energy sources and non-linear systems connected to the electrical grid. Interharmonics are frequencies that are not multiples of the fundamental frequency and make harmonic analysis more complicated. This is a challenge for companies and users to improve power quality, so this article proposes the use of the Wavelet Syncrosqueezing Transform (SSWT) method in time-frequency analysis. SSWT proves to have better anti-noise properties and high resolution compared to other methods, such as Continuous Wavelet Transform (CWT) and Short Time Fourier Transform (STFT). The method is validated on simulations and data collected from renewable energy sources, as well as real-time measurements caused by the flicker effect. The results demonstrate the effectiveness of the method in the analysis of signals that present variations in time and frequency.