“…In Lu et al, 7 the authors provided a detailed review of SEA detection methods, and classified them as Fast Fourier Transformation (FFT), short time fast Fourier transformation (STFFT), wavelets transformation (WT), artificial intelligence (AI), statistical, and other methods. Methods based on frequency-domain analysis, like FFT 8,9 ,STFFT 10,11 , and WT 12 methods, came to prominence after it was recognized that SEA causes superposition of pink noise to a PV current signal. 8,9 Pink noise, or 1/f noise, is characterized by a spectral density that is inversely proportional to the frequency.…”