Measurement of Harmonics and Inter-Harmonics Based on DWFFT

This paper presents a method of measurement of harmonics and interharmonics. Waveform distortions were traditionally regarded as harmonics distortions, fast Fourier transform (FFT) is a basically way to analyses harmonics. However, FFT is just a way to measure waveform distortion in time domain or in frequency. Increasing inter harmonics content in the power system has prompted a need to give them greater attention. In this paper, a method was proposed on discrete wavelet transform (DWT) improved FFT (DWFFT) The propose algorithm is applied to a case studies considering harmonics and interharmonics distortion and the right results are obtained and proved this algorithm is valid.