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Harmonic Estimation Using Discrete Wavelet Transform

A.S.S. Murugan, M .A. Jeba Selvam

The radical development in the area of power semiconductor switching devices have paved the way for wide use of power electronics based nonlinear loads from industries to the households. In the era of power semiconductor based appliances, defilement in power supply waveform due to harmonics is critical from power quality and reliability point of view. An accurate estimation of harmonics is the basic requirement in the field of harmonic analysis. In this paper, an effective signal processing technique, Discrete Wavelet Transform (DWT) is proposed for the estimation of harmonics in a power system, which is created due to nonlinear loads present. The proposed method is examined with simulated signals of an AC Motor Drive. The method based on Wavelet Transform overcomes the shortcomings of conventional Fast Fourier Transform (FFT) in harmonic estimation.