Use of Wavelet Transforms for the Minimization of Harmonics Using Shunt Active Power Filter

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In the modern world, the use of non linear loads have increased due to the industrial revolution. They generate distortions in supply voltage and current waveforms. These distortions in the voltage and current waveform specified as harmonics reduce the quality of the power that is supplied. Hence harmonic reduction becomes a necessary issue and the use of Shunt Active Power Filter (SAPF) for minimizing the harmonic content caused by the non linear load has been discussed in this paper. Here, the wavelet transform based method is used and it provides an alternative for the harmonic analysis. With this method, distortions due to different sub-band harmonics can be easily estimated and each harmonic component can be evaluated. A comparison between the Fast Fourier Transform (FFT) method and wavelet based method in determining the Total Harmonic Distortion (THD) is made. The results depict the effectiveness of the proposed method.
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Harmonics, Shunt Active Power Filter, THD, Wavelet Transforms

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