Wavelet Transform Based Filter to Remove the Notches from Signal Under Harmonic Polluted Environment
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The work proposes to annihilate the notches present in the synchronizing signal required for converter operation appearing due to switching of semiconductor devices connected to the system in the harmonic polluted environment. The disturbances in the signal are suppressed by wavelet based novel filtering technique. In the proposed technique, the notches in the signal are determined and eliminated by the wavelet based multi-rate filter using ‘Daubechies4’ (db4) as mother wavelet. The computational complexity of the adapted technique is very less as compared to any other conventional notch filtering techniques. The proposed technique is developed in MATLAB/Simulink and finally validated with dSPACE-1103 interface. The recovered signal, thus obtained, is almost free of the notches.
KeywordsDownsampling Filter Notches Upsampling Wavelets
Indian Institute of Technology (Indian School of Mines), Dhanbad for providing financial grant under Faculty Research Scheme Vide No. FRS (35)/2012-13/EE.
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