Filote C.,Stefan Cel Mare University of Suceava |
Filote C.,Str Universitatii |
Ciufudean C.,Stefan Cel Mare University of Suceava |
Cozgarea A.M.,Stefan Cel Mare University of Suceava
Recent Advances in Signal Processing, Computational Geometry and Systems Theory - ISCGAV'11, ISTASC'11 | Year: 2011
It is well-known the fact that the frequency-domain approach obtained by Fourier transforms (FT) can provide amplitude-frequency spectrum while losing time-related information. In non-stationary regime, some of power electronics equipment connected to grid requires time related information, which cannot be provided by FT. Using discrete wavelet transform (DWT), we can preserve the information concerning time and frequency. In this paper, an wavelet analysis of input current of three-phase rectifier with diode (TPRD) and rectifier with near sinusoidal current (RNSIC) are presented. The experimental results are imported in MATLAB for multi-resolution analysis (MRA). Results of MRA confirm the reduction of RNSIC input current discontinuities, the waveform coming closer to sinusoidal form.