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In the literature, wavelet techniques are proposed for the power quality analysis of power systems. The choice of most suitable mother wavelet, which is a key to any meaningful wavelet analysis, depends on the application and no general rule exists for the selection. This paper demonstrates the selection of an appropriate mother wavelet for power system harmonic analysis. Different mother wavelets...
This paper presents a unique comparison between Wavelet Packet Transform (WPT) and Discrete Wavelet Transform (DWT) in the power system harmonics scenario. The signals used are actual tested waveforms which have been obtained using power quality analyzer. The results obtained using WPT and DWT are then compared with IEEE Standard 1459 - 2000 based values. The percentage error has been calculated for...
The present work shows a distinct comparison between wavelet packet transform (WPT) and discrete wavelet transform (DWT) for quantization of power system harmonics. The analysis has been carried out on two sets of actual tested waveforms obtained using power quality analyzer. The results obtained using WPT and DWT are compared with IEEE Standard 1459-2000 based values and percentage error has been...
Fourier transform (FT) based techniques have been traditionally used for power system harmonics analysis. A recent alternative approach of wavelet transform (WT) is applied for non-sinusoidal signal analysis which has been found very useful in power quality studies. The problem of root mean square (RMS) value calculation is an important issue in harmonic analysis. This paper uses a statistical approach...
Widespread applications of power electronic-based loads continue to increase concerns over harmonic distortion. However, it is desired to draw purely sinusoidal current from the distribution network, but this is no longer the case with new generation loads, consisting of power electronic converters. The current harmonics produced by these non-linear loads further result in voltage distortion and leads...
This paper presents a detailed study on the effect of power system voltage unbalance on the harmonics injected by a ac-dc rectifier load. This study gives an insight about the role of sequence voltage components in voltage unbalance analysis. The simulations are carried out in time domain and the frequency spectra of the distorted waveform (input and output) are obtained using fast Fourier transform...
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