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A thorough research on the high-accuracy estimation for the electrical harmonic parameters by using the Interpolated FFT algorithm was conducted. The window type and width are the main factors influencing the analysis precision. Like Bartlett, Hann, and Hamming windows, Bartlett-Hann window has a main lobe at the origin and asymptotically decaying side lobes on both sides. It is a linear combination...
In this paper an S-transform-based expert system is presented for classification of voltage dips. The S-transform (ST) technique is integrated with expert system (ES) model to construct the classifier. Firstly, ST technique is used to extract and quantify the significant features using amplitude factor, harmonic increment, number of amplitude mutation, and maximum value of phase angle shifting. Then...
This paper proposed a novel identification method for voltage sags (dips) based on Hilbert-Huang transform (HHT). Different voltage sag has distinct characters of fault time, three-phase amplitude and harmonics. And HHT is an excellent time-frequency representation and very suitable for feature extraction of voltage sags. The time-frequency absolute values of the instantaneous frequency differential...
To analyze harmonic and inter-harmonic accurately is significant to the stability of power system. The Hilbert-Huang transform (HHT) is adopted to analyze harmonic and interharmonic in order to overcome the shortcoming of FFT method and wavelet analysis method. The power quality signals are decomposed by empirical mode decomposition (EMD) method, and then a series of intrinsic mode function (IMF)...
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