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Rapid voltage changes are a type of power quality disturbance that has not received sufficient attention in the international power quality standards. IEC 61000-4-30, Ed. 3, will introduce a precise method for their detection and analysis. This paper reviews the definitions and the international regulations on RVCs reports some of the results obtained in the measurement of RVCs in different power...
A simple method for real-time synchronization of power quality measurements in low-voltage supply systems is presented. Proper synchronization between the data acquisition window and the power system frequency is necessary to accurately measure the harmonic distortion. The proposed method is based on the use of the standard Discrete Fourier Transform method using a 10-cycle width rectangular window...
Wavelet transform is, at present, one of the most useful digital signal processing tools for time-frequency analysis of power quality disturbances in power systems. This paper presents a review of the applications of wavelet transforms in the measurement and analysis of harmonic distortion in power systems, discussing the performance, advantages and limitations of the different methods proposed in...
This paper presents some of the results obtained in the measurement of voltage distortion in the frequency range 2 to 9 kHz in a low-voltage distribution network. The Discrete Fourier Transform is used for the analysis of the voltage waveform using a 200-millisecond window width and grouping in 200-Hz bands. The paper presents the time-frequency analysis of the results obtained during several days...
This paper studies the effects of the most commonly used window functions, rectangular and Hanning windows, on the processing of harmonics and interharmonics in power system in the framework of the standards defined by the International Electrotechnical Commission. The effect of the two window functions on the processing of fluctuating harmonics and interharmonics is studied. The effect of spectral...
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