Abstract
For electric power quality improvement should be identified and followed the deforming consumers. This is necessary, because the number of equipments producing harmonic distortion is increasing, primarily by expanding the use of static power converters. This paper presents the study of the deforming state generated by the AC/AC converter with full-wave AC control using two SCRs (silicon – controlled rectifier) connected in inverse parallel. The harmonic spectrums of distorted current and voltage signals are determined by the load and the thyristors delay angle. For this study, we use Fourier and Wavelet transform. A multiresolution signal decomposition technique is presented in the analysis of the deforming signals from the AC/AC converter. Ill. 10, bibl. 8 (in English; abstracts in English and Lithuanian). DOI: http://dx.doi.org/10.5755/j01.eee.121.5.1643
Highlights
Power quality problems today are more frequent due to the power disturbances such as harmonics, flicker, swells/sags, interruption, unbalance voltage etc
Wavelet transform is a recent signal processing tool used in power quality analysis that is useful for the analysis of non-stationary signals [4]
This paper presents the study of the deforming state generated by the AC/AC converter with full-wave AC control using two SCRs connected in inverse parallel
Summary
Power quality problems today are more frequent due to the power disturbances such as harmonics, flicker, swells/sags, interruption, unbalance voltage etc. For harmonic analysis the discrete Fourier transform (DFT) give satisfactory results when the signals (voltage or current) are periodical [3]. Where is the thyristors delay angle and 1 is the phase shift between current and voltage (determined by the load type) determined from the relation
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