DocumentCode :
865852
Title :
Implementation of a Dynamic Voltage Restorer System Based on Discrete Wavelet Transforms
Author :
Saleh, S.A. ; Moloney, C.R. ; Rahman, M. Azizur
Author_Institution :
Univ. of Newfoundland, St. John´´s, NL
Volume :
23
Issue :
4
fYear :
2008
Firstpage :
2366
Lastpage :
2375
Abstract :
This paper presents an implementation of the discrete wavelet transform (DWT) using passive LC filters for operating a dynamic voltage restorer (DVR) system. The proposed implementation is based on designing Butterworth passive LC filters with cutoff frequencies that are identical to cutoff frequencies of DWT associated digital filters. These passive LC filters can detect abnormal conditions that may disrupt the quality of the power supplied to sensitive loads in a power system. Detecting any abnormal condition is realized through extracting high- and low-frequency components present in system voltages using high-pass and low-pass filters, respectively. The designed Butterworth passive LC passive filters are third-order systems to simplify their practical implementation as well as their integration with the test power system and the DVR. Simulation and experimental test results for transient voltage dip and steady-state harmonic distortion cases show significant performance improvement of the DVR system operated by the designed Butterworth passive LC filters. The proposed DWT-operated DVR system using Butterworth passive LC filters is implemented and tested for improving the power quality under different abnormal conditions.
Keywords :
Butterworth filters; discrete wavelet transforms; high-pass filters; low-pass filters; passive filters; power supply quality; power system transients; Butterworth passive LC filters; DWT; discrete wavelet transforms; dynamic voltage restorer system; high-pass filters; low-pass filters; power quality; power system transients; steady-state harmonic distortion; transient voltage dip; Cutoff frequency; Digital filters; Discrete wavelet transforms; Low pass filters; Passive filters; Power harmonic filters; Power system simulation; Power system transients; System testing; Voltage; Butterworth passive $LC$ filters; DWT-associated finite-impulse response (FIR) filters; discrete wavelet transform (DWT); dynamic voltage restorer (DVR) systems and Fourier analysis; power systems transients;
fLanguage :
English
Journal_Title :
Power Delivery, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8977
Type :
jour
DOI :
10.1109/TPWRD.2008.2002868
Filename :
4626363
Link To Document :
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