Title :
Fast voltage detection for a single-phase dynamic voltage restorer (DVR) using morphological low-pass filters
Author :
Zhou, Hui ; Zhou, Jing ; Qi, Zhi-ping
Author_Institution :
Inst. of Electr. Eng., Chinese Acad. of Sci., Beijing
Abstract :
In this paper, we introduce a Mathematical Morphology(MM) theory based low-pass filter to preprocess the single-phase voltage sag signal, to filter out noises and any other interferences in the sampled signal. A comparison between the MM filter and traditional low-pass filters is carried out to analyze the applicability and accuracy of the MM filter. The selection of structural element is discussed as well according to the filtering result. In addition, we introduce a "Specific Harmonic Elimination" method to eliminate certain low frequency harmonic of the sampled voltage after dq transformation, which could greatly simplify the design of the low-pass filter. Then a elliptic filter is used for constant component abstraction. Software simulation result has verified the practicability of the algorithm.
Keywords :
low-pass filters; power harmonic filters; power supply quality; fast voltage detection; frequency harmonics; morphological low-pass filters; single-phase dynamic voltage restorer; single-phase voltage sag signal; Digital filters; Filtering algorithms; Filtering theory; Low pass filters; Morphology; Power harmonic filters; Power system harmonics; Power system transients; Signal processing algorithms; Voltage fluctuations; Dq transformation; dynamic voltage restorer (DVR); mathematical morphology(MM) theory; software phase locked loop (SPLL); voltage sag;
Conference_Titel :
Electric Utility Deregulation and Restructuring and Power Technologies, 2008. DRPT 2008. Third International Conference on
Conference_Location :
Nanjuing
Print_ISBN :
978-7-900714-13-8
Electronic_ISBN :
978-7-900714-13-8
DOI :
10.1109/DRPT.2008.4523744
