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

fYear

2008

fDate

6-9 April 2008

Firstpage

2042

Lastpage

2046

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/DRPT.2008.4523744

Filename

4523744