Harmonic analysis of parallel-connected 12-pulse uncontrolled rectifier without an interphase transformer

Author

Tzeng, Y.-S.

Author_Institution

Dept. of Electr. Eng., Oriental Inst. of Technol., Pan Chiau, Taiwan

Volume

145

Issue

3

fYear

1998

fDate

5/1/1998 12:00:00 AM

Firstpage

253

Lastpage

260

Abstract

The author presents a harmonic analysis of a parallel-connected 12-pulse uncontrolled bridge rectifier without an interphase transformer (IPT). Five normal operating modes of the specific rectifier circuit are classified, using an analytical method by deriving instantaneous AC current and DC voltage waveform equations. The discrete Fourier transformation algorithm is then carried out to obtain both current and voltage harmonic contents. Both the AC current and DC voltage harmonics for rectifiers with and without an IPT have been investigated to discuss the influence of the IPT on rectifier harmonics. Simulation results reveal that discrepancies in harmonic contents of both AC current and DC voltage of the two rectifier circuits are marked. It is noted that, for extremely light load up to rated load conditions, the total harmonic distortion (THD) of line-supply current is reduced, while the THD of DC output voltage is increased when the IPT is deleted from the rectifier circuit

Keywords

Fourier transforms; bridge circuits; harmonic analysis; harmonic distortion; rectifying circuits; AC voltage harmonics; DC voltage harmonics; current harmonic content; discrete Fourier transformation algorithm; harmonic analysis; instantaneous AC current waveform; instantaneous DC voltage waveform; normal operating modes; parallel-connected 12-pulse uncontrolled rectifier; rectifier circuit; total harmonic distortion; voltage harmonic content;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings -

Publisher

iet

ISSN

1350-2352

Type

jour

DOI

10.1049/ip-epa:19981850

Filename

681854