Improved PWM method of forced commutated cycloconvertors

Author

Shin, D.-H. ; Cho, G.-H. ; Park, S.-B.

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea

Volume

136

Issue

3

fYear

1989

fDate

5/1/1989 12:00:00 AM

Firstpage

121

Lastpage

126

Abstract

An unrestricted frequency changer (UFC), a well known forced commutated cycloconverter (FCC), is known to be suitable for variable speed AC drives, because it operates in all four quadrants and generates no subharmonic components. However, lower order undesired components in the output voltage and in the input current are still large and cause problems in practical applications. In the paper, an improved PWM method is proposed to reduce lower order harmonic components. The new method can completely eliminate two undesired harmonic components in the low output voltage ranges with a relatively low switching frequency. This harmonic elimination occurs both on the output voltage and on the input current simultaneously. The harmonic characteristics of the proposed FCC are shown by computer simulations and verified by experiments.<>

Keywords

commutation; cycloconvertors; frequency convertors; harmonics; pulse width modulation; forced commutated cycloconvertors; harmonic elimination; improved PWM method; input current; lower order harmonic components; output voltage; unrestricted frequency changer; AC-AC power conversion; Frequency conversion; Harmonic analysis; Pulse width modulation;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings B

Publisher

iet

ISSN

0143-7038

Type

jour

Filename

18933