DC components and subharmonics of carrier-based PWM

Author

Halasz, Sandor

Author_Institution

Dept. of Electr. Power Eng., Budapest Univ. of Technol. & Econ., Budapest, Hungary

fYear

2012

fDate

4-6 Sept. 2012

Abstract

The use of ultra high speed ac drives has started in the last years e.g. in waste energy recovery systems. In these drives the ratio of the carrier frequency to fundamental one can be lower than 10 - 12. In this case the dc components and subharmonics of carrier-based PWM can have considerable negative effect on the quality of the drive. It is observed that the dc components occur only in case of naturally sampled PWM and they are absent in case of regular PWMs. The expressions for computation of dc voltage and subharmonics of naturally sampled sinusoidal PWM are given and it is observed that in case of space vector modulation the dc components´ value is higher than in case of sinusoidal PWM. The theoretical results are confirmed by experiments.

Keywords

PWM invertors; electric drives; DC components; carrier-based PWM subharmonics; dc component value; dc voltage computation; sinusoidal PWM; space vector modulation; ultrahigh speed ac drives; waste energy recovery systems; Frequency modulation; Harmonic analysis; Induction motors; Pulse width modulation; Stators; Vectors; DC component; Regular and natural PWM; Subharmonics;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Motion Control Conference (EPE/PEMC), 2012 15th International

Conference_Location

Novi Sad

Print_ISBN

978-1-4673-1970-6

Electronic_ISBN

978-1-4673-1971-3

Type

conf

DOI

10.1109/EPEPEMC.2012.6397339

Filename

6397339