A multi-carrier pulse width modulator for the auxiliary converter and the diode rectifier

Author

Hou, Chung-Chuan ; Cheng, Po-Tai

Author_Institution

Dept. of Electr. Eng., Chung Hua Univ., Hsinchu, Taiwan

fYear

2009

fDate

2-5 Nov. 2009

Firstpage

393

Lastpage

398

Abstract

The auxiliary converter (AXC) has been presented as a cost-effective solution to retrofit the conventional diode rectifier into a unity-power-factor and regeneration-enabled front-end. However, the pulse width modulation (PWM) switching of the AXC often causes circulating current between the AXC and diode rectifier. The zero vectors of each PWM cycle induce zero sequence current, which results in increased operational losses and electrical noise. This study analyzes the circulating current and investigates the use of multi-carrier PWM for its suppression. This multi-carrier PWM can synthesize the desired output voltage without using zero vectors for the active filtering and re-generation operations of the AXC, thus significantly suppress the circulating current. Test results are presented to validate the proposed multi-carrier PWM in the AXC system.

Keywords

PWM power convertors; power factor; rectifiers; PWM switching; active filtering; auxiliary converter; diode rectifier; multicarrier PWM; multicarrier pulse width modulator; regeneration-enabled front-end; unity-power-factor; zero sequence current; Active filters; Diodes; Filtering; Pulse width modulation; Pulse width modulation converters; Rectifiers; Space vector pulse width modulation; System testing; Virtual colonoscopy; Voltage control; active filter; auxiliary converter; circulating current; multi-carrier PWM;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Drive Systems, 2009. PEDS 2009. International Conference on

Conference_Location

Taipei

Print_ISBN

978-1-4244-4166-2

Electronic_ISBN

978-1-4244-4167-9

Type

conf

DOI

10.1109/PEDS.2009.5385807

Filename

5385807