Title :
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
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;
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
DOI :
10.1109/PEDS.2009.5385807
