A modular multilevel PWM inverter for medium-voltage motor drives

Author

Hagiwara, Makoto ; Nishimura, Kazutoshi ; Akagi, Hirofumi

Author_Institution

Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo, Japan

fYear

2009

fDate

20-24 Sept. 2009

Firstpage

2557

Lastpage

2564

Abstract

This paper presents a modular multilevel PWM inverter for medium-voltage motor drives, focusing on its control method and operating performance. It is especially suitable for fans, blowers, pumps, and compressors, the load torque of which is proportional to a square of rotating speed. Particular attention is paid to dc-capacitor voltage fluctuation of each chopper-cell because it may affect the voltage rating of power switching devices used. This paper derives theoretical equations related to an amount of the voltage fluctuation. A laboratory system rated at 400 V and 15 kW is designed and built up to confirm the validity and effectiveness of the nine-level (17-level in line-toline) PWM inverter intended for medium-voltage motor drives.

Keywords

PWM invertors; motor drives; blowers; compressors; dc-capacitor voltage fluctuation; fans; load torque; medium-voltage motor drives; modular multilevel PWM inverter; power 15 kW; power switching devices; pumps; voltage 400 V; voltage fluctuation; Cascade connection; medium-voltage motor drives; modular multilevel PWM inverters;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE

Conference_Location

San Jose, CA

Print_ISBN

978-1-4244-2893-9

Electronic_ISBN

978-1-4244-2893-9

Type

conf

DOI

10.1109/ECCE.2009.5316479

Filename

5316479