Voltage fluctuation suppression method of floating capacitors in a new modular multilevel converter

Author

Wang, Kui ; Li, Yongdong ; Zheng, Zedong ; Xu, Lie

Author_Institution

Dept. of Electr. Eng., Tsinghua Univ., Beijing, China

fYear

2011

fDate

17-22 Sept. 2011

Firstpage

2072

Lastpage

2078

Abstract

Modular multilevel converter (MMC) is a newly emerging multilevel topology for high power applications in recent years. The voltage fluctuation problem of a new MMC topology is studied in this paper. In order to suppress the voltage fluctuation of the floating capacitors, a control method is proposed by injecting high frequency zero-sequence voltage and phase-to-phase circulating currents. It can be used to drive an induction motor with pump/blower-like load at low speed and improve the performance significantly. A low power three-phase five-level prototype is built up to validate this method.

Keywords

induction motors; power capacitors; power convertors; control method; floating capacitors; high frequency zero-sequence voltage; high power applications; induction motor; low power three-phase five-level prototype; modular multilevel converter; multilevel topology; phase-to-phase circulating currents; pump-blower-like load; voltage fluctuation suppression method; Bridge circuits; Capacitors; Fluctuations; Frequency modulation; Time frequency analysis; Voltage control; Voltage fluctuations;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2011 IEEE

Conference_Location

Phoenix, AZ

Print_ISBN

978-1-4577-0542-7

Type

conf

DOI

10.1109/ECCE.2011.6064042

Filename

6064042