PWM control and experiment of modular multilevel converters

Author

Hagiwara, Makoto ; Akagi, Hirofumi

Author_Institution

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

fYear

2008

fDate

15-19 June 2008

Firstpage

154

Lastpage

161

Abstract

A modular multilevel converter (MMC) is one of the next-generation multilevel PWM converters intended for high- or medium-voltage power conversion without transformers. The MMC consists of cascade connection of multiple bidirectional PWM chopper-cells and floating dc capacitors per leg, thus requiring voltage-balancing control of their chopper-cells. However, no paper has been discussed explicitly on voltage-balancing control with theoretical and experimental verifications. This paper deals with two types of modular multilevel PWM converters with focus on their circuit configurations and voltage-balancing control. Combination of averaging and balancing controls enables the MMCs to achieve voltage balancing without any external circuit. The viability of the MMCs as well as the effectiveness of the PWM control method is confirmed by simulation and experiment.

Keywords

PWM power convertors; choppers (circuits); voltage control; MMC; PWM control; floating dc capacitors; high-voltage power conversion; medium-voltage power conversion; modular multilevel converters; multiple bidirectional PWM chopper-cells; voltage-balancing control; Capacitors; Circuits; Leg; Medium voltage; Power conversion; Power engineering and energy; Pulse width modulation; Pulse width modulation converters; Transformers; Voltage control; Medium-voltage power conversion; multilevel converters; voltage-balancing control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2008. PESC 2008. IEEE

Conference_Location

Rhodes

ISSN

0275-9306

Print_ISBN

978-1-4244-1667-7

Electronic_ISBN

0275-9306

Type

conf

DOI

10.1109/PESC.2008.4591917

Filename

4591917