Multilevel PWM methods at low modulation indices

Author

Tolbert, Leon M. ; Peng, Fang Zheng ; Habetler, Thomas G.

Author_Institution

Dept. of Electr. & Comput. Eng., Tennessee Univ., Knoxville, TN, USA

Volume

15

Issue

4

fYear

2000

fDate

7/1/2000 12:00:00 AM

Firstpage

719

Lastpage

725

Abstract

When utilized at low amplitude modulation indices, existing multilevel carrier-based PWM strategies have no special provisions for this operating region, and several levels of the inverter go unused. This paper proposes some novel multilevel PWM strategies to take advantage of the multiple levels in both a diode-clamped inverter and a cascaded H-bridges inverter by utilizing all of the levels in the inverter even at low modulation indices. Simulation results show what effects the different strategies have on the active device utilization. A prototype 6-level diode-clamped inverter and an 11-level cascaded H-bridges inverter have been built and controlled with the novel PWM strategies proposed in this paper

Keywords

PWM invertors; amplitude modulation; bridge circuits; power semiconductor diodes; 11-level cascaded H-bridges inverter; 6-level diode-clamped inverter; active device utilization; cascaded H-bridges inverter; diode-clamped inverter; low amplitude modulation indices; multilevel PWM methods; multilevel carrier-based PWM strategies; redundant switching states; Active filters; Amplitude modulation; Diodes; Laboratories; Pulse width modulation; Pulse width modulation inverters; Reactive power; Switches; Switching frequency; Voltage;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.849042

Filename

849042