Asymmetrical modulation and over-modulation techniques of parallel connected NPC-PWM inverters for AC motor drives

Author

Matsui, K. ; Kawata, Yasutaka ; Ueda, Fukashi ; Tsuboi, Kazuo ; Iwata, Koji

Author_Institution

Dept. of Electr. Eng., Chubu Univ., Kasugai, Japan

Volume

1

fYear

1996

fDate

18-21 Mar 1996

Firstpage

305

Abstract

A technique of parallel connection of power devices using current sharing reactors for neutral point clamped (NPC) PWM inverters is reported in this paper. The proposed modulation techniques can improve the output characteristics such as output voltage level or output harmonics. The output voltage waveforms of the proposed inverter have certain voltage levels during their half cycles, thus it is anticipated that it will be difficult to analyze the output waveforms. For such waveforms, a frequency analysis approach is described, whose results are verified by experiments

Keywords

AC motor drives; DC-AC power convertors; PWM invertors; machine testing; machine theory; power system harmonics; waveform analysis; AC motor drives; asymmetrical modulation; current sharing reactors; experiments; frequency analysis approach; half cycles; neutral point clamped PWM inverters; output harmonics; output voltage level; output voltage waveforms; over-modulation techniques; parallel connection; Inductors; Leg; Phase modulation; Pulse width modulation; Pulse width modulation inverters; Switching frequency; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Advanced Motion Control, 1996. AMC '96-MIE. Proceedings., 1996 4th International Workshop on

Conference_Location

Mie

Print_ISBN

0-7803-3219-9

Type

conf

DOI

10.1109/AMC.1996.509423

Filename

509423