PWM inverter switching strategy for a dual two-level inverter fed open-end winding induction motor drive with a switched neutral

Author

Somasekhar, V.T. ; Gopakumar, K. ; Pittet, A. ; Ranganathan, V.T.

Author_Institution

Center for Electron. Design & Technol., Indian Inst. of Sci., Bangalore, India

Volume

149

Issue

2

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

152

Lastpage

160

Abstract

A dual two-level inverter fed open-end winding induction motor drive is proposed in this paper. A total of 64 voltage space phasor combinations are possible in this scheme since each inverter produces eight voltage space phasors. The scheme produces voltage space phasor locations similar to that of a three-level inverter except that in a three-level inverter the series-connected DC link capacitors carry the load current, which results in undesirable fluctuating voltage space phasors. Also, a three-level inverter requires a bulky DC link capacitor. In the proposed scheme the DC link capacitor carries only the ripple current and hence the voltage space phasor fluctuations are absent. A PWM switching strategy aimed at suppressing the zero sequence currents is proposed, using auxiliary switch-assisted neutral generation

Keywords

PWM invertors; induction motor drives; switching circuits; PWM inverter switching strategy; PWM switching strategy; auxiliary switch-assisted neutral generation; dual two-level inverter fed induction motor drive; load current; open-end winding induction motor drive; ripple current; series-connected DC link capacitors; switched neutral; voltage space phasor combinations; voltage space phasors; zero sequence currents suppression;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings -

Publisher

iet

ISSN

1350-2352

Type

jour

DOI

10.1049/ip-epa:20020127

Filename

997806