Multilevel Current Source Inverters with Phase Shifted Trapezoidal PWM

Author

Xu, D. ; Wu, B.

Author_Institution

Dept. of Electr. & Comput. Eng., Ryerson Univ., Toronto, Ont.

fYear

2005

fDate

16-16 June 2005

Firstpage

2540

Lastpage

2546

Abstract

A 7-level current source inverter (CSI) is proposed for high-power applications. The inverter topology consists of three bridge current source inverters whose outputs are connected in parallel for a large induction motor. The multilevel inverter is fed by an 18-pulse SCR rectifier with three isolated outputs for the reduction of supply-side current THD and the elimination of possible circulating current among the inverters. A phase-shifted trapezoidal PWM (TPWM) scheme is proposed for the inverter to generate multiple current levels. Optimal phase angles are investigated for the reduction of inverter current THD and weighted THD (WTHD). Similar to multilevel voltage source inverters, the multilevel CSI can produce motor-friendly current and voltage waveforms with limited switching frequencies, which is a desirable feature for large motor drives

Keywords

PWM invertors; harmonic distortion; induction motor drives; network topology; phase shifters; rectifying circuits; switching convertors; THD; induction motor drives; inverter topology; multilevel bridge current source inverters; phase-shifted trapezoidal PWM scheme; switching frequencies; voltage source inverters; Bridge circuits; Current supplies; Induction generators; Induction motors; Pulse width modulation inverters; Rectifiers; Switching frequency; Thyristors; Topology; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2005. PESC '05. IEEE 36th

Conference_Location

Recife

Print_ISBN

0-7803-9033-4

Type

conf

DOI

10.1109/PESC.2005.1581990

Filename

1581990