Performance assessment of 18-pulse 3-phase rectifiers using harmonic reducing auto-transformers

Author

Salmon, J. ; Roberge, I.

Author_Institution

Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta.

fYear

2005

fDate

1-4 May 2005

Firstpage

637

Lastpage

640

Abstract

The operation of parallel-connected 18-pulse 3-phase rectifiers are described that use non-isolating multi-winding input auto-transformers. Configurations are examined that use both ac and dc inter-phase blocking reactors for limiting the circulating currents between the parallel diode rectifiers. The work presented in this paper represents ongoing research to accurately simulate the operation of multi-pulse rectifiers. Numerous performance curves are presented, obtained using SPICE simulations, that monitor the harmonic cancelling and current sharing features of the various rectifier configurations against the per-unit size of the magnetic components used. The effect on the rectifier performance due to imbalances associated with the transformer output voltages and 3-phase inductances are highlighted. The per-unit current imbalances between the parallel connected rectifier bridges are linked to the degree of voltage and inductance imbalances present

Keywords

autotransformers; bridge circuits; diodes; harmonics suppression; rectifying circuits; transformer windings; SPICE simulations; harmonic reducing autotransformers; interphase blocking reactors; magnetic components; multipulse rectifier bridges; nonisolating multiwinding input autotransformers; parallel diode rectifiers; parallel-connected 18-pulse 3-phase rectifiers; performance assessment; Diodes; Inductance; Inductors; Magnetic cores; Magnetic flux; Rectifiers; Virtual colonoscopy; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2005. Canadian Conference on

Conference_Location

Saskatoon, Sask.

ISSN

0840-7789

Print_ISBN

0-7803-8885-2

Type

conf

DOI

10.1109/CCECE.2005.1557011

Filename

1557011