Thursday 28th of March 2024
 

18-Pulse Converter Using 3/9 Auto-Transformer


Ahmad Hoteit and Gaitov Hamidovich

This paper focuses to 3/9 phase auto-transformer with multiple windings per phase is powered a 9-phase AC to DC converter this type of transformer has 40o phase shift between the output voltages, it is supplied from a three phase AC source with star or delta connection, to use this type of transformer in aerospace the operation frequency should be at 400Hz in addition to reduce the current harmonic distortion through a three phase line reactor are connected after three phase AC source in this case the current harmonic distortion decreases to value less than 5% and it can be less than 3% level by using an additional suppression devices (Chokes) at the output of the converter, this autotransformer includes three sections each spaced 120o electrically apart. Each section comprises a main winding and a pair of phase shift windings, it is a main element in 18 pulse converters, the multiphase rectification can be analyzed by using orcad simulation software, and shown the comparisons between the odd phases so that the 9 phases has a lower value of the ripple factor which is 0.763 %.

Keywords: autotransformer, line reactor, chokes, multiphase rectification.

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ABOUT THE AUTHORS

Ahmad Hoteit
Kuban State Technological University

Gaitov Hamidovich
Kuban State Technological University


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