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A Novel Polygon Based 18-Pulse AC–DC Converter for Vector Controlled Induction Motor Drives

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3 Author(s)
Singh, B. ; Dept. of Electr. Eng., Indian Inst. of Technol., New Delhi ; Bhuvaneswari, G. ; Garg, V.

This paper presents a novel configuration of an autotransformer based 18-pulse ac-dc converter for improving the power quality at the point of common coupling (PCC) in variable frequency induction motor drives (VFIMDs). The polygon based connection of autotransformer for achieving 18-pulse rectification is utilized to result in reduction in rating of the magnetics. The design of the autotransformer is carried out for an 18-pulse ac-dc converter feeding a vector controlled induction motor drive (VCIMD). Moreover, the autotransformer design is modified for making it suitable for retrofit applications, where presently a 6-pulse diode bridge rectifier is used. The effect of load variation on VCIMD is also studied and the performance of the proposed 18-pulse ac-dc converter is compared in terms of different power quality indices on both ac as well as dc side with other ac-dc converters. A laboratory prototype of the proposed autotransformer based 18-pulse ac-dc converter feeding a 10-hp induction motor drive is developed to verify the design and simulated results

Published in:

Power Electronics, IEEE Transactions on  (Volume:22 ,  Issue: 2 )

Date of Publication:

March 2007

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