Generalization of the Y-differential autotransformer for 12- and 18-pulse converters |
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| Affiliation: | 1. Joining and Welding Research Institute, Osaka University, 11-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan;2. Toray Industries, Inc., 9-1, Oe-cho, Minato-ku, Nagoya 455-8502, Japan;1. Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 446-701 Yongin, Republic of Korea;2. Department of Chemistry, Inha University, Incheon, Republic of Korea;3. University of New Orleans, Dept. of Mechanical Engineering, New Orleans, LA 70148, United States;1. Department of Civil Engineering, Wuhan University, Wuhan, China;2. Department of Engineering, Lancaster University, Lancaster LA1 4YR, UK;3. School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK;1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;2. Centre for Nanoscience and Engineering, Indian Institute of Science, Bangalore 560012, India |
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| Abstract: | This work proposes a methodology to generalize the Y-connections for 12- and 18-pulse autotransformers. A single mathematical expression, obtained through simple trigonometric operations, represents all the connections. The proposed methodology allows choosing any ratio between the input and the output voltages. The converters can operate either as step-up or as step-down voltage. To simplify the design of the windings, graphics are generated to calculate the turn-ratio and the polarity of each secondary winding, with respect to the primary winding. A design example, followed by digital simulations, illustrates the presented steps. Experimental results of two prototypes (12 and 18 pulses) are presented. The results also show that high power factor is an inherent characteristic of multi-pulse converters, without any active or passive power factor pre-regulators needs. |
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