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An open-ended winding IM drive with multilevel 12-sided polygonal vectors with symmetric triangles
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| Author(s) |
SUDHARSHAN KAARTHIK, K GOPAKUMAR, Jaison MATHEW, Tore UNDELAND |
| Abstract |
Multilevel inverters with hexagonal voltage space vector structures have improved performance of in-duction motor drives compared to that of the two level inverters. Further reduction in the torque rippleon the motor shaft is possible by using multilevel dodecagonal (12-sided polygon) voltage space vectorstructures. The advantages of dodecagonal voltage space vector based PWM techniques are the completeelimination of fifth and seventh harmonics in phase voltages for the full modulation range and the exten-sion of linear modulation range. This paper proposes an inverter circuit topology capable of generatingmultilevel dodecagonal voltage space vectors with symmetric triangles, by cascading two asymmetricthree level inverters with isolated H-Bridges. This is made possible by proper selection of DC link volt-ages and the selection of resultant switching states for the inverters. In this paper, a simple PWM timingcalculation method is proposed. Experimental results have also been presented in this paper to validatethe proposed concept. |
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| Filename: | 0004-epe2014-full-16304696.pdf |
| Filesize: | 534.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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