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A Space-Vector Modulation Scheme for Multilevel Open-End Winding Five-Phase Drives

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4 Author(s)
Emil Levi ; School of Engineering, Technology and Maritime Operations, Liverpool John Moores University, Liverpool, U.K. ; I Nyoman Wahyu Satiawan ; Nandor Bodo ; Martin Jones

Open-end winding three-phase variable speed drives with dual-inverter supply have been extensively investigated for various applications, including series hybrid powertrains and propulsion motors. The topology is simple to realize while offering a higher number of switching states without the need for capacitor voltage balancing algorithms, when compared to the standard multilevel converters. This paper extends the open-end winding concept to a five-phase drive. A relatively simple space-vector modulation (SVM) algorithm, based on the already well-understood five-phase two-level drive SVM method, is developed. The proposed modulation technique has the advantage of being straightforward to implement and, like its two-level counterpart, is able to generate output voltages with minimum low-order harmonic content. The method generates up to 17-level output phase voltage and, therefore, offers superior harmonic performance when compared to the two-level five-phase modulation. The developed scheme is verified via detailed simulations and experiments, using a five-phase induction machine operating under open-loop V/f control.

Published in:

IEEE Transactions on Energy Conversion  (Volume:27 ,  Issue: 1 )