On abolishing symmetry requirements in the formulation of a five-level selective harmonic elimination pulse-width modulation technique

Dahidah, M.S.A., Agelidis, V.G. and Rao, M.V. (2006) On abolishing symmetry requirements in the formulation of a five-level selective harmonic elimination pulse-width modulation technique. IEEE Transactions on Power Electronics, 21 (6). pp. 1833-1837.

Abstract

Selective harmonic elimination pulse width modulation (SHE-PWM) techniques offer a tight control of the harmonic spectrum of a given voltage waveform generated by a power electronic converter along with a low number of switching transitions. These optimal switching transitions can be calculated through Fourier theory, and for a number of years quarter-wave and half-wave symmetries have been assumed when formulating the problem. It was shown recently that symmetry requirements can be relaxed as a constraint. This changes the way the problem is formulated, and different solutions can be found without a compromise. This letter reports solutions to the switching transitions of a five-level SHE-PWM when both the quarter- and half-wave symmetry are abolished. Only the region of high-modulation indices is reported since the low-modulation indices region requires a unipolar waveform to be realized. Selected simulation and experimental results are reported to show the effectiveness of the proposed method.

Item Type:	Journal Article
Murdoch Affiliation(s):	School of Engineering Science
Publisher:	IEEE
Copyright:	2006 IEEE
URI:	http://researchrepository.murdoch.edu.au/id/eprint/12053

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