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On Abolishing Symmetry Requirements in the Formulation of a Five-Level Selective Harmonic Elimination Pulse-Width Modulation Technique

Lookup NU author(s): Dr Mohamed Dahidah

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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

Publication metadata

Author(s): Dahidah MSA, Agelidis VG, Rao MVC

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Power Electronics

Year: 2006

Volume: 21

Issue: 6

Pages: 1833-1837

ISSN (print): 0885-8993

ISSN (electronic): 1941-0107

Publisher: IEEE

URL: http://dx.doi.org/10.1109/TPEL.2006.883547

DOI: 10.1109/TPEL.2006.883547

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