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.
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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.
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|Murdoch Affiliation:||School of Engineering Science|
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