C. Buccella, M. G. Cimoroni, Carlo Cecati, A. D. Di Tommaso, C. Nevoloso, G. Schettino, S. Meo
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Investigation about selective harmonic elimination in unbalanced multilevel inverters
In this paper 5 and 7 levels cascaded H-bridges inverters are considered, feeding by unequal dc voltage sources. The effect of these unbalancing operation is examined concerning harmonic analysis and total harmonic distortion of the output voltages. The system of equations, obtained by the expansion in the Fourier series of phase output voltage, is solved by applying a method of graphic solution that allows obtaining the switching angles able to eliminate the lower order harmonics.
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