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Voltage quality bounds of multilevel converters

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3 Author(s)
Mehlmann, G. ; Univ. of Erlangen Nuremberg, Erlangen, Germany ; Ruderman, A. ; Herold, G.

Multilevel converters feature a staircase voltage waveform, resulting in a high voltage quality. By a practical time domain approach, upper and lower bounds of the voltage quality can be derived as closed form analytical expressions. The voltage quality bounds are introduced for single- and three-phase converters with an arbitrary number of voltage levels and for different modulation indices. PWM voltage quality comparison with the theoretical lower and upper bounds is useful for a fair assessment of different switching strategies and for an improved converter control. The analytic definitions for the voltage quality bounds allow the use in everyday engineering practice.

Published in:

Energy Conference and Exhibition (ENERGYCON), 2012 IEEE International

Date of Conference:

9-12 Sept. 2012