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Digitally-implemented naturally sampled PWM suitable for multilevel converter control

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1 Author(s)
G. R. Walker ; Sch. of Inf. Technol. & Electr. Eng., Univ. of Queensland, Brisbane, Australia

For dynamic closed loop control of a multilevel converter with a low pulse number (ratio of switching frequency to synthesized fundamental), natural sampled pulse-width modulation (PWM) is the best form of modulation. Natural sampling does not introduce distortion or a delayed response to the modulating signal. However previous natural sampled PWM implementations have generally been analog. For a modular multilevel converter, a digital implementation has advantages of accuracy and flexibility. Re-sampled uniform PWM is a novel digital modulation technique which approaches the performance of natural PWM. Both hardware and software implementations for a five level multilevel converter phase are presented, demonstrating the improvement over uniform PWM.

Published in:

IEEE Transactions on Power Electronics  (Volume:18 ,  Issue: 6 )