Fundamentals of a new diode clamping multilevel inverter

摘要

The conventional diode clamping inverter suffers from suchnproblems as DC link unbalance, indirect clamping of the inner devices,nturn-on snubbing of the inner DC rails as well as series association ofnthe clamping diodes etc. It is due largely to these problems that thenapplication of the conventional diode clamping inverter in practice hasnbeen deterred, in spite of the growing discussion in the literature. Thenpaper proposes a new diode clamping inverter, which works without thenseries association of the clamping diodes. An auxiliary resistivenclamping network solving the indirect clamping problem of the innerndevices is also discussed for both the new and conventional diodenclamping inverter. Operation principle, clamping mechanism, auxiliarynclamping as well as experimentation are presented