Abstract
This study proposes a multilevel inverter with optimised structure from switching device number point of view. Configuration of the presented multilevel inverter is modular and extendable. Three different methods are introduced to determine the magnitude of DC voltage sources. Characteristics of inverter topology based on suggested methods are given and compared with each other. Also, the proposed multilevel inverter is compared with some similar topologies in terms of controlled switches, driver circuits, DC voltage sources and total blocking voltage to verify its advantages and probable disadvantages where the results show the superiority of the proposed topology in the comparison items. Selective harmonic elimination pulse width modulation technique is applied to achieve output voltage with high quality. Finally, a laboratory prototype of the proposed multilevel inverter is implemented and then, the experimental and simulation results are derived to validate the inverter capability in generating staircase waveforms.
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