Voltage source multilevel converters (VSMCs) have been developed in the last years for high-power applications, due to their capability to work at medium-voltage levels without power transformers. The blocking voltage of the power devices has limited the supply voltage of transformer less power converters. But this limit can be overcome if the number of voltage levels of the converter is increased. Moreover, the increment of voltage levels contributes to build a softer AC voltage with the consequent reduction in harmonic distortion. Also, the voltage variation rate (dv/dt) is reduced, diminishing the electromagnetic interference (EMI) problems and other stresses on the power switches.
The classic ...
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