Three-level inverter configuration with common mode voltage elimination for induction motor drive （To continue）

The multiplicity of vector combinations for vectors of combined three-level inverters plays an important role, when deciding on the modulation scheme, to obtain minimum switching per inverter vector change, as described in the next Section. This is not possible with reduced common- mode three-level inverter structure, obtained with a five-level cascaded H-bridge configuration, as the space vectors loca- tions do not exhibit multiplicity. Moreover, the proposed configuration requires only two power supplies, whereas the scheme with the five-level H-bridge configuration requires six isolated power supplies.