Abstract
In this paper a new topology is proposed for energy storage and the power distribution using Ultra- capacitors in cascaded multilevel inverters. This consists of hybrid cascaded multilevel inverter (HCMI) topologies and corresponding control strategies are applied to motor drive, interfacing both dc sources and capacitor energy storage elements. For high power motor drive application this proposed topology has a capability to produce high voltage at fundamental switching frequency makes it possible to use switches with low voltage and current ratings. The major advantages of this proposed control method are reduced switching loss, improved efficiency with less number of dc sources, elimination of harmonics and the ability of the capacitor voltage to be successfully maintained at the desired value when the machine is in transient state. In this paper a 7-level cascaded multilevel inverter with motor drive is considered. Finally, the simulation results validate the concept of this topology.
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