PROJECT TITLE :

Generation of Higher Number of Voltage Levels byStacking Inverters of Lower Multilevel Structureswith Low Voltage Devices for Drives - 2016

ABSTRACT:

This paper proposes a new technique of generating higher range of levels in the voltage waveform by stacking multilevel converters with lower voltage house vector structures. An important feature of this stacked structure is the utilization of low voltage devices whereas attaining higher number of levels. This can realize in depth applications in electrical vehicles since direct battery drive is potential. The voltages of all the capacitors in the structure will be controlled within a switching cycle using the switching state redundancies (pole voltage redundancies). This helps in reducing the capacitor size. Additionally, the capacitor voltages will be balanced irrespective of modulation index and load power factor. To verify the concept experimentally, a nine-level inverter is developed by stacking two five-level inverters and an induction motor is run using V/f management theme. Both steady state and transient results are presented.