Simulation and Analysis of Cascaded H-Bridge Multilevel Inverter using Single DC source

Cascaded H-Bridge multilevel inverter is a promising topology and provides alternative way for converters that are used in grid connected photovoltaic, wind power generation and in motor drive. Output power can be expanded simply with modularity and control. Though it has wide application area and tremendous merits, it has greater disadvantage that it uses separate DC supply for each H- Bridge. CMI with single phase transformer and single DC source is proposed for ensure high quality output power waveform. Compared to conventional topology of CMI, proposed topology provides minimization in cost in terms of THD, losses and filter size. Switching angles are calculated for Selective harmonic elimination techniques. Newton- Raphson's method is used to solve non-linear equations of the system.