Analysis of Asymmetrical Cascaded Multi-Cell Multilevel Inverter

Multilevel converters are a very interesting alternative for medium and high power drives. Of these topologies the Multicell group is popularly growing due to its advantages such as modularity and scalability. This paper proposes a new topology of cascaded H bridge Multicell 15 level Inverter which is the mixed form of flying capacitor and cascaded group. This inverter is based on the cascaded connection of cells with reduced no of switches. Multicarrier based level shifting pulse width modulation identified as the most promising technique. This paper presents the most relevant control and modulation method of level shifting pulse width modulation LSPWM for multicell inverters to reduce total harmonic distortion –THD. Simulation results obtained in Matlab/Simulink confirms the effectiveness of the cascaded H bridge multicell 15 level inverter with minimum THD.