A novel symmetrical cascade h-bridge multi-level inverter topology with reduced switching devices

This paper proposes a new structure for cascade h-bridge (CHB) based modular multi-level voltage source inverter. As with the correct arrangement of power semiconductor switches and voltage sources, the proposed inverter can provide a high number of output levels with minimum requirements to the circuit devices. By reducing these requirements, cost and circuit size significantly reduce, the inverter control becomes easier and also the system reliability enhances. Furthermore the simulation and also experimental results prove the feasibility of implementing the proposed inverter topology.