Dynamic models of multilevel converters by using the power oriented graph technique

The advances in power electronics and new needs in renewable energy sources lead the multilevel converters to be advantageous compared to 2-level converters. Since modeling tools can be helpful to design new converter topology, this paper presents the dynamic models of the three basic topologies of multilevel converters: the Diode-Clamped, the Flying-Capacitor and the Cascaded H-Bridge converters. These models have been obtained by using the Power Oriented Graph (POG) technique, that is easy to be employed and implemented in Matlab-Simulink® environment. The proposed models are suitable to simulate high frequency sliding mode control and can be easily modified to model hybrid topologies. Simulation results confirm the validity of the presented models.