Optimal Switching Sequence Model Predictive Control for Single-Phase Cascaded H-Bridge

The importance of Cascaded H-Bridge (CHB) converters in several applications has led to the introduction of advanced control strategies like Model Predictive Control (MPC). This paper proposes a new adaption of the Optimal Switching Sequence MPC (OSS-MPC) for application in a Single-Phase CHB. The control region of CHB converters is studied in order to apply this new strategy with the objective of tracking grid current and balancing the capacitor voltages of the modules. Another important contribution is the fixed switching period, which is an improvement over other MPC techniques. Starting from the control region, switching sequences are designed considering both switching states and time duration of each state. The method is tested through simulations.