Model Predictive Control of A Single-Stage Flying Inductor Based Buck-Boost Grid-Connected Common-Ground Inverter

In this paper, the Model Predictive Control (MPC), of a transformer-less single-phase single-stage grid-tied current-source inverter is presented. The common-grounding feature of this converter increases its reliability and suppresses the leakage current. Moreover, current source inverters (CSIs) are considered as good options due to their higher reliability, fault tolerant capabilities, quasi soft switching and using lower capacitor values in comparison with the others. MPC, which is considered as one of the best control methods for power converters, is implemented on this converter. A proper discretization method, an approximation of the parameters, and 2 horizons for calculations of the cost function is used in the MPC controller. In this paper, first, the four operating modes of the converter are demonstrated. Then, the implemented MPC algorithm is described. Simulation results are demonstrated which validates the theoretical calculations and investigations.