Single-Phase Compact Active Rectifier with 31-Level Voltage Resolution using Modified Packed U-Cell Topology and Model Predictive Control

Regarding the increasing penetration of renewable energy sources and dc loads into grids, improving the harmonic performance of the converters has become a substantial power electronic concern during the last two decades. As a promising accomplishment, this paper introduces a new compact multilevel active rectifier with a31-1eve1vo1tage resolution on the grid side to address the power quality concerns. The proposed high-resolution Compact Active Rectifier (CAR) is configured based on modified packed U-cell topology and is able to supply four independent dc loads with different voltages. Concerning the variable structure behavior of the CAR, a Model Predictive Controller (MPC) is also considered to track the desired objectives. The implementation results under various dynamic test conditions confirm that the MPC-based CAR remarkably improves the power quality in both ac and dc sides of the converter while using a second-order filter is no longer required.