Comparison of Control Techniques for Three-Phase Distributed Generation Based on VOC and DPC

This paper presents a comparison among control strategies of active rectifiers used for grid connected distributed generation systems from renewable sources. The considered techniques are: Voltage Oriented Control (VOC), Direct Power Control (DPC), two DPC based techniques to minimize the Common Mode (CM) emissions called DPC-EMC1 and DPC-EMC2 set up by the authors and their versions based on virtual flux. All the described techniques have been implemented using Matlab-Simulink environment and PLECS. In the results the current injected into the grid, the THD of the injected current vs generated power and vs DC link voltage and the CM voltage are shown.