Comparison of control techniques for three-phase distributed generation based on VOC and DPC

Abstract

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.