Novel computation-efficient three-phase EPLL-based grid synchronization techniques considering power quality issues

The deterioration of power quality is posing an increasing problem for low and medium voltage grids. At the same time, grid codes place ever stricter requirements for the operation of distributed generation systems, especially regarding fault-ride-through capabilities during more severe grid fault events. Therefore, a proper operation of converter-based power systems needs to be guaranteed, requiring robust and reliable synchronization techniques. Within the scope of this paper, novel topologies of three-phase synchronization systems based on Enhanced Phase-Locked Loops are presented with the main objective to significantly increase computational efficiency. Their parameter dependent properties are assessed based on simulative investigations.