Overview of Synchronization Methods and Structures of Current Controllers of Grid-Following Converters
The main blocks of the control system of the power converter following the grid are the grid synchronization block and the current regulator. The choice of structure and method of implementation of these units has a decisive impact on the reliability and quality of power supply to consumers in power systems with a high penetration of renewables. A non-optimal choice can result in the converter being disconnected from the grid and creating a generation power deficit, which can lead to frequency reductions in the power system and the disconnection of consumers by the protection automatics. This paper compares the most popular synchronization methods and converter current controller structures according to their efficiency. The purpose of this review is to determine the optimum synchronization method and converter current controller structure.