Modeling and Control of Three-Phase Grid-Following Converter via Matlab/Simulink

Abstract

The integration of renewable energy sources (RES) into modern power grids has necessitated the use of grid-following (GFL) converters to ensure reliable synchronization and power exchange between distributed energy resources (DERs) and the grid. GFL converters, which align their operation with the grid's voltage and frequency, play a critical role in stabilizing energy flows in these systems. This paper presents a detailed Matlab/Simulink model of a three-phase GFL converter, focusing on its structure, control unit, and performance in various operational scenarios. Specifically, the study evaluates the converter's performance under normal conditions and when a sudden step change in the real and reactive power references is occurred. Furthermore, this study explores how the number of GFL converters connected to a single feeder impacts the voltage limits allowed for grid connected converters. Unlike previous studies that address only specific aspects of converter operation, this research provides a comprehensive Simulink-based implementation of the entire control unit for GFL converter. Additionally, the simulation results highlights the scalability of the GFL converters in distributed energy networks. The simulation results offer valuable insights into optimizing network topologies for increased penetration of GFL converters into the power grid.