Rahman Dashti

Background: With the expansion of renewable energy sources and the increased deployment of microgrids in modern power systems, the need for coordinated and secure connection of these units to other grids is becoming increasingly important. Due to differences in voltage, frequency, and phase angle parameters, this connection requires a precise synchronization process to prevent instability, inrush currents, and equipment damage. Therefore, designing and implementing effective control strategies can play a crucial role in improving the synchronization process. Aim: This study aims to design and evaluate an effective control strategy for the pre-synchronization of a microgrid with an AC grid, ensuring a safe connection with minimal transient oscillations and inrush current. Methodology: To achieve this goal, a simulation model was developed in Matlab٫Simulink, consisting of a microgrid with a PV source and a larger grid with a diesel generator. Two different controllers, Fuzzy Logic Control (FLC) and Finite Set Model Predictive Control (FS-MPC), were designed, and their performance in pre-synchronization was analyzed and compared using a control selection switch. Conclusions: The FS-MPC-based pre-synchronization control, leveraging a multi- objective cost function and current regulation, demonstrated superior performance over FLC and can be proposed as an efficient solution for secure and stable connection of microgrids to other grids.