Control Strategy for Grid Tied Hybrid System with Improved Power Quality, While Switching Between GTM and IAM

Microgrids are like mini power grids that can work independently or tied to the main grid. They use a mix of power sources like solar, BESS, and diesel generators, which can be directly connected to AC bus via inverters (Inverter-Based Resources or IBRs) or units like Diesel Generators (DGs). Microgrids are capable to operate both tied with to the grid and independently. In grid-forming, either the renewable energy source or the Diesel Generator controls the voltage and frequency, while the other manages power flow. To connect back to the main grid, a synchronization process is needed to prevent large power surges. This paper explains how to control the synchronization of a Inverter Based Resources (IBR) with the grid. It explains the operation of a hybrid energy system in both modes. It also shows how to control the Diesel Generator in grid-tied mode and proposes a method for smooth transitions between IAM and GTM. It also describes how a hybrid energy system operates in both modes. The system is validated in MATLAB/Simulink.