Solar and wind generation systems, called distributed generation systems (DGs), are connected to the main power grid using inverters. These DGs create a microgrid, which can work with the main grid or in islanded mode. When the microgrid is in islanded mode, its voltage and phase angle can differ from the main grid’s. When the main grid is restored and connected to the microgrid, these voltage differences can cause a sudden high transient current. This work introduces a super twisting sliding mode control-based pre-synchronisation control system to reconnect the microgrid to the main grid smoothly, when main grid is restored. The control strategy is capable of a smooth transition from islanding mode to grid-connected mode without any high transient currents. In this regard, a parallel inverter-based microgrid architecture incorporating a photovoltaic and battery storage system is adopted to implement the proposed strategy. The control strategy effectively facilitates the stabilised operation of both parallel inverters while ensuring an appropriate power-sharing mechanism. The results suggest effective performance of the proposed pre-synchronisation strategy with no transient current and voltage deviations experienced when the microgrid is reconnected to the grid.