Fault Analysis on Tomia Island Microgrid Using PSLF

Photovoltaic (PV) power plant produces electricity by converting solar irradiance to electrical energy. Because PV power plants produce electricity based on sunlight, it lacks stored energy or inertia. Hence the connection of a PV power plant to the grid will reduce the total inertia of the grid. Because it uses medium voltages of 20 kV, Tomia Island microgrid characteristics differ from those of other microgrids. Furthermore, the microgrid is powered by a diesel generator (DG) with a capacity of 2.5 MW and four distributed PV power plants to assist the utility grid in providing 24 hours of electricity while lowering the operation cost of a diesel generator. As a result, studying the stability and reliability of a Tomia Island microgrid due to fault is extremely beneficial in developing the microgrid. The analysis was conducted using PSLF, where a line fault and load trip were applied to the system by varying the DG’s size and PVs terminal voltage. It can be concluded that the microgrid has frequency stability. The high voltage current reactive management value setting, on the other hand, causes the PV to overvoltage, which will cause the PV to be disconnected because the overvoltage lasted longer than allowed. For the PVs to remain connected to the microgrid even after a fault, the terminal voltage of the PV must be set to 1.1 p.u., and the minimum DG capacity is 1.8 MW.