Prevention of islanding in grid connected PV system using twelve pulse line commutated converter

One of the major drawback of connecting PV systems to the grid is unintentional islanding condition. Islanding can be dangerous for utility workers and damage utility equipment so anti islanding is a crucial subject for grid connected PV systems. For this reason inverter in the PV system must detect islanding and stop supplying power if the grid is down. In this paper 12 pulse LCC is used in inversion mode for the grid connection of PV system. A 12 pulse LCC converter needs commutating voltage of grid to operate. The LCC do not require maintaining synchronism between grid and converter and having an ability to suppress all harmonics below 11
^th
order. The simulation results is carried out in Matlab/Simulink shows feasibility of proposed solution.