Short-circuit analysis for the 11kV distribution system with the integration of IBDG

The integration of distributed generation (DG) into the distribution grid is increasing with the purpose to improve the power quality and to ensure supply reliability. However, the integration of DG into the grid may significantly influence the resultant fault current in the network. As such, the question arises as to whether the conventional protection settings remain valid with the integration of DG. In addition, the DG can be either a synchronous generator type or the inverterbased type. The different types of DG will further alter the resultant fault current. Consequently, this paper will also conduct a comparative study of the impact to the conventional protection scheme when different types of DG is integrated into the distribution system.