Protection settings optimization in distributed generation system

This paper deals with protection problems in distributed generation systems, it summarizes the protection methods known so far, and it proposes a new protection scheme usable for these systems. First, brief comparison of protection concepts of classical and distributed generation systems based on overcurrent protections is performed, and individual differences in protection settings are discussed. New setting algorithm, based on optimization of appropriately designed objective function, and adaptive directional overcurrent protections with inverse-time characteristics, is performed. Next, validation of proposed optimized setting in SimPoruchy 2.1 program was performed. The software allows for quick and well-arranged output of failure currents in the system and also for simulation of directional protections with inverse-time characteristics used in the model.