Simulation model of a protection scheme for active distribution networks

Abstract

The growing trend of installed power from Distributed Generators (DG) in distribution networks is giving rise to new issues in grid operations. In particular, the interaction between DG and grid protections can cause nuisance trips, unwanted island operations and, in general, worsening of power quality. The paper discusses a possible protection scheme suited for active networks and implementing logic selectivity. The proposed approach is based on directional protections coordinated through communications. Simulation models of an urban Medium Voltage (MV) distribution grid, of distributed generators and of the employed types of protections have been developed in the DIgSILENT Power Factory environment. Digital simulations confirms the effectiveness of the proposed approach.