Potential Negative Impact on Reliability of Distributed Generation under Temporary Faults

Abstract

This paper uncovers potential negative impacts on the SAIFI reliability index produced by the installation of Distributed Generation (DG) in distribution networks when subjected to temporary faults. Detailed network modeling produces accurate time-domain simulations which show how the negative effects on reliability index occur. The problem is caused by fuse opening due to the wrong location of the DG and unsuitable relay settings. A 4 kV urban distribution system is chosen for the analysis. Over 50% of the possible locations where DG can be installed in the network under study yield reduce reliability.