Evaluation of protection coordination violations with the integration of distributed generators

Conventional distribution system is generally passive having a unidirectional power flow from its grid substation to the loads. With the addition of Distributed Generation (DG) in to the system, power flow becomes bidirectional and fault current increases. These can influence the existing protection schemes, which are originally designed for passive networks. This paper proposes a technique, which can be used to assess the protection coordination loss quantitatively, for a DG integrated network allowing the utility to take corrective measures.