Effect of Renewable Distributed Generators on the Fault Current Level of the Power Distribution Systems

Abstract

Abstract. The presence of renewable distributed generator (RDG) in a distribution system will have unfavorable impact on the operating system because the distribution system is no longer radial in nature and is not supplied by a single main power source. With RDGs in a distribution network, it brings about a change in the fault current level of the system and causes many problems in the protection system, such as false tripping of protective devices, protection blinding, an increase and decrease in short-circuit levels. This paper presents the effect of RDGs on the fault current level of the system. The operating protection issues particularly in cases where RDGs are added to a LV distribution feeder are also discussed.

A review of adaptive overcurrent protection in distribution networks with integration of distributed energy resources

“…The contribution of Inverter Based Distributed Generation (IBDG) to the system's fault current level is the lowest [33]. The integration of DER cause the increase in equivalent impedance of the network, which result decrease in the fault current level [36][37][38][39][40][41].…”