An under-voltage load shedding scheme to prevent voltage collapse in a microgrid

Abstract

In this paper, an under-voltage load shedding (UVLS) scheme is proposed to prevent voltage collapse in a microgrid (MG). MGs are getting more popular due to their ability to provide electricity in the islanded mode. Advanced strategies are needed to control and protect MGs. The proposed method in this paper uses voltage stability index to rank loads according to their index values. Afterwards, the most effective loads are chosen and disconnected. The proposed method is tested on a MG consisting of a wind turbine (WT), a microturbine (MT), a CHP generator and a photovoltaic (PV) system. All simulations are carried out in the DIgSILENT power factory software.