Load shedding scheme based on voltage instability index using synchrophasor data

This paper presents load shedding scheme based on voltage instability index to prevent voltage collapse. For assessing effective of method, the scheme requires reliable voltage instability indicator which can evaluate the dynamic behaviors in system voltage stability for deciding the necessary control action. Hence, synchrophasor data using Phasor Measurement Units (PMUs) are used in calculation process of the proposed voltage instability index. This paper provides strategy to disconnect sufficient amount of load by successive steps of specific value. The proposed scheme is investigated and examined on two-area smart grid test system using DIgSILENT Powerfactory software. The simulation results show the performance of proposed load shedding scheme dealing with voltage instability as well as voltage collapse.