Sensitivity Analysis of Voltage Sag Based Fault Location With Distributed Generation

The presence of distributed generation (DG) in distribution networks may seriously affect accuracy of the voltage sag based fault location method. An approach toward quantifying the adverse effect of DG on the fault location calculation is described. A series of realistic scenarios is used to illustrate how DG impacts synchrophasor measurements during disturbances. Alternative Transients Program-Electromagnetic Transients Program models are used to obtain steady-state solutions in the time domain, while Sobol´s approach to sensitivity analysis is used to quantify the effect of DG and imperfections of measuring instruments on fault location. Various test cases reveal that DG may adversely affect the voltage characteristic and therefore the accuracy of voltage sag based fault location.