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This paper presents a study on the modeling of a D-STATCOM (Distribution Static Compensator) used for mitigating voltage sag on a distribution network. The power circuits of the D-STATCOM and the distribution network are modeled by specific blocks from the Power System Block set while the control system is modeled by Simulink blocks. A main feeder feeding a 10 MW load is abruptly disturbed by the inclusion of a sudden load of 10 MW thereby creating voltage sag. This voltage sag is corrected by the static compensator.