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My idea here is that, i will run a short-circuit analysis for the system under study using a different program and will get the single phase short circuit MVA values. I will compute for the pu impedance associated with the short circuit MVA value and apply it as a fault impedance in the PSSE dynamic simulation to emulate unbalanced disturbance.

May i know if someone here in the group did the same way? Otherwise, can you share your ways on modeling unbalanced faults in PSSE positive sequence dynamic simulation? Thanks.