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You can use PSSE's short-circuit calculation procedures to get the sequence components of voltage and current due to an unbalanced fault. However, this is a "static" calculation, calculating the sequence components at one instance in time, immediately after the fault. It sounds like you want to do a dynamic simulation, and calculate the sequence components as a function of time, let's say in the 1s following the occurrence of the fault. This is not possible in PSSE dynamics, which considers the positive sequence only. There are other software packages that do provide such a calculation function, but I am wary of mentioning any names here to prevent any accusation of bias.