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PSSE is a tool for conducting power systems analysis at the fundamental frequency, usually 50Hz or 60Hz.
It seems that you are looking to do a frequency scan, which is typically part of a harmonics analysis study. Adjusting the base frequency and doing several calculations in PSSE will give you a frequency scan, but it will not be a very accurate one since it will not take into account the distributed parameter nature of overhead lines and cables.
If you want to do harmonics analysis then I suggest that you use a different software package.