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Performing activity TYSL prior to initialising the dynamic simulation is optional, but recommended since it will solve the load flow too a small tolerance giving very small mismatch at all buses. The starting load flow conditions are thereby close to perfect steady state.

I recommend to read Chapter 14.2.3 in Program Operation Gudie, Volume II. You will not learn PSSE by reading the API manual only!!! The API manual only describes how to call the API and is not describing the actual activity.