How do I resolve unsteady initial conditions in models?
After initializing, PSLF prints a message indicating the number of models with unsteady initial conditions. The program checks all state variable derivatives against a default tolerance of 0.001. This is a very tight tolerance, and it is very common to see a message that several hundred models initialized with unsteady initial conditions. To determine which models have unsteady conditions and the magnitude of the errors, run the EPCL program usteady.p. Note that you must have an epslf subdirectory under your working directory to use this program. This program lists all models with derivatives greater than a specified tolerance. Check these models for bad data (such as bad limits or an incorrect MVA base) and initial operating conditions (such as a very high terminal voltage or generation above rating) in the powerflow.
