Unfortunately a DLL built for PSSE cannot be directly imported for use in PowerFactory. You have a couple of options, in ascending order of difficulty/complexity.
- Build the model "from scratch" in PowerFactory using DSL (block diagram approach).
- Get the PSSE source code and convert it into source code suitable for a PowerFactory model (this involves a Fortran to C++ code conversion).
- Write a Fotran to C++ "wrapper" that allows the PSSE Fortran code to be wrapped up in a C++ DLL that PowerFactory can use.
If you do not have the Fortran source code (or the model's block diagrams), then you cannot do any of these three options.