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A couple of questions: 1. Did you use a PLBVFU1 model at the system slack to perform the voltage step test? 2. Was your generator connected to an excitation system?
When I perform step response tests, I use PLBVFU1 model for the system slack bus and provide step input playback signals (e.g., voltage and frequency). I will let the generator and plant control models respond and from there do the necessary parameter adjustments in order to obtain the desired response and output levels.
