Changing Base Frequency in PSSE

Many train electric system used to operate at 16 Hz. At our shop, to perform system frequency scan studies (looking for network resonance) we prepare network models from 1 Hz to 120 Hz.

Changing the base frequency option will not change or update the network parameters. You will still have the same reactance and admittance since PSSE is using pu data. The only way to model another frequencies is to recalculate all data with Python or Iplan.

Base frequency is just an information to the user about which frequency has been used to calculate X and B. If base frequency is properly set the line charging is shown in microFarad when ohm option is used. Frequency scanning studies cannot be performed by changing the base frequency only.

perolofl, you are correct. I want to clarify that a new case is prepared scaling all impedances in the network model to the target frequency using a python script. Most of PSSe activities (load flow, reporting) can be used at any frequency.