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1: The signal Pmwset is the third VAR in model LCFB1. You can change the value with API plmod_var: Example, update Pmwset for generator 1 at bus 206. Here I change the value to 0.03.

psspy.change_plmod_var(206,'1',r"""LCFB1""",3, 0.03)

2: Yes, the Pref output from LCFB1 is updating the power reference in model TGOV1.

1: The EDIT: It seems that signal Pmwset cannot be changed during simulation since there is no corresponding VAR. Signal Pref0 is the third VAR in model LCFB1. You can change the that value with API plmod_var: Example, update Pmwset Pref0 for generator 1 at bus 206. Here I change the value to 0.03.

psspy.change_plmod_var(206,'1',r"""LCFB1""",3, 0.03)

A question here is how Pmwset is stored in the model without using a VAR????

2: Yes, the Pref output from LCFB1 is updating the power reference in model TGOV1.