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Hello. I am trying to simulate multiple line outages of a power system using psspy. There are cases when the system will form two islands. When this happens, one of the islands will not have a swing bus and I, of course, get the error that there are buses in an island without a swing bus. I have tried to change one of the buses in the non-swing bus island to be of type 3 after the outages using

ierr = psspy.busdata4(30,1,intgar1 = 1, intgar2 = 1)

but I am getting the error

FATAL: Bus 30 [BUS 30 33.000] does not belong to a substation (000568)

I feel like there must be a standard way to handle this type of situation where multiple islands form. Can someone please assist me?

Thank you!