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Hey, Not sure if the issue I am seeing is due to resonance or something else however when running a frequency sweep on a model (change the impedance in each solution in order to study a different frequency) when approaching a resonance it appears that PSSE takes a busses voltage to 0pu at some point. I have actually tried this with a few different powerflow programs, pandapower and even powerworld and they all seem to have the same issue (not sure if it is an issue or simply core to how the Power Flow solution works).

The system is simply a 2 bus system with a slack at 1pu voltage. A single line of R,X pu of 0.0833,0.311000 at 50Hz (0.0833,3.732@600Hz). And a single fixed shunt 1.5Mvar at 50Hz(18 @600Hz) Like So.

Any information on this would be appreciated, can't upload files yet otherwise I would put up the raw files.

Cheers,

Anthony