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You can have two transmission lines between infinite bus and POI. Simulate trip of one branch. The new load flow will change the bus angle at POI.

Do not use playback model in this simulation, use GENCLS instead.

You can have two transmission lines between infinite bus and POI. Simulate trip of one branch. The new load flow will change the bus angle at POI.

Do not use playback model in this simulation, use GENCLS instead.

EDIT:

A better alternative is to have a transformer between infinite bus and POI. Change the transformer phase shift during simulation to emulate a voltage angle phase shift. In this way you can select the wanted angle shift, e.g. 5 deg, 10 deg , 15 deg etc.