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Hi Cao, in power transfer analysis, the source system (zone/group of zones or an area/group of areas or a group of buses with generation) would increase their generation as you transfer power. At the same time, the sink or opposing system (zone/group of zones or an area/group of areas or a group of buses with generation) would decrease their generation output. In PSS/E, the source and sink (opposing system) must be defined before the power transfer is conducted.

As the program transfer power from the source to the sink, it also monitors bus voltages depending on how the user provided limits so when the power flow solution is not solving or diverging or when the voltage lower limit is hit by the power transfer, the power transfer solution/simulation stops.