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The simulation of incremental power transfers is done with multiple simulation runs. For an initial generators output (P1), a load flow is solved and prepared for a dynamic run, add dyr file, perform the dynamic run and test for the rotor angle stability limit. Increment the generator output to P2 (P2 = P1+ delta) and solved the load flow for a dynamic run, add dyr file , perform a second dynamic run and test for the rotor angle stability limit. Repeat this process as many times as needed until you reach the maximum output of the generators, the case does not converge or the simulation shows a stability limit or crashes. Delta is chosen accordingly so you iterate no more than 10 times (my preference). All these activities can be embedded in a python loop to automate the solution.

Changing generation output within a dynamic simulation (unless is part of a switching event) is not recommended because it creates a numerical instability within the integration process. Same logic applies to load. Once a simulation starts, the trajectory that the variables follows (power output, v, f, etc.) and outcomes like no-convergence (signaling reaching a limit) should be left to the natural models response.