Simulation interruption and pole migration during D-LAA attacks

[federicagiannunzio]

Hello everyone, I am opening this discussion to confirm a technical point regarding simulation behavior in ANDES when a system becomes unstable.

I am currently simulating Dynamic Load Altering Attacks (D-LAA) on power grids: when a severe D-LAA is performed, the system loses stability, causing the poles (eigenvalues) to migrate into the right-half plane (RHP). When I run these attack scenarios, the simulation typically interrupts/crashes. By plotting the eigenvalues at the point of failure, I can see that some poles have indeed moved into the RHP.

Could someone confirm if the simulation interruption in ANDES is the expected behavior when the system reaches such instability? I want to ensure that this "crash" is a direct numerical consequence of the system's divergence rather than an unrelated integration error.

As a side note, thank you very much for the support you provided on my previous questions!

Thank you in advance,
Federica