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If you are purely after rotor angle stability then monitoring angle spread would probably be your best option, which corresponds to your (1). The easiest way to approach this would be using the SYSANG model .
Alternatively, you may also make use of OSSCAN model (monitoring only), which scans for out-of-step conditions. However you would need to parse PSS/E progress printing for out-of-step messages.
If you are purely after rotor angle stability then monitoring angle spread would probably be your best option, which corresponds to your (1). The easiest way to approach this would be using the SYSANG model .
Alternatively, you may also make can use the following criterion: relative angle swing of OSSCAN model (monitoring only), which scans for out-of-step conditions. However you would need to parse PSS/E progress printing for out-of-step messages.every machine <= 160-180 deg.