Power system stability may be defined as the property to remain in a state of equilibrium under normal condition and to regain an acceptable state of equilibrium after a disturbance occurs. Instability may occur in many different ways depending on the system configuration and operating mode. Traditionally the stability problem is related to maintaining synchronous operation. In particular "transient stability" is the ability of the power system to maintain synchronism when subjected to a severe transient disturbance. The system response involves large excursion of generator rotor angles. Usually the system is altered so that the post-disturbance steady-state operation differs from that prior to the disturbance.
The " Dynamic Analysis" module included in Neplan permits to investigate any kind of electro-mechanical transients.