NEM Inter-Area Modes Dependencies

Inter-area modes refer to the oscillatory behaviour of power system dynamics that involves interactions between different regions or areas of a grid. These inter-area oscillations typically occur at low frequencies around 1-5 rad/s and can cause power system instability if the damping of a mode is inadequate. A consequence of insufficient damping is the need for operational limits on power transfers across regions that can be well below other stability limits (thermal, voltage and transient).