This example is composed by the 11-bus 4-machine 2-area system, where these two areas are connected via weak tie lines. This test system is ideal for studying dynamic stability, power interchange, oscillation damping, etc.

The system undergoes a three-phase-to-ground fault on Bus 8 at 1s, lasting for 50ms. Simulate the system for 10 seconds. Variables of interest are the ones related to inter-area modes. For example:

which are variables that represent the generator's speed, in per unit. Note that generators 1 and 2 swing together, while swinging against generators 3 and 4. This is due to coherency between the area's group of generators.

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