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In my very hypothetical scenario, I'm simulating the IEEE 9 bus system, whose loads I am deliberately increasing linearly with time in order to make the system 'blow up'. Some unrealistic modifications I have done to this systems are:

• Disabled all protection mechanisms (didn't put any such mechanisms would be a more accurate statement)
• Generator maximum allowed powers and operation voltage ranges have been drastically increased (no chance of hitting the limits during the simulation).
• Used zero time lag governors which can sense any change in load powers and instantly increase the real power generation of the generators.
  • Additional power lost in the transmission lines due to extra loading has also been accommodated for in these power increments.

Yet after all this, once my generator bus voltages dip below some critical values, say between 0.80pu to 0.75pu, the simulation eventually 'blows up', and the bus voltages start drastically oscillating.

I was hoping for a result in which the generator bus voltages dip until they reach 0pu (or close to zero). So physically what goes on which causes my system to 'blow up'?