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The response of GGOV1 seems ok. With a dead band of 0.1 Hz the model will only sense a frequency deviation of 0.5 - 0.1 = 0.4 Hz. Hence, the droop response is about 80% of the response without dead band.
When the frequency is ramped back to 50 Hz again, the regulator stops the control when the frequency error is below 0.1 Hz, due to the dead band. The turbine output is therefore "stuck" at a level above the original power at start of simulation. That's why the red curve doesn't go back to 54 MW at the end of the simulation. That level correspond to the droop and 0.1 Hz frequency error.
