*3.5. Supervisory Control Event Examples*

Figure 6 shows four examples of events and stop maneuvers using the DTU 10 MW RWT in turbulent wind simulations. In Figure 6a, a collective pitch-to-fine fault at a simulation time of 125 s leads to the triggering of the first and second over-speed alarms. The resulting maneuvers (normal and emergency stop) can be distinguished by the different pitch rates. Figure 6b shows a single pitch-to-fine event during power production using the IPC strategy. At 120 s of simulation time, *θ*<sup>1</sup> receives a faulty signal and starts pitching towards 0◦. This is caught by the supervisory controller and the normal stop procedure is triggered. The normal stop feature that minimizes aerodynamic imbalances can be clearly seen in this figure, as the difference in individual pitch angles is reduced to 0◦ at 130 s of simulation time. Figure 6c shows a grid loss scenario and the resulting stop maneuver. Finally, Figure 6d shows a speed transducer fault at 120 s simulation time. As a consequence, the generator torque and pitch angle signals freeze and a normal stop is only triggered because of the first over-power alarm (comparable to the first over-speed threshold).

**Figure 6.** Events triggered by the controller: (**a**) Collective pitch-to-fine; (**b**) Individual pitch-to-fine; (**c**) Grid loss; (**d**) Speed transducer fault. In all cases, the event is captured by the supervisory controller and an appropriate stop maneuver is triggered.
