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Assumptions, control law and data source
Why the blades stop speeding up in strong wind. Below the rated wind speed a real turbine holds a constant tip-speed ratio, so rotor rpm rises in step with wind speed. Once the generator reaches its rated power the blades pitch to shed the excess wind: the rotor keeps turning at a constant speed while the extra energy is deliberately not harvested. Above the cut-out speed the machine feathers and parks. That is why a 12 m/s breeze and a 20 m/s storm look identical in blade speed — the difference shows up in the state badge and the power figure.