Patent ID: 8410624

Claim:
A wind energy installation, comprising: a wind rotor; a doubly-fed asynchronous generator driven by the wind rotor; a converter, the generator configured to interact with the converter; a controller comprising a frequency-adaptive torque limiter and a frequency-dependent rotation-speed limiter, the controller configured to determine an operating torque for an operating rotation-speed, the operating torque not exceeding a maximum torque; and signal lines connecting the controller with the rotor, the generator, and the converter such that the controller controls the rotor, the generator, and the converter, the frequency-adaptive torque limiter having a classifier for an overfrequency or underfrequency, a torque shifter configured to reduce the maximum torque in the event of frequency discrepancies, and an inhibitor configured to block the torque shift at an underfrequency, and the frequency-dependent rotation-speed limiter configured to interact with the classifier such that the frequency-dependent rotation-speed limiter increases a lower limit rotation-speed of the rotor via the signal lines only at an overfrequency and reduces an upper limit rotation-speed of the rotor via the signal lines only at an underfrequency.