US 8,410,624 B2 · Wind energy installation with variable rotation speed characteristic

Abstract

A wind energy installation including a wind rotor, a doubly-fed asynchronous generator driven by the wind rotor, a converter, and a controller configured to determine an operating torque for an operating rotation-speed, the operating torque not exceeding a maximum torque. The installation also includes a 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. The installation further includes a frequency-dependent rotation-speed limiter configured to interact with the classifier such that a lower limit rotation-speed is increased only at an overfrequency and an upper limit rotation-speed is reduced only at an underfrequency. Accordingly, the operating torque can be adapted with respect to the permissible limit values rather than over the entire operating range, thus minimizing yield losses when frequency discrepancies occur.

Claims7

Dependent claims

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.

5 more elements

Dependencies are inferred from the claim text.

Wind energy installation with variable rotation speed characteristic

Life of this patent

Wind energy installation with variable rotation speed characteristic

Life of this patent

Abstract

Claims7