Method for controlling a generator of a wind turbine

A controller for a wind turbine having at least one generator including a stator with a rotational axis about which a rotor is mounted, and the stator being electrically connected to an active rectifier actuated using an actuator, the controller comprising:

• a position circuit configured to determine a mechanical position of the rotor with respect to the stator and output an electrical position signal,
• a transformation circuit configured to predefine DC components of rotor fixed d and q coordinates for at least one three-phase stator current, and
• a damping circuit configured to modulate and/or add at least one AC component to a q coordinate and/or modulate and/or add at least one DC component to a d component, wherein:
• the AC component is determined based on the electrical position signal and/or the DC component is determined based on the electrical position signal, and
• the damping circuit is connected to the transformation circuit,
• at least one modulated q coordinate is generated which has the DC component and the AC component and is output to the actuator made available for the actuator, and/or at least one changed d coordinate is generated which has the DC component and the AC component and is output to the actuator.

A wind turbine, comprising:

• a generator including a stator with a rotational axis and a rotor mounted about the rotational axis, wherein the stator is electrically connected to an active rectifier, and
• an actuator for the active rectifier, wherein
• the generator includes two stators that are phase shifted by 30° and each connected to a three-phase module of the active rectifier, and
• the actuation unit is configured to:
• perform a first reverse transformation of a first modulated q coordinate and a d coordinate and of a first electrical position signal for the first three-phase module of the active rectifier, and
• perform a second reverse transformation of a second modulated q coordinate and of the d coordinate and of a second electrical position signal for the second three-phase module of the active rectifier, wherein the second modulated q coordinate is phase shifted by 180° with respect to the first modulated q coordinate, and the second electrical position signal is phase shifted by 30° with respect to the first electrical position signal, and/or
• the actuation unit is configured to:
• perform a first reverse transformation of a first changed d coordinate and of a q coordinate and of a first electrical position signal for the first three-phase module of the active rectifier, and
• a second reverse transformation of a second changed d coordinate and of the d coordinate and of a second electrical position signal for the second three-phase module of the active rectifier, wherein the second changed d coordinate is phase shifted by 180° with respect to the first changed d coordinate, and the second electrical position signal is phase shifted by 30° with respect to the first electrical position signal.