Abstract: A method and a wind turbine are provided. The wind turbine includes a gearless generator that is a synchronous generator and includes a stator and a generator rotor. The wind turbine includes a generator filter with modifiable filter properties that is coupled to the stator and configured to filter a stator current. The wind turbine includes a filter controller configured to control the generator filter.

Abstract: A method and a wind turbine are provided. The wind turbine includes a gearless generator that is a synchronous generator and includes a stator and a generator rotor. The wind turbine includes a generator filter with modifiable filter properties that is coupled to the stator and configured to filter a stator current. The wind turbine includes a filter controller configured to control the generator filter.

Abstract: A wind turbine is provided which comprises a rotor comprising at least two rotor blades, an electric generator, which is coupled directly or indirectly to the rotor and generates an electric power, and at least one power electronics unit, which is provided for converting an input voltage with an input frequency into an output voltage with an output frequency. The at least one power electronics unit has at least one varistor unit. The at least one varistor unit has at least one varistor disc with a voltage-dependent resistance and at least one metal disc that is provided in contact with the at least one varistor disc and is a cooling element for cooling the at least one varistor disc.