Wind turbine with power-dependent filter device

A method of configuring a choke coil for use in a filter device, comprising:

• generating, by a multiphase generator of a wind turbine, electric power, wherein the generator generates a multiphase generator current and wherein the generator has a generator output configured to output of the generator current;
• generating, by a filter device coupled to the generator output, a filter current for influencing the generator current wherein the filter current is dependent on the generated electric power of the generator;
• influencing, by at least one capacitor of the filter device, the filter current;
• and
• influencing, by a choke coil of the filter device coupled in series upstream of the at least one capacitor, the filter current, wherein:
• the choke coil has a saturation current value indicative of an amplitude of the filter current, at which the choke coil has a magnetic saturation state, and
• the choke coil is configured such that the saturation current value is less than a predetermined filter nominal current of the filter device.

A method of converting a wind turbine by retrofitting a filter device, comprising:

• replacing the filter device or a part of the filter device by a modified filter device or a part of the modified filter device such that the wind turbine includes the modified filter device after the replacement, wherein the wind turbine includes:
• a multiphase generator configured to generate electric power, wherein the generator generates a multiphase generator current and the generator has a generator output for outputting the generator current,
• a filter device, coupled to the generator output, configured to generate a filter current for influencing the generator current and reducing electric oscillations of the generator current, wherein the filter current is dependent on the generated electric power of the generator,
• wherein the modified filter device includes:
• at least one capacitor for influencing the filter current;
• and
• a choke coil connected in series upstream of the at least one capacitor for influencing the filter current, wherein the choke coil has a saturation current value indicative of an amplitude of the filter current, at which the choke coil has a magnetic saturation state, and wherein the saturation current value is less than a predetermined filter nominal current of the filter device.