Variable impedance device for a wind turbine

A wind turbine comprising:

• a housing;
• an asynchronous generator configured to be electrically connected to a connection to a power grid and generate a current;
• a power converter circuit configured to be electrically connected to the asynchronous generator and convert the current;
• means for varying impedance to limit the converted current in response to a transient current, said asynchronous generator, said power converter circuit and said means for varying impedance disposed in the housing.

A method for controlling current in a wind turbine, the method comprising:

• generating a current using an asynchronous generator disposed in a housing of the wind turbine;
• converting the current using a power converter circuit disposed in the housing;
• limiting the converted current in response to a transient current in a power grid by varying impedance of a variable impedance device disposed in the housing and electrically
• connected to the asynchronous generator;
• and
• outputting the limited current to a connection to the power grid.