Dynamic electric brake for a variable speed wind turbine having an exciter machine and a power converter not connected to the grid

A variable speed wind turbine comprising:

• a rotor including at least one blade;
• a drive train coupled to the rotor, the drive train including at least a doubly fed induction generator (DFIG), said DFIG having at least a stator connectable to a power grid,
• at least an exciter machine coupled to the drive train;
• and
• at least a power conversion device isolated from the grid and electrically coupled to a rotor of the doubly fed induction generator and to the exciter machine to transfer electrical power between the rotor and the exciter machine;
• and
• an electric braking circuit placed in the power conversion device between the rotor and the exciter machine.