Patent ID: 7960849

Claim:
Control method of the converter ( 22 ) of an electricity generation facility of the type which comprise at least one electric generator ( 1 ), such as a wind generator, connected to an electricity network ( 8 ), in the presence of voltage sags in said network, the electric generator being a double-fed asynchronous generator ( 11 ) formed by two windings, a winding in the stator, directly connected to the network, and a winding in the rotor ( 13 ) which is fed on normal regime, in controlled form, by said converter which imposes on it a predetermined voltage current called setpoint current ( 4 b ); characterized in that, in the event of a voltage sag occurring, the converter imposes a new setpoint current ( 4 b ′) which is the result of adding to the previous setpoint current a new term, called demagnetizing current ( 4 c ), which generates a flow in the rotor winding opposed to the free flow, the free flow ψ sl being that which is not caused by the direct component of the stator voltage, consequently reducing the voltage in converter connectors.