A method for controlling a wind turbine connected to a three-phase electric power grid during an asymmetric grid fault, wherein the wind turbine comprises a doubly-fed asynchronous generator, whose rotor is connected to the electric power grid via an AC converter and whose stator is connected to the electric power grid, wherein the AC converter comprises a rotor side converter, a grid side converter and a control device provided with a characteristic curve which indicates, for an actual value of the grid voltage in a negative-sequence system, a desired value for a reactive current to be fed in the negative system, characterised by the following steps: • measuring the actual values of the grid voltage in at least two phases, • transforming the measured actual values of the grid voltage into an actual value of the grid voltage in the negative-sequence system, • determining a desired value for a reactive current in the negative system to be fed into the power grid, based on the provided characteristic curve and on the actual value of the grid voltage in the negative-sequence system, • subdividing the determined desired value for the reactive current in the negative system to be fed into the power distribution network to the rotor side and the grid side converters (30, 32) by determining a desired value for a reactive current component to be provided by the rotor side converter and a desired value for a reactive current component to be provided by the grid side converter according to a subdivision rule provided in the control device, and • controlling the rotor side converter and the grid side converter to feed reactive current corresponding to the subdivided desired values (43, 46), characterised in that • the desired value for the reactive current component to be provided by the rotor side converter is limited to a pre-defined maximum value, • when subdividing the desired value for the reactive current in the negative system to be fed below the pre-defined maximum value, a smaller desired value component is set for the grid side converter with respect to the desired value for the reactive current component to be provided by the rotor side converter, • a measured actual value for an electric rotor quantity is compared with a pre-defined threshold value for the electric rotor quantity, and if it is determined that the actual value of the electric rotor quantity is greater than the pre-defined threshold value for the electric rotor quantity, the subdivision of the desired value for the reactive current in the negative system to be fed into the power grid is performed such that the desired value for the reactive current component to be provided by the rotor side converter above the predefined threshold value is increased to a lesser degree than below the pre-defined threshold value. • measuring the actual values of the grid voltage in at least two phases, • transforming the measured actual values of the grid voltage into an actual value of the grid voltage in the negative-sequence system, • determining a desired value for a reactive current in the negative system to be fed into the power grid, based on the provided characteristic curve and on the actual value of the grid voltage in the negative-sequence system, • subdividing the determined desired value for the reactive current in the negative system to be fed into the power distribution network to the rotor side and the grid side converters (30, 32) by determining a desired value for a reactive current component to be provided by the rotor side converter and a desired value for a reactive current component to be provided by the grid side converter according to a subdivision rule provided in the control device, and • controlling the rotor side converter and the grid side converter to feed reactive current corresponding to the subdivided desired values (43, 46), • the desired value for the reactive current component to be provided by the rotor side converter is limited to a pre-defined maximum value, • when subdividing the desired value for the reactive current in the negative system to be fed below the pre-defined maximum value, a smaller desired value component is set for the grid side converter with respect to the desired value for the reactive current component to be provided by the rotor side converter, • a measured actual value for an electric rotor quantity is compared with a pre-defined threshold value for the electric rotor quantity, and if it is determined that the actual value of the electric rotor quantity is greater than the pre-defined threshold value for the electric rotor quantity, the subdivision of the desired value for the reactive current in the negative system to be fed into the power grid is performed such that the desired value for the reactive current component to be provided by the rotor side converter above the predefined threshold value is increased to a lesser degree than below the pre-defined threshold value.