Fault-ride-through method, converter and power generating unit for a wind turbine

The disclosed fault-ride-through and/or post fault active power recovery control method comprises the following steps: - detecting a voltage dip on a power line (4) transmitting electric power; - reducing the active current and/or active power that is fed by a power generating unit (2) at a feeding point into a power network having a plurality of power lines to a specific value, if a voltage dip is detected on the power line; and - when fault-ride-through is de-activated, the active power from the generating unit or plurality units is ramped back to an optimised post-fault power value which could be the pre-fault active value within a specific optimised time function. The specific value of the active current and/or active power depends from the properties of at least a part of the power network to which the power generating unit (2) is connected, and/or the specific value of the active current and/or active power depends from the number of power generating units (2) connected to the feeding point of the power network.