A method for feeding electrical power into an electrical supply grid having a grid voltage by means of a wind power installation , wherein the wind power installation comprises - a generator for generating a generator current (I G ), - an active rectifier connected to the generator for rectifying the generator current (I G ) into a rectified current (I DC ), - a direct voltage intermediate circuit connected to the active rectifier and having an intermediate circuit voltage (U ZK ) for receiving the rectified current (I DC ), - a chopper circuit connected to the direct voltage intermediate circuit for diverting excess energy out of the direct voltage intermediate circuit, - an inverter connected to the direct voltage intermediate circuit for generating an infeed current (I Net ) for feeding into the electrical supply grid , wherein - the feed takes place in a voltage-impressing manner, so that the inverter counteracts a deviation of the grid voltage from a voltage setpoint value through an adjustment of the fed current, - the active rectifier has a lower current limit , which in the presence of a change of the grid voltage in its amplitude and/or phase, limits a fall of the rectified current (I DC ) to protect the generator , - wherein the lower current limit of the active rectifier is referred to as rectified current limitation, and is set and changed depending on an operating point of the wind power installation , in particular depending on an operating point of the active rectifier , and - the chopper circuit is controlled in such a way that it diverts excess energy that arises in the direct voltage intermediate circuit as a result of the current limit of the active rectifier , or a portion thereof, out of the direct voltage intermediate circuit. - a generator for generating a generator current (I G ), - an active rectifier connected to the generator for rectifying the generator current (I G ) into a rectified current (I DC ), - a direct voltage intermediate circuit connected to the active rectifier and having an intermediate circuit voltage (U ZK ) for receiving the rectified current (I DC ), - a chopper circuit connected to the direct voltage intermediate circuit for diverting excess energy out of the direct voltage intermediate circuit, - an inverter connected to the direct voltage intermediate circuit for generating an infeed current (I Net ) for feeding into the electrical supply grid , wherein - the feed takes place in a voltage-impressing manner, so that the inverter counteracts a deviation of the grid voltage from a voltage setpoint value through an adjustment of the fed current, - the active rectifier has a lower current limit , which in the presence of a change of the grid voltage in its amplitude and/or phase, limits a fall of the rectified current (I DC ) to protect the generator , - wherein the lower current limit of the active rectifier is referred to as rectified current limitation, and is set and changed depending on an operating point of the wind power installation , in particular depending on an operating point of the active rectifier , and - wherein the lower current limit of the active rectifier is referred to as rectified current limitation, and is set and changed depending on an operating point of the wind power installation , in particular depending on an operating point of the active rectifier , and - the chopper circuit is controlled in such a way that it diverts excess energy that arises in the direct voltage intermediate circuit as a result of the current limit of the active rectifier , or a portion thereof, out of the direct voltage intermediate circuit. <EOS>