Provided is a method for feeding electrical power into an electrical supply grid having a grid voltage by a wind power installation. The installation comprises a generator for generating a generator current, an active rectifier for rectifying the generator current into a rectified current, a direct voltage intermediate circuit having an intermediate circuit voltage for receiving the rectified current, a chopper circuit for diverting excess energy out of the direct voltage intermediate circuit, and an inverter for generating an infeed current for feeding into the electrical supply grid. 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 to limit a fall of the rectified current to protect the generator during a change of the grid voltage amplitude or phase.