METHOD FOR FEEDING ELECTRICAL POWER INTO AN ELECTRICAL SUPPLY NETWORK BY MEANS OF A WIND ENERGY PLANT IN A MANNER WHICH CONTROLS VOLTAGE

The invention relates to a method for feeding electrical power into an electrical supply network (212) having a grid voltage by means of a wind energy installation (100), and the wind energy installation (100) comprises a generator (201) for generating a generator current (I), an active rectifier (202) connected to the generator (201) for rectifying the generator current (I) into a rectified current (I), a DC link circuit (204) connected to the active rectifier (202) and having an intermediate circuit voltage (U) for receiving the rectified current (I), a chopper circuit (208) connected to the DC link circuit (204) in order to remove excess energy from the DC link circuit, an inverter (210) connected to the DC link circuit (204) for generating a feed-in current (I) for feeding into the electrical supply network (212), wherein the feeding in takes place in a voltage-forming manner, so that the inverter (210) counteracts a deviation of the grid voltage from a voltage setpoint by an adjustment of the fed-in current, the active rectifier (202) has a lower current limitation in order to limit a drop in the rectified current (I) upon a change in the grid voltage in amplitude and/or phase position for protection of the generator (201), wherein the current limitation of the active rectifier (202) is referred to as rectified current limitation and is set and changed depending on an operating point of the wind energy installation (100), in particular depending on an operating point of the active rectifier (202), and the chopper circuit (208) is controlled such that it removes excess energy that occurs in the DC link circuit (204) due to the current limitation of the active rectifier (202), or a part thereof, from the DC link circuit.