Method for feeding electrical power into an electrical power supply network

A wind power installation for feeding electrical power into a three-phase electrical power supply network at a network connection point, the wind power installation comprising:

• an inverter for generating an infeed current,
• a voltmeter for detecting an electrical network voltage at the network connection point, and
• a controller for controlling feeding electric power into a three-phase electrical power supply network at a network connection point, wherein the controller is configured to:
• determine a virtual generator voltage using a machine model that emulates a behavior of a synchronous machine,
• prepare the detected network voltage for comparison with the virtual generator voltage, and
• define a setpoint current as predefinition for the infeed current as a function of the virtual generator voltage and as a function of the network voltage prepared for comparison,
• wherein the inverter is prepared to generate the infeed current depending on the setpoint current and to feed the generated infeed current at the network connection point into the electrical power supply network, and
• wherein preparing the detected network voltage for comparison with the virtual generator voltage comprises transforming the detected network voltage into a space vector representation.