Test method for testing the behavior of a wind farm in response to an underfrequency event

A test method for testing a behavior of a wind farm in response to a frequency event, the wind farm having a plurality of wind power installations that respectively feed electrical power into an electrical supply grid, each wind power installation of the plurality of wind power installations has a rotor with one or more rotor blades and generates respective wind power from wind and feeds the respective wind power into the electrical supply grid, which a grid voltage and a grid frequency, the test method comprising:

• temporarily changing a respective fed-in power of a respective frequency mode of each wind power installation of the plurality of wind power installations based on the grid frequency when the frequency event occurs;
• changing the respective frequency mode of each wind power installation of the plurality of wind power installations in a farm test mode for testing the behavior of the wind farm in the frequency event;
• and
• testing frequency modes of the plurality of wind power installations, at the same time to test the behavior of the wind farm in this way, wherein the frequency modes each have a respective test frequency function that emulates the frequency event, and testing the frequency modes is coordinated using test frequency values of a test frequency profile transmitted to the plurality of wind power installations to emulate the same grid frequency profile for the plurality of wind power installations.

A wind farm operative to perform a test method for testing a behavior of the wind farm in response to a frequency event, comprising:

• a plurality of wind power installations, each wind power installation of the plurality of wind power installations including:
• a rotor with one or more rotor blades and generating wind power from wind, wherein:
• each wind power installation of the plurality of wind power installations feeds the wind power into an electrical supply grid that has a grid voltage and a grid frequency,
• each wind power installation of the plurality of wind power installations has a respective frequency mode for temporarily changing fed-in power depending on the grid frequency when a frequency event occurs,
• each wind power installation of the plurality of wind power installations is operative to change the respective frequency mode in a farm test mode for testing the behavior of the wind farm in case of the frequency event,
• frequency modes of the plurality wind power installations are tested at the same time,
• the frequency modes each use a respective test frequency function which emulates the frequency event,
• the plurality of wind power installations receive a common start signal simultaneously,
• an identical test frequency function is configured for the plurality wind power installations, and
• test frequency values of a test frequency profile are transmitted to the plurality of wind power installations to emulate the same grid frequency profile for the plurality of wind power installations.

A wind power installation, comprising:

• a rotor having one or more rotor blades to generate wind power from wind and to feed the wind power into an electrical supply grid, wherein the electrical supply grid has a grid voltage and a grid frequency, and the wind power installation has a frequency mode which temporarily changes the fed-in power based on the grid frequency when a frequency event occurs, wherein the wind power installation is configured to:
• receive a start signal;
• in response to receiving the start signal, use a predetermined test frequency function as an emulated grid frequency to test the frequency mode;
• and
• to receive test frequency values of a test frequency profile to emulate a grid frequency profile based on the test frequency values.