Method for controlling a wind farm

A wind power system, comprising:

• a closed control circuit configured to provide damping control for damping low-frequency oscillations, wherein the wind power system is configured to:
• feed electrical power generated from wind into an electrical supply grid;
• and
• damp the low-frequency oscillations in the electrical supply grid, wherein the electrical supply grid has a line voltage with a nominal line frequency, and the low-frequency oscillations have a lower frequency than half the nominal line frequency;
• and
• a wind system controller configured to control the feeding of the electrical power into the electrical supply grid, wherein the damping control for damping the low-frequency oscillations controls the feeding of the electrical power into the electrical supply grid using the wind system control, and wherein closed control circuit includes:
• at least a portion of the electrical supply grid;
• at least a portion of the wind power system;
• and
• at least a portion of the wind system control,
• wherein the damping control is configured to mitigate weakly-damped modes in the closed control circuit,
• wherein the damping control includes modeling a network characteristic including oscillation properties, wherein modeling the network characteristic includes:
• modeling a network that represents at least the portion of the electrical supply grid included in the closed control circuit and accounts for a structure of the at least the portion of the electrical supply grid and consumers and producers connected to the at least the portion of the electrical supply grid;
• and
• modeling a wind system which represents a behavior of the wind power system, wherein modeling the wind system also includes a behavior of the wind system controller, and
• wherein the closed control circuit is based on the modeled network characteristic and being linearized with respect to at least one working point to obtain a linearized network characteristic, and provide the damping control based on the linearized network characteristic.