Wind turbine with virtual synchronous generator and DC link control

A control system for controlling a wind turbine, the wind turbine comprises a power generator, a machine side converter, a line side converter, a DC link and a chopper electrically connected to an output of the machine side converter and an input of a grid side converter, the control system is arranged to perform an operation, comprising:

• determine a virtual synchronous machine rotational speed and a virtual synchronous machine angle, where the virtual synchronous machine rotational speed is determined based on a combination of a feedback of a damping power, a power reference for a desired power output of the wind turbine, a grid power supplied by the wind turbine to a power grid and a chopper power dissipated by the chopper and an inertial integration model, where the virtual synchronous machine angle is determined based on an integration of the virtual synchronous machine rotational speed, and where the damping power is determined based on the virtual synchronous machine rotational speed.

A computer program product comprising software code adapted to control a wind turbine when executed on a data processing system, the computer program product being adapted to perform an operation for controlling a wind turbine comprising a power generator, a machine side converter, a line side converter, a DC link and a chopper electrically connected to an output of the machine side converter and an input of a grid side converter, the operation comprising:

• determining a virtual synchronous machine rotational speed and a virtual synchronous machine angle, where the virtual synchronous machine rotational speed is determined based on a combination of a feedback of a damping power, a power reference for a desired power output of the wind turbine, a grid power supplied by the wind turbine to a power grid and a chopper power dissipated by the chopper and an inertial integration model, where the virtual synchronous machine angle is determined based on an integration of the virtual synchronous machine rotational speed, and where the damping power is determined based on the virtual synchronous machine rotational speed.