power grid and is supplied to at least one electrical consumer of the at least one wind turbine and depending on a further state variable of the electrical power grid electrical reactive power is fed into the electrical power grid or electrical reactive power is removed from the electrical power grid application_number US 201415034145 A description fig1 shows a wind turbine 100 with a tower 102 and a nacelle 104 a rotor 106 having three rotor blades 108 and a spinner 110 is arranged on the nacelle 104 during operation the rotor 106 is set in a rotary motion by the wind and thus drives a generator in the nacelle 104 fig2 shows a wind farm 112 comprising by way of example three wind turbines 100 which may be the same or different the three wind turbines 100 are thus representative of in principle any number of wind turbines of a wind farm 112 the wind turbines 100 provide their power specifically in particular the produced current via an electrical farm grid 114 here the produced currents or powers of the individual wind turbines 100 are added and a transformer 116 is usually provided which performs an upward transformation of the voltage in the farm so as to then feed this into the power grid 120 at the feed point 118 which is also referred to generally as the grid point of common coupling or pcc for short fig2 is merely a simplified illustration of a wind farm 112 which for example does not show any controller although a controller is of course provided by way of example the farm grid 114 can also be formed differently in which for example.