Operating a wind turbine and a wind farm in different grid strength

It is described a method of controlling a wind turbine comprised in a wind farm and connected to a point of common coupling connected to a utility grid, the method comprising: measuring at least one quantity indicative of a short circuit ratio (X, SCR, DV/DQ , V/I) of the utility grid; adjusting a control parameter (Kop, Vcon_kp, Ikp) of a control system (200, 201, 203) controlling the wind turbine and the wind farm based on the measured value of the quantity.