A method of controlling a wind turbine group having a plurality of wind turbines, wherein - each of the wind turbines generates electrical power as wind turbine output power (P A) for feeding into an electrical supply network (120, 320), - the wind turbine group feeds a group power output (P G) into the electrical supply network (120, 320) at a grid connection point (118, 318), wherein - the group power output is substantially formed as the sum of all the wind turbine power outputs (P A) of the wind turbine group, - a maximum group power output is specified to limit the group power output, - to comply with the maximum group power output a control value is transferred to each wind turbine in the wind turbine group in order to limit the output power of the respective wind turbine to a maximum value defined by said control value, - a control relationship is determined as a relationship between potential control values (Pc) and potential group power outputs (P GP), in order to specify the control value, and - the control value - is determined using the control relationship and - depending on the specified maximum group power output (P Gm), and wherein - the control relationship is stored as a table of value tuples, and - each value tuple contains a potential control value (Pc) and a potential group power output (P GP), and/or in that - the control relationship contains a threshold control value (P CL) which is representative of the smallest control value at which the associated group power output has reached its current maximum value, wherein the threshold control value is preferably composed of the value of said smallest control value plus a reserve value and/or - the control value is specified as a relative value, in particular as a percentage value, especially in relation to a nominal power. - each of the wind turbines generates electrical power as wind turbine output power (P A) for feeding into an electrical supply network (120, 320), - the wind turbine group feeds a group power output (P G) into the electrical supply network (120, 320) at a grid connection point (118, 318), wherein - the group power output is substantially formed as the sum of all the wind turbine power outputs (P A) of the wind turbine group, - the group power output is substantially formed as the sum of all the wind turbine power outputs (P A) of the wind turbine group, - a maximum group power output is specified to limit the group power output, - to comply with the maximum group power output a control value is transferred to each wind turbine in the wind turbine group in order to limit the output power of the respective wind turbine to a maximum value defined by said control value, - a control relationship is determined as a relationship between potential control values (Pc) and potential group power outputs (P GP), in order to specify the control value, and - the control value - is determined using the control relationship and - depending on the specified maximum group power output (P Gm), and wherein - is determined using the control relationship and - depending on the specified maximum group power output (P Gm), and wherein - the control relationship is stored as a table of value tuples, and - each value tuple contains a potential control value (Pc) and a potential group power output (P GP), and/or in that - the control relationship contains a threshold control value (P CL) which is representative of the smallest control value at which the associated group power output has reached its current maximum value, wherein the threshold control value is preferably composed of the value of said smallest control value plus a reserve value and/or - the control value is specified as a relative value, in particular as a percentage value, especially in relation to a nominal power.