A wind farm with a plurality of wind turbines that are connectable to an electric farm network that is connectable via a connection node to an electrical supply network, wherein the wind farm has the following: - a central control system that has a first measuring unit that measures a voltage, power factor, reactive power or a current actual value before or after the connecting node of the wind farm, and that has a first controller (12, 12B) connected to the measuring unit by means of which, depending on the measured actual value, the central control system determines a corrective value (26, 28) for a local setpoint of one or more wind turbines, and - a turbine control for at least one wind turbine that has a second measuring unit which measures a voltage, power factor, reactive power or current actual value at or in the proximity of the the wind turbine, and that has a controller connected to the second measuring unit by means of which, depending on the measured actual value, the turbine control determines a local setpoint for an electrical quantity to be generated by the wind turbine, - characterized in that the turbine control determines the sum of the local setpoint and corrective value as an overall setpoint for the electrical variable of the wind turbine to be generated, - a constant or variable setpoint for an electrical variable to be controlled by the wind farm is applied to the first controller (12, 12B), and - the first measuring unit is connected to the first controller (12, 12B) via a first data transmission medium, and the second measuring unit is connected to the second controller via a second data transmission medium, and the first data transmission medium is designed as a slow medium, and the second data transmission medium is designed as a fast medium. - a central control system that has a first measuring unit that measures a voltage, power factor, reactive power or a current actual value before or after the connecting node of the wind farm, and that has a first controller (12, 12B) connected to the measuring unit by means of which, depending on the measured actual value, the central control system determines a corrective value (26, 28) for a local setpoint of one or more wind turbines, and - a turbine control for at least one wind turbine that has a second measuring unit which measures a voltage, power factor, reactive power or current actual value at or in the proximity of the the wind turbine, and that has a controller connected to the second measuring unit by means of which, depending on the measured actual value, the turbine control determines a local setpoint for an electrical quantity to be generated by the wind turbine, - characterized in that the turbine control determines the sum of the local setpoint and corrective value as an overall setpoint for the electrical variable of the wind turbine to be generated, - a constant or variable setpoint for an electrical variable to be controlled by the wind farm is applied to the first controller (12, 12B), and - the first measuring unit is connected to the first controller (12, 12B) via a first data transmission medium, and the second measuring unit is connected to the second controller via a second data transmission medium, and the first data transmission medium is designed as a slow medium, and the second data transmission medium is designed as a fast medium.