Wind park control system

It is described a wind park control system (101) for controlling a reactive power output of a plurality of wind turbines (105, 106, 107) of a wind park (100), wherein the wind park is adapted to deliver active power and reactive power to a utility grid (417). The wind park control system (101) comprises a determination unit (102) being adapted to determine a total amount of reactive power being required by the utility grid (417) and being adapted to determine for each wind turbine (105, 106, 107) an individual amount of reactive power, which the wind turbine (105, 106, 107) is capable to deliver, a calculation unit (103) being adapted to calculate a capability scheme, wherein the capability scheme comprises an order for the plurality of wind turbines (105, 106, 107) according to which order the wind turbines (105, 106, 107) are selected for delivering reactive power, wherein the capability scheme is calculated based on the determined individual amount of reactive power of each wind turbine (105, 106, 107) and the total electrical power loss being contributed by each connection of all the wind turbines (105, 106, 107) to the utility grid (417), and an adjustment unit (104) being adapted to adjust an actual amount of reactive power to be provided by the plurality of wind turbines (105, 106, 107), wherein the reactive power output of each wind turbine (105, 106, 107) is controlled based on the calculated capability scheme wherein the wind turbines (105, 106, 107) are selected for delivering reactive power in the order of the capability scheme, such that the determined total amount of reactive power is fulfilled.