Method of starting a wind park comprising plural wind turbines connectable in a collector system connectable to a utility grid, the method comprising: starting at least one first wind turbine , each being equipped with an utility grid independent energy supply and a grid forming function , to produce electrical energy from wind energy, thereby utilizing the respective grid independent energy supply for starting; performing the grid forming function by the at least one first wind turbine to achieve a reference voltage (Vreference, Vreference,limited) in the collector system; starting at least one second wind turbine to produce energy by conversion of wind energy, thereby utilizing energy provided in the collector system for starting, characterised in that performing the grid forming function by the at least one first wind turbine comprises: ramping up a converter output voltage of a converter of the first wind turbine in a controlled fashion until a current limit and/or power limit of the converter is reached, wherein ramping up the converter output voltage of the converter of the first wind turbine is performed such as to balance the system load by: monitoring an actual frequency of the collector system voltage; deriving a limited reference voltage (Vreference,limited) based on a frequency difference (Δf) between the actual frequency and a nominal frequency of the collector system voltage; and controlling the converter of the first wind turbine based on the limited reference voltage (Vreference,limited). starting at least one first wind turbine , each being equipped with an utility grid independent energy supply and a grid forming function , to produce electrical energy from wind energy, thereby utilizing the respective grid independent energy supply for starting; performing the grid forming function by the at least one first wind turbine to achieve a reference voltage (Vreference, Vreference,limited) in the collector system; starting at least one second wind turbine to produce energy by conversion of wind energy, thereby utilizing energy provided in the collector system for starting, characterised in that performing the grid forming function by the at least one first wind turbine comprises: ramping up a converter output voltage of a converter of the first wind turbine in a controlled fashion until a current limit and/or power limit of the converter is reached, wherein ramping up the converter output voltage of the converter of the first wind turbine is performed such as to balance the system load by: monitoring an actual frequency of the collector system voltage; deriving a limited reference voltage (Vreference,limited) based on a frequency difference (Δf) between the actual frequency and a nominal frequency of the collector system voltage; and controlling the converter of the first wind turbine based on the limited reference voltage (Vreference,limited). monitoring an actual frequency of the collector system voltage; deriving a limited reference voltage (Vreference,limited) based on a frequency difference (Δf) between the actual frequency and a nominal frequency of the collector system voltage; and controlling the converter of the first wind turbine based on the limited reference voltage (Vreference,limited). <EOS>