The present invention relates to a method and a
system for operating a Wind
Turbine (WTG), which WTG comprises a rotor comprising at least two blades, which blades are
pitch regulated, where the rotor is connected to a shaft, which shaft is supported by bearings, and which shaft drives at least one generator, where the WTG uses a
load regulation system for regulating the individual
pitch of at least two blades. The object of the invention is to compensate for asymmetric load on the rotor in a wind
turbine, a second object is to reduce wearing at shaft bearings in the wind
turbine, and a third object is to increase the power production of a wind
turbine. This can be achieved if the
load regulation system measures the actual rotor load by at least one displacement sensor, which displacement sensor is measuring the bending of the main shaft, where the
load regulation system based on the shaft bending regulates the individual
pitch of the blades for compensating asymmetric load at the rotor.