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The doubly-fed induction generator machine is one of the most widely used generator in the MW-class windmills producing a considerable amount of energy from wind. Its control through the rotor slip-rings with a back-to-back converter enables, together with the maximum active power flow, the distribution of the required reactive power between stator, rotor, and mains. This splitting can be chosen in order to minimise the system losses and avoid overloading the system components. Hence an optimised efficiency of high power windmills using this kind of generator brings a significant improvement on the yearly energy production.