A wind turbine assembly comprising: a rotor system; a generator for generating an alternating current, the generator having a nominal output voltage, and being adapted to be rotated by the rotor system; a first converter having an alternating current side connected electrically to the generator, and a direct current side, the first converter comprising a first bridge circuit having a plurality of switch members each having a controllable switch and a diode connected antiparallel with the controllable switch; a second converter having a direct current side connected electrically to the direct current side of the first converter, and an alternating current side, the second converter comprising a second bridge circuit having a plurality of switch members each having a controllable switch; and a controller system adapted to control the first converter and second converter, characterized in that the controller system is adapted to provide a drying operation for second converter comprising: short circuiting the second converter with the controllable switches of the second bridge circuit; and supplying power from the generator through the first converter to the short circuited second converter for drying the second converter, wherein during the drying operation for second converter, voltage of the generator is lower than the nominal output voltage of the generator and wherein the voltage of the generator is kept so low that no breakthroughs occur, and currents in electrical components of the wind turbine assembly remain sufficiently low. a rotor system; a generator for generating an alternating current, the generator having a nominal output voltage, and being adapted to be rotated by the rotor system; a first converter having an alternating current side connected electrically to the generator, and a direct current side, the first converter comprising a first bridge circuit having a plurality of switch members each having a controllable switch and a diode connected antiparallel with the controllable switch; a second converter having a direct current side connected electrically to the direct current side of the first converter, and an alternating current side, the second converter comprising a second bridge circuit having a plurality of switch members each having a controllable switch; and a controller system adapted to control the first converter and second converter, characterized in that the controller system is adapted to provide a drying operation for second converter comprising: short circuiting the second converter with the controllable switches of the second bridge circuit; and supplying power from the generator through the first converter to the short circuited second converter for drying the second converter, wherein during the drying operation for second converter, voltage of the generator is lower than the nominal output voltage of the generator and wherein the voltage of the generator is kept so low that no breakthroughs occur, and currents in electrical components of the wind turbine assembly remain sufficiently low. short circuiting the second converter with the controllable switches of the second bridge circuit; and supplying power from the generator through the first converter to the short circuited second converter for drying the second converter, wherein during the drying operation for second converter, voltage of the generator is lower than the nominal output voltage of the generator and wherein the voltage of the generator is kept so low that no breakthroughs occur, and currents in electrical components of the wind turbine assembly remain sufficiently low.