Patent ID: 7256509

Claim:
A wind-driven power-plant ( 10 ) comprising: a rotor ( 12 ) fitted with at least one angularly adjustable rotor blade ( 14 ), a generator which can be both connected directly or indirectly to the rotor ( 12 ) to generate electric power and connected directly or indirectly to an electric grid ( 25 ) to feed electric power to said grid, and at least one rotor blade adjustment system which adjusts the angle of the rotor blade ( 14 ) and which is made up of at least one blade adjusting drive ( 20 ) fitted with at least one DC motor ( 23 ) that may be connected through a converter ( 24 ) to the electric grid ( 25 ), of a control unit ( 33 ) connected to the converter ( 24 ) and controlling and/or regulating the blade adjusting drive ( 20 ), and of a DC voltage source ( 31 ) assuring power supply to the blade adjusting drive ( 20 ) in the event of failure of the grid ( 25 ), wherein the DC voltage source ( 31 ) may be connected directly to the blade adjusting drive ( 20 ) or indirectly to it through the converter ( 24 ), the DC voltage source ( 31 ) being connected in priority manner indirectly through the converter ( 24 ) to the blade adjusting drive ( 20 ), the converter ( 24 ) being designed in a manner to allow converting both the AC voltage from the grid ( 25 ) and the DC voltage from the DC voltage source ( 31 ).