Patent ID: 7081689
Filing Date: 2006-07-25
Classification: F03D,F05B,F16H,Y02E

Abstract:
1. A wind power plant connectable to an electric grid comprising: a first control level having a wind rotor with rotor blades, a power split gear driven at least indirectly by the wind rotor, a hydrodynamic speed transformer and a generator with power electronics, the power split gear having first and second power branches, the hydrodynamic speed transformer having a reaction member that takes up power from the first power branch and produces a feedback of power via the second power branch to the power split gear depending on a setting of the reaction member, the generator being driven at least indirectly by the first power branch and emitting electric power to the electric grid with constant system frequency; a second control level having a controller that controls an angular position of the rotor blades or controls a setting of the reaction member of the hydrodynamic speed transformer or controls the power electronics of the generator; and a third control level activating and deactivating the controller of the second control level or predetermining setpoint characteristics for the controller of the second control level depending on operating states of the wind power plant or the electric grid or characteristics of the wind.