HYDROSTATIC DRIVE OF A WIND TURBINE

摘要

The invention relates to a hydrostatic drive for wind turbines, which gives wind turbines power plant characteristics. For this purpose, the connection between the rotor and the generator is established by a total volumetric flow conveyed by a hydraulic pump (1), which is driven by the rotor (19), wherein the total volumetric flow can be distributed to one or more closed hydraulic sub-circuits (T1-n), wherein each sub-circuit (T1-n) comprises a hydraulic motor combination having an adjustable hydraulic motor (4) and a fixed hydraulic motor (3), wherein the hydraulic motors (3, 4) are arranged on a common shaft or rigidly coupled to each other and drive the drive shaft of a synchronous generator (5). The displacement of the adjustable hydraulic motors (4) is set by a controller such that, during isolated operation, the rotational speed of the drive shaft of the associated synchronous generator (5) assumes a constant or approximately constant value so that the synchronous generators of the sub-circuits (T1-n) can be connected directly to a load on the output side. During operation in parallel with a network, the controller sets the drive torque of the generator shafts in such a way that a torque equilibrium between the rotor (19) and the synchronous generators (5) exists.