| 摘要 |
A closed loop turbine speed control system (30) for a turbine power production system (1) comprising a closed loop hydrostatic transmission system (10) for the transfer of energy from a wind turbine rotor (2) to a generator (20). A displacement actuator (d) is arranged for receiving a displacement control signal (ds) from the control system (30) and for controlling a displacement of the displacement motor (12). The control system (30) comprises a turbine rotor speed feedback control loop (32) for calculating the displacement control signal (ds) based on deviations of a turbine rotor actual rotational speed (?p) from a turbine rotor set rotational speed (? ps). In addition a hydraulic pressure meter (pm) measures the hydraulic pressure of the hydrostatic system (10) and provides a hydraulic pressure signal (ps) as an input to a pressure feedback control loop (31) for stabilising the displacement control signal (ds) based on the hydraulic pressure signal (ps).
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