| 摘要 |
A turbine (2) driven electric power production system (1), -said turbine (2) arranged for being driven by a fluid (3) having a fluid speed (v) varying in time, -said turbine (2) connected to a hydrostatic displacement pump (6) further connected to a hydrostatic displacement motor (8) as part of a closed loop hydrostatic transmission system (7), -said motor (8) arranged for driving an electrical generator (9) supplying AC power (10) at a frequency (fg) near a given desired frequency (fdes), characterized by a closed loop system arranged for controlling a volumetric displacement (13) of the hydrostatic motor (8), comprising -a fluid speed meter (11m) arranged for producing a speed signal (11s) representing a speed (v) of said fluid (3), and -a rotational speed meter (12m) arranged for providing a rotational speed signal (12s) representing a rotational speed measurement (omega) of said turbine (2), -a motor displacement control system (15) for continuously receiving said speed signal (11s) and said rotational speed signal (12s) and arranged for calculating a control signal (16), -a volumetric displacement control actuator (17) on said hydrostatic motor, arranged for receiving said control signal (16) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor (8) for maintaining a set turbine tip speed ratio (tsrset) and thereby providing an improved power efficiency of the power production system (1) during fluctuations in said fluid speed (v).
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