RUN-OF-THE-RIVER OR MARINE CURRENT POWER PLANT AND METHOD FOR OPERATING THE SAME

摘要

The invention relates to a method for operating a run-of-the-river or marine current power plant (1), comprising a water turbine (3) with a plurality of rotor blades (4.1, 4.2, 4.3) designed as buoyancy rotors, and an electrical generator (11) that is at least indirectly driven by the water turbine (3), the water turbine (3) being operated in an overspeed range above a performance optimum tip speed ratio (lambdaopt) to limit the performance. The invention is characterized in that the water turbine (3) is matched to the immersion depth (T) of the run-of-the-river or marine current power plant (1) such that cavitation occurs on at least one rotor blade section in the overspeed range as of a cavitation tip speed ratio threshold (lambdak) which lies below a tip speed ratio (lambdad) associated with a racing speed, and the water turbine (3) is operated at tip speed ratios up to above the cavitation tip speed ratio threshold (lambdak) to limit the load.