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 marine current power plant, comprising a water turbine with several rotor blades arranged as buoyancy rotors, an electric generator which is driven at least indirectly by the water turbine, wherein the water turbine is guided for power limitation in an overspeed range above a power-optimal tip speed ratio. The water turbine is adjusted to the immersion depth of the marine current power plant in such a way that cavitation occurs on at least one rotor blade section in the overspeed range from a cavitation tip speed ratio threshold which lies below a tip speed ratio associated with a runaway speed, and the water turbine is operated for load limitation at tip speed ratios which lie above the cavitation tip speed ratio threshold.