Pumped storage power plant, method for operating a pumped storage power plant and pumped storage system

摘要

The present invention relates to a pumped storage power plant comprising a working cylinder partially submerged in a working fluid reservoir, such as a water storage tank, with an upper fluid compartment substantially above a fluid level of the working fluid reservoir and a lower fluid compartment substantially below the fluid level, a lift piston which is movably guided relative to the working cylinder in the gravitational direction and the upper fluid compartment is sealed off from the lower fluid compartment in such a way that a gravitational fluid exchange between the upper fluid compartment and the lower fluid compartment is prevented, an energy loading mode in which working fluid is let into the upper fluid compartment, so that under the influence of the weight force and / or the hydrodynamic pressure of the upper fluid let into the upper fluid compartment the buoyancy piston is immersed in the sub-fluid compartment with respect to the fluid level, and an energy discharge operation in which under the influence of the occurrences ebskraft of the buoyancy piston upper fluid is pressed out of the upper fluid compartment and / or in which a fluid column of the upper fluid built up during the energy charging operation preferably flows constantly from the upper fluid compartment.