SYSTEM FOR STORING ELECTRIC ENERGY IN COMBINED GRAVITATIONAL-HYDRAULIC CYCLE

摘要

The invention relates to a system for storing electric energy in combined gravitational-hydraulic cycle, intended mainly for electric energy production and delivery systems, meant to be used for storing high/significant amounts of energy during periods or time intervals in which the system produces excess electric energy, in order to distribute it in consumption peak periods. According to the invention, the system comprises a piston (30) rendered heavier by means of some blocks (31) of material with high specific weight which are symmetrically fixed onto the piston circumference, having the role of accumulating gravitational potential energy by vertically lifting it inside of a cylinder (10) with reinforced concrete wall filled with water, the piston (30) resting on the wall of the cylinder (10) by means of some guides (35) with rollers and being centrally provided with a circular opening , in the axis of the cylinder (10) there being a high-pressure discharge channel (20) passing through the center of the piston (30) and leading the water under pressure from the base of the cylinder (10) to an energy generating system (50) using impulse turbines, the discharge channel (20) being sealed at the top and dis-aerated, the water processed in the electric energy production cycle (50) being discharged back into the cylinder (10), above the piston, through a return channel (25) at atmospheric pressure, where, for the cycle of absorption and storage of energy from an electric network, it also comprises an electric energy absorption system (60) comprising high pressure pumps with variable flow rate, which takes over the water from above the piston (30) through the return channel (25) and introduces it in the discharge channel (20), under the piston (30), to lift it.