Device and control procedure for recovery of kinetic energy in railway systems

DEVICE FOR RECOVERY OF KINETIC ENERGY IN RAILWAY SYSTEMS, wherein the railway system has a DC catenary (20) connected to a rectifier bridge block (40) that is in turn connected to the secondary winding of a transformer (30), present in the connection of the corresponding substation, the primary winding of which is connected to a three-phase AC grid (10), the device being connected between the catenary (20) and the secondary winding of the transformer (30);

• characterized in that the device (50) has a first DC/DC voltage raising block (51, 51a, 51b, 51c) that isolates from harmonics and fluctuations of the catenary, connected between the catenary (20) and an intermediate bus provided with a capacitor (53, 53′) which in turn is connected with a second block for DC/AC three-phase current generation (52, 52a, 52b) joined to the secondary winding of the transformer (30);
• such that during the braking of the corresponding train the said first block allows raising the DC voltage of the catenary, generating a controlled voltage in the intermediate bus;
• while the said second block, with this controlled voltage, allows generating a high-quality three-phase current that is delivered to the three-phase grid (10) through the transformer (30).