NOVELTY - The system (5) has branches (9) placed in parallel manner, where each branch includes a reversible current converter (CV1-CVx) and supercapacitors (SC). The reversible converter is placed in series with the supercapacitors. Each branch includes a voltage regulator for regulating voltage of the supercapacitors, where the voltage regulator is associated with a current limiter limiting current as a function of voltage. The branch includes an input voltage regulating unit for regulating input voltage (UF) so as to continuously adjust an optimum operating point.    USE - Capacitive energy storage system for storing energy obtained from a regenerative braking device of a vehicle e.g. train, via an electrical power distribution network in an electric passenger transport infrastructure (claimed). Can also be used for a tramcar, a light-rail transit system, and a trolley-bus.    ADVANTAGE - The input voltage regulating unit regulates the input voltage so as to continuously adjust the optimum operating point, thus increasing the lifetime of the supercapacitors, while maximizing the transferred energy. The parallel branches allow the utilization of low power converters instead of a high capacity converter, thus facilitating access to components distributed in a better manner, while having low conduction loss. The design of the system enables optimizing conversion efficiency of the converters and storage/discharging efficiency of the supercapacitors. The branches operate in an independent manner, so that one of the branches continues its operation in degraded mode until maintenance or repairing operation is carried out, when the other branch is inoperative, thus limiting downtime of the system, while facilitating maintenance operations of the system.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) an electric passenger transport infrastructure    (2) a method for controlling a capacitive energy storage system.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the capacitive energy storage system.    Reversible current converter (CV1-CVx)    Supercapacitors (SC)    Input voltage (UF)    Capacitive energy storage system (5)    Branches (9)