An electrical power supply arrangement for drive devices of rail vehicles, the power supply arrangement comprising: • a first electrical terminal for connecting the arrangement to an electrical power supply network; • a second electrical terminal (21, 22) for connecting the arrangement to a DC voltage intermediate circuit, to which, in turn, at least one traction inverter for operating at least one driving motor can be connected; • a rectifier arrangement (M 1, M 2, M 3, M 4) for operating the rail vehicle on an AC voltage network, the rectifier arrangement (M 1, M 2, M 3, M 4) being connected via a first filter to the first electrical terminal and comprising at least one module in which a first rectifier is connected via an inverter and a transformer to a second rectifier, the first rectifier on the AC voltage side thereof being connected via the first filter to the first electrical terminal, the second rectifier on the DC voltage side thereof being connected to the second electrical terminal (21, 22), and, in the case of a plurality of the modules, the AC voltage terminals (19, 20) of the first rectifiers being connected in series, but the DC voltage terminals (21, 22) of the second rectifiers being connected in parallel, characterized by • an electrical connection for operating the rail vehicle on a DC voltage network, the electrical connection comprising a second filter, and the electrical connection connecting the first electrical terminal to the second electrical terminal; and • a control unit for controlling the operation of the first rectifier or of the first rectifiers while the rail vehicle is being operated on a DC voltage network, the control unit being configured, by controlling the switching times of semiconductor switches of the first rectifier or of the first rectifiers, to generate an AC voltage at the first electrical terminal that compensates for, or reduces to a permissible level, an electrical AC current, which is a parasitic current flowing from the DC voltage intermediate circuit through the electrical connection as a result of the operation of the drive device of the rail vehicle, the rectifier arrangement comprising a plurality of the modules, and the control unit being configured to select one of the first rectifiers and to switch at least one semiconductor switch of the selected rectifier for varying a voltage necessary for compensating for or reducing the parasitic current, the selection being made as a function of a thermal load of the first rectifiers based on switching losses. • a first electrical terminal for connecting the arrangement to an electrical power supply network; • a second electrical terminal (21, 22) for connecting the arrangement to a DC voltage intermediate circuit, to which, in turn, at least one traction inverter for operating at least one driving motor can be connected; • a rectifier arrangement (M 1, M 2, M 3, M 4) for operating the rail vehicle on an AC voltage network, the rectifier arrangement (M 1, M 2, M 3, M 4) being connected via a first filter to the first electrical terminal and comprising at least one module in which a first rectifier is connected via an inverter and a transformer to a second rectifier, the first rectifier on the AC voltage side thereof being connected via the first filter to the first electrical terminal, the second rectifier on the DC voltage side thereof being connected to the second electrical terminal (21, 22), and, in the case of a plurality of the modules, the AC voltage terminals (19, 20) of the first rectifiers being connected in series, but the DC voltage terminals (21, 22) of the second rectifiers being connected in parallel, • an electrical connection for operating the rail vehicle on a DC voltage network, the electrical connection comprising a second filter, and the electrical connection connecting the first electrical terminal to the second electrical terminal; and • a control unit for controlling the operation of the first rectifier or of the first rectifiers while the rail vehicle is being operated on a DC voltage network, the control unit being configured, by controlling the switching times of semiconductor switches of the first rectifier or of the first rectifiers, to generate an AC voltage at the first electrical terminal that compensates for, or reduces to a permissible level, an electrical AC current, which is a parasitic current flowing from the DC voltage intermediate circuit through the electrical connection as a result of the operation of the drive device of the rail vehicle,