The station-building power supply device includes a capacitor unit that stores therein surplus regenerative power, a first power conversion unit that performs DC/DC power conversion, and a second power conversion unit that converts DC power. A first voltage threshold for detecting the occurrence of surplus regenerative power is set and a first SOC threshold for detecting whether the capacitor unit can discharge is set. The first power conversion unit is controlled such that power is supplied from the feeder to the capacitor unit to charge the capacitor unit when the feeding voltage exceeds the first voltage threshold, and the second power conversion unit is controlled such that power is supplied from the capacitor unit to the station loads when the SOC of the capacitor unit exceeds the first SOC threshold.

The station-building power supply device includes a capacitor unit that stores therein surplus regenerative power, a first power conversion unit that performs DC/DC power conversion, and a second power conversion unit that converts DC power. A first voltage threshold for detecting the occurrence of surplus regenerative power is set and a first SOC threshold for detecting whether the capacitor unit can discharge is set. The first power conversion unit is controlled such that power is supplied from the feeder to the capacitor unit to charge the capacitor unit when the feeding voltage exceeds the first voltage threshold, and the second power conversion unit is controlled such that power is supplied from the capacitor unit to the station loads when the SOC of the capacitor unit exceeds the first SOC threshold.

A railroad network (10) having a track (12), a network energy supply (14) and a plurality of trains (16) that are connectable to the network energy supply (14) via means (20) for connecting the train (16) to the network energy supply (14) and each have an internal energy storage system (24) for receiving and storing energy originating from said train (16) or from trains (16) of the railroad network (10) and for supplying energy to said train (16) or to trains (16) of the railroad network (10). Each train (16) is able to switch from an operational state in which it is able to move along the system of rails (12) and an idle state in which it is unable to move along the system of rails (12) and vice versa. At least one of the trains (16) of the railroad network (10) is in the idle and energized state at the same time, its internal energy storage system (24) being connected to the network energy supply (14).

A railroad network (10) having a track (12), a network energy supply (14) and a plurality of trains (16) that are connectable to the network energy supply (14) via means (20) for connecting the train (16) to the network energy supply (14) and each have an internal energy storage system (24) for receiving and storing energy originating from said train (16) or from trains (16) of the railroad network (10) and for supplying energy to said train (16) or to trains (16) of the railroad network (10). Each train (16) is able to switch from an operational state in which it is able to move along the system of rails (12) and an idle state in which it is unable to move along the system of rails (12) and vice versa. At least one of the trains (16) of the railroad network (10) is in the idle and energized state at the same time, its internal energy storage system (24) being connected to the network energy supply (14).

A voltage control device includes a fluctuation calculating unit that calculates voltage tolerance, which is a difference between a voltage measured by a voltage control apparatus and a proper voltage upper limit value or a proper voltage lower limit value, and voltage sensitivity, which is a ratio of a fluctuation amount of active power and a fluctuation amount of the voltage, a change-request-information generating unit that generates information for requesting a change of a limit value of a control target range of other voltage control devices, a change processing unit that performs a change of a limit value of a control target range of the voltage control device according to content of the change request information, and a communication processing unit that transmits the change request information to the voltage control devices other than the voltage control device. The change request information includes information indicating voltage tolerance and voltage sensitivity.

A voltage control device includes a fluctuation calculating unit that calculates voltage tolerance, which is a difference between a voltage measured by a voltage control apparatus and a proper voltage upper limit value or a proper voltage lower limit value, and voltage sensitivity, which is a ratio of a fluctuation amount of active power and a fluctuation amount of the voltage, a change-request-information generating unit that generates information for requesting a change of a limit value of a control target range of other voltage control devices, a change processing unit that performs a change of a limit value of a control target range of the voltage control device according to content of the change request information, and a communication processing unit that transmits the change request information to the voltage control devices other than the voltage control device. The change request information includes information indicating voltage tolerance and voltage sensitivity.

An electric railcar power feeding system in an embodiment includes a power storage device, a rectifier, and an emergency power supply. The power storage device is connected to a feeder line for an electric railcar. The rectifier converts alternating-current power of a first power system to direct-current power and supply the direct-current power for the feeder line. The emergency power supply supplies power of a second power system different from the first power system for the feeder line.

An electric railcar power feeding system in an embodiment includes a power storage device, a rectifier, and an emergency power supply. The power storage device is connected to a feeder line for an electric railcar. The rectifier converts alternating-current power of a first power system to direct-current power and supply the direct-current power for the feeder line. The emergency power supply supplies power of a second power system different from the first power system for the feeder line.

An arrangement and a method for carrying out a self-load test on a rail vehicle which has a dual-mode drive system. A first drivetrain of the rail vehicle includes a diesel engine, which is coupled to an electric generator to generate electrical power. The generator is connected via a first converter to a DC link to transfer the power delivered by the generator as required into the DC link. A second drivetrain of the rail vehicle has an electrical line system, which is connected via a second converter to the DC link to transfer power from the line system as required into the DC link. During the self-load test of the diesel engine, the power delivered by the generator passes in part via a third converter to a braking resistor and in part via the second converter into the line system.

An electrical power supply system for an electrically propelled vehicle provided with a traction unit and an electrical connector and moving along a circulation rail includes an external power supply zone having a supply line extending along the circulation rail for connection with the electrical connector, and an autonomous power supply zone, located after the external power supply zone along the circulation rail. The supply line includes a main section. The supply line includes a terminal section, extending along the circulation rail in the external power supply zone at least between a first end of the main section and the autonomous power supply zone, for connection with the electrical connector, and a diode, electrically connecting the first end of the main section and a second end of the terminal section and designed to let an electrical current pass through from the main section to the terminal section.