The present invention concerns a method and system for reducing the electric power consumption of a railway system comprising at least one catenary, trains and at least one substation connected to sections of catenary and providing electric power to the catenary, wherein during the braking of the trains, the braking trains provide electric power to the catenary. The substation is associated to one device for reducing the electric power consumption and the invention: detects the presence of a braking train in one of the section connected to the substation, interrupts the electric power provided by the substation to the catenary if the presence of the braking train is detected, detects the absence of braking trains in each section connected to the substation, means for enabling the electric power to be provided by the substation to the catenary if the absence of braking trains is detected.

The present invention concerns a method and system for reducing the electric power consumption of a railway system comprising at least one catenary, trains and at least one substation connected to sections of catenary and providing electric power to the catenary, wherein during the braking of the trains, the braking trains provide electric power to the catenary. The substation is associated to one device for reducing the electric power consumption and the invention: detects the presence of a braking train in one of the section connected to the substation, interrupts the electric power provided by the substation to the catenary if the presence of the braking train is detected, detects the absence of braking trains in each section connected to the substation, means for enabling the electric power to be provided by the substation to the catenary if the absence of braking trains is detected.

A DC-feeding-voltage calculating apparatus includes storage that stores train model information including information for controlling a regenerative power reducing amount in a train in an electrified section; feeding network model information including position information on a substation; and substation model information including control information on a substation voltage. On the basis of: the stored information; a voltage value, current values of feeders by train direction, the voltage and current values being measured in the substation; and first train information on a train including a wireless communication apparatus, an estimator estimates second train information on a train not including a wireless communication apparatus and outputs train operation information. A calculator, on the basis of the stored information and the train operation information, calculates a substation voltage setting value for controlling the substation voltage such that regenerative power is increased in a regenerative car in the electrified section.

The present invention concerns a method and a device for controlling the voltage of a catenary supplying electric power to rolling stocks. A first rolling stock: detects a traction command or a regeneration command of a second rolling stock in the neighborhood of first rolling stock, increases the electric power supplied by the first rolling stock to the motor drive of the first rolling stock when a regeneration command of the second rolling stock is detected, decreases the electric power supplied by the first rolling stock to the motor drive of the first rolling stock when a traction command of the second rolling stock is detected.

The present invention concerns a method and a device for controlling the voltage of a catenary supplying electric power to rolling stocks. A first rolling stock: detects a traction command or a regeneration command of a second rolling stock in the neighborhood of first rolling stock, increases the electric power supplied by the first rolling stock to the motor drive of the first rolling stock when a regeneration command of the second rolling stock is detected, decreases the electric power supplied by the first rolling stock to the motor drive of the first rolling stock when a traction command of the second rolling stock is detected.

A station building auxiliary power unit includes a start-of-operation determination unit that determines, based on a first signal that represents information on a power flow direction indicating a direction of flow of electrical power between an AC distribution line electrically connecting to an electric vehicle and a substation for supplying AC power to the AC distribution line, whether first AC power on an AC distribution line side is to be transformed into second AC power usable by a load, and if it is determined that transformation is to be performed, generates and outputs a second signal, a voltage instruction value calculator that calculates and outputs a voltage instruction value corresponding to the second signal, and a PWM signal generator that generates a control signal for a power converter circuit operated upon transformation of the first AC power into the second AC power, and outputs the control signal.

A station building auxiliary power unit includes a start-of-operation determination unit that determines, based on a first signal that represents information on a power flow direction indicating a direction of flow of electrical power between an AC distribution line electrically connecting to an electric vehicle and a substation for supplying AC power to the AC distribution line, whether first AC power on an AC distribution line side is to be transformed into second AC power usable by a load, and if it is determined that transformation is to be performed, generates and outputs a second signal, a voltage instruction value calculator that calculates and outputs a voltage instruction value corresponding to the second signal, and a PWM signal generator that generates a control signal for a power converter circuit operated upon transformation of the first AC power into the second AC power, and outputs the control signal.

The present invention concerns a method and system for reducing the electric power consumption of a railway system comprising at least one catenary, trains and at least one substation connected to sections of catenary and providing electric power to the catenary, wherein during the braking of the trains, the braking trains provide electric power to the catenary. The substation is associated to one device for reducing the electric power consumption and the invention: detects the presence of a braking train in one of the section connected to the substation, interrupts the electric power provided by the substation to the catenary if the presence of the braking train is detected, detects the absence of braking trains in each section connected to the substation, means for enabling the electric power to be provided by the substation to the catenary if the absence of braking trains is detected.

The present invention concerns a method and system for reducing the electric power consumption of a railway system comprising at least one catenary, trains and at least one substation connected to sections of catenary and providing electric power to the catenary, wherein during the braking of the trains, the braking trains provide electric power to the catenary. The substation is associated to one device for reducing the electric power consumption and the invention: detects the presence of a braking train in one of the section connected to the substation, interrupts the electric power provided by the substation to the catenary if the presence of the braking train is detected, detects the absence of braking trains in each section connected to the substation, means for enabling the electric power to be provided by the substation to the catenary if the absence of braking trains is detected.

A negative voltage backflow direct current supply system for a rail transport is provided. The system adds a negative voltage return line and a DC converter for realizing negative voltage backflow current based on traditional DC power supply system. The negative voltage backflow line replaces the backflow line of running rail in the traditional DC power supply system, which can greatly reduce or eliminate the stray current in the traditional DC power supply system and the negative influence of too high ground potential of running rail. At the same time, the DC converter can be used as regenerative braking energy storage device of train to improve the regenerative braking energy utilization efficiency of DC power supply system and maintain the voltage stability of DC power supply system of rail transport.