A railroad system includes a first vehicle and a second vehicle. The first vehicle includes a drive-part, an inverter, an electric storage device, and a control part. The control part controls feasibility of charge or discharge of the electric storage device based on a detection value of any of a charge accumulation amount of the electric storage device, a distance between the first vehicle and the second vehicle, or a voltage value of a power line. When it is assumed that the detection value when charge or discharge of the electric storage device is switched from an allowable state to a prohibited state is a first set value, and the detection value when charge or discharge of the electric storage device is switched from a prohibited state to an allowable state is a second set value, the first set value and the second set value are different from each other.

A railroad system includes a first vehicle and a second vehicle. The first vehicle includes a drive-part, an inverter, an electric storage device, and a control part. The control part controls feasibility of charge or discharge of the electric storage device based on a detection value of any of a charge accumulation amount of the electric storage device, a distance between the first vehicle and the second vehicle, or a voltage value of a power line. When it is assumed that the detection value when charge or discharge of the electric storage device is switched from an allowable state to a prohibited state is a first set value, and the detection value when charge or discharge of the electric storage device is switched from a prohibited state to an allowable state is a second set value, the first set value and the second set value are different from each other.

A station-building power-supply device includes: a detector that detects a ripple in an overhead line voltage and outputs information on the detected ripple and an overhead line voltage value; a determiner that compares the information with a threshold for determining whether a ripple is in the overhead line voltage, and outputs the overhead line voltage value obtained when a ripple is determined to be not in the overhead line voltage based on the comparison result; an estimator that estimates, based on the overhead line voltage value, a no-load voltage value of an overhead line in a no-load state; a controller that sets an additional value; and a calculator that adds the additional value to the no-load voltage value to calculate a regeneration determining voltage value for determining whether an electric vehicle performs regeneration, and outputs the regeneration determining voltage value to a circuit that utilizes energy generated by the regeneration.

A station-building power-supply device includes: a detector that detects a ripple in an overhead line voltage and outputs information on the detected ripple and an overhead line voltage value; a determiner that compares the information with a threshold for determining whether a ripple is in the overhead line voltage, and outputs the overhead line voltage value obtained when a ripple is determined to be not in the overhead line voltage based on the comparison result; an estimator that estimates, based on the overhead line voltage value, a no-load voltage value of an overhead line in a no-load state; a controller that sets an additional value; and a calculator that adds the additional value to the no-load voltage value to calculate a regeneration determining voltage value for determining whether an electric vehicle performs regeneration, and outputs the regeneration determining voltage value to a circuit that utilizes energy generated by the regeneration.

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.

Methods and systems are provided for electrical power distribution. In one example, a system includes plurality of electric consumers comprising one or more operating modes with different levels of power consumption, an energy storage and an electric machine arranged in the vehicle and configured to provide energy to the energy storage device or power to the electric consumers and torque to wheels of the vehicle, a power allocating device coupled to the energy storage device and the plurality of electric consumers, and a controller configured to maintain two indices for allocating power to the plurality of electric consumers, wherein a first index comprises a first power allocation strategy based on power from only the energy storage device and a second index comprises a second power allocation strategy based on power from the energy storage device and the electric machine.

Methods and systems are provided for electrical power distribution. In one example, a system includes plurality of electric consumers comprising one or more operating modes with different levels of power consumption, an energy storage and an electric machine arranged in the vehicle and configured to provide energy to the energy storage device or power to the electric consumers and torque to wheels of the vehicle, a power allocating device coupled to the energy storage device and the plurality of electric consumers, and a controller configured to maintain two indices for allocating power to the plurality of electric consumers, wherein a first index comprises a first power allocation strategy based on power from only the energy storage device and a second index comprises a second power allocation strategy based on power from the energy storage device and the electric machine.

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.