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 a device for controlling the voltage of a catenary supplying electric power to rolling stocks. The 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 means for heating, ventilation and air conditioning when a regeneration command of the second rolling stock is detected, decreases the electric power supplied by the first rolling stock to the means for heating, ventilation and air conditioning 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. The 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 means for heating, ventilation and air conditioning when a regeneration command of the second rolling stock is detected, decreases the electric power supplied by the first rolling stock to the means for heating, ventilation and air conditioning when a traction command of the second rolling stock is detected.

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.

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.

Disclosed is a DC power supply device that includes: a transformer having a primary side and a secondary side; a diode rectifier connected at its input side to the secondary side of the transformer; an inverter connected at its output side to the secondary side of the transformer; and a controller. The inverter is controlled by the controller to generate reactive power and/or harmonics onto the secondary side of the transformer so as to regulate the DC voltage at the output side of the diode rectifier to a target value. The controller receives at its input side at least one DC signal outputted by the diode rectifier and uses the at least one DC signal to control the inverter.

Feeder sections to be a target of interchange are to be expanded in order to improve the effect of power interchange between feeders. A control device for railway power conditioner is connected to a first feeder connected to a load side of a transformer in a first railway substation including a transformer receiving power from a power grid, and a second feeder connected to a load side of a transformer in a second railway substation including a transformer receiving power from a power grid, and decides an amount of power interchanged between the first and second feeders. The control device decides the amount of power interchanged between the first and second feeders, using the received power in the first railway substation and power on the first feeder, and the received power in the second railway substation and power on the second feeder.

Feeder sections to be a target of interchange are to be expanded in order to improve the effect of power interchange between feeders. A control device for railway power conditioner is connected to a first feeder connected to a load side of a transformer in a first railway substation including a transformer receiving power from a power grid, and a second feeder connected to a load side of a transformer in a second railway substation including a transformer receiving power from a power grid, and decides an amount of power interchanged between the first and second feeders. The control device decides the amount of power interchanged between the first and second feeders, using the received power in the first railway substation and power on the first feeder, and the received power in the second railway substation and power on the second feeder.

A method and system include determining a resonant frequency of a vehicle system operably coupled with an external power source that provides voltage and current to the vehicle system. A first filter extracts a phase or a frequency component from the voltage provided by the external power source to generate a stabilizing voltage component. A second filter extracts a phase or a frequency component from the current provided by the external power source to generate a stabilizing current component. The stabilizing voltage component is out of phase with the stabilizing current component. A control input of a converter device of the vehicle system is determined based on the stabilizing voltage component, the stabilizing current component, and the resonant frequency. The stabilizing voltage component, the stabilizing current component, and the control input are communicated with the converter device to change the resonant frequency of the vehicle system.