Station auxiliary power supply unit and power supply system

Abstract

A station auxiliary power source device (1) comprises an electric power conversion unit (11) and an electric power conversion control unit (12). The electric power conversion unit (11) converts regenerative electric power supplied from an electric railway vehicle (93) to electric power to be supplied to a station facility (96) and a peripheral facility (97), and outputs the converted electric power. The electric power conversion control unit (12) monitors the voltage of a railway electric power supply line (92) and controls the electric power conversion unit (11) in accordance with the voltage of the railway electric power supply line (92). When the output electric power of the electric power conversion unit (11) is greater than the power consumption of the station facility (96), the output electric power of the electric power conversion unit (11) is supplied to the station facility (96) and the peripheral facility (97) via a facility electric power supply line (95). When the output electric power of the electric power conversion unit (11) is equal to or less than the power consumption of the station facility (96), the output electric power of the electric power conversion unit (11) is supplied to the station facility via the facility electric power supply line (95).

Description

[Technical Field]

[0001] The present disclosure relates to a station auxiliary power supply device and a power supply system. [Background technology]

[0002] Regenerative power generated when an electric railway vehicle brakes is supplied to the onboard equipment of the electric railway vehicle, other electric railway vehicles traveling nearby, and station facilities such as air conditioning equipment, lighting equipment, elevators, etc. An example of a power supply system that supplies power to station facilities is disclosed in Patent Document 1. The power supply adjustment system disclosed in Patent Document 1 converts surplus regenerative power that is not consumed by traveling electric vehicles into AC power, supplies it to multiple station buildings, and adjusts the amount of power supplied to each station building. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-153191 Summary of the Invention [Problem to be solved by the invention]

[0004] The power supply adjustment system disclosed in Patent Document 1 monitors the voltage values ​​of station buildings far from substations, and adjusts the amount of power supplied to each station when a voltage drop occurs, for example, due to a sudden increase in power consumption in station facilities. However, when the power consumption at each station is low, the surplus regenerative power cannot be consumed, and therefore cannot be used effectively.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a station auxiliary power supply device and a power supply system that enable the consumption of regenerative power even when fluctuations in power consumption occur in station facilities. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure provides a station building auxiliary power supply device including: a railway power supply line that connects an electric railway vehicle and a railway substation that supplies power to the electric railway vehicle; Under the control of the railway operator, Station building equipment that consumes electricity and is installed in the station building 、 and It is under the control of a different operator than the railway operator. The station is connected to an equipment power supply line connecting a power substation located outside the station that supplies power to peripheral equipment that consumes power with the station equipment and the peripheral equipment, and includes a power conversion unit and a power conversion control unit. The power conversion unit converts regenerative power supplied from an electric railway vehicle via the railway power supply line into power to be supplied to the station equipment and the peripheral equipment, and outputs the converted power. The power conversion control unit monitors the voltage of the railway power supply line and controls the power conversion unit according to the voltage of the railway power supply line. When the output power of the power conversion unit is greater than the power consumption of the station equipment, the output power of the power conversion unit is supplied to the station equipment and the peripheral equipment via the equipment power supply line, and when the output power of the power conversion unit is equal to or less than the power consumption of the station equipment, the output power of the power conversion unit is supplied to the station equipment via the equipment power supply line. [Effects of the Invention]

[0007] The station auxiliary power supply device disclosed herein is connected to an equipment power supply line that connects a power substation with station equipment and surrounding equipment. When the output power of a power conversion unit provided in the station auxiliary power supply device is greater than the power consumption of the station equipment, the output power of the power conversion unit is supplied to the station equipment and surrounding equipment via the equipment power supply line. This makes it possible to consume regenerative power even if the power consumption of the station equipment fluctuates. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing a configuration of a power supply system according to a first embodiment. [Figure 2] A block diagram showing the hardware configuration of a station auxiliary power supply device according to the first embodiment. [Figure 3] 1 is a flowchart showing an example of a regenerative power supply operation performed by a station building auxiliary power supply device according to the first embodiment. [Figure 4]FIG. 1 is a diagram showing an example of power supply from the power supply system according to the first embodiment to station building facilities and peripheral facilities. [Figure 5] FIG. 1 is a diagram showing an example of output power of a station building auxiliary power supply device according to the first embodiment. [Figure 6] A block diagram showing the configuration of a power supply system according to a second embodiment. [Figure 7] 10 is a flowchart showing an example of a regenerative power supply operation performed by a station building auxiliary power supply device according to a second embodiment. [Figure 8] FIG. 10 is a diagram showing an example of power supply from a power supply system according to a second embodiment to station building facilities and peripheral facilities. [Figure 9] FIG. 10 is a diagram showing another example of power supply from the power supply system according to the second embodiment to station building facilities and peripheral facilities. [Figure 10] A block diagram showing the configuration of a power supply system according to a third embodiment. [Figure 11] 10 is a flowchart showing an example of a regenerative power supply operation performed by a power supply system according to a third embodiment. [Figure 12] FIG. 10 is a diagram showing an example of output power of each station building auxiliary power supply device according to the third embodiment. [Figure 13] FIG. 10 is a block diagram showing a configuration of a first modified example of a power supply system according to an embodiment. [Figure 14] FIG. 10 is a block diagram showing a configuration of a second modified example of the power supply system according to the embodiment. [Figure 15] FIG. 10 is a block diagram showing a configuration of a third modified example of the power supply system according to the embodiment. [Figure 16] FIG. 10 is a block diagram showing a modified example of the hardware configuration of a station auxiliary power supply device according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a station building auxiliary power supply device and a power supply system according to an embodiment of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are designated by the same reference numerals.

[0010] (Embodiment 1) The station building auxiliary power supply unit and power supply system according to the first embodiment will be described using as examples a station building auxiliary power supply unit and a power supply system equipped with the station building auxiliary power supply unit that receives regenerative power from a DC-powered electric railway vehicle and supplies power to station building facilities and surrounding facilities.

[0011] 1 is connected to a railway power supply line 92 that connects a railway substation 91 and a railway vehicle 93 that is an electric railway vehicle, and to an equipment power supply line 95 that connects a power substation 94 with station equipment 96 and peripheral equipment 97. The power supply system 100 converts regenerative power supplied from the railway vehicle 93 via the railway power supply line 92 into power to be supplied to the station equipment 96 and peripheral equipment 97, and outputs the converted power.

[0012] The railway substation 91 supplies DC power to the railway vehicle 93 via a railway power supply line 92. The railway vehicle 93 accelerates by driving an electric motor with the power obtained from the railway substation 91 via the railway power supply line 92. The railway vehicle 93 outputs the electric power generated by the electric motor operating as a generator during braking to the railway power supply line 92. The electric power output from the railway vehicle 93 to the railway power supply line 92 is supplied to other railway vehicles (not shown) and to a station building auxiliary power supply unit 1 provided in the power supply system 100.

[0013] The power substation 94 supplies AC power to station building facilities 96 that are installed in the station building and consume power, and to peripheral facilities 97 that are installed outside the station building and consume power. The station building facilities 96 are electrical facilities that consume power, such as air conditioning systems, lighting systems, elevators, and ticket gates, that are installed in the station building. The peripheral facilities 97 are electrical facilities that consume power, such as air conditioning systems, lighting systems, elevators, and other equipment that are installed in commercial facilities around the station, for example.

[0014] The facility power supply line 95 is a power line capable of bidirectional power transmission. Specifically, the facility power supply line 95 has a power line of a supply system for supplying power from the power substation 94 and a power line of a regeneration system for supplying power output by the power supply system 100 to peripheral equipment 97. With the above configuration, the power output by the power substation 94 is supplied to the station facility 96 and peripheral equipment 97, and the power output by the power supply system 100 flows in the direction from the station facility 96 toward the power substation 94 before being supplied to the peripheral equipment 97.

[0015] The power supply system 100 includes a station auxiliary power supply unit 1 that converts regenerative power supplied from a railway vehicle 93 via a railway power supply line 92 into power to be supplied to station equipment 96 and peripheral equipment 97, a power meter 21 that measures the amount of power flowing between a power substation 94 and the station equipment 96, and an output device 22 that acquires the amount of external supply from the station auxiliary power supply unit 1 to the peripheral equipment 97 determined by the station auxiliary power supply unit 1 and displays or transmits the acquired external supply amount to an external device.

[0016] The station auxiliary power supply unit 1 and station facilities 96 are ground facilities under the control of the railway operator, and the peripheral facilities 97 are facilities under the control of another operator, i.e., an operator other than the railway operator. By supplying power from the station auxiliary power supply unit 1 to the peripheral facilities 97 under the control of the other operator, the railway operator receives compensation from the other operator according to the amount of external supply. In other words, the railway operator can make a profit by selling surplus regenerative power to the other operator.

[0017] The station building auxiliary power supply unit 1 includes a power conversion unit 11 that converts regenerative power supplied from a railway vehicle 93 via a railway power supply line 92 into power to be supplied to station building equipment 96 and peripheral equipment 97, a power conversion control unit 12 that controls multiple switching elements possessed by the power conversion unit 11, and a supply amount determination unit 13 that calculates the external supply amount, which is the amount of power supplied from the station building auxiliary power supply unit 1 to the peripheral equipment 97.

[0018] The power conversion unit 11 has a DC (Direct Current) / DC conversion circuit 14 that converts high-voltage DC power supplied from the railway vehicle 93 into low-voltage DC power, and a DC / AC (Alternating Current) conversion circuit 15 that converts the low-voltage DC power output by the DC / DC conversion circuit 14 into AC power.

[0019] The power conversion control unit 12 monitors the voltage of the railway power supply line 92 and controls the switching elements of the DC / DC conversion circuit 14 and the DC / AC conversion circuit 15 of the power conversion unit 11 according to the voltage of the railway power supply line 92. In detail, the power conversion control unit 12 acquires a measurement value of a voltmeter (not shown) that measures the input voltage applied to the terminals of the station auxiliary power supply device 1 connected to the railway power supply line 92, and uses the acquired measurement value as the voltage of the railway power supply line 92, i.e., the overhead line voltage.

[0020] If the overhead line voltage is equal to or higher than a start voltage, for example, 1600 V, the power conversion control unit 12 controls the multiple switching elements of the power conversion unit 11 to cause the power conversion unit 11 to perform power conversion. The start voltage is, for example, the upper limit of a target range of voltage for the railway power supply line 92. The target range is determined by the minimum voltage required to supply power to the railway vehicle 93, the voltage that the railway power supply line 92 can withstand, etc. The power conversion control unit 12 stores information about the upper limit of the target range in advance.

[0021] The power conversion control unit 12 adjusts the duty ratio of the switching elements of the DC / DC conversion circuit 14 to maintain the output voltage of the DC / DC conversion circuit 14 within a target range. The station auxiliary power supply device 1 connects the facility power supply line 95 to the grid and controls the voltage and frequency or the voltage and phase to match. The power conversion control unit 12 calculates a current command value from the value of the current output by the DC / AC conversion circuit 15 and a target value for that current. The power conversion control unit 12 generates gate signals that switch each switching element of the DC / AC conversion circuit 15 on and off in accordance with the current command value, and sends the gate signals to each switching element. As described above, the power conversion control unit 12 controls the power conversion unit 11 to convert regenerative power supplied from the railway vehicle 93 into AC power to be supplied to the station facility 96 and peripheral facility 97.

[0022] When the power conversion control unit 12 starts controlling the power conversion unit 11, the supply amount determination unit 13 acquires a measured value of the amount of power flowing between the power substation 94 and the station facility 96 from the power meter 21 that measures the amount of power flowing between the power substation 94 and the station facility 96. When the output power of the power conversion unit 11 is greater than the power consumed by the station facility 96, part of the output power of the power conversion unit 11 is supplied to the peripheral facility 97 via the facility power supply line 95 that connects the power substation 94 and the peripheral facility 97. At this time, the supply amount determination unit 13 calculates the external supply amount, which is the amount of power to be supplied to the peripheral facility 97, from the amount of power flowing from the power conversion unit 11 toward the power substation 94, measured by the power meter 21.

[0023] The output device 22 acquires the external supply amount from the supply amount determination unit 13, and displays or transmits the acquired external supply amount to an external device. The external supply amount corresponds to the amount of power sold from the power supply system 100 to the peripheral equipment 97. The output device 22 transmits the external supply amount to, for example, a power management device of a railway operator. This allows the railway operator to grasp the amount of regenerative power sold.

[0024] FIG. 2 shows the hardware configuration of the control section of the station auxiliary power supply device 1 having the above configuration, in other words, the power conversion control unit 12 and the supply amount determination unit 13. The power conversion control unit 12 and the supply amount determination unit 13 each include a processor 81, a memory 82, and an interface 83. The processor 81, the memory 82, and the interface 83 are connected to each other via a bus 80. The functions of each section of the power conversion control unit 12 and the supply amount determination unit 13 are realized by software, firmware, or a combination of software and firmware. The software and firmware are written as programs and stored in the memory 82. The processor 81 reads and executes the programs stored in the memory 82 to realize the functions of each section. That is, the memory 82 stores programs for executing the processing of the power conversion control unit 12 or the processing of each section of the supply amount determination unit 13.

[0025] The memory 82 includes, for example, non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read-Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable and Programmable Read-Only Memory), magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disc), etc.

[0026] The power conversion control unit 12 is connected to the power conversion unit 11, specifically to the DC / DC conversion circuit 14 and the DC / AC conversion circuit 15, via an interface 83. The supply amount determination unit 13 is connected to the power meter 21 and the output device 22 via the interface 83. The interface 83 has an interface module that complies with one or more standards depending on the connection destination.

[0027] The regenerative power supply performed by the station building auxiliary power supply device 1 having the above configuration will be described with reference to Fig. 3. When the station building auxiliary power supply device 1 is started, it starts the processing shown in Fig. 3. At the start of the processing shown in Fig. 3, it is assumed that the power conversion unit 11 is stopped. The power conversion control unit 12 determines whether or not the operating criteria are satisfied (step S11).

[0028] In the first embodiment, the power conversion control unit 12 monitors the overhead line voltage based on the measurement value of the voltmeter and determines whether the overhead line voltage is equal to or higher than the upper limit of the target range, for example, 1600 V. If the operation criterion is not satisfied, specifically, if the overhead line voltage has not reached the upper limit of the target range (step S11; No), the power conversion control unit 12 stops the power conversion unit 11 (step S12). Stopping the power conversion unit 11 includes leaving the stopped power conversion unit 11 stopped.

[0029] While the operating criteria are not met and the power conversion unit 11 is stopped, no power is supplied from the power conversion unit 11 to the station building equipment 96 and the peripheral equipment 97. At this time, the station building equipment 96 and the peripheral equipment 97 are supplied with power from the power substation 94, as shown by the power flows FL1 and FL2 represented by dotted lines in Figure 4.

[0030] 3, when the operation criterion is satisfied, specifically, when the overhead line voltage reaches the upper limit of the target range (step S11; Yes), the power conversion control unit 12 controls the power conversion unit 11, and the power conversion unit 11 performs power conversion (step S13). In step S13, the power conversion control unit 12 controls the power conversion unit 11 in accordance with the overhead line voltage.

[0031] 5, when the overhead line voltage reaches the upper limit value V1 of the target range, the power conversion control unit 12 starts controlling the power conversion unit 11. The power conversion control unit 12 increases the output power of the power conversion unit 11 in response to an increase in the overhead line voltage. When the output power of the power conversion unit 11 reaches the upper limit power P1, the power conversion control unit 12 performs control to maintain the output power of the power conversion unit 11 at the upper limit power P1 even if the overhead line voltage increases further.

[0032] When power conversion by power conversion unit 11 starts, power is supplied from power conversion unit 11 to station building equipment 96, as shown by power flow FL3 represented by a dashed line in Fig. 4. When the output power of power conversion unit 11 increases and becomes greater than the power consumption of station building equipment 96, power is supplied from power conversion unit 11 to each of station building equipment 96 and peripheral equipment 97, as shown by power flows FL3 and FL4 represented by dashed lines in Fig. 4.

[0033] 3, the supply amount determination unit 13 determines, from the measurement value of the wattmeter 21, whether the output power of the power conversion unit 11 is greater than the power consumption of the station facility 96 (step S14). In detail, the supply amount determination unit 13 determines, from the measurement value of the wattmeter 21, whether a power flow is occurring from the power conversion unit 11 to the peripheral facility 97, as indicated by power flow FL4. If a power flow is occurring from the power conversion unit 11 to the peripheral facility 97, it can be considered that the output power of the power conversion unit 11 is greater than the power consumption of the station facility 96.

[0034] When a flow of power is occurring from the power conversion unit 11 to the peripheral equipment 97 as shown in power flow FL4, in other words, when the output power of the power conversion unit 11 is greater than the power consumption of the station building equipment 96 (step S14; Yes), the supply amount determination unit 13 determines the amount of power from the power conversion unit 11 to the peripheral equipment 97 as indicated by the measurement value of the power meter 21 as the external supply amount (step S15).

[0035] When there is no flow of power from the power conversion unit 11 to the peripheral equipment 97, in other words, when the output power of the power conversion unit 11 is less than or equal to the power consumption of the station building equipment 96 (step S14; No), the processing of step S15 is not performed.

[0036] When there is no flow of power from the power conversion unit 11 to the peripheral equipment 97 as shown in power flow FL4 (step S14; No), or when the processing of step S12 or step S15 is completed, the station building auxiliary power supply device 1 terminates the regenerative power supply processing.

[0037] While activated, the station building auxiliary power supply device 1 repeats the above-described regenerative power supply process at predetermined intervals. In step S15, the supply amount determination unit 13 calculates the external supply amount in kWh based on the amount of power in kW indicated by the measurement value of the wattmeter 21 and the repetition interval of the regenerative power supply process. As an example, the supply amount determination unit 13 calculates the external supply amount in kWh by assuming that the amount of power indicated by the measurement value of the wattmeter 21 has been output over a period corresponding to the repetition interval.

[0038] After the station building auxiliary power supply unit 1 repeats the regenerative power supply process shown in Figure 3 and power is supplied from the power conversion unit 11 to the station building equipment 96 and peripheral equipment 97, if the overhead line voltage drops and the operating criteria are no longer met (step S11; No), the power conversion control unit 12 stops the operation of the power conversion unit 11 (step S12), and the station building auxiliary power supply unit 1 stops the regenerative power supply process.

[0039] As described above, the station building auxiliary power supply device 1 according to the first embodiment supplies power to the station building equipment 96 and the peripheral equipment 97 via the equipment power supply line 95 when the output power of the power conversion unit 11 included in the station building auxiliary power supply device 1 is greater than the power consumption of the station building equipment 96. This makes it possible to consume regenerative power even if the power consumption of the station building equipment 96 fluctuates.

[0040] As described above, the station building auxiliary power supply unit 1 supplies power to the peripheral equipment 97, calculates the external supply amount, which is the amount of power supplied to the peripheral equipment 97, and sends the calculated external supply amount to the output device 22. The railway operator that manages the station building where the station building auxiliary power supply unit 1 is installed can sell power from the station building auxiliary power supply unit 1 to the peripheral equipment 97, and can obtain data indicating the external supply amount, i.e., the amount of power sold, from the output device 22.

[0041] (Embodiment 2) The configuration of the station building auxiliary power supply is not limited to the above example. A station building auxiliary power supply including a power storage device will be described in embodiment 2. In addition to the configuration of the station building auxiliary power supply 1 according to embodiment 1, the station building auxiliary power supply 2 shown in Fig. 6 includes a power storage device 16 that is charged with power supplied from a power conversion unit 11 and supplies power to the power conversion unit 11, a charge / discharge control unit 17 that switches between charging and discharging the power storage device 16, and a DC / DC conversion circuit 18 that is provided between the power storage device 16 and the power conversion unit 11.

[0042] The power storage device 16 is connected between the output terminals of the power conversion unit 11, specifically the DC / DC conversion circuit 14, via the DC / DC conversion circuit 18. When charging, the power storage device 16 is charged with DC power output by the DC / DC conversion circuit 14. When discharging, the power storage device 16 supplies DC power to the DC / AC conversion circuit 15.

[0043] The charge / discharge control unit 17 controls the charge / discharge circuit of the power storage device 16, and switches between discharging the power storage device 16 and charging the power storage device 16 with the output power of the DC / DC conversion circuit .

[0044] The DC / DC conversion circuit 18 converts the DC power output by the DC / DC conversion circuit 14 into power for charging the power storage device 16, and supplies the converted power to the power storage device 16. The DC / DC conversion circuit 18 converts the DC power discharged by the power storage device 16 into power for supplying to the DC / AC conversion circuit 15, and outputs the converted power to the DC / AC conversion circuit 15. The DC / DC conversion circuit 18 may include a contactor, specifically a DC electromagnetic contactor.

[0045] The control parts of the station building auxiliary power supply device 2, specifically the hardware configuration of the power conversion control unit 12, the supply amount determination unit 13, and the charge / discharge control unit 17, are the same as those of the station building auxiliary power supply device 1 according to the first embodiment.

[0046] The regenerative power supply performed by the station building auxiliary power supply device 2 having the above configuration will be described with reference to Fig. 7. The processing of steps S11 to S15 is the same as the regenerative power supply processing performed by the station building auxiliary power supply device 1 according to the first embodiment shown in Fig. 3.

[0047] As in the first embodiment, while the operating criteria are not satisfied and the power conversion unit 11 is stopped, power is not supplied from the power conversion unit 11 to the station building equipment 96 and the peripheral equipment 97. At this time, the station building equipment 96 and the peripheral equipment 97 are supplied with power from the power substation 94, as shown by the power flows FL1 and FL2 represented by dotted lines in Fig. 8 .

[0048] When power conversion by power conversion unit 11 starts, power is supplied from power conversion unit 11 to station facility 96, as shown by power flow FL3 represented by a dashed line in Fig. 8. When the output power of power conversion unit 11 increases and becomes greater than the power consumption of station facility 96, power is supplied from power conversion unit 11 to each of station facility 96 and peripheral facility 97, as shown by power flows FL3 and FL4 represented by dashed lines in Fig. 8.

[0049] As shown in Fig. 7, when a flow of power is occurring from the power conversion unit 11 to the peripheral equipment 97, as indicated by power flow FL4, in other words, when the output power of the power conversion unit 11 is greater than the power consumption of the station building equipment 96 (step S14; Yes), the charge / discharge control unit 17 controls the charge / discharge circuit of the power storage device 16 to charge the power storage device 16 (step S21). As a result, as indicated by power flow FL5 indicated by a dashed dotted line in Fig. 8, power is supplied to the power storage device 16 from the DC / DC conversion circuit 14 included in the power conversion unit 11 via the DC / DC conversion circuit 18. As a result, the power storage device 16 is charged with the DC power supplied from the DC / DC conversion circuit 14.

[0050] When the output power of the power conversion unit 11 is supplied to the station facility 96 and the power storage device 16 is being charged with the power supplied from the power conversion unit 11, if there is surplus power, the power conversion unit 11 supplies power to each of the station facility 96 and the peripheral facility 97, as shown by power flows FL3 and FL4. In other words, when the output power of the power conversion unit 11 is greater than the sum of the power consumed by the station facility 96 and the charging power of the power storage device 16, the power conversion unit 11 supplies power to each of the station facility 96 and the peripheral facility 97, with the power storage device 16 being charged with the power supplied from the power conversion unit 11.

[0051] 7, the supply amount determination unit 13 determines whether or not there is surplus power from the measured value of the power meter 21 (step S22). If the power storage device 16 is being charged and there is a flow of power from the power conversion unit 11 to the peripheral equipment 97, it can be determined that there is surplus power.

[0052] When the power storage device 16 is being charged, and a flow of power is occurring from the power conversion unit 11 to the peripheral equipment 97 as shown in power flow FL4, in other words, when there is surplus power (step S22; Yes), the supply amount determination unit 13 determines the amount of power supplied from the power conversion unit 11 to the peripheral equipment 97 as indicated by the measurement value of the power meter 21 as the external supply amount (step S15).

[0053] When the power storage device 16 is being charged and there is no flow of power from the power conversion unit 11 to the peripheral equipment 97, in other words, when there is no surplus power (step S22; No), the processing of step S15 is not performed.

[0054] When there is no power flow from the power conversion unit 11 to the peripheral equipment 97 as indicated by power flow FL4 (step S14; No), the charge / discharge control unit 17 determines whether or not the power storage device 16 is dischargeable (step S23). Specifically, the charge / discharge control unit 17 determines that the power storage device 16 is dischargeable if the charge rate of the power storage device 16 is sufficient to supply power to the DC / AC conversion circuit 15, for example, 20% or more. When the power storage device 16 is not dischargeable (step S23; No), the subsequent processes of steps S24 to S28 are not performed.

[0055] If the power storage device 16 is capable of discharging (step S23; Yes), the charge / discharge control unit 17 controls the charge / discharge circuit of the power storage device 16 to discharge power from the power storage device 16 (step S24). As a result, as shown by a power flow FL6 indicated by a dashed dotted line in Fig. 9, power is supplied from the power storage device 16 to the DC / AC conversion circuit 15 included in the power conversion unit 11 via the DC / DC conversion circuit 18. The DC / AC conversion circuit 15 converts the DC power supplied from the DC / DC conversion circuit 14 and the power storage device 16 into AC power and outputs the converted AC power.

[0056] When the storage device 16 is discharging, if the output power of the power conversion unit 11 is greater than the power consumption of the station building equipment 96, power is supplied from the power conversion unit 11 to each of the station building equipment 96 and the surrounding equipment 97, as shown by the power flows FL3 and FL4 represented by the dotted lines in Figure 9.

[0057] As shown in Figure 7, when the storage device 16 is discharging, a flow of power occurs from the power conversion unit 11 to the peripheral equipment 97 as shown in power flow FL4, in other words, when the output power of the power conversion unit 11 is greater than the power consumption of the station building equipment 96 (step S25; Yes), the supply amount determination unit 13 determines the amount of power supplied from the power conversion unit 11 to the peripheral equipment 97 as indicated by the measurement value of the power meter 21 as the external supply amount (step S26).

[0058] When the storage device 16 is discharging and no power flows from the power conversion unit 11 to the peripheral equipment 97, in other words, when the output power of the power conversion unit 11 is less than or equal to the power consumption of the station building equipment 96 (step S25; No), the processing of step S26 is not performed.

[0059] The charge / discharge control unit 17 determines whether the output of the power storage device 16 is equal to or lower than a lower limit (step S27). The lower limit is determined according to the output of the power storage device 16 when the remaining amount of the power storage device 16 can be considered to be an amount capable of supplying power to the DC / AC conversion circuit 15.

[0060] If the output of the power storage device 16 is equal to or lower than the lower limit (step S27; Yes), the charge / discharge control unit 17 stops discharging from the power storage device 16 (step S28).

[0061] If the output of the power storage device 16 is greater than the lower limit value (step S27; No), the process of step S28 is not performed.

[0062] When the processing of step S12, step S15, or step S27 is completed, when there is no surplus power (step S22; No), when the power storage device 16 is not dischargeable (step S23; No), or when the output of the power storage device 16 is greater than the lower limit value (step S27; No), the station building auxiliary power supply device 2 ends the regenerative power supply processing. While the station building auxiliary power supply device 2 is activated, it repeats the above processing at predetermined intervals. In steps S15 and S26, the supply amount determination unit 13 calculates the external supply amount in kWh based on the amount of power in kW indicated by the measurement value of the wattmeter 21 and the repetition interval of the above processing.

[0063] As described above, the station auxiliary power supply device 2 according to the second embodiment includes the power storage device 16, and when the output power of the power conversion unit 11 is greater than the power consumption of the station facility 96, the power storage device 16 is charged with the power supplied from the power conversion unit 11. When the output power of the power conversion unit 11 is equal to or less than the power consumption of the station facility 96, power is supplied from the power conversion unit 11 to the station facility 96 using the regenerative power supplied from the railway vehicle 93 and the power discharged from the power storage device 16. This makes it possible to consume the regenerative power even if the power consumption of the station facility 96 fluctuates. Furthermore, even when the regenerative power is low, it is possible to supply power to the station facility 96 using the power stored in the power storage device 16.

[0064] (Embodiment 3) The power supply system is not limited to the above-described examples. A power supply system including multiple station auxiliary power supplies will be described in a third embodiment. A power supply system 101 shown in FIG. 10 includes station auxiliary power supplies 3, 4, and 5 that convert regenerated power into power to be supplied to station facility 96 and peripheral facilities 97 and 98, respectively. Preferably, power supply system 101 further includes a wattmeter 21 that measures the amount of power flowing between power substation 94 and station facility 96, a wattmeter 23 that measures the amount of power flowing between power substation 94 and peripheral facility 97, and a wattmeter 24 that measures the amount of power flowing between power substation 94 and peripheral facility 98. In FIG. 10, a railway vehicle 93 is omitted to avoid complicating the illustration.

[0065] The station auxiliary power supply unit 3 is connected to a railway power supply line 92 and an equipment power supply line 95 that connects a power substation 94 and station equipment 96. The station auxiliary power supply unit 3 includes a power conversion unit 11 that has a DC / DC conversion circuit 14 that converts regenerative power supplied via the railway power supply line 92 into low-voltage DC power, and a station conversion circuit 19 that converts the low-voltage DC power supplied from the DC / DC conversion circuit 14 into AC power to be supplied to the station equipment 96.

[0066] The station building auxiliary power supply device 3 further includes a distribution ratio determination unit 20 that determines a distribution ratio in accordance with the power consumption of the station building facility 96 and the peripheral facilities 97 and 98.

[0067] The power conversion control unit 12 acquires the distribution ratio from the distribution ratio determination unit 20 and acquires the measured values ​​from the power meters 21, 23, and 24. The power conversion control unit 12 controls the power conversion unit 11 in accordance with the distribution ratio and the measured values ​​of the power meters 21, 23, and 24.

[0068] The supply amount determination unit 13 acquires output power values ​​from the station building auxiliary power supplies 4 and 5. The supply amount determination unit 13 calculates individual supply amounts indicating the amounts of power to be supplied to the peripheral facilities 97 and 98 from the acquired output power values.

[0069] The station conversion circuit 19 has a structure similar to that of the DC / AC conversion circuit 15 shown in the first embodiment. The station conversion circuit 19 converts the low-voltage DC power supplied from the DC / DC conversion circuit 14 into AC power, and supplies the converted AC power to station facilities 96 via facilities power supply lines 95.

[0070] The distribution ratio determination unit 20 determines a distribution ratio according to the power consumption of the station building facility 96 and the peripheral facilities 97, 98, and sends an upper limit power according to the determined distribution ratio to the power conversion control units 12, 42, 52. For example, the distribution ratio determination unit 20 determines the distribution ratio according to the predicted value, past average value, target value, etc. of the power consumption of the station building facility 96 and the peripheral facilities 97, 98. When the power conversion control unit 12 starts controlling the power conversion unit 11, the distribution ratio determination unit 20 sends an operation start instruction to the power conversion control units 42, 52.

[0071] The station building auxiliary power supply unit 4 has a peripheral conversion circuit 41 that converts low-voltage direct current power supplied from the DC / DC conversion circuit 14 of the power conversion unit 11 provided in the station building auxiliary power supply unit 3 into alternating current power, and a power conversion control unit 42 that controls the peripheral conversion circuit 41.

[0072] The peripheral conversion circuit 41 has the same configuration as the station conversion circuit 19, that is, the same configuration as the DC / AC conversion circuit 15 shown in the first embodiment.

[0073] The power conversion control unit 42 determines a current command value from the value of the current output by the peripheral conversion circuit 41 and a target value of the current. The power conversion control unit 42 generates gate signals that switch each switching element of the peripheral conversion circuit 41 on and off according to the current command value, and sends the gate signals to each switching element. The power conversion control unit 42 determines an output power value of the peripheral conversion circuit 41 from the value of the phase voltage output by the peripheral conversion circuit 41 and the value of the phase current output by the peripheral conversion circuit 41. The power conversion control unit 42 sends the determined output power value to the supply amount determination unit 13.

[0074] The station building auxiliary power supply unit 5 has a peripheral conversion circuit 51 that converts low-voltage direct current power supplied from the DC / DC conversion circuit 14 of the power conversion unit 11 provided in the station building auxiliary power supply unit 3 into alternating current power, and a power conversion control unit 52 that controls the peripheral conversion circuit 51.

[0075] The peripheral conversion circuit 51 has the same configuration as the station conversion circuit 19, that is, the same configuration as the DC / AC conversion circuit 15 shown in the first embodiment.

[0076] The power conversion control unit 52 determines a current command value from the value of the current output by the peripheral conversion circuit 51 and a target value of the current. The power conversion control unit 52 generates gate signals that switch each switching element of the peripheral conversion circuit 51 on and off according to the current command value, and sends the gate signals to each switching element. The power conversion control unit 52 determines an output power value of the peripheral conversion circuit 51 from the value of the phase voltage output by the peripheral conversion circuit 51 and the value of the phase current output by the peripheral conversion circuit 51. The power conversion control unit 52 sends the determined output power value to the supply amount determination unit 13.

[0077] The configuration of the power meter 21 is the same as that of the power meter 21 shown in the first embodiment. However, the power meter 21 sends a measurement value to the power conversion control unit 12. The configurations of the power meters 23 and 24 are the same as that of the power meter 21. The power meter 23 measures the amount of power flowing between the power substation 94 and the peripheral equipment 97, and sends the measurement value to the power conversion control unit 12. The power meter 24 measures the amount of power flowing between the power substation 94 and the peripheral equipment 98, and sends the measurement value to the power conversion control unit 12.

[0078] The hardware configuration of the control parts of the station building auxiliary power supplies 3, 4, and 5 is the same as that of the station building auxiliary power supply 1 according to embodiment 1. The station building auxiliary power supply 3 is connected to the station building auxiliary power supplies 4 and 5 via an interface 83. The station building auxiliary power supplies 4 and 5 are each connected to the station building auxiliary power supply 3 via an interface 83.

[0079] The regenerative power supply performed by the power supply system 101 having the above configuration will be described with reference to Fig. 11. The power supply system 101 starts the processing of Fig. 11 when the station building auxiliary power supply device 3-5 is started. At the start of the processing of Fig. 11, it is assumed that the power conversion unit 11 provided in the station building auxiliary power supply device 3 is stopped. The processing of steps S11 and S12 is the same as the regenerative power supply processing performed by the station building auxiliary power supply device 1 according to the first embodiment shown in Fig. 3.

[0080] As in the first embodiment, while the operating criteria are not met and the power conversion unit 11 is stopped, power is not supplied from the power conversion unit 11 provided in the station auxiliary power supply unit 3 to the station equipment 96, and power is not supplied from the station auxiliary power supplies 4 and 5 to the peripheral equipment 97 and 98. At this time, the station equipment 96 and the peripheral equipment 97 and 98 are supplied with power from the power substation 94, as shown by the power flows FL1, FL2, and FL7 represented by dotted lines in Figure 10.

[0081] When the operation standard is satisfied, specifically, when the overhead line voltage reaches the upper limit of the target range (step S11; Yes), the distribution ratio determination unit 20 determines the distribution ratio (step S31). The distribution ratio determination unit 20 notifies the power conversion control units 12, 42, and 52 of the upper limit power according to the determined distribution ratio.

[0082] The power conversion control unit 12 controls the power conversion unit 11 in accordance with the distribution ratio, and the power conversion unit 11 performs power conversion (step S13). In detail, the power conversion control unit 12 controls the DC / DC conversion circuit 14, as in the first embodiment. The power conversion control unit 12 controls the station conversion circuit 19 in accordance with the distribution ratio. The station conversion circuit 19 supplies power to the station facilities 96 that is equal to or less than the upper limit power according to the distribution ratio. When the power conversion control unit 12 starts controlling the power conversion unit 11, the distribution ratio determination unit 20 sends an operation start instruction to the power conversion control units 42, 52 provided in the station auxiliary power supplies 4, 5.

[0083] When power conversion by power conversion unit 11 begins, power is supplied from power conversion unit 11 to station facility 96, as shown by power flow FL3 represented by a dashed line in Fig. 10. When power conversion by peripheral conversion circuit 41 provided in station auxiliary power supply 4 begins, power is supplied from station auxiliary power supply 4 to peripheral facility 97, as shown by power flow FL4 represented by a dashed line. When power conversion by peripheral conversion circuit 51 provided in station auxiliary power supply 5 begins, power is supplied from station auxiliary power supply 5 to peripheral facility 98, as shown by power flow FL8 represented by a dashed line.

[0084] The upper limit power according to the distribution ratio is smaller than the upper limit power P1 of the output power of the station building auxiliary power supply 1 according to embodiment 1. As an example, as shown in Fig. 12, the power conversion control unit 12 included in the station building auxiliary power supply 3 controls the power conversion unit 11, so that the output power of the power conversion unit 11 gradually increases up to an upper limit power P1' which is smaller than the upper limit power P1 of the output power of the station building auxiliary power supply 1 according to embodiment 1.

[0085] When the power conversion control units 42, 52 provided in the station auxiliary power supplies 4, 5 receive the operation start instruction, they start controlling the peripheral conversion circuits 41, 51. As the power conversion control units 42, 52 control the peripheral conversion circuits 41, 51, the output power of the peripheral conversion circuits 41, 51 gradually increases, and increases to an upper limit power P2' that is lower than the upper limit power P1 of the output power of the station auxiliary power supply 1 according to the first embodiment.

[0086] As shown in FIG. 11, the supply amount determination unit 13 obtains individual supply amounts indicating the amounts of power to be supplied to the peripheral equipment 97, 98, respectively, from the output power values ​​acquired from the power conversion control units 42, 52 (step S32).

[0087] The power conversion control unit 12 determines whether the output power of each of the station auxiliary power supplies 3, 4, 5 is greater than the power consumption of the station facility 96 and the peripheral facilities 97, 98 based on the measured values ​​of the power meters 21, 23, 24 (step S33).

[0088] Specifically, the power conversion control unit 12 determines, from the measurement value of the power meter 21, whether or not there is a flow of power from the power conversion unit 11 provided in the station building auxiliary power supply 3 toward the power substation 94. If there is a flow of power from the power conversion unit 11 toward the power substation 94, it can be assumed that the output power of the station building auxiliary power supply 3 is greater than the power consumption of the station facility 96.

[0089] Similarly, the power conversion control unit 12 determines, from the measurement value of the power meter 23, whether or not there is a flow of power from the peripheral conversion circuit 41 provided in the station building auxiliary power supply 4 toward the power substation 94. If there is a flow of power from the peripheral conversion circuit 41 toward the power substation 94, it can be assumed that the output power of the station building auxiliary power supply 4 is greater than the power consumption of the peripheral equipment 97.

[0090] Similarly, the power conversion control unit 12 determines, from the measurement value of the power meter 24, whether or not there is a flow of power from the peripheral conversion circuit 51 provided in the station building auxiliary power supply 5 toward the power substation 94. If there is a flow of power from the peripheral conversion circuit 51 toward the power substation 94, it can be assumed that the output power of the station building auxiliary power supply 5 is greater than the power consumption of the peripheral equipment 98.

[0091] If the output power of station building auxiliary power supply 3 is greater than the power consumption of station building equipment 96, the output power of station building auxiliary power supply 4 is greater than the power consumption of peripheral equipment 97, or the output power of station building auxiliary power supply 5 is greater than the power consumption of peripheral equipment 98 (step S33; Yes), the power conversion control unit 12 reduces the output of one of station building auxiliary power supplies 3, 4, and 5 (step S34).

[0092] As an example, when the output power of the station auxiliary power supply 3 is greater than the power consumption of the station facility 96 and the output power of the station auxiliary power supplies 4 and 5 is less than the power consumption of the peripheral facilities 97 and 98, the power conversion control unit 12 adjusts the distribution ratio to reduce the power supplied to the station conversion circuit 19 and increase the power supplied to the peripheral conversion circuits 41 and 51. This reduces the output of the station auxiliary power supply 3 and inhibits power from being supplied from the station auxiliary power supply 3 to the power substation 94.

[0093] When the processing of step S12 or S34 is completed, or when the output power of each of the station auxiliary power supplies 3, 4, and 5 is equal to or less than the power consumption of the station facility 96 and the peripheral facilities 97 and 98 (step S33; No), the power supply system 101 ends the regenerative power supply processing. While the station auxiliary power supplies 3-5 are activated, the power supply system 101 repeats the above processing at predetermined intervals. In step S32, the supply amount determination unit 13 calculates the individual supply amount in kWh based on the amount of power in kW indicated by the acquired output power value and the repetition interval of the above processing.

[0094] As described above, the power supply system 101 according to the third embodiment includes the station auxiliary power supplies 3, 4, and 5, and can supply power to the station facility 96 and the peripheral facilities 97 and 98 using regenerative power from each of the station auxiliary power supplies 3, 4, and 5. Therefore, even when the power consumption of the station facility 96 is small, the regenerative power can be consumed by the peripheral facilities 97 and 98.

[0095] The present disclosure is not limited to the above-described embodiments. The above-described embodiments can be combined in any manner. As an example, the station auxiliary power supply device 3-5 may include a power storage device 16 and a charge / discharge control unit 17.

[0096] The configuration of the power supply systems 100, 101 is not limited to the above example, and may be any configuration as long as it can supply regenerative power to the station facility 96 and peripheral facilities 97, 98. As an example, the method of distribution to multiple station auxiliary power supplies in the power supply system 101 is not limited to the above example. The power supply system 101 shown in Fig. 13 includes station auxiliary power supplies 6, 7, and 8, each connected to a railway power supply line 92. In Fig. 13, the railcar 93 is omitted to avoid complicating the illustration.

[0097] The station auxiliary power supply device 6 has the same configuration as the station auxiliary power supply device 3. However, the power conversion unit 11 provided in the station auxiliary power supply device 6 has a DC / DC conversion circuit 14 and a station conversion circuit 19.

[0098] In addition to the components of the station auxiliary power supply 4, the station auxiliary power supply 7 includes a DC / DC conversion circuit 43 connected to a railway power supply line 92. The DC / DC conversion circuit 43 is controlled by a power conversion control unit 42 and converts regenerative power supplied from a railway vehicle 93 via the railway power supply line 92 into low-voltage DC power. The DC / DC conversion circuit 43 supplies the low-voltage DC power to a peripheral conversion circuit 41. In FIG. 13 , to avoid complicating the diagram, the arrows from the power conversion control unit 42 to the peripheral conversion circuit 41 and the DC / DC conversion circuit 43 are omitted.

[0099] In addition to the components of the station auxiliary power supply 5, the station auxiliary power supply 8 includes a DC / DC conversion circuit 53 connected to a railway power supply line 92. The DC / DC conversion circuit 53 is controlled by a power conversion control unit 52, and converts regenerative power supplied from a railway vehicle 93 via the railway power supply line 92 into low-voltage DC power. The DC / DC conversion circuit 53 supplies the low-voltage DC power to a peripheral conversion circuit 51. In FIG. 13 , to avoid complicating the diagram, the arrows from the power conversion control unit 52 to the peripheral conversion circuit 51 and the DC / DC conversion circuit 53 are omitted.

[0100] The power conversion control unit 12 controls the DC / DC conversion circuit 14 and the station conversion circuit 19 in accordance with the upper limit power corresponding to the distribution ratio acquired from the distribution ratio determination unit 20. The power conversion control unit 42 controls the DC / DC conversion circuit 43 and the periphery conversion circuit 41 in accordance with the upper limit power corresponding to the distribution ratio acquired from the distribution ratio determination unit 20. The power conversion control unit 52 controls the DC / DC conversion circuit 53 and the periphery conversion circuit 51 in accordance with the upper limit power corresponding to the distribution ratio acquired from the distribution ratio determination unit 20.

[0101] 14 , a power supply system 102 may include a station auxiliary power supply 9 including some of the components of the station auxiliary power supply 3, and ground-installed equipment 71 including a supply amount determination unit 13 and a distribution rate determination unit 20. The supply amount determination unit 13 and the distribution rate determination unit 20 included in the ground-installed equipment 71 are the same as the supply amount determination unit 13 and the distribution rate determination unit 20 included in the station auxiliary power supply 3. The power conversion control unit 12, DC / DC conversion circuit 14, and station conversion circuit 19 included in the station auxiliary power supply 9 are the same as the power conversion control unit 12, DC / DC conversion circuit 14, and station conversion circuit 19 included in the station auxiliary power supply 3. The ground-installed equipment 71 is independent of the station auxiliary power supply 9.

[0102] As another example, the station auxiliary power supplies 3, 4, and 5 may be realized by a single station auxiliary power supply 3. In this case, the station auxiliary power supply 3 may further include peripheral conversion circuits 41 and 51 and power conversion control units 42 and 52.

[0103] The operating criteria for the regenerative power supply process are not limited to the above example. As an example, the power conversion control unit 12 may determine whether the overhead line voltage is on an upward trend, and if it determines that the overhead line voltage is on an upward trend, control the power conversion unit 11 to start power conversion by the power conversion unit 11. In this case, the power conversion control unit 12 may control the power conversion unit 11 until the overhead line voltage reaches the lower limit of the target range.

[0104] The supply amount determination unit 13 included in the station building auxiliary power supply units 1 and 2 may acquire the power consumption of the station building equipment 96 from the station building equipment 96, and may determine the external supply amount from the measurement value of the power meter 21 and the power consumption of the station building equipment 96. In detail, the supply amount determination unit 13 may determine the external supply amount as a value obtained by subtracting the amount of power flowing from the power substation 94 to the station building equipment 96 from the power consumption of the station building equipment 96, and then subtracting the result from the output power of the power conversion unit 11.

[0105] As shown in FIG. 15, the power supply system 100 may be connected to a power substation 94 via a reverse power relay 99 for inhibiting the flow of power to the power substation 94 .

[0106] The number of peripheral facilities is arbitrary. As an example, the station building auxiliary power supply device 1 may supply power to a plurality of peripheral facilities via the facility power supply line 95.

[0107] The power supply systems 100, 101, 102 may be supplied with regenerative power from an AC-fed railway vehicle 93. In this case, the station auxiliary power supply device 1-9 may include a transformer that steps down high-voltage AC power and an AC / DC conversion circuit that converts the stepped-down AC power into DC power.

[0108] The hardware configuration of the control portion of the station auxiliary power supply 1-9 is not limited to the example described above. A modified example of the hardware configuration of the control portion of the station auxiliary power supply 1-9 is shown in FIG. 16. As shown in FIG. 16, the control portion of the station auxiliary power supply 1-9 may be realized by a processing circuit 84. As an example, the power conversion control unit 12 provided in the station auxiliary power supply 1 is connected to the power conversion unit 11, specifically, the DC / DC conversion circuit 14 and the DC / AC conversion circuit 15, via an interface circuit 85. The supply amount determination unit 13 provided in the station auxiliary power supply 1 is connected to the wattmeter 21 and the output device 22 via the interface circuit 85.

[0109] When the processing circuit 84 is dedicated hardware, the processing circuit 84 may include, for example, a single circuit, a composite circuit, a processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. Each part of the control portion of the station auxiliary power supply devices 1-9 may be realized by an individual processing circuit 84 or may be realized by a common processing circuit 84.

[0110] Some of the functions of the control part of the station building auxiliary power supply device 1-9 may be realized by dedicated hardware, and other parts may be realized by software or firmware. For example, in the station building auxiliary power supply device 1 according to the first embodiment, the power conversion control unit 12 may be realized by the processing circuit 84 shown in Fig. 16, and the supply amount determination unit 13 may be realized by the processor 81 shown in Fig. 2 reading and executing a program stored in the memory 82. Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) the electric railcar is connected to a railway power supply line that connects the electric railcar to a railway substation that supplies power to the electric railcar, and to an equipment power supply line that connects a power substation that supplies power to station building equipment that is provided in a station building and consumes power, and peripheral equipment that is provided outside the station building and consumes power, with the station building equipment and the peripheral equipment; a power conversion unit that converts regenerative power supplied from the electric railway vehicle via the railway power supply line into power to be supplied to the station building facilities and the peripheral facilities, and outputs the converted power; a power conversion control unit that monitors a voltage of the railway power supply line and controls the power conversion unit in accordance with the voltage of the railway power supply line, When the output power of the power conversion unit is greater than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment and the peripheral equipment via the equipment power supply line, and when the output power of the power conversion unit is equal to or less than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment via the equipment power supply line. Station building auxiliary power supply unit. (Appendix 2) further comprising a power storage device connected to the power conversion unit, When the output power of the power conversion unit is greater than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment via the equipment power supply line, and the power storage device is charged with the power supplied from the power conversion unit. Station building auxiliary power supply equipment as described in Appendix 1. (Appendix 3) When the output power of the power conversion unit is greater than the sum of the power consumed by the station building equipment and the charging power of the power storage device, the output power of the power conversion unit is supplied to the station building equipment and the peripheral equipment via the equipment power supply line, and the power storage device is charged with the power supplied from the power conversion unit. Station building auxiliary power supply equipment as described in Appendix 2. (Appendix 4) When the output power of the power conversion unit is equal to or less than the power consumption of the station building facility, the power conversion unit converts the power supplied from the power storage device into power to be supplied to the station building facility and the peripheral facility, and outputs the converted power. A station building auxiliary power supply device as described in Appendix 2 or 3. (Appendix 5) the power conversion control unit controls the power conversion unit to start power conversion when the voltage of the railway power supply line reaches an upper limit value of a target range while the power conversion unit is stopped. 5. A station building auxiliary power supply device as set forth in any one of appendices 1 to 4. (Appendix 6) the power conversion control unit determines whether or not the voltage of the railway power supply line is on an upward trend when the power conversion unit is stopped, and when determining that the voltage of the railway power supply line is on an upward trend, controls the power conversion unit to start power conversion by the power conversion unit. 5. A station building auxiliary power supply device as set forth in any one of appendices 1 to 4. (Appendix 7) The station facility further includes a supply amount determination unit that determines an external supply amount, which is the amount of power supplied to the peripheral equipment when the output power of the power conversion unit is greater than the power consumption of the station facility, from the amount of power flowing between the power substation and the station facility. 7. A station building auxiliary power supply device as set forth in any one of appendices 1 to 6. (Appendix 8) a distribution rate determination unit that determines a distribution rate for distributing the regenerative power to each of the station building facilities and the peripheral facilities; The power conversion unit a station conversion circuit that converts the regenerative power into power to be supplied to the station facility in accordance with the distribution ratio and supplies the converted power to the station facility; a peripheral conversion circuit that converts the regenerative power into power to be supplied to the peripheral equipment in accordance with the distribution ratio and supplies the converted power to the peripheral equipment, 7. A station building auxiliary power supply device as set forth in any one of appendices 1 to 6. (Appendix 9) The distribution rate determination unit determines the distribution rate based on the power consumption of the station building facilities and the peripheral facilities. Station building auxiliary power supply equipment as described in Appendix 8. (Appendix 10) a supply amount determination unit that determines an individual supply amount, which is the amount of power supplied to the peripheral equipment, from the output power value of the peripheral equipment conversion circuit; A station building auxiliary power supply unit as described in Appendix 8 or 9. (Appendix 11) a station building auxiliary power supply unit connected to a railway power supply line connecting an electric railway vehicle and a railway substation that supplies power to the electric railway vehicle, and to an equipment power supply line connecting station building equipment that is provided in a station building and consumes power, and a power substation that supplies power to peripheral equipment that is provided outside the station building and consumes power, with the station building equipment and the peripheral equipment; a power meter that measures the amount of power flowing between the power substation and the station building facility; The station building auxiliary power supply device is a power conversion unit that converts regenerative power supplied from the electric railway vehicle via the railway power supply line into power to be supplied to the station building facilities and the peripheral facilities, and outputs the converted power; a power conversion control unit that monitors a voltage of the railway power supply line and controls the power conversion unit in accordance with the voltage of the railway power supply line, When the output power of the power conversion unit is greater than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment and the peripheral equipment via the equipment power supply line, and when the output power of the power conversion unit is equal to or less than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment via the equipment power supply line. Power supply system. (Appendix 12) The station building auxiliary power supply device further includes a supply amount determination unit that determines, from the measurement value of the power meter, an external supply amount that is the amount of power to be supplied to the peripheral equipment when the output power of the power conversion unit is greater than the power consumption of the station building equipment. 12. The power supply system of claim 11. (Appendix 13) a railway power supply line connecting an electric railway vehicle and a railway substation that supplies power to the electric railway vehicle; and a plurality of station auxiliary power supplies connected to an equipment power supply line connecting station building equipment that is provided in a station building and consumes power, and a power substation that supplies power to peripheral equipment that is provided outside the station building and consumes power, with the station building equipment or the peripheral equipment; Each of the station building auxiliary power supply devices is a power conversion unit that converts regenerative power supplied from the electric railway vehicle via the railway power supply line into power to be supplied to the station building facilities or the peripheral facilities, and outputs the converted power; a power conversion control unit that monitors a voltage of the railway power supply line and controls the power conversion unit in accordance with the voltage of the railway power supply line; Power supply system. (Appendix 14) The station building auxiliary power supply device connected to the equipment power supply line connecting the power substation and the station building equipment, a distribution rate determination unit that determines a distribution rate for distributing the regenerative power to each of the station building facilities and the peripheral facilities; a station conversion circuit that converts the regenerative power into power to be supplied to the station facility in accordance with the distribution ratio and supplies the converted power to the station facility, The station building auxiliary power supply device connected to the facility power supply line connecting the power substation and the peripheral facility has a peripheral conversion circuit that converts the regenerative power into power to be supplied to the peripheral facility in accordance with the distribution rate and supplies the converted power to the peripheral facility. 14. The power supply system of claim 13. (Appendix 15) The station building auxiliary power supply device connected to the equipment power supply line connecting the power substation and the station building equipment, a distribution rate determination unit that determines a distribution rate for distributing the regenerative power to each of the station building facilities and the peripheral facilities; each of the station building auxiliary power supply devices is connected to the railway power supply line; The power conversion control unit included in each of the station building auxiliary power supply devices controls the power conversion unit according to the distribution ratio. 14. The power supply system of claim 13. (Appendix 16) Further provided is a plurality of power meters for measuring the amount of power flowing between the power substation and the station facility or the peripheral facility; At least one of the station building auxiliary power supply devices further includes a supply amount determination unit that determines an individual supply amount, which is the amount of power supplied to each of the peripheral facilities, from the measured values ​​of each of the power meters. 16. The power supply system of any one of appendixes 13 to 15. (Appendix 17) an output device that acquires the individual supply amounts determined by the supply amount determination unit and displays or outputs the acquired individual supply amounts to an external device; 17. The power supply system of claim 16.

[0111] The present disclosure allows various embodiments and modifications without departing from the broad spirit and scope of the present disclosure. Furthermore, the above-described embodiments are intended to illustrate the present disclosure and do not limit the scope of the present disclosure. That is, the scope of the present disclosure is defined by the claims, not the embodiments. Various modifications made within the scope of the claims and the meaning of equivalent disclosures are considered to be within the scope of the present disclosure. [Explanation of symbols]

[0112] 1,2,3,4,5,6,7,8,9 Station auxiliary power supply unit, 11 Power conversion unit, 12,42,52 Power conversion control unit, 13 Supply amount determination unit, 14,18,43,53 DC / DC conversion circuit, 15 DC / AC conversion circuit, 16 Power storage device, 17 Charge / discharge control unit, 19 Station conversion circuit, 20 Distribution rate determination unit, 21,23,24 Wattmeter, 22 Output device, 41,51 Peripheral conversion circuit, 71 Ground-mounted equipment, 80 Bus, 81 Processor, 82 Memory, 83 Interface, 84 Processing circuit, 85 Interface circuit, 91 Railway substation, 92 Railway power supply line, 93 Railway vehicle, 94 Power substation, 95 Equipment power supply line, 96 Station facility, 97,98 Peripheral facility, 99 Reverse power relay, 100,101,102 power supply system, MC1 contactor.

Claims

1. the electric railcar is connected to a railway power supply line that connects a railway substation that supplies power to the electric railcar, and to station building facilities that are under the control of a railway operator and are installed in a station building to consume power, and to a power substation that is under the control of an operator different from the railway operator and is installed outside the station building to supply power to peripheral facilities that consume power, and to an equipment power supply line that connects the station building facilities and the peripheral facilities, a power conversion unit that converts regenerative power supplied from the electric railway vehicle via the railway power supply line into power to be supplied to the station building facilities and the peripheral facilities, and outputs the converted power; a power conversion control unit that monitors a voltage of the railway power supply line and controls the power conversion unit in accordance with the voltage of the railway power supply line, When the output power of the power conversion unit is greater than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment and the peripheral equipment via the equipment power supply line, and when the output power of the power conversion unit is equal to or less than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment via the equipment power supply line. Station building auxiliary power supply unit.

2. further comprising a power storage device connected to the power conversion unit, When the output power of the power conversion unit is greater than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment via the equipment power supply line, and the power storage device is charged with the power supplied from the power conversion unit. The station building auxiliary power supply device according to claim 1.

3. When the output power of the power conversion unit is greater than the sum of the power consumed by the station building equipment and the charging power of the power storage device, the output power of the power conversion unit is supplied to the station building equipment and the peripheral equipment via the equipment power supply line, and the power storage device is charged with the power supplied from the power conversion unit. The station building auxiliary power supply device according to claim 2.

4. When the output power of the power conversion unit is equal to or less than the power consumption of the station building facility, the power conversion unit converts the power supplied from the power storage device into power to be supplied to the station building facility and the peripheral facility, and outputs the converted power.

4. The station building auxiliary power supply device according to claim 2 or 3.

5. the power conversion control unit controls the power conversion unit to start power conversion when the voltage of the railway power supply line reaches an upper limit value of a target range while the power conversion unit is stopped. The station building auxiliary power supply device according to any one of claims 1 to 3.

6. the power conversion control unit determines whether or not the voltage of the railway power supply line is on an upward trend when the power conversion unit is stopped, and when determining that the voltage of the railway power supply line is on an upward trend, controls the power conversion unit to start power conversion by the power conversion unit. The station building auxiliary power supply device according to any one of claims 1 to 3.

7. The station facility further includes a supply amount determination unit that determines an external supply amount, which is the amount of power supplied to the peripheral equipment when the output power of the power conversion unit is greater than the power consumption of the station facility, from the amount of power flowing between the power substation and the station facility. The station building auxiliary power supply device according to any one of claims 1 to 3.

8. a distribution rate determination unit that determines a distribution rate for distributing the regenerative power to each of the station building facilities and the peripheral facilities; The power conversion unit a station conversion circuit that converts the regenerative power into power to be supplied to the station facility in accordance with the distribution ratio and supplies the converted power to the station facility; a peripheral conversion circuit that converts the regenerative power into power to be supplied to the peripheral equipment in accordance with the distribution ratio and supplies the converted power to the peripheral equipment, The station building auxiliary power supply device according to any one of claims 1 to 3.

9. The distribution rate determination unit determines the distribution rate based on the power consumption of the station building facilities and the peripheral facilities. The station building auxiliary power supply device according to claim 8.

10. a supply amount determination unit that determines an individual supply amount, which is the amount of power supplied to the peripheral equipment, from the output power value of the peripheral equipment conversion circuit; The station building auxiliary power supply device according to claim 8.

11. a railway power supply line connecting an electric railway vehicle and a railway substation that supplies power to the electric railway vehicle; and a station building auxiliary power supply unit connected to an equipment power supply line connecting station building facilities that are under the control of a railway operator and installed in a station building to consume power, and a power substation that supplies power to peripheral facilities that are under the control of an operator different from the railway operator and installed outside the station building to the station building facilities and the peripheral facilities; a power meter that measures the amount of power flowing between the power substation and the station building facility; The station building auxiliary power supply device is a power conversion unit that converts regenerative power supplied from the electric railway vehicle via the railway power supply line into power to be supplied to the station building facilities and the peripheral facilities, and outputs the converted power; a power conversion control unit that monitors a voltage of the railway power supply line and controls the power conversion unit in accordance with the voltage of the railway power supply line, When the output power of the power conversion unit is greater than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment and the peripheral equipment via the equipment power supply line, and when the output power of the power conversion unit is equal to or less than the power consumption of the station building equipment, the output power of the power conversion unit is supplied to the station building equipment via the equipment power supply line. Power supply system.

12. The station building auxiliary power supply device further includes a supply amount determination unit that determines, from the measurement value of the power meter, an external supply amount that is the amount of power to be supplied to the peripheral equipment when the output power of the power conversion unit is greater than the power consumption of the station building equipment. The power supply system according to claim 11.

13. a railway power supply line connecting an electric railway vehicle and a railway substation that supplies power to the electric railway vehicle; and a plurality of station auxiliary power supplies connected to an equipment power supply line connecting station building facilities that are under the control of a railway operator and are installed in a station building to consume power, and a power substation that is under the control of an operator different from the railway operator and is installed outside the station building to supply power to peripheral facilities that consume power, with the station building facilities or the peripheral facilities; Each of the station building auxiliary power supply devices is a power conversion unit that converts regenerative power supplied from the electric railway vehicle via the railway power supply line into power to be supplied to the station building facilities or the peripheral facilities, and outputs the converted power; a power conversion control unit that monitors a voltage of the railway power supply line and controls the power conversion unit in accordance with the voltage of the railway power supply line; Power supply system.

14. The station building auxiliary power supply device connected to the equipment power supply line connecting the power substation and the station building equipment, a distribution rate determination unit that determines a distribution rate for distributing the regenerative power to each of the station building facilities and the peripheral facilities; a station conversion circuit that converts the regenerative power into power to be supplied to the station facility in accordance with the distribution ratio and supplies the converted power to the station facility, The station building auxiliary power supply device connected to the facility power supply line connecting the power substation and the peripheral facility has a peripheral conversion circuit that converts the regenerative power into power to be supplied to the peripheral facility in accordance with the distribution rate and supplies the converted power to the peripheral facility. The power supply system according to claim 13.

15. The station building auxiliary power supply device connected to the equipment power supply line connecting the power substation and the station building equipment, a distribution rate determination unit that determines a distribution rate for distributing the regenerative power to each of the station building facilities and the peripheral facilities; each of the station building auxiliary power supply devices is connected to the railway power supply line; The power conversion control unit included in each of the station building auxiliary power supply devices controls the power conversion unit according to the distribution ratio. The power supply system according to claim 13.

16. Further provided is a plurality of power meters for measuring the amount of power flowing between the power substation and the station facility or the peripheral facility; At least one of the station building auxiliary power supply devices further includes a supply amount determination unit that determines an individual supply amount, which is the amount of power supplied to each of the peripheral facilities, from the measured values ​​of each of the power meters.

16. The power supply system according to any one of claims 13 to 15.

17. an output device that acquires the individual supply amounts determined by the supply amount determination unit and displays or outputs the acquired individual supply amounts to an external device; 17. The power supply system according to claim 16.

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