Station building auxiliary power supply device

Abstract

A station building auxiliary power supply device (1) comprises: a power conversion unit (11) that is electrically connected to a contact wire (2), which supplies electric power to a railway vehicle (4), that is electrically connected to a power distribution line (103), to which a load (6) is connected, and that is capable of bidirectional conversion between first power, which is for the contact wire (2), and second power, which can be supplied to the load (6); an output mode setting unit (15) that sets, on the basis of whether or not the contact wire is in a power shortage state, an output mode indicating the direction in which the power conversion unit (11) outputs electric power; and a power conversion control unit (16) that controls the power conversion unit (11) according to the output mode set by the output mode setting unit (15), wherein when the contact wire is in a power shortage state, the output mode setting unit (15) sets the output mode to an emergency mode, in which the power conversion unit (11) converts the second power into the first power and supplies the converted first power to the contact wire (2).

Description

Station building auxiliary power supply unit

[0001] The present disclosure relates to a station auxiliary power supply device.

[0002] Railway vehicles can run by receiving power from overhead lines. However, if the equipment that supplies power to the overhead lines, such as electric railway feeder equipment, breaks down, power is not supplied to the overhead lines, causing a power shortage and leaving the railway vehicles stranded. Therefore, there is a need to supply power to the overhead lines even when there is a power shortage, so that railway vehicles can move to the nearest station or other location.

[0003] Patent Document 1 discloses a technology that allows railway vehicles to continue running even when power to the overhead line is lost, by charging a storage battery electrically connected to the overhead line with regenerative power generated when the railway vehicle decelerates under normal conditions, and supplying the power stored in the storage battery to the overhead line when power to the overhead line is lost.

[0004] JP 2016-68741 A

[0005] However, in the technology described in Patent Document 1, whether or not the battery can supply power to the overhead line when the overhead line is in a power shortage state depends on the charge state of the battery. Therefore, when the power stored in the battery is insufficient, there is a problem in that power cannot be supplied to the overhead line.

[0006] The present disclosure has been made in consideration of the above, and aims to provide a station building auxiliary power supply device that can stably supply power to an overhead line when the overhead line is in a power shortage state.

[0007] In order to solve the above-mentioned problems and achieve the objectives, the station building auxiliary power supply device disclosed herein is electrically connected to an overhead line that supplies power to railway vehicles and to a distribution line of a commercial system to which a load is connected, and includes a power conversion unit that is capable of bidirectionally converting a first power that is the power of the overhead line and a second power that is the power that can be supplied to the load, an output mode setting unit that sets the output mode of the power conversion unit based on notification of overhead line abnormality information that indicates a power shortage state of the overhead line, and a power conversion control unit that controls the power conversion unit in accordance with the output mode set by the output mode setting unit, and when notification of overhead line abnormality information is received, the output mode setting unit sets an emergency mode, which is an output mode in which the power conversion unit converts the second power to a first power and supplies the converted first power to the overhead line.

[0008] The station building auxiliary power supply device according to the present disclosure has the effect of being able to stably supply power to the overhead line when the overhead line is in a power shortage state.

[0009] 1 is a diagram showing an application example of a station building auxiliary power supply device according to embodiment 1. FIG. 2 is a diagram showing an example of a power shortage state of an overhead line according to embodiment 1. FIG. 3 is a diagram showing an example of the configuration of a station building auxiliary power supply device according to embodiment 1. A flowchart showing the operation of a control unit of a station building auxiliary power supply device according to embodiment 1. FIG. 4 is a diagram showing an example of the configuration of a station building auxiliary power supply device according to embodiment 2. FIG. 5 is a diagram showing an example of the configuration of a station building auxiliary power supply device according to embodiment 3. A flowchart showing the operation of a control unit of a station building auxiliary power supply device according to embodiment 3. A diagram showing an example where the processing circuit provided in the control unit of the station building auxiliary power supply device according to embodiment 1 is realized by a processor and memory. A diagram showing an example where the processing circuit provided in the control unit of the station building auxiliary power supply device according to embodiment 1 is configured by dedicated hardware.

[0010] An embodiment of a station auxiliary power supply device according to the present disclosure will be described below with reference to the drawings. Note that the present invention is not limited to this embodiment. In the description, the term "railroad vehicle" may be abbreviated to "vehicle." In each drawing, components having the same or equivalent functions are designated by the same reference numerals.

[0011] Embodiment 1. Figure 1 is a diagram showing an application example of a station building auxiliary power supply device 1 according to embodiment 1. The arrows in Figure 1 indicate the direction of power supply during normal operation. The station building auxiliary power supply device 1 according to embodiment 1 includes a power conversion unit 11 and a control unit 12. The power conversion unit 11 converts high-voltage DC power (e.g., DC 1500V) supplied from the overhead line 2 into low-voltage AC power (e.g., AC 210V), and outputs the converted AC power to a distribution line 103 of a commercial system. In the following description, the distribution line 103 of the commercial system is referred to as the commercial system 103. The control unit 12 controls the power conversion unit 11.

[0012] The substation 100 transforms the power transmitted from the power plant and supplies the transformed power to each distribution line. The substation 100 includes a feeder line facility 101, which converts input power into power to be supplied to the overhead line 2 and outputs it. The feeder line facility 101 includes a notification unit 17 that notifies of an abnormality such as a failure of the feeder line facility 101. The feeder line facility 101 stops the power supply to the overhead line 2 in the event of an abnormality such as a failure.

[0013] The overhead line 2 is supplied with high-voltage DC power from the feeder line equipment 101 of the substation 100. In addition, regenerative power obtained by the regenerative operation of the vehicle 4 is supplied to the overhead line 2 from the vehicle 4 via the current collector 3. Note that although the overhead line 2 is described as an example in this disclosure, the overhead line 2 may also be a third rail. The current collector 3 is, for example, a pantograph or a current collector shoe. The station building auxiliary power supply 1 is electrically connected to the overhead line 2 and is supplied with high-voltage DC power from the overhead line 2. In this disclosure, the power on the overhead line 2 side of the station building auxiliary power supply 1 is referred to as the first power.

[0014] The substation 100 supplies high-voltage AC power (for example, AC 6600V system) to a high-voltage AC distribution line 102. In the present disclosure, the high-voltage AC distribution line 102 is a distribution line separate from the overhead line 2. The station building 5 includes a station building auxiliary power supply unit 1, loads 6-1, 6-2, ..., 6-n (hereinafter referred to as "loads 6"), and a transformer 7 installed in a station electrical room or the like (not shown).

[0015] The load 6 is, for example, various electrical equipment installed in a station, such as lighting equipment, air conditioning equipment, display devices, elevators, escalators, or platform doors. However, the load 6 is not limited to these, and may also be a charging station, or electrical equipment in commercial facilities around the station, in the station building, or in an underground shopping mall.

[0016] The transformer 7 is connected between the high-voltage AC distribution line 102 and the commercial grid 103, transforms the high-voltage AC power of the high-voltage AC distribution line 102 into low-voltage AC power, which is power of the commercial grid 103, and outputs the transformed AC power to the commercial grid 103. The low-voltage AC power output from the transformer 7 is supplied to the load 6 via the commercial grid 103. In the present disclosure, the low-voltage AC power that can be supplied to the load 6 connected to the commercial grid 103 is referred to as second power.

[0017] The secondary side of the station building auxiliary power supply device 1, which is the load 6 side, is electrically connected to the load 6 by a commercial power system 103. A second power is supplied to the load 6 from the secondary side of the station building auxiliary power supply device 1 or from a transformer 7. The commercial power system 103 is a power distribution line that supplies commercial power, which has a voltage lower than the voltage of the high-voltage AC power supplied to the high-voltage AC distribution line 102 and the voltage of the overhead line 2.

[0018] The station building auxiliary power supply unit 1 is electrically connected between the overhead line 2 and the load 6, and the station building auxiliary power supply unit 1 and the load 6 are connected to a commercial grid 103. A connection point A is provided on the commercial grid 103 that connects the station building auxiliary power supply unit 1 and the load 6. Connection point A and the high-voltage AC distribution line 102 are connected via a transformer 7. In other words, the secondary side of the station building auxiliary power supply unit 1 is electrically connected to connection point A on the commercial grid 103 that connects the load 6 and the transformer 7.

[0019] Under normal circumstances, the station building auxiliary power supply unit 1 converts first power supplied from the overhead line 2 into second power that can be supplied to the load 6, and supplies the converted second power to the load 6 in the station building 5. Note that normal operation does not need to be performed all the time, and control of the station building auxiliary power supply unit 1 may be put on standby or stopped. For example, when regenerative power from the car 4 is not consumed by powering other cars, etc., and becomes surplus regenerative power, the power conversion unit 11 of the station building auxiliary power supply unit 1 operates to supply the surplus regenerative power to the station building 5. The load 6 can effectively utilize not only the second power supplied from the high-voltage AC distribution line 102 via the transformer 7, but also the surplus regenerative power of the car 4 converted into the second power by the station building auxiliary power supply unit 1.

[0020] 2 is a diagram illustrating an example of a power shortage state of the overhead line according to the first embodiment. The arrow in FIG. 2 indicates the direction of power supply in an emergency. Detailed operation will be described later, but in the present disclosure, for example, when the feeder line equipment 101 fails and power is no longer supplied from the feeder line equipment 101 to the overhead line 2, that is, when an emergency occurs and the overhead line is in a power shortage state, the station building auxiliary power supply device 1 converts the second power supplied from the commercial grid 103 into the first power and supplies the converted first power to the overhead line 2.

[0021] 3 is a diagram showing an example of the configuration of a station building auxiliary power supply device 1 according to the first embodiment. The station building auxiliary power supply device 1 includes a power conversion unit 11 and a control unit 12 that controls the power conversion unit 11. The primary side of the power conversion unit 11 is connected to the overhead line 2, and the secondary side of the power conversion unit 11 is connected to a connection point A on a commercial grid 103 that connects a transformer 7 and a load 6. The power conversion unit 11 includes a first power conversion unit 13 and a transformer 14. Overhead line abnormality information is sent to the control unit 12 from a notification unit 17.

[0022] The first power conversion unit 13 in the first embodiment has a plurality of switching elements (not shown), and performs bidirectional DC / AC power conversion between the overhead line 2 and the transformer 14 by controlling each of the plurality of switching elements by the control unit 12. Specifically, the first power conversion unit 13 is, for example, an inverter capable of bidirectional DC / AC power conversion. Under normal circumstances, the first power conversion unit 13 converts DC power input from the overhead line 2 into AC power and outputs the converted AC power to the transformer 14. Under emergency circumstances, the first power conversion unit 13 converts AC power input from the transformer 14 into DC power and outputs the converted DC power to the overhead line 2.

[0023] One end of the transformer 14 is connected to the first power conversion unit 13, and the other end is connected to connection point A of the commercial grid 103, and the transformer 14 transforms and outputs the voltage of the power input to the transformer 14. Specifically, under normal circumstances, the transformer 14 steps down the voltage of the AC power output from the first power conversion unit 13 to a voltage that can be supplied to the load 6, and outputs the stepped-down low-voltage AC power to the commercial grid 103. Under emergency circumstances, the transformer 14 boosts the voltage of the low-voltage AC power that is the second power input from the commercial grid 103, and outputs the boosted AC power to the first power conversion unit 13.

[0024] The control unit 12 includes an output mode setting unit 15 and a power conversion control unit 16. The control unit 12 sets an output mode to switch the output direction of the power conversion unit 11, and controls the turning on / off of a plurality of switching elements included in the first power conversion unit 13 according to the set output mode.

[0025] The output mode setting unit 15 receives overhead line abnormality information indicating a power shortage state of the overhead line 2 from the notification unit 17. The output mode setting unit 15 sets an output mode based on the overhead line abnormality information indicating a power shortage state of the overhead line 2. The output mode indicates the direction in which the power conversion unit 11 of the auxiliary power supply 1 outputs power, and includes a normal mode and an emergency mode. The normal mode is a mode in normal times when the overhead line 2 is not in a power shortage state, in which the power conversion unit 11 converts power input from the overhead line 2 and outputs it to the commercial grid 103 side. The emergency mode is a mode in emergency times when the overhead line 2 is in a power shortage state, in which the power conversion unit 11 converts power input from the commercial grid 103 side and outputs it to the overhead line 2 side. The output mode setting unit 15 sets the output mode to the emergency mode when the overhead line 2 is in a power shortage state, and to the normal mode when the overhead line 2 is not in a power shortage state.

[0026] The power conversion control unit 16 controls the power conversion unit 11 in accordance with the setting of the output mode setting unit 15. When the setting of the output mode setting unit 15 is the emergency mode, the power conversion control unit 16 controls the power conversion unit 11, such as the switching elements, to convert the second power of the commercial grid 103 into the first power to be supplied to the overhead line 2. When the setting of the output mode setting unit 15 is the normal mode, the power conversion control unit 16 controls the power conversion unit 11, such as the switching elements, to convert the first power of the overhead line 2 into the second power that can be supplied to the load 6.

[0027] The notification unit 17 sends the overhead line abnormality information to the control unit 12. In FIG. 1 , the notification unit 17 is provided in the feeder line facility 101, but it may also be provided in the vehicle 4, the wayside facility, or the like. The overhead line abnormality information is information indicating a state in which the vehicle 4 cannot run due to a drop in voltage in the overhead line 2, that is, a power shortage state in the overhead line 2, such as power outage information in the overhead line 2, stop information in the feeder line facility 101, or voltage drop information in the overhead line 2. Note that the overhead line abnormality information notified from the notification unit 17 to the control unit 12 may be notified by a person, such as a driver or an operator, manually pressing a switch or a button on a screen, or may be notified by a mechanical decision in the feeder line facility 101, the vehicle 4, or the wayside facility.

[0028] Next, a description will be given using a flowchart of the operation of the control unit 12 of the station building auxiliary power supply device 1. Fig. 4 is a flowchart showing the operation of the control unit 12 of the station building auxiliary power supply device 1 according to the first embodiment.

[0029] The output mode setting unit 15 of the control unit 12 determines whether the overhead line 2 is in a power shortage state (step S1). In the first embodiment, the output mode setting unit 15 determines whether the overhead line 2 is in a power shortage state based on the overhead line abnormality information sent from the notification unit 17. If the overhead line 2 is in a power shortage state (step S1: Yes), the output mode setting unit 15 sets the output mode to an emergency mode in which the power conversion unit 11 converts the second power input from the commercial grid 103 into first power that can be supplied to the overhead line 2 and outputs the first power to the overhead line 2 (step S2). Then, the power conversion control unit 16 controls the power conversion unit 11 in accordance with the emergency mode, which is the output mode set by the output mode setting unit 15 (step S3). As a result, as shown by the arrow in FIG. 2 , the control unit 12 of the station building auxiliary power supply device 1 controls the power conversion unit 11 to convert the second power input from the commercial grid 103 into first power that can be supplied to the overhead line 2, and the power conversion unit 11 outputs the first power converted from the second power to the overhead line 2.

[0030] Furthermore, if the overhead line 2 is not in a power shortage state (step S1: No), the output mode setting unit 15 sets the output mode to a normal mode in which the power conversion unit 11 converts the first power input from the overhead line 2 into second power that can be supplied to the load 6 and outputs the second power to the commercial grid 103 side (step S4). Then, the power conversion control unit 16 controls the power conversion unit 11 in accordance with the normal mode, which is the output mode set by the output mode setting unit 15 (step S3). As a result, as shown by the arrow in Fig. 1 , the control unit 12 of the station building auxiliary power supply device 1 controls the power conversion unit 11 to convert the first power input from the overhead line 2 into second power that can be supplied to the load 6, and the power conversion unit 11 outputs the second power converted from the first power to the load 6 on the commercial grid 103 side.

[0031] As described above, according to this embodiment, when the overhead line 2 is in a power shortage state, the station building auxiliary power supply unit 1 sets the emergency mode, converts the second power that is the power of the commercial grid 103 into the first power that is the power of the overhead line 2, and outputs the converted first power to the overhead line 2. According to the station building auxiliary power supply unit 1 of embodiment 1, when the overhead line 2 is in a power shortage state, it is possible to supply DC power from the commercial grid 103 to the overhead line 2 via the station building auxiliary power supply unit 1, and it is possible to stably supply power to the overhead line 2 regardless of whether the storage battery is charged. As a result, the power shortage state of the overhead line 2 is resolved, and the vehicle 4 can run.

[0032] The station building auxiliary power supply unit 1 of this embodiment normally supplies regenerative power from the cars 4 to the loads 6 of the station building 5 as power for the loads 6, thereby utilizing surplus regenerative power for the loads 6, and in an emergency, it is possible to stably supply power from the commercial grid 103 to the overhead lines 2 as power for the overhead lines 2, thereby improving the operating efficiency of the station building auxiliary power supply unit 1. Furthermore, because the station building auxiliary power supply unit 1 of this embodiment can realize the function of utilizing surplus regenerative power from the cars 4 and the function of providing an emergency power supply for the overhead lines 2 in a single device, there is no need to provide separate equipment, which also leads to a reduction in equipment space and equipment costs.

[0033] Second Embodiment In the second embodiment, a case will be described in which the power supplied to the overhead line 2 is AC power. Explanations of content overlapping with the first embodiment will be omitted where appropriate, and only differences will be described. High-voltage AC power (e.g., AC 20,000 V) is supplied to the overhead line 2 from a feeder line facility 101 in a substation 100. The station building auxiliary power supply unit 1a is electrically connected to the overhead line 2. Under normal circumstances, AC power, which is the first power, is input from the overhead line 2 to the station building auxiliary power supply unit 1a. Although not shown in the figure, when the power supplied to the overhead line 2 is AC power, a transformer is provided between the overhead line 2 and the station building auxiliary power supply unit 1a. The high-voltage AC power is stepped down by this transformer, and the stepped-down AC power is input to the station building auxiliary power supply unit 1a. This transformer may be provided within the station building auxiliary power supply unit 1a or may be provided separately from the station building auxiliary power supply unit 1a.

[0034] 5 is a diagram showing an example of the configuration of a station building auxiliary power supply unit 1a according to embodiment 2. The station building auxiliary power supply unit 1a includes a power conversion unit 11a and a control unit 12a that controls the power conversion unit 11a. The primary side of the power conversion unit 11a is connected to the overhead line 2, and the secondary side of the power conversion unit 11a is connected to a connection point A on a commercial grid 103 that connects a transformer 7 and a load 6. The power conversion unit 11a includes a second power conversion unit 18, a first power conversion unit 13, and a transformer 14. Overhead line abnormality information is sent to the control unit 12a from a notification unit 17.

[0035] The second power conversion unit 18 in the second embodiment is connected between the overhead line 2 and the first power conversion unit 13, has a plurality of switching elements (not shown), and performs AC / DC power conversion bidirectionally between the overhead line 2 and the first power conversion unit 13 by controlling each of the plurality of switching elements by the control unit 12a. For example, the second power conversion unit 18 is a converter capable of bidirectional AC / DC power conversion.

[0036] The first power conversion unit 13 in the second embodiment is connected between the second power conversion unit 18 and the transformer 14, and performs DC / AC power conversion in both directions between the second power conversion unit 18 and the transformer 14 by controlling a plurality of switching elements, respectively, by the control unit 12 a.

[0037] The control unit 12a includes an output mode setting unit 15 and a power conversion control unit 16a. The control unit 12a sets the output mode of the power conversion unit 11a based on whether or not the notification unit 17 has notified the user of the overhead line abnormality information, and controls the power conversion unit 11a in accordance with the set output mode.

[0038] The power conversion control unit 16 a controls a plurality of switching elements included in the first power conversion unit 13 and the second power conversion unit 18 in accordance with the setting of the output mode setting unit 15 .

[0039] When the normal mode is set, the power conversion control unit 16a converts AC power input from the overhead line 2 into DC power and controls the second power conversion unit 18 to output the converted DC power to the first power conversion unit 13. Then, the power conversion control unit 16a converts DC power output from the second power conversion unit 18 into AC power and controls the first power conversion unit 13 to output the converted AC power to the transformer 14.

[0040] When the emergency mode is set, the power conversion control unit 16a converts AC power input from the commercial grid 103 via the transformer 14 into DC power, and controls the first power conversion unit 13 to output the converted DC power to the second power conversion unit 18. Then, the power conversion control unit 16a converts DC power output from the first power conversion unit 13 into AC power, and controls the second power conversion unit 18 to output the converted AC power to the overhead line 2.

[0041] The operation of the control unit 12a of the station building auxiliary power supply device 1a according to the second embodiment is the same as that of the first embodiment shown in FIG.

[0042] As described above, this embodiment has shown an example of the configuration of the station building auxiliary power supply unit 1a when the power supplied to the overhead line 2 is AC power. As in the first embodiment, when overhead line abnormality information indicating that the overhead line 2, which is an AC overhead line, is in a power shortage state is received, the station building auxiliary power supply unit 1a enters an emergency mode, converts the second power, which is power from the commercial grid 103, into the first power, which is power for the overhead line 2, and outputs the converted first power to the overhead line 2. According to the station building auxiliary power supply unit 1a of the second embodiment, when the overhead line 2 experiences a power shortage state due to a failure of the feeder line equipment that supplies AC power to the overhead line 2, AC power can be supplied from the commercial grid 103 to the overhead line 2 via the station building auxiliary power supply unit 1a, thereby enabling a stable power supply to the overhead line 2 regardless of whether the storage battery is charged. As a result, the power shortage state of the overhead line 2 is resolved, allowing the vehicle 4 to run.

[0043] Embodiment 3 In embodiment 3, a case will be described in which the station building auxiliary power supply unit 1b determines whether there is an abnormality in the overhead line 2. Descriptions of content that overlaps with embodiments 1 and 2 will be omitted as appropriate, and only differences will be described. Note that the power of the overhead line 2 is assumed to be DC power or AC power.

[0044] 6 is a diagram showing an example of the configuration of a control unit 12b of a station building auxiliary power supply device 1b according to embodiment 3. The control unit 12b includes an overhead line abnormality determination unit 19 in addition to an output mode setting unit 15 and a power conversion control unit 16.

[0045] The overhead line abnormality determination unit 19 acquires the overhead line voltage measured by a voltage sensor 20 that measures the voltage of the overhead line 2, and determines whether or not the overhead line 2 is in a power shortage state based on the overhead line voltage. A storage unit (not shown) stores a voltage threshold value for determining whether or not the overhead line 2 is in a power shortage state. The overhead line abnormality determination unit 19 sends the determination result to the output mode setting unit 15.

[0046] The voltage sensor 20 is installed on the overhead line 2 or on the overhead line 2 side of the station auxiliary power supply device 1b, and measures the overhead line voltage, which is the voltage value between the overhead line 2 and a rail (not shown).

[0047] 7 is a flowchart showing the operation of the control unit 12b of the station building auxiliary power supply device 1b according to embodiment 3. The operation of the station building auxiliary power supply device 1b according to embodiment 3 will be described using a flowchart.

[0048] The overhead line abnormality determination unit 19 of the station building auxiliary power supply unit 1b acquires the overhead line voltage from the voltage sensor 20 (step S5). Based on the overhead line voltage acquired from the voltage sensor 20, the overhead line abnormality determination unit 19 determines whether the overhead line voltage is equal to or lower than a threshold value (step S6). If the overhead line voltage is equal to or lower than the threshold value (step S6: Yes), the output mode setting unit 15 determines that the overhead line 2 is in a power shortage state and sets the output mode to the emergency mode (step S2). If the overhead line voltage is not equal to or lower than the threshold value (step S6: No), the output mode setting unit 15 determines that the overhead line 2 is not in a power shortage state and sets the output mode to the normal mode (step S4). The operation of step S3 is the same as in the first and second embodiments, and therefore will not be described here.

[0049] As described above, in this embodiment, the station building auxiliary power supply unit 1b is configured to determine whether the overhead line 2 is in a power shortage state using the overhead line abnormality determination unit 19. According to the station building auxiliary power supply unit 1b of embodiment 3, even if the communication means of the notification unit 17 is cut off, for example, the station building auxiliary power supply unit 1b itself can determine the power shortage state of the overhead line 2. This enables the station building auxiliary power supply unit 1b to switch to emergency mode without waiting for communication recovery of the notification unit 17, so that the power shortage state of the overhead line 2 can be quickly resolved and the car 4 can perform emergency running.

[0050] In addition, when the power supplied to the overhead line 2 is AC power, generally, if the frequency of the AC power supplied from the feeder line equipment 101 to the overhead line 2 becomes abnormal, equipment such as the substation 100 stops the power supply to the overhead line 2, causing the overhead line 2 to enter a power shortage state. Therefore, in the third embodiment, the frequency of the AC power of the overhead line 2 measured by the voltage sensor 20 may be acquired, and based on the acquired frequency of the AC power of the overhead line 2, it may be determined whether the frequency of the AC power of the overhead line 2 is within a predetermined range, thereby determining whether the overhead line 2 is in a power shortage state. In this case, if the frequency of the AC power of the overhead line 2 is within the predetermined range, it is determined that the overhead line 2 is not in a power shortage state, and if the frequency of the AC power of the overhead line 2 is outside the predetermined range, it is determined that the overhead line 2 is in a power shortage state. By determining whether the overhead line 2 is in a power shortage state based on the presence or absence of an abnormality in the frequency of the AC power of the overhead line 2, the station building auxiliary power supply device 1b of the third embodiment can quickly switch to an emergency mode. In the first and second embodiments, frequency abnormality information indicating that the frequency of the AC power of the overhead line 2 is abnormal may be included as the overhead line abnormality information.

[0051] Finally, a hardware configuration for implementing the functions of the control units 12, 12a, and 12b of the station building auxiliary power supplies 1, 1a, and 1b will be described. FIG. 8 is a diagram illustrating an example configuration of a processing circuit 90 in which the processing circuits included in the control units 12, 12a, and 12b of the station building auxiliary power supplies 1, 1a, and 1b according to the first, second, and third embodiments are implemented using a processor 91 and a memory 92. The processing circuit 90 illustrated in FIG. 8 is a control circuit and includes a processor 91 and a memory 92. When the processing circuit 90 is configured using the processor 91 and the memory 92, each function of the processing circuit 90 is implemented using software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in the memory 92. The processor 91 reads and executes the program stored in the memory 92 to implement each function of the processing circuit 90. That is, the processing circuit 90 includes a memory 92 for storing a program that results in the processing of the station building auxiliary power supply 1. This program can also be said to be a program for causing the control units 12, 12a, 12b of the station building auxiliary power supply units 1, 1a, 1b to execute the functions realized by the processing circuit 90. This program may be provided by a storage medium on which the program is stored, or by other means such as a communication medium.

[0052] Here, the processor 91 is, for example, a CPU (Central Processing Unit), a processing device, an arithmetic unit, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor).The memory 92 is, for example, a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable ROM), or an EEPROM (Electrically EPROM), a magnetic disk, a flexible disk, an optical disk, a compact disk, a minidisk, or a DVD (Digital Versatile Disc).

[0053] FIG. 9 illustrates an example of a dedicated hardware configuration of the processing circuit 93 included in the control unit 12, 12a, or 12b of the station auxiliary power supply devices 1, 1a, or 1b according to the first, second, or third embodiments. The processing circuit 93 illustrated in FIG. 9 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel-programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. The processing circuit 93 may be partially implemented by dedicated hardware and partially implemented by software or firmware. In this manner, the processing circuit 93 can achieve the above-described functions by dedicated hardware, software, firmware, or a combination thereof.

[0054] In the present disclosure, an example has been shown in which the station building auxiliary power supplies 1, 1a, and 1b are provided in the station building 5, but the installation location is not limited to this. The station building auxiliary power supplies 1, 1a, and 1b only need to be electrically connected to the overhead line 2. The station building auxiliary power supplies 1, 1a, and 1b may be installed, for example, outside the station building 5, along the tracks of the overhead line 2, or in facilities around the station.

[0055] Although the present disclosure illustrates an example in which a storage battery is not provided, the station building auxiliary power supply units 1, 1a, and 1b may also include a storage battery. For example, the station building auxiliary power supply units 1, 1a, and 1b may charge a storage battery with regenerative power obtained by the regenerative operation of the vehicle 4 during normal operation, and use the power charged in the storage battery to the load 6 during normal operation and in an emergency. If the station building auxiliary power supply units 1, 1a, and 1b include a storage battery, the station building auxiliary power supply units 1, 1a, and 1b may preferentially supply power from the storage battery to the overhead line 2 when the overhead line 2 is in a power shortage state, and may start supplying power to the overhead line 2 from the commercial grid 103 via the station building auxiliary power supply units 1, 1a, and 1b when the remaining charge of the storage battery decreases. This allows for a stable power supply to the overhead line 2 while effectively utilizing the regenerative power charged in the storage battery.

[0056] In this disclosure, typical numerical examples are shown as voltage values ​​of the overhead line 2, the high-voltage AC distribution line 102, and the commercial grid 103, but the magnitude of the voltage is not limited to these. For example, the voltage value of the overhead line 2 is set within the range of voltages used as overhead line voltages for railways. The voltage value of the commercial grid 103 is set within the range of voltages used in ordinary homes, factories, etc. The voltage value of the high-voltage AC distribution line 102 is set within the range of voltages used when distributing high-voltage power from the substation 100.

[0057] In another embodiment of the present disclosure, although not shown, a changeover switch may be provided at connection point A. For example, the changeover switch is provided so that the secondary side of the station building auxiliary power supply units 1, 1a, 1b is connected to either the transformer 7 or the load 6. The control units 12, 12a, 12b may control the changeover switch in accordance with the mode set by the output mode setting unit 15 to connect the secondary side of the station building auxiliary power supply units 1, 1a, 1b to the load 6 in normal mode, and to connect the secondary side of the station building auxiliary power supply units 1, 1a, 1b to the transformer 7 in emergency mode.

[0058] The configurations shown in the above embodiments are examples of the content, and can be combined with other known technologies, or embodiments of the present disclosure can be combined with each other, and part of the configuration can be omitted or modified within the scope that does not deviate from the gist of the present disclosure.

[0059] REFERENCE SIGNS LIST 1, 1a, 1b Station building auxiliary power supply unit, 2 Overhead line, 3 Current collector, 4 Railway vehicle, 5 Station building, 6 Load, 7, 14 Transformer, 11, 11a Power conversion unit, 12, 12a Control unit, 13 First power conversion unit, 15 Output mode setting unit, 16, 16a Power conversion control unit, 17 Notification unit, 18 Second power conversion unit, 19 Overhead line abnormality determination unit, 20 Voltage sensor, 90, 93 Processing circuit, 91 Processor, 92 Memory, 101 Feeder line equipment, 102 High voltage AC distribution line, 103 Commercial system distribution line.

Claims

1. A station building auxiliary power supply device comprising: a power conversion unit that is electrically connected to an overhead line that supplies power to railway vehicles and to a commercial power distribution line to which a load is connected, and that is capable of bidirectional conversion between a first power that is the power of the overhead line and a second power that is power that can be supplied to the load; an output mode setting unit that sets an output mode that indicates the direction in which the power conversion unit outputs power based on whether the overhead line is in a power shortage state or not; and a power conversion control unit that controls the power conversion unit in accordance with the output mode set by the output mode setting unit, wherein when the overhead line is in a power shortage state, the output mode setting unit sets an emergency mode, which is the output mode in which the power conversion unit converts the second power to the first power and supplies the converted first power to the overhead line.

2. The station building auxiliary power supply device according to claim 1, characterized in that, when the overhead line is not in a power shortage state, the output mode setting unit sets the normal mode, which is the output mode in which the power conversion unit converts the first power to the second power and supplies the converted second power to the load connected to the distribution line of the commercial system.

3. A station building auxiliary power supply device as described in claim 1 or 2, characterized in that overhead line abnormality information indicating a power shortage state of the overhead line is sent to the output mode setting unit, and includes either power outage information of the overhead line, abnormality information of the feeder line equipment that supplies power to the overhead line, or voltage drop information of the overhead line.

4. A station building auxiliary power supply device as described in claim 1 or 2, characterized in that it comprises an overhead line abnormality determination unit that acquires an overhead line voltage measured by a voltage sensor that measures the voltage of the overhead line, and determines that the overhead line is in a state of power shortage if the acquired overhead line voltage is below a predetermined threshold, and the output mode setting unit sets the output mode based on the determination result of the overhead line abnormality determination unit.

5. A station building auxiliary power supply device according to any one of claims 1 to 4, wherein the first power is DC power, and the power conversion unit has an inverter circuit capable of bidirectional conversion.

6. A station building auxiliary power supply device according to any one of claims 1 to 4, wherein the first power is AC power, and the power conversion unit has a converter capable of bidirectional conversion and an inverter capable of bidirectional conversion.

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