Emergency power storage system

Abstract

To safely shut down a circuit even if a large current flows in a distribution line between a storage battery part and a VVVF inverter device.SOLUTION: An emergency power storage system according to an embodiment comprises: a VVVF inverter device which converts DC power into AC power to drive a main motor; a pantograph which is provided on the direct current side of the VVVF inverter device and supplies the power from an overhead power line to the VVVF inverter device; a storage battery part; and a DC circuit part which has one end connected to the storage battery part and the other end connected to a part between the VVVF inverter device and the pantograph, and supplies the DC power to the VVVF inverter device from the storage battery part. The DC circuit part includes a high-speed circuit breaker, and shuts down the circuit with the high-speed circuit breaker when a first prescribed current is generated in a part between the VVVF inverter device and the storage battery part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an emergency power storage system. [Background technology]

[0002] In recent years, many railway operators have become increasingly aware of the need to prepare for emergencies such as power outages on overhead lines, and are increasingly putting battery systems equipped with lithium-ion batteries to power railway vehicles.

[0003] Conventionally, vehicles equipped with variable voltage variable frequency (VVVF) inverter devices (hereinafter simply referred to as VVVF), static inverter devices (SIV: static inverter), and emergency power storage systems are separated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-146696 Summary of the Invention [Problem to be solved by the invention]

[0005] When the VVVF and SIV are installed in separate cars from the emergency energy storage system, the wiring insulation of the crossover wires between the cars can deteriorate due to vibrations, etc., causing ground faults (short circuits), etc. In this case, a system using contactors and switches has the problem of making it difficult to safely interrupt the circuit.

[0006] Furthermore, if the pantograph rises and connects to the overhead lines while connecting the contactor to supply power to the VVVF, there is a problem that the overhead line voltage may flow into the emergency energy storage system, causing the vehicle system to stop.

[0007] This invention was made with the above-mentioned circumstances in mind, and its purpose is to provide a technology that safely cuts off the circuit when a specified current (for example, a current excessive for the VVVF) due to a ground fault (short circuit) or the like occurs between the emergency storage system and the VVVF by placing a high-speed circuit breaker in addition to a contactor in the DC circuit section between the emergency storage system and the VVVF.

[0008] Another object of the present invention is to provide a technology that safely cuts off the circuit even if a predetermined current (e.g., a current excessive for the SIV) due to a ground fault or the like occurs between the SIV (or auxiliary equipment) and the emergency energy storage system by placing a wiring circuit breaker in the AC circuit section between the emergency energy storage system and the SIV (or auxiliary equipment).

[0009] Furthermore, the present invention aims to provide a technology for controlling a control unit disposed in an emergency energy storage system so that the high-speed circuit breaker and DC contactor can be opened or closed when the pantograph is lowered. [Means for solving the problem]

[0010] In one embodiment, the emergency energy storage system comprises a VVVF inverter device that converts DC power into AC power to drive a main motor, a pantograph that is provided on the DC side of the VVVF inverter device and supplies power from an overhead line to the VVVF inverter device, a storage battery unit, and a DC circuit unit that has one end connected to the storage battery unit and the other end connected between the VVVF inverter device and the pantograph and is used to supply DC power from the storage battery unit to the VVVF inverter device, and the DC circuit unit has a high-speed circuit breaker that interrupts the circuit when a first predetermined current is generated between the VVVF inverter device and the storage battery unit. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a main circuit diagram including a circuit diagram of an emergency power storage device according to this embodiment. [Figure 2]FIG. 2 is a control circuit diagram showing an example of a control circuit section of an emergency power storage device. [Figure 3] FIG. 3 is a flowchart showing an example of a processing procedure of the control unit 20 shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] The power storage system will be described in detail below with reference to the drawings. In the following embodiments, parts with the same numbers perform the same operations, and redundant description will be omitted.

[0013] [First embodiment] (composition) FIG. 1 is a main circuit diagram including a circuit diagram of an emergency power storage device 1 according to this embodiment. As shown in Fig. 1, an emergency power storage device 1, which is an emergency power storage system according to this embodiment, includes a storage battery unit 2, an inverter unit 6, a DC circuit unit 101, and an AC circuit unit 102. The emergency power storage device 1 is connected to a VVVF 12 via a VVVF-side high-speed circuit breaker 11. The emergency power storage device 1 is also connected to an SIV 15 and auxiliary machinery 16. The VVVF 12 is further connected to a traction motor 13. The SIV 15 is connected to a pantograph 17 via an SIV-side high-speed circuit breaker 14.

[0014] The DC circuit section 101 includes a first DC contactor 3 , a high-speed circuit breaker 4 , and a second DC contactor 5 .

[0015] The AC circuit unit 102 includes an AC reactor 7, an AC capacitor 8, a three-phase AC contactor 9, and a molded case circuit breaker 10.

[0016] When the pantograph 17 is not connected to the down overhead line, for example, in an emergency when the power supply from the overhead line is cut off due to a power outage or the like, the storage battery unit 2 supplies power to the VVVF 12 via the DC circuit unit 101 or supplies power to the auxiliary equipment 16 via the AC circuit unit 102. When the pantograph 17 is connected to the up overhead line, the storage battery unit 2 can be charged by receiving power from the SIV 15 via the AC circuit unit 102.

[0017] The high-speed circuit breaker 4, the first DC contactor 3, and the second DC contactor 5 are installed in the circuit between the storage battery unit 2 and the VVVF 12. For example, the high-speed circuit breaker 4 and the first DC contactor 3 are installed on the positive wiring, and the second DC contactor 5 is installed on the negative wiring. When the pantograph 17 is not connected to the overhead line and power is to be supplied from the storage battery unit 2 to the VVVF 12, the high-speed circuit breaker 4, the first DC contactor 3, and the second DC contactor 5 are closed, electrically connecting the storage battery unit 2 and the VVVF 12 and enabling power from the storage battery unit 2 to be sent to the VVVF 12. If a ground fault occurs in the wiring between the emergency power storage device 1 and the VVVF 12 and a large current flows, the high-speed circuit breaker 4 can break the circuit using a self-tripping function. The high-speed circuit breaker 4 can also break the circuit in response to an instruction from a control unit or the like.

[0018] Furthermore, the first DC contactor 3 and the second DC contactor 5 break the circuit in response to an instruction from the control unit, etc., after the high-speed circuit breaker 4 has performed a breaking operation. This makes it possible to reliably break the circuit between the storage battery unit 2 and the VVVF 12 using multiple devices, and even if the high-speed circuit breaker 4 cannot be opened due to sticking or welding, for example, when it detects an overcurrent and performs a breaking operation, it is possible to break the circuit by opening the first DC contactor 3 and the second DC contactor 5.

[0019] The AC reactor 7 and AC capacitor 8 arranged in the AC circuit unit 102 are installed between the storage battery unit 2 and the auxiliary machine 16 or SIV 15 via the inverter unit 6. The inverter unit 6 converts the DC current output from the storage battery unit 2 into a three-phase AC current. The AC reactor 7 and AC capacitor 8 smooth the input current and voltage, respectively.

[0020] When a predetermined current (e.g., a current excessive for the auxiliary equipment 16 or SIV15) flows in the wiring between the auxiliary equipment 16 or SIV15 and the inverter unit 6, the three-phase AC contactor 9 cuts off the circuit so that the predetermined current is not supplied to the wiring.

[0021] The molded case circuit breaker 10 is installed between the auxiliary equipment 16 or the SIV 15 and the storage battery unit 2, and is installed on the wiring output from the inverter unit 6. When the storage battery unit 2 is charged using power from the SIV 15, a ground fault may occur in the wiring between the SIV 15 and the inverter unit 6. When a predetermined current (e.g., a current excessive for the SIV 15) caused by this ground fault occurs between the SIV 15 and the inverter unit 6, the molded case circuit breaker 10 breaks the circuit using its self-tripping function to prevent the predetermined current from flowing to the inverter unit 6. Also, when power is supplied from the storage battery unit 2 to the auxiliary equipment 16 via the inverter unit 6, a ground fault may occur in the wiring between the inverter unit 6 and the auxiliary equipment 16. The molded case circuit breaker 10 breaks the circuit using its self-tripping function to prevent the predetermined current (e.g., a current excessive for the auxiliary equipment 16) caused by this ground fault from flowing to the auxiliary equipment 16.

[0022] The VVVF-side high-speed circuit breaker 11 is installed on the DC side of the VVVF 12, which will be described later. The VVVF-side high-speed circuit breaker 11 breaks the circuit when a predetermined current (for example, a current excessive for the VVVF 12) flows in the wiring between the VVVF 12 and the pantograph 17.

[0023] The VVVF 12 is a power conversion device that converts DC power supplied from the pantograph 17 or the storage battery unit 2 into AC power. The VVVF 12 is also capable of changing the voltage and current supplied to the main motor 13, which will be described later.

[0024] The main motor 13 drives the vehicle based on the electric power supplied from the VVVF 12.

[0025] The SIV-side high-speed circuit breaker 14 is installed between the SIV 15 and the pantograph 17. The SIV-side high-speed circuit breaker 14 breaks the circuit when a predetermined current (for example, a current excessive for the SIV 15) is supplied from the pantograph 17 to the SIV 15.

[0026] SIV 15 is installed between auxiliary equipment 16 and pantograph 17. SIV 15 converts DC power supplied from pantograph 17 into AC power, and also steps down the voltage (for example, 1500V to 1800V) supplied from pantograph 17 to convert it into a voltage at which auxiliary equipment 16 can operate.

[0027] The auxiliary equipment 16 includes lighting equipment, air conditioning equipment, and the like.

[0028] The pantograph 17 takes in power from the overhead line. If an abnormality occurs, the pantograph 17 is lowered to disconnect from the overhead line, and power is supplied from the storage battery unit 2 to the VVVF 12 and the auxiliary machinery 16.

[0029] (operation) Next, the operation of the emergency power storage device 1 configured as above will be described. First, the operation of the DC circuit section 101 will be described.

[0030] First, assume that the pantograph 17 is down and power is being supplied from the storage battery unit 2 to the VVVF 12, i.e., an emergency situation exists. In this case, if a ground fault or the like occurs in the wiring between the storage battery unit 2 and the VVVF 12, causing a predetermined current (e.g., a current excessive for the VVVF 12) to flow between the storage battery unit 2 and the VVVF 12, the high-speed circuit breaker 4 will shut off the circuit using its self-tripping function. This shuts off the circuit in the DC circuit unit 101, and the VVVF 12 will no longer be affected by the excessive current. Therefore, the VVVF 12 will not be destroyed by the excessive current.

[0031] Furthermore, if the pantograph 17 accidentally connects to the overhead line while the storage battery unit 2 is supplying power to the VVVF 12, the voltage supplied by the storage battery unit 2 will be lower than the voltage supplied by the pantograph 17, causing an excessive current to flow from the pantograph 17 to the storage battery unit 2. In such a case, the high-speed circuit breaker 4 breaks the circuit using its self-tripping function. This breaks the circuit in the DC circuit unit 101, preventing the storage battery unit 2 from being destroyed by the excessive current from the pantograph 17.

[0032] Next, the operation of the AC circuit section 102 will be described.

[0033] Assume that the storage battery unit 2 is charged from the SIV 15 through the inverter unit 6. In this case, if a ground fault or the like occurs between the SIV 15 and the inverter unit 6, a predetermined current (e.g., a current excessive for the storage battery unit 2) may flow from the SIV 15 to the inverter unit 6. In such a case, the molded case circuit breaker 10 cuts off the circuit using its self-tripping function. This cuts off the circuit in the AC circuit unit 102. Therefore, even if an excessive current occurs due to a ground fault or the like while the storage battery unit 2 is being charged, the molded case circuit breaker 10 cuts off the circuit. Therefore, the storage battery unit 2, the inverter unit 6, and the SIV 15 will not be destroyed by the excessive current.

[0034] Furthermore, if the SIV 15 fails or if the pantograph 17 is not connected to the down overhead line, the storage battery unit 2 supplies power to the auxiliary equipment 16 via the inverter unit 6. In such a case, if a ground fault or the like occurs in the wiring between the auxiliary equipment 16 and the inverter unit 6, a predetermined current (e.g., a current excessive for the auxiliary equipment 16) may flow from the inverter unit 6 to the auxiliary equipment 16. In such a case, the molded case circuit breaker 10 breaks the circuit using its self-tripping function. This breaks the circuit in the AC circuit unit 102, preventing the storage battery unit 2, the inverter unit 6, and the auxiliary equipment 16 from being destroyed by the excessive current.

[0035] (Operation and effect of the first embodiment) According to the first embodiment described above, even if a ground fault or the like occurs in the wiring from the emergency storage device 1 to the VVVF 12 and excessive current flows, the circuit can be safely interrupted by the high-speed circuit breaker 4.

[0036] Furthermore, when power is supplied from the storage battery unit 2 to the auxiliary equipment 16 via the inverter unit 6, or when the storage battery unit 2 is charged from the SIV 15 via the inverter unit 6, even if an excessive current flows in the wiring between these units due to a ground fault or the like, the circuit can be safely interrupted by the molded case circuit breaker 10.

[0037] [Second embodiment] (composition) The circuit diagram of the emergency power storage device 1 in the second embodiment is the same as that shown in FIG. 1 of the first embodiment, and therefore the explanation of the emergency power storage device 1 will be omitted.

[0038] FIG. 2 is a control circuit diagram showing an example of the control circuit section 100 of the emergency power storage device 1. As shown in FIG. The control circuit unit 100 includes a control unit 20, a high-speed circuit breaker closing relay contact 21, a high-speed circuit breaker control coil 22, a first DC contactor closing relay contact 23, a first DC contactor control coil 24, a second DC contactor closing relay contact 25, and a second DC contactor control coil 26. Fig. 2 also shows a control battery group 18 and a pantograph rising detection relay contact 19, which are installed outside the control circuit unit 100.

[0039] The control battery group 18 is a battery group for supplying power (for example, 100V) to the control circuit unit 100 when the pantograph 17 is not connected to the overhead line.

[0040] The pantograph-up ​​detection relay contact 19 is not closed when the pantograph 17 is connected to the overhead line. Therefore, power is not supplied to the control circuit unit 100 from the control battery group 18. On the other hand, when the pantograph 17 is lowered and not connected to the overhead line, the pantograph-up ​​detection relay contact 19 is closed. Then, power is supplied to the control circuit unit 100 from the control battery group 18.

[0041] The control unit 20 controls whether to open or close the high-speed circuit breaker closing relay contact 21, the first DC contactor closing relay contact 23, and the second DC contactor closing relay contact 25. For example, when power is supplied from the control battery group 18, that is, when the pantograph 17 is not connected to the overhead line, the storage battery unit 2 supplies power to the VVVF 12. In this case, the control unit 20 closes the high-speed circuit breaker closing relay contact 21, the first DC contactor closing relay contact 23, and the second DC contactor closing relay contact 25 to supply power from the storage battery unit 2 to the VVVF 12. At this time, if a ground fault occurs and a predetermined current (for example, a current excessive for VVVF 12) flows between the storage battery unit 2 and VVVF 12, the control unit 20 closes each contact to open the high-speed circuit breaker closing relay contact 21, the first DC contactor closing relay contact 23, and the second DC contactor closing relay contact 25, thereby interrupting the circuit. In other words, the control unit 20 controls so that excessive current does not flow to the storage battery unit 2 and VVVF 12.

[0042] The control unit 20 also includes a CPU, memory, an interface, etc. The CPU is a processor that executes programs to realize various processing functions. The memory includes various types of memory, such as a nonvolatile memory that stores the programs executed by the CPU, a volatile memory that temporarily holds data, and a rewritable nonvolatile memory that saves setting data, etc. That is, the control unit 20 performs various processes by having the CPU execute the programs stored in the memory.

[0043] The high-speed circuit breaker closing relay contact 21, the first DC contactor closing relay contact 23, and the second DC contactor closing relay contact 25 are controlled by the control unit 20 to be opened or closed. For example, when the high-speed circuit breaker closing relay contact 21 is closed, the high-speed circuit breaker 4 connects the circuit via the high-speed circuit breaker control coil 22, and when the high-speed circuit breaker closing relay contact 21 is opened, the high-speed circuit breaker 4 breaks the circuit. Furthermore, when the first DC contactor making relay contact 23 and the second DC contactor making relay contact 25 are respectively closed, the first DC contactor control coil 24 and the second DC contactor control coil 26 connect the first DC contactor 3 and the second DC contactor 5 to the circuit, and when the first DC contactor making relay contact 23 and the second DC contactor making relay contact 25 are respectively opened, the first DC contactor control coil 24 and the second DC contactor control coil 26 cause the first DC contactor 3 and the second DC contactor 5 to break the circuit.

[0044] (operation) Next, the operation of the emergency power storage device 1 configured as above will be described. FIG. 3 is a flowchart showing an example of a processing procedure of the control unit 20 shown in FIG.

[0045] The operation of this flowchart is realized by reading out a program stored in the control unit 20 and a memory disposed within the control unit 20.

[0046] This flowchart begins when the pantograph 17 is lowered and disconnected from the overhead line.

[0047] The control unit 20 detects that the pantograph rise detection relay contact 19 has been closed (step ST101). The pantograph 17 is lowered and disconnected from the overhead line, causing the pantograph rise detection relay contact 19 to be closed. The control unit 20 receives power from the control battery group 18 as a result of the pantograph rise detection relay contact 19 being closed. This causes the control unit 20 to detect that the pantograph rise detection relay contact 19 has been closed.

[0048] When pantograph rise detection relay contact 19 is closed, control unit 20 closes high-speed circuit breaker closing relay contact 21, first DC contactor closing relay contact 23, and second DC contactor closing relay contact 25, respectively, and connects the circuit from VVVF 12 to emergency power storage device 1 via high-speed circuit breaker 4, first DC contactor 3, and second DC contactor 5. Furthermore, when pantograph 17 rises and pantograph rise detection relay contact 19 is opened, high-speed circuit breaker closing relay contact 21, first DC contactor closing relay contact 23, and second DC contactor closing relay contact 25 are each forcibly opened, and the circuit from VVVF 12 to emergency power storage device 1 is interrupted by high-speed circuit breaker 4, first DC contactor 3, and second DC contactor 5 (step ST102).

[0049] The control unit 20 determines whether a predetermined condition for interrupting the circuit of the DC circuit unit 101 is met (step ST103). Here, the predetermined condition may be a condition that a predetermined current (e.g., a current excessive for the VVV 12) is flowing in the wiring between the VVVF 12 and the emergency power storage device 1 due to a ground fault or the like. Alternatively, the predetermined condition may be an instruction from an administrator to interrupt the circuit of the DC circuit unit 101. In other words, the predetermined condition may be any condition that interrupts the circuit of the DC circuit unit 101.

[0050] If it is determined that the predetermined condition is not satisfied, the process may return to step ST102. On the other hand, if it is determined that the predetermined condition is satisfied, the process proceeds to step ST104.

[0051] The control unit 20 opens the high-speed circuit breaker closing relay contact 21 (step ST104). When the control unit 20 opens the high-speed circuit breaker closing relay contact 21 and the second DC contactor closing relay contact 25, the high-speed circuit breaker 4 breaks the circuit.

[0052] The control unit 20 opens the first DC contactor making relay contact 23 and the second DC contactor making relay contact 25 (step ST105). When the control unit 20 opens the first DC contactor making relay contact 23 and the second DC contactor making relay contact 25, the first DC contactor 3 and the second DC contactor 5 break the circuit. For example, even if the high-speed circuit breaker 4 cannot break the circuit due to sticking, welding, or the like, the first DC contactor 3 and the second DC contactor 5 can break the circuit. This makes it possible to break the circuit more reliably and safely.

[0053] (Effects of the second embodiment) According to the second embodiment described above, the control unit 20 can detect that the pantograph 17 is lowered by closing the pantograph-up ​​detection relay contact 19. Therefore, it is possible to provide an interlock that allows the control unit 20 to close or open the circuits of the high-speed circuit breaker 4, the first DC contactor 3, and the second DC contactor 5 only when the pantograph 17 is lowered. In other words, when the pantograph 17 is raised and the pantograph-up ​​detection relay contact 19 is open, the circuits of the high-speed circuit breaker 4, the first DC contactor 3, and the second DC contactor 5 are opened, and the pantograph 17, which is connected to the overhead line via the DC circuit unit 101, and the storage battery unit 2 are not electrically connected.

[0054] Furthermore, even if a ground fault or the like occurs in the wiring from the emergency power storage device 1 to the VVVF 12 and an excessive current flows, the control unit 20 can safely interrupt the circuit using the high-speed circuit breaker 4, the first DC contactor 3, and the second DC contactor 5. Furthermore, by controlling the interruption of the circuit using the control unit 20, it becomes possible to interrupt the circuit using the high-speed circuit breaker 4, the first DC contactor 3, and the second DC contactor 5 under any conditions.

[0055] [Other embodiments] The present invention is not limited to the above-described embodiments. For example, the first and second embodiments may be combined. That is, when an excessive current is generated in the wiring between the VVVF 12 and the emergency power storage device 1 while the pantograph 17 is down, the high-speed circuit breaker 4 may break the circuit by its self-tripping function, and the control unit 20 may control the high-speed circuit breaker 4, the first DC contactor 3, and the second DC contactor 5 to break the circuit.

[0056] Furthermore, the control unit 20 may control the molded case circuit breaker 10 and the three-phase AC contactor 9 to break the circuit.

[0057] In short, this invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in combination as appropriate as possible, and in such cases, the combined effects can be obtained. Furthermore, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining the disclosed multiple constituent elements. [Explanation of symbols]

[0058] 1...Emergency power storage device 2...Battery section 3...First DC contactor 4...High-speed circuit breaker 5...Second DC contactor 6...Inverter section 7...AC reactor 8...AC capacitor 9…Three-phase AC contactor 10...Circuit breaker 11...VVVF side high-speed circuit breaker 12...VVVF 13…Main motor 14...SIV side high-speed circuit breaker 16...Auxiliary 17...Pantograph 18...Control battery group 19...Pantograph rising detection relay contact 20...Control unit 21...High-speed circuit breaker closing relay contact 22...High-speed circuit breaker control coil 23...First DC contactor closing relay contact 24...First DC contactor control coil 25...Second DC contactor closing relay contact 26...Second DC contactor control coil 100...Control circuit section 101...DC circuit section 102...AC circuit section

Claims

1. a VVVF inverter device that converts DC power into AC power to drive a main motor; a pantograph provided on a DC side of the VVVF inverter device and supplying power from an overhead line to the VVVF inverter device; A storage battery unit; a DC circuit section having one end connected to the storage battery section and the other end connected between the VVVF inverter device and the pantograph, for supplying DC power from the storage battery section to the VVVF inverter device; an inverter unit that converts DC power from the storage battery unit into AC power; an AC circuit unit connected to a static inverter device for converting DC power into AC power and charging the storage battery unit; and an auxiliary device; the DC circuit unit has a high-speed circuit breaker, and when a first predetermined current is generated between the VVVF inverter device and the storage battery unit, the high-speed circuit breaker breaks the circuit; The AC circuit unit includes a molded case circuit breaker connected to the inverter unit. Emergency power storage system.

2. the molded case circuit breaker breaks the circuit when a second predetermined current is generated in the wiring between the static inverter device and the inverter unit while the storage battery unit is being charged with power from the static inverter device; The emergency power storage system according to claim 1 .

3. 3. The emergency power storage system according to claim 2, wherein the circuit breaker breaks the circuit when a third predetermined current is generated in the wiring between the inverter unit and the auxiliary equipment while power is being supplied from the storage battery unit to the auxiliary equipment via the inverter unit.

4. the DC circuit unit further includes a first DC contactor connected in series to the high-speed circuit breaker, and a second DC contactor installed on a wiring different from the wiring on which the high-speed circuit breaker is arranged, The emergency power storage system further includes a control unit that controls interruption of the circuits of the high-speed circuit breaker, the first DC contactor, and the second DC contactor, The emergency energy storage system according to any one of claims 1 to 3, wherein the control unit controls the high-speed circuit breaker, the first DC contactor, and the second DC contactor to interrupt the circuit when a pantograph connected to the emergency energy storage system is not connected to an overhead line.

5. 5. The emergency power storage system according to claim 4, wherein the control unit detects that the pantograph is not connected to the overhead line by detecting that a pantograph rise detection relay contact connected to the control unit is closed.

6. A VVVF inverter device that converts DC power into AC power to drive a main motor; a pantograph provided on a DC side of the VVVF inverter device and supplying power from an overhead line to the VVVF inverter device; A storage battery unit; a DC circuit unit having one end connected to the storage battery unit and the other end connected between the VVVF inverter device and the pantograph, supplying DC power from the storage battery unit to the VVVF inverter device, and including a high-speed circuit breaker, a first DC contactor connected in series to the high-speed circuit breaker, and a second DC contactor installed on a wiring separate from the wiring on which the high-speed circuit breaker is arranged; a control unit that controls the interruption of the circuits of the high-speed circuit breaker, the first DC contactor, and the second DC contactor; wherein the DC circuit unit interrupts the circuit by the high-speed circuit breaker when a first predetermined current is generated between the VVVF inverter device and the storage battery unit. Emergency power storage system.

7. An emergency energy storage system as described in Claim 6, wherein the control unit controls the high-speed circuit breaker, the first DC contactor, and the second DC contactor to interrupt the circuit when the pantograph connected to the emergency energy storage system is not connected to the overhead line.

8. An emergency energy storage system as described in Claim 6, wherein the control unit detects that the pantograph is not connected to the overhead line by detecting that a pantograph rise detection relay contact connected to the control unit has been closed.

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