JP2023044769A - Direct current power supply system - Google Patents

Abstract

To provide a direct current power supply system which allows an electric train to travel without any power failure in feeder sections divided by sections.SOLUTION: A direct current power supply system includes: a first trolley wire which is connected to a first direct current power source; a second trolley wire which is connected with the first trolley wire via an air section; a first diode which has an anode connected to the first trolley wire and a cathode connected to the second trolley wire; a third trolley wire which is connected to a second direct current power source; a fourth trolley wire which is connected via the respective air sections between the second trolley wire and the third trolley wire; and a second diode which has an anode connected to the third trolley wire and a cathode connected to the fourth trolley wire.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a DC power supply system that supplies DC power to a train.

2. Description of the Related Art In electric railways, it may be necessary to separate feeder circuits between different power sources due to the different circuits of the operating railway operator and the electric power company receiving power. In such a case, a method of using partitioning sections between separate feeding circuits can be considered (for example, Non-Patent Document 1).

According to Non-Patent Document 1, although it is an AC feeding circuit, it is described that different power supplies are separated by a different phase section or an AC/DC section with a section for separation. This dividing section can also be applied when connecting between DC feeding circuits.

On the other hand, a dead section is provided in the section for division, and the train runs in the unpressurized part where there is no power supply to the overhead line with the notch off.

A train is equipped with a large-capacity filter capacitor included in a power conversion device for driving. When the train runs through the non-pressurized section, the voltage of the filter capacitor drops because the power supply from the overhead wire is cut off. After that, when the train enters the next feeding section, the overhead line voltage is applied to the train whose filter capacitor voltage is low. In this case, an inrush current flows to charge the filter capacitor. When such an inrush current flows, the substation that supplies power to the overhead line may determine that it is an accident current from the current gradient, and may open the feeder circuit breaker to take protective action. be.

Therefore, before entering the non-pressurized section of the section, the train notches off, opens the contactor of the main circuit, and connects the initial charging resistor in series with the filter capacitor in preparation for re-pressurization of the overhead wire. It is necessary to connect and perform circuit switching operations such as suppressing inrush current. The greater the number of sections, the more times these contactors are operated, and the more times the contactors are operated, the more equipment maintenance is required.

Also, if the train stops in the non-pressurized section, the electric power for running will not be supplied and it will not be able to run on its own.

In general, the DC feeding circuits are connected in parallel, and the regenerative electric power of the train is widely used throughout the line. However, in the DC feeding circuit divided by the section for division, the interchange of regenerative power between trains is extremely poor, and the trains cannot fully utilize the regenerative power.

Latest Electric Railway Engineering, The Institute of Electrical Engineers of Japan Special Committee on Education and Research in Electric Railways, Corona Publishing, P.132-134

The problem to be solved by the present invention is to provide a direct-current power supply system that allows trains to run uninterruptedly in feeder sections divided into sections.

A DC power supply system according to an embodiment includes a first contact line connected to a first DC power supply, a second contact line connected to the first contact line via an air section, and an anode of the first contact line. and a cathode connected to the second contact line, a third contact line connected to the second DC power supply, and between the second contact line and the third contact line, respectively A fourth contact line connected via an air section, and a second diode having an anode connected to the third contact line and a cathode connected to the fourth contact line.

FIG. 1 is a circuit block diagram of a DC power feeding system according to the first embodiment. FIG. 2 is a circuit block diagram of a DC power feeding system according to the second embodiment. FIG. 3 is a circuit block diagram of a DC power feeding system according to the third embodiment. FIG. 4 is a circuit block diagram of a DC power supply system according to the fourth embodiment. FIG. 5 is a circuit block diagram of a DC power feeding system according to the fifth embodiment. FIG. 6 is a circuit block diagram of a DC power feeding system according to the sixth embodiment.

Hereinafter, embodiments will be described with reference to the drawings. Several embodiments shown below are examples of apparatuses and methods for embodying the technical idea of the present invention. not to be In the following description, elements having the same functions and configurations are denoted by the same reference numerals, and overlapping descriptions are omitted.

[1] First Embodiment [1-1] Configuration of DC power supply system 1 The DC power supply system 1 according to this embodiment is for trains in transportation such as railways and monorails, from a substation through a DC feeding circuit. It is a system that uses a DC feeding method to supply DC power.

FIG. 1 is a circuit block diagram of a DC power supply system 1 according to the first embodiment.

The DC power supply system 1 includes a substation 10-1, a substation 10-2, four contact lines 20-1 to 20-4, three air sections 21-1 to 21-3, a return line 22, and a power supply device. 30-1 and a power supply device 30-2.

A train 100 is a vehicle in transportation such as a railway or a monorail. The train 100 is supplied with DC power from the train line via a current collector (for example, a pantograph), and runs on rails, for example, using this DC power as a power source.

The substations 10-1 and 10-2 are facilities for supplying DC power to overhead contact lines. The substation 10-1 has a DC power supply 11-1. The substation 10-2 has a DC power supply 11-2. The DC power supply 11-1 and the DC power supply 11-2 each generate DC power. The DC power supply 11-1, for example, receives AC voltage and generates DC power using a power converter such as a rectifier. The DC power supply 11-1 may be a power storage device that stably outputs DC power from a storage battery using a power converter. The DC power supply 11-2 has the same configuration as the DC power supply 11-1.

Each of the four train lines 20-1 to 20-4 is installed so as to be able to come into contact with a current collector of the train 100, and is a device that supplies electric power to the train 100. FIG. In this specification, when there is no particular need to distinguish between the contact lines 20-1 to 20-4, the branch numbers are omitted. The same applies to other branched reference numerals. The contact line 20 includes an overhead wire and a third rail. An overhead wire is an electric wire that is installed above a track. Catenary lines are also called feeder lines. A third rail is another rail provided outside the rail, and electric power is supplied to the electric train 100 using the third rail.

One end of the train line 20-1 is electrically connected to the positive electrode of the DC power supply 11-1. The other end of the contact line 20-1 is connected to one end of the contact line 20-2 via the air section 21-1. One end of the train line 20-3 is electrically connected to the positive electrode of the DC power supply 11-2. The other end of the contact line 20-3 is connected to one end of the contact line 20-4 via the air section 21-2. The other end of the contact line 20-4 is connected to the other end of the contact line 20-2 via the air section 21-3. That is, the contact line 20-2 and the contact line 20-4 are not directly connected to the DC power supply. A section of contact line not directly connected to a DC power supply, that is, a section of contact line sandwiched between air sections is also called a middle section. In this embodiment, the sections of the contact line 20-2 and the contact line 20-4 are medium sections.

Each of the air sections 21-1 to 21-3 is a switching section that insulates different electric systems and electrically divides the contact lines. The air section 21 is configured by arranging two contact lines with different power supply sources in parallel, and insulating the parallel portions of the two contact lines with air. The distance between the air section 21-1 and the substation 10-1 is sufficiently long. The distance between the air section 21-3 and the substation 10-2 is sufficiently long.

A return line 22 is a conductor through which a return current flows. One end of the return line 22 is connected to the negative pole of the DC power supply 11-1, and the other end is connected to the negative pole of the DC power supply 11-2. A return line 22 returns the return current to the DC power supply 11-1 and the DC power supply 11-2. The return line 22 corresponds to a rail in a railway where rails are present, and corresponds to a dedicated negative wire for passing a return current in a traffic system running on rubber tires or the like.

The power supply device 30-1 has a function of supplying electric power to the overhead contact line 20-2. The power supply device 30-1 has a diode 31-1. The diode 31-1 has an anode electrically connected to the train line 20-1 and a cathode electrically connected to the train line 20-2. The diode 31-1 has a function of supplying current from the DC power supply 11-1 to the train line 20-2.

The power supply device 30-2 has a function of supplying electric power to the overhead contact line 20-4. The power supply device 30-2 has a diode 31-2. The diode 31-2 has an anode electrically connected to the train line 20-3 and a cathode electrically connected to the train line 20-4. Diode 31-2 operates to supply current from DC power supply 11-2 to contact line 20-4.

[1-2] Operation Next, the operation of the DC power feeding system 1 will be described. Here, a case where the train 100 runs from the DC power supply 11-1 toward the DC power supply 11-2 will be described as an example.

The train line 20-1 receives DC power supply from a DC power supply 11-1. The electric train 100 is supplied with DC power from the electric train line 20-1 and can run in the section of the electric train line 20-1. A section of each contact line 20 is also called a feeding section. After that, the train 100 passes through the air section 21-1 and enters the section of the train line 20-2.

The diode 31-1 allows current to flow from the train line 20-1 to the train line 20-2. That is, the contact line 20-2 receives DC power from the contact line 20-1 through the diode 31-1. The electric train 100 is supplied with DC power from the electric train line 20-2 and can run in the section of the electric train line 20-2. After that, the train 100 passes through the air section 21-3 and enters the section of the train line 20-4.

Diode 31-2 allows current to flow from contact line 20-3 to contact line 20-4. That is, the contact line 20-4 receives DC power from the contact line 20-3 through the diode 31-2. The electric train 100 is supplied with DC power from the electric train line 20-4 and can run in the section of the electric train line 20-4. After that, the train 100 passes through the air section 21-2 and enters the section of the train line 20-3.

The train line 20-3 receives DC power from the DC power supply 11-2. The electric train 100 is supplied with DC power from the electric train line 20-3 and can run in the section of the electric train line 20-3.

Thus, the overhead contact line 20-2, which is not directly connected to the DC power supply, is fed by the diode 31-1. Also, the overhead contact line 20-4 to which the DC power supply is not directly connected is fed by the diode 31-2. As a result, uninterrupted power supply can be achieved in all sections of the overhead contact lines.

[1-3] Effect of the First Embodiment According to the first embodiment, it is possible to make all feeding sections divided by air sections uninterruptible. Specifically, using two DC power supplies 11-1 and 11-2 and two diodes 31-1 and 31-2, four feeding sections divided by three air sections are All can be made uninterruptible. As a result, the train 100 can run on the train lines 20-1 to 20-4 without interruption.

Further, since the train 100 can always supply DC power while it is running between the DC power supply 11-1 and the DC power supply 11-2, the operation of initially charging the filter capacitor mounted on the train 100 can be suppressed. As a result, the number of operations of the contactors mounted on the train 100 can be reduced, so maintenance of the train 100 can be reduced.

Further, unlike the conventional dead section system, power failure sections can be eliminated, so even if the train 100 stops in the middle section, electric power for running can be supplied to the train 100 . This allows the train 100 to run again.

[2] Second Embodiment In the second embodiment, the return line 22 is electrically separated between the feeding section of the substation 10-1 and the feeding section of the substation 10-2.

FIG. 2 is a circuit block diagram of the DC power feeding system 1 according to the second embodiment. The DC power supply system 1 further comprises a return line 22-1, a return line 22-2 and a switching section 23.

One end of the return wire 22-1 is connected to the negative electrode of the DC power supply 11-1. The other end of the return line 22-1 is connected via the switching section 23 to one end of the return line 22-2. The other end of the return wire 22-2 is connected to the negative electrode of the DC power supply 11-2. The switching section 23 is a device that isolates the return line 22-1 and the return line 22-2. Other configurations are the same as those of the first embodiment.

According to the second embodiment, the feeding section of the substation 10-1 and the feeding section of the substation 10-2 are insulated. As a result, it is possible to prevent an electrical system failure occurring in one of the feeder sections of the substation 10-1 and the feeder section of the substation 10-2 from affecting the other.

[3] Third Embodiment In the third embodiment, a current detector for monitoring the current flowing through the diode 31 is provided.

FIG. 3 is a circuit block diagram of the DC power feeding system 1 according to the third embodiment.

The power supply device 30-1 further includes a current detector 32-1 and a control circuit 33-1. Current detector 32-1 is electrically connected between the anode of diode 31-1 and train line 20-1. The current detector 32-1 detects the current flowing through the diode 31-1 and the reverse current of the diode 31-1.

The control circuit 33-1 determines whether the diode 31-1 has failed based on the detection result of the current detector 32-1.

The power supply device 30-2 further includes a current detector 32-2 and a control circuit 33-2. Current detector 32-2 is electrically connected between the anode of diode 31-2 and train line 20-3. The current detector 32-2 detects the current flowing through the diode 31-2 and the reverse current of the diode 31-2.

The control circuit 33-2 determines whether the diode 31-2 has failed based on the detection result of the current detector 32-2.

Other configurations are the same as those of the second embodiment.

In the DC power supply system 1 configured as described above, the control circuit 33-1 uses a communication device including wired or wireless to monitor the DC power supply system 1 ( (not shown), information indicating that the diode 31-1 has failed. Similarly, when the diode 31-2 fails, the control circuit 33-2 notifies the monitoring device that monitors the DC power supply system 1 of the failure of the diode 31-2 using a communication device including wired or wireless communication. Send the information shown. Also, the control circuit 33-1 and the control circuit 33-2 use the communication device to transmit information indicating that the diodes 31-1 and 31-2 have failed to the substations 10-1 and 10-2. can be

According to the third embodiment, it is possible to detect that the diode 31 has failed, so that the diode 31 can be repaired quickly. In addition, it is possible to prevent the failure of the diode 31 from affecting the train 100 .

It should be noted that it is also possible to apply the first embodiment to the third embodiment.

[4] Fourth Embodiment In the fourth embodiment, a contactor is used to electrically disconnect the diode 31 from the DC power supply 11 when the diode 31 fails.

FIG. 4 is a circuit block diagram of the DC power feeding system 1 according to the fourth embodiment.

The power feeding device 30-1 further includes a contactor 34-1. One end of the contactor 34-1 is electrically connected to the train line 20-1, and the other end is electrically connected to the anode of the diode 31-1.

The power feeding device 30-2 further includes a contactor 34-2. One end of the contactor 34-2 is electrically connected to the train line 20-3, and the other end is electrically connected to the anode of the diode 31-2.

The control circuit 33-1 closes (turns on) the contactor 34-1 if the diode 31-1 has not failed. The control circuit 33-1 opens (turns off) the contactor 34-1 when the diode 31-1 fails. Thereby, when the diode 31-1 fails, the diode 31-1 can be electrically disconnected from the DC power supply 11-1.

Further, during maintenance of the power supply device 30-1, the control circuit 33-1 opens the contactor 34-1 according to an instruction from the outside. This allows maintenance and repair of the diode 31-1 and the current detector 32-1.

Control circuit 33-2 closes contactor 34-2 if diode 31-2 is not faulty. Control circuit 33-2 opens contactor 34-2 when diode 31-2 fails. Thereby, when the diode 31-2 fails, the diode 31-2 can be electrically disconnected from the DC power supply 11-2.

Further, during maintenance of the power supply device 30-2, the control circuit 33-2 opens the contactor 34-2 according to an instruction from the outside. This allows maintenance and repair of the diode 31-2 and the current detector 32-2.

According to the fourth embodiment, the diode 31 can be electrically disconnected from the DC power supply 11 automatically and quickly when the diode 31 fails. In addition, maintenance of the power supply device 30 can be safely performed.

As a modification, the power supply devices 30-1 and 30-2 may be configured without the current detectors 32-1 and 32-2. In this modification, the control circuit 33 opens the contactor 34 according to an instruction from the outside.

[5] Fifth Embodiment The fifth embodiment is an embodiment in which the lines of the first to fourth embodiments are double-tracked.

[5-1] Configuration of DC Power Supply System 1 FIG. 5 is a circuit block diagram of the DC power supply system 1 according to the fifth embodiment. A DC power supply system 1 includes a double line consisting of a first line 2-1 and a second line 2-2. Each of the first line 2-1 and the second line 2-2 corresponds to any line of the first to fourth embodiments. As described above, the distance between substation 10-1 and air section 21-1 is sufficiently long, and the distance between substation 10-2 and air section 21-3 is sufficiently long. FIG. 5 shows the impedance 50 of the contact line and the return line.

The DC power supply system 1 further includes a control device 40, a contactor 24-1, and a contactor 24-2.

One end of the contactor 24-1 is electrically connected to the contact line 20-1 of the track 2-1, and the other end is electrically connected to the contact line 20-1 of the track 2-2. One end of the contactor 24-2 is electrically connected to the contact line 20-3 of the track 2-1, and the other end is electrically connected to the contact line 20-3 of the track 2-2.

A return line 22-1 of the line 2-1 is electrically connected to a return line 22-1 of the line 2-2 by a wiring 25-1. A return line 22-2 of the line 2-1 is electrically connected to a return line 22-2 of the line 2-2 by a wiring 25-2.

The substation 10-1 further includes a contactor 12-1 and a contactor 13-1. One end of the contactor 12-1 is electrically connected to the positive electrode of the DC power supply 11-1, and the other end is electrically connected to the train line 20-1 of the track 2-1. One end of the contactor 13-1 is electrically connected to the positive electrode of the DC power supply 11-1, and the other end is electrically connected to the train line 20-1 of the track 2-2. In substation 10-1, return line 22-1 of line 2-1 is electrically connected to return line 22-1 of line 2-2 by wiring 14-1.

The substation 10-2 further includes a contactor 12-2 and a contactor 13-2. One end of the contactor 12-2 is electrically connected to the positive electrode of the DC power supply 11-2, and the other end is electrically connected to the train line 20-3 of the track 2-1. One end of the contactor 13-2 is electrically connected to the positive electrode of the DC power supply 11-2, and the other end is electrically connected to the train line 20-3 of the track 2-2. In substation 10-2, return line 22-2 of line 2-1 is electrically connected to return line 22-2 of line 2-2 by wiring 14-2.

The control device 40 centrally controls the operation of the DC power supply system 1 . Further, the control device 40 controls the open/closed states of the contactors 12-1, 12-2, 13-1, 13-2, 24-1 and 24-2.

[5-2] Operation Next, the operation of the DC power feeding system 1 will be described.

The controller 40 closes the contactors 12-1, 12-2, 13-1, 13-2, 24-1 and 24-2. As a result, the substations 10-1 and 10-2 supply DC power to the lines 2-1 and 2-2.

Further, by closing the contactors 24-1 and 24-2, the line 2-1 and the line 2-2 form a parallel circuit. Therefore, the impedances of the lines 2-1 and 2-2 are reduced equivalently. As a result, when the regenerative brake of the train operates, the regenerated power can be transferred to the train far from the substation, and the regeneration rate can be improved. Also, during power running, the voltage drop in the feeder circuit can be reduced, and the loss in the feeder circuit can be reduced.

Next, the operation when a failure occurs on the lines 2-1 and 2-2 will be described.

When a failure occurs on the line 2-2, the controller 40 opens the contactors 13-1 and 13-2 and closes the contactors 12-1 and 12-2. In conjunction with the opening operation of the contactors 13-1 and 13-2, the control device 40 opens the contactors 24-1 and 24-2 to connect the lines 2-1 and 2-2. Separate electrically. Thereby, power supply to the line 2-1 can be continued and power supply to the line 2-2 can be stopped.

On the other hand, when a failure occurs in the line 2-1, the controller 40 opens the contactors 12-1 and 12-2 and closes the contactors 13-1 and 13-2. In conjunction with the opening operation of the contactors 12-1 and 12-2, the control device 40 opens the contactors 24-1 and 24-2 to connect the lines 2-1 and 2-2. Separate electrically. Thereby, power supply to the line 2-2 can be continued and power supply to the line 2-1 can be stopped.

[5-3] Effect of Fifth Embodiment According to the fifth embodiment, the line 2-1 and the line 2-2 form a parallel circuit. As a result, the power regeneration rate can be improved. Also, the voltage drop in the feeding circuit can be reduced.

Further, when a failure occurs in one of the lines 2-1 and 2-2, it is possible to stop the power supply to the non-failed line while continuing to supply power to the non-faulted line. . Thus, even when the lines 2-1 and 2-2 are connected in parallel, the influence of the failure can be minimized.

[6] Sixth Embodiment A sixth embodiment is an example in which the DC power supply system 1 further includes a power storage device.

FIG. 6 is a circuit block diagram of the DC power feeding system 1 according to the sixth embodiment. The DC power supply system 1 further includes a contactor 24 - 3 and a power storage device 60 .

One end of the contactor 24-1 is electrically connected to the contact line 20-1 of the track 2-1, and the other end is electrically connected to one end of the contactor 24-3. The other end of the contactor 24-3 is electrically connected to the contact line 20-1 of the track 2-2.

The power storage device 60 includes a power storage cell 61 , a power converter 62 and a contactor 63 . The electric storage cell 61 is also called an electric storage medium.

The storage cell 61 is composed of, for example, a storage battery such as a lithium-ion battery, a nickel-metal hydride battery, or a lead-acid battery. The storage cell 61 may be an electric double capacitor or an energy storage medium such as a flywheel.

The power converter 62 controls charging and discharging of the storage cell 61 . A positive line of the power converter 62 is electrically connected to one end of the contactor 63 . The other end of contactor 63 is electrically connected to the other end of contactor 24-1. The negative line of power converter 62 is electrically connected to return line 22-1 of line 2-1 and return line 22-1 of line 2-2 via line 25-1.

Control device 40 controls the operation of power storage device 60 .

Next, the operation of the DC power supply system 1 configured as described above will be described.

The controller 40 closes the contactors 12-1, 12-2, 13-1, 13-2, 24-1, 24-2, 24-3, 63. As a result, the substations 10-1 and 10-2 supply DC power to the lines 2-1 and 2-2. Also, the power storage device 60 is electrically connected to the line 2-1 and the line 2-2.

The power storage device 60 is discharged when the feeding voltage (voltage of the contact line) falls below the threshold voltage, and charged when the feeding voltage rises above the threshold voltage. As a result, regenerative electric power can be absorbed, and a voltage drop in the contact line can be suppressed.

The power storage device 60 may operate to lower the feeding voltage for discharging as the charging rate of the power storage cell 61 drops below the threshold. In addition, the power storage device 60 may operate to increase the feeding voltage for the charging operation as the charging rate of the power storage cell 61 rises above the threshold.

The regenerative current and powering current of the train increase at the end of the feeding circuit divided by the air section, and the fluctuation of the feeding voltage becomes large. Therefore, by arranging the power storage device 60 at the end of the feeder circuit as in the present embodiment, the power storage device 60 can absorb the regenerated electric power of the train existing at the end of the feeder circuit and reduce the voltage of the contact line. You can control the descent. Therefore, according to the sixth embodiment, more stable power supply is possible.

It should be noted that the sixth embodiment can also be applied to the first to fourth embodiments. That is, power storage device 60 may be applied to a single line.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1... DC feeding system 2-1, 2-2... Line, 10-1, 10-2... Substation, 11-1, 11-2... DC power supply, 12-1, 12-2... Contactor, 13 -1, 13-2 ... contactor, 14-1, 14-2 ... wiring, 20-1 to 20-4 ... contact line, 21-1 to 21-3 ... air section, 22, 22-1, 22- 2 Return line 23 Switching section 24-1 to 24-3 Contactor 25-1, 25-2 Wiring 30-1, 30-2 Feeder 31-1, 31-2 Diode 32-1, 32-2 Current detector 33-1, 33-2 Control circuit 34-1, 34-2 Contactor 40 Control device 50 Impedance 60 Power storage device 61... Storage cell, 62... Power converter, 63... Contactor, 100... Electric train.

Claims (11)

a first train line connected to a first DC power supply;
a second contact line connected to the first contact line via an air section;
a first diode having an anode connected to the first train line and a cathode connected to the second train line;
a third train line connected to a second DC power supply;
a fourth contact line connected between the second contact line and the third contact line via an air section;
a second diode having an anode connected to the third train line and a cathode connected to the fourth train line;
A DC power supply system comprising: a first current detector connected between the first train line and the first diode for detecting a current flowing through the first diode;
a second current detector connected between the third train line and the second diode for detecting a current flowing through the second diode;
The DC power supply system of claim 1, further comprising: a first contactor connected between the first train line and the first diode;
a second contactor connected between the third contact line and the second diode;
The DC power supply system of claim 2, further comprising: a first control circuit that opens the first contactor based on the detection result of the first current detector;
a second control circuit that opens the second contactor based on the detection result of the second current detector;
The DC power supply system according to claim 3, further comprising: first and second tracks;
first and second contactors;
and
Each of the first and second lines is
a first train line connected to a first DC power supply;
a second contact line connected to the first contact line via an air section;
a first diode having an anode connected to the first train line and a cathode connected to the second train line;
a third train line connected to a second DC power supply;
a fourth contact line connected between the second contact line and the third contact line via an air section;
a second diode having an anode connected to the third train line and a cathode connected to the fourth train line;
including
One end of the first contactor is connected to the first contact wire of the first track, the other end of the first contactor is connected to the first contact wire of the second track,
One end of the second contactor is connected to the third contact line of the first track, and the other end of the second contactor is connected to the third contact line of the second track, DC power supply system . a third contactor connected between the first DC power supply and the first contact line of the first track;
a fourth contactor connected between the first DC power supply and the first contact line of the second track;
a fifth contactor connected between the second DC power supply and the third contact line of the first track;
a sixth contactor connected between the second DC power supply and the third contact line of the second track;
The DC power supply system according to claim 5, further comprising: 7. The DC power feeding system according to claim 6, further comprising a control device that opens said first and second contactors in conjunction with the operation of opening said third and fifth contactors. The DC power supply system according to any one of claims 1 to 7, further comprising a power storage device connected to the first power line. The power storage device includes a power storage cell,
The DC power supply system according to claim 8, wherein the power storage device operates to decrease the voltage of the first contact line as the charging rate of the power storage cell decreases below a threshold. The DC power feeding system according to claim 9, wherein the power storage device operates to increase the voltage of the first contact line as the charging rate of the power storage cell rises above a threshold. a first return line connected to the negative electrode of the first DC power supply;
a second return line connected to the negative electrode of the second DC power supply;
further comprising
The DC power supply system according to any one of claims 1 to 10, wherein the first return line and the second return line are insulated.

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