JPS62214028A - D.c. feeder - Google Patents

Abstract

PURPOSE:To ensure proper conduct at any accident to the power running bus- line, regenerative bus-line or the like for improved reliability as well as to reduce the manufacturing cost by providing a circuit in which power running current, regenerative current or the like of electric overhead lines can be cut off by a set of circuit breaker. CONSTITUTION:Operations of supplying power running current to first to fourth electric overhead lines 9a, 9b, 10a, 10b and controlling resultant regenerative current are controlled only by a set of thyristor breaker 23, diode bridge circuits 21, 41, and a diode series circuit 30. Thus, the number of thyristor breakers 23 is reduced by three pairs in comparison with the conventional arrangement, allowing reduction of cost of the whole arrangement. Furthermore, for example when a grounding accident occurs at a point F1 in the electric overhead line 9a, the thyristor breakers 23 are opened to cut off the power running current, and then, after a d.c. disconnector 8a is opened, the thyristor breakers 23 are again closed, permitting feed of the power running current to the electric overhead lines 9b, 10a, 10b.

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention relates to a power supply device for electric railways, and more particularly to a power supply device for DC type electric railways that converts AC power into DC power and supplies it as a drive source for electric cars. Regarding.

B0 Summary of the Invention This invention provides a power supply system for a DC electric railway equipped with overhead contact lines divided by dead sections to form double tracks, in which a circuit breaker is installed so that current during power running and current during regeneration flow through the same circuit breaker. By combining the circuit breaker with two sets of diode bridge circuits and allowing regenerative current to flow through the circuit breaker, it is possible to significantly improve the reliability of the system in the event of an accident on the electric track side or a DC bus accident, and also to It also allows for effective use of electric current.

C1 Prior Art Conventionally, DC substations installed at appropriate intervals along railway lines are configured with one to several sets of converters. Further, the DC output side of each converter is connected to a DC high-speed circuit breaker dedicated to the converter, and the AC input side of the converter is connected to a common bus conductor. That is, a power supply system including a forward power converter and a DC high-speed circuit breaker is connected in parallel between substations to constitute a DC power source of the DC substation.

On the other hand, tram tracks are generally divided between adjacent substations and by track, and the tram tracks are connected to their respective positive bus bars at each substation via DC high-speed circuit breakers dedicated to each line. Connected to the negative bus.

Generally, adjacent substations are configured as a power supply circuit that supplies power in parallel to the divided electric train tracks.

Figure 4 shows a conventional power supply device, in which 1 is a forward power converter consisting of a cyrisk control element that converts AC power into DC power, 2
is an inverse power converter consisting of a cyrisk control element that converts DC power to AC power.

7 is a DC bus bar, 4a to 4d are Zyristor circuit breakers for power running (
5a to 5d are regeneration diodes, and the anode sides of these diodes 5a to 5d are connected to the cathodes of the powering circuit breakers 4a to 4d, and the cathodes of the diodes 5a to 5d are connected together. It is connected to the anode of a regenerative Zyristor circuit breaker 6 (hereinafter referred to as a regenerative circuit breaker). A cathode of the regenerative circuit breaker 6 is connected to the reverse power converter 2 and also to the DC bus 7 . 8a to 8d are DC disconnectors, 9a, 9b and 10a, and IQb are separated by dead sections 11 and 12, forming a double track. 2nd and 3rd. This is the 4th train track.

Next, the operation shown in FIG. 4 will be described. First, power for powering an electric vehicle is obtained by converting the three-phase AC voltage received from a commercial frequency power bus (not shown) through an AC breaker (not shown) into an appropriate voltage using a transformer (not shown) at a substation. The forward power converter 1 converts the DC power to =8-, and the divided 1st. Second train track 9a.

911 and 3rd. It is supplied to the fourth electric train tracks 10a and 10b.

The electric cars 13 on the fourth overhead contact line 10b are powered by the DC power supplied as described above.

Next, when the electric car 13 is in regenerative operation, the regenerative power is transferred from the fourth overhead contact line 10b to the disconnector 8c and the regenerative diode 5.
It is supplied to the DC bus 7 via C and the regenerative circuit breaker 6.

The regenerated power supplied to the bus 7 is regenerated to the first to third contact tracks 9a to 10a on which power running electric cars (not shown) are operated, or is passed through the inverse power converter 2 to the power supply bus. will be regenerated.

D1 Problems to be Solved by the Invention In the device configured as described above, the forward power converter 1 and the reverse power converter 2 are directly connected in anti-parallel via the DC bus 7, so that the reverse power There is a problem in that when the converter 2 fails in commutation, a fault current is supplied from the forward power converter 1 side and the fault is magnified.

In addition, in the configuration shown in FIG. 2nd and 3rd degree 4th electric train tracks 9a, 9b, 10a, 1. In order to supply DC power to the power running circuit breakers 4a, 4b, 4c, and 4d, the power must be supplied separately through the power running circuit breakers 4a, 4b, 4c, and 4d, which poses a problem in that four power running circuit breakers are required. Furthermore, a regenerative circuit breaker 6 is required in order to supply the regenerative power of the electric car generated on one tramway to the other tramway or to regenerate it to the reverse power converter 2 side. Zyristor circuit breaker is 5
In addition, the substation equipment will become larger. This resulted in problems such as increased equipment costs for substation construction. In addition to the above, power running circuit breakers 4a, 4b, 4c
, 4d and the regenerative circuit breaker 6 have different properties and purposes, so there is a problem that the control means (protection sequence) becomes extremely complicated.

E. Means for Solving Problems This invention provides a first diode bridge circuit formed by bridge-connecting diodes, and a diode bridge circuit connected between a commonly connected cathode side and an anode side of the first diode bridge circuit. A circuit breaker, a second diode bridge circuit formed by bridge-connecting diodes and connected in parallel to the circuit breaker, and cathodes and anodes of diodes constituting each side of the first and second diode bridge circuits. The first line is connected separately to a commonly connected connection point and separated by a dead section forming a double track. 2nd and 3rd. A fourth overhead contact line, a diode series circuit connected in parallel to the circuit breaker, a power running bus connected to a common connection point of the diode series circuit, and a power running bus connected to the power running bus to convert AC power into DC power. a forward power converter to convert, and a regeneration bus bar connected to the commonly connected anode sides of the first and second diode bridge circuits;
It is characterized by comprising a reverse power converter that is connected to the regeneration bus and converts DC power into AC power.

If configured as shown in section 2 of ``F9 action'', 1. Second. Third. There are only two sets of circuit breakers in the circuit that supplies DC power to the No. 4 overhead contact line, and these two sets of circuit breakers can cut off the power running current, regenerative current, etc., and also cut off the power running current, regenerative current, etc. Even in the event of an accident, it can be reliably dealt with by shutting off the circuit breaker. Furthermore, since the power running nine regenerative currents can be controlled using two sets of circuit breakers, the device can be manufactured at extremely low cost, which is economically advantageous.

G. Embodiment (z) Embodiment of the First Invention FIG. 1 is a circuit diagram showing an embodiment of the first invention, and the same parts as in FIG. 4 will be described with the same reference numerals.

In FIG. 1, 21 and 41 are four diodes 22a to 22d and 42a to 4 arranged as shown in the polarity.
2d. A common connection point 26 between the diodes 22a and 22b is connected to the first overhead contact line 9a via a DC disconnector 8a. Common connection point 2 of the diodes 22c and 22d
7 is connected to the third overhead contact line 10a via a DC disconnector 8b. Common connection point 4 of the diodes 42a and 42b
6 is connected to the second electric train line 9b via a DC disconnector 8C. A common connection point 47 between the diodes 42c and 42d
is connected to the fourth overhead contact line 10b via a DC disconnector 8d. A common connection point 24 on the cathode side of the diodes 22a, 22c is connected to a common connection point 44 on the cathode side of the diodes 42a, 42c. Diode 22b, 2
The common connection point 25 on the anode side of 2d is the diode 42b.
, 42d are connected to the anode side common connection point 45.

23 is a thyristor circuit breaker (this circuit breaker may be a DC high-speed circuit breaker); the anode of the circuit breaker 23 is connected to the common connection point 44 on the cathode side of the diodes 42a, 42c, and the cathode is connected to the cathode side common connection point 42 of the diodes 42b, 42d. It is connected to the anode side common connection point 45 of. A diode series circuit 30 in which diodes 31 and 32 of the illustrated polarity are connected in series is connected to the thyristor circuit breaker 23 in parallel. A common connection point 33 between the diodes 31 and 32 is connected to the power running (DC) bus 7.

Note that the forward power converter l shows a diode rectifier, but
It may also be a thyrisk rectifier.

Next, the operation of the above embodiment will be described. Cyrisk circuit breaker 23
When normally closed, the power running current of the forward power converter I is as follows: power running bus 7 - diode 31 -> Cyrisk circuit breaker 23 -> diodes 22b, 42b, 22d.

42d - First to fourth overhead contact lines 9a, 9b, 10a, 1 via DC disconnectors 8a, 8c, 8b, 8d
0b, respectively.

The regenerative current generated in the 4th overhead contact line IQb is as follows: DC disconnector 8d - diode 42c → Cyrisk circuit breaker 23 → diodes 22b, 42b, 22d → DC disconnector 8a
, 8c.

8b through the first. Second. 3rd train track 9a, 9b,
1Oa is supplied. In addition, 1st. Second. 3rd train track 9
a.

The regenerative currents generated in 9b and 10a are also connected to the guide circuit 21.41. The circuit breaker 23 flows through a diode series circuit 30.

As mentioned above, the first to fourth electric train tracks 9a, 9b, 10
a.

When powering current is supplied to 10b, control can be performed using only one set of thyristor circuit breakers 23, diode bridge circuits 21, 41, and diode series circuits 30, so there is an advantage that three sets of thyristor circuit breakers can be omitted compared to conventional ones. be. This allows the entire power supply device to be manufactured at low cost. Moreover, the first to fourth electric train tracks 9a.

When controlling the regenerative current generated in the regenerative currents 9b, 10a, and 10b, the same advantages as described above can be obtained because the control can be performed using only the SIRISK circuit breaker 23, the diode bridge circuit 21, 41, and the diode series circuit 30.

Furthermore, both the power running current and the regenerative current are connected to the Cyrisk circuit breaker 2.
3, so if the Cyrisk breaker 23 is opened, both types of flows for power running and first regeneration can be shut off with a single Cyrisk circuit breaker 23. By using the Cyrisk circuit breaker which has the function of interrupting both types of flow in the power running 9 regeneration, for example, when a ground fault occurs at point F1 of the overhead contact line 9a in Fig. 1, the Cyrisk circuit breaker 23 can be opened. If this is done, the power running current will be cut off. Thereafter, if the DC disconnector 8a is opened and the thyristor circuit breaker 23 is closed, the second, third, and so on. There is no problem with the operation of power-running electric cars running under the fourth overhead contact lines 9b, 10a, and 10b.

In the above embodiment, if a ground fault occurs at point F2 of the power running bus 7, the regenerative current generated on the first to fourth contact lines 9a, 9b, 10a, and 10b can be reduced by shutting off the SIRISK circuit breaker 23. are DC disconnectors 8a, 8c, 8b,
8d → diode 22a, 42a, 22c, 4
2cm> It is possible to prevent the risk from flowing into the accident point F through the route between the circuit breaker 23 and the diode 32. Also,
At this time, the extended power supply current flowing from the adjacent substation can be prevented from flowing into the fault point F through the same path as described above.

Therefore, it is possible to prevent the power outage from spreading to other substations. Further, since only one thyristor circuit breaker 23 is required for each of the four electric train lines, there is an advantage that the circuit breaker control device and its handling are simple.

G. Embodiment of the Second Invention Next, an embodiment of the second invention will be described with reference to FIG. In FIG. 2, the same parts as in FIG. 1 are shown with the same reference numerals, and their explanation will be omitted. The difference in Fig. 2 from Fig. 1 is that the regenerative current can be regenerated to the reverse power converter 2 side, and diodes 22b, 22d, 42b
, 42d, 32 anode side common connection point 25.45
is connected to the regeneration bus 29. A reverse power converter 2 that converts DC power into an AC horn is connected to the regeneration bus 29. In FIG. 2, the forward power converter l may be a thyristor rectifier.

In the second embodiment, the operation during power running and in the event of an accident is the same as the circuit shown in FIG. 1, so a description thereof will be omitted. The regenerative current generated in the fourth overhead contact line 10b is transferred to the DC disconnector 8
d→Diode 42cm Zyristor circuit breaker 23-Diode 22b, 42b, 22d→DC disconnector 8a,
8c, 1st via 8b. Second. 3rd train track 9a,
9b, 10a, or is regenerated to a commercial frequency power source (not shown) via the DC disconnector 8d, the diode 42cm circuit breaker 23, the regeneration bus 29, and the reverse power converter 2. In addition, 1st. 2nd and 3rd tram tracks 9a, 9b, 1. The regenerative current generated in Oa also flows through the diode bridge circuits 21, 41 . , diode series circuit 30. It flows through the thyristor circuit breaker 23 and is either supplied to each overhead contact line or regenerated to the reverse power converter 2.

In addition, in the second embodiment, if a ground fault occurs at point F3 of the regeneration bus 29, the thyristor circuit breaker 23 can be shut off. Second. Third. 4th train track 9a,
The regenerative current generated in 9b, IOa, 1Ob is transferred to DC disconnector 8a, 8c, 8b, 8d → diode 2
2a, 42a.

It is possible to prevent the water from flowing into the accident point F3 through the path of the 22c and 42cm thyristor circuit breaker 23. Further, at this time, it is possible to prevent the current flowing from the adjacent substation from flowing into the fault point F3 through the same path as described above.

Therefore, it is possible to prevent the power outage from spreading to other substations.

Furthermore, in the above embodiment, a diode 32 is connected between the power running bus 7 and the regeneration bus 29 in accordance with the illustrated polarity, so even if the reverse power converter 2 fails to commutate, the diode 32 It is possible to prevent fault current from flowing into the power converter 2 side. Thereby, even if there is a commutation failure in the reverse power converter 2, the expansion of the accident can be prevented.

G3. Embodiment of the third invention Next, an embodiment of the third invention will be described with reference to FIG. In FIG. 3, the same parts as in FIG. 2 are shown with the same reference numerals, and the explanation thereof will be omitted. The diodes 42b, 42
The anode of the stopper diode 28 is connected to the anode side common connection point 45 of d.

The cathode of this stopper diode 28 is connected to the anode of the diode 32 and the regeneration bus 29. A bidirectional power converter 34 that converts DC power into AC power or AC power into DC power is connected to the regeneration bus 29.

In addition, in FIG. 3, the forward power converter 1 may be a Sirisk rectifier.

Next, the operation of the above embodiment will be described.

When the Cyrisk circuit breaker 23 is normally closed, the power running current of the forward power converter 1 is transferred from the power running bus 7 to the diode 3.
1 → Zyristor circuit breaker 23 → diode 22b, 42
b, 22d, 42d → DC disconnector 8a, 8c,
8b, 8d to the first, second, . Third. 4th train tracks 9a, 9b.

10a and 10b.

In addition, the regenerative current generated in the fourth overhead contact line 10b is transferred from the DC disconnector 8d to the diode 42cm circuit breaker 23→
Diodes 22b, 42b, 22d → first via DC disconnectors 8a, 8c, 8b. Second. Third train track 9a, 9b.

10a, or is regenerated to the commercial frequency power supply side (not shown) via the DC disconnector 8d → diode 42cm Zyristor circuit breaker 23 - stopper diode 28 - regeneration bus 29 - bidirectional power converter 34. .

In addition, 1st. Second. 3rd train track 9a, 9b, 10a
Similarly to the above, the regenerative current generated in the diode bridge circuit 21.4I and the Cyrisk circuit breaker 23. It flows through the stopper diode 28 and is either supplied to each overhead contact line or regenerated to the bidirectional power converter 34.

In addition, the diode 32 connects the power running bus 7 and the regeneration bus 29.
Since the diode 32 is inserted between the bidirectional power converter 34 and the bidirectional power converter 34, even if the bidirectional power converter 34 fails in commutation during reverse power conversion operation, the diode 32 can prevent a fault current from flowing into the bidirectional power converter 34 side. Thereby, even if there is a commutation failure during the reverse power conversion operation of the bidirectional type -23= force converter 34, the expansion of the accident can be prevented.

As mentioned above, the first. Second. Third. 4th train track 9a,
When supplying power running current to 9b, 10a, 10b,
Since control can be performed using only one set of the SIRISK circuit breaker 23, the diode bridge circuit 21, 41, and the diode series circuit 30, there is an advantage that three sets of SIRISK circuit breakers 23 can be omitted compared to the conventional system. This allows the entire power supply device to be manufactured at low cost. Also, 1st degree, 2nd degree. Third. When controlling the regenerative current generated in the fourth overhead contact lines 9a, 9b, loa, and lOb, the same advantages as described above can be obtained because the control can be performed using only the SIRISK circuit breaker 23, the diode bridge circuit 21, 41, and the stopper diode 28. be.

Furthermore, both the power running current and the regenerative current are connected to the Cyrisk circuit breaker 2.
3, so if the Cyrisk breaker 23 is opened, both types of flows of the 5th regeneration of power running can be shut off with the single Cyrisk circuit breaker 23. By using the Cyrisk circuit breaker that has the function of interrupting both types of flow for power running and regeneration, for example, when a ground fault occurs at point F1 of the overhead contact line 9a in Fig. 3, the Cyrisk circuit breaker 23 can be opened. If this is done, the power running current will be cut off. Thereafter, if the DC disconnector 8a is opened and the Cyrisk circuit breaker 23 is closed, the second, third, and so on. 4th train track 9b, 1. Oa, 10
There is no problem with the operation of electric powered cars running under b.

In the above embodiment, if a ground fault occurs at point F2 of the power running bus 7, the SIRISK circuit breaker 23 can be shut off. Second. Third. 4th train track 9a, 9b,
The regenerative current generated in 10a and 10b is connected to the DC disconnector 8a.
, 8c, 8b, 8d → diode 22a, 42
a, 22c, 42c - risk circuit breaker 23 -> stopper diode 28 - diode 32 can be prevented from flowing into the fault point F2. Further, at this time, the extended power supply current flowing from the adjacent substation can be prevented from flowing into the fault point F through the same path as described above. Furthermore, if a ground fault occurs at point F3 of the regeneration bus 29, the SIRISK circuit breaker 23 can be shut off. 2nd゜3rd.
The regenerative current generated in the fourth overhead contact lines 9a, 9b, 10a, 10b is connected to the DC disconnectors 8a, 8c, 8b, 8.
d-diodes 22a, 42a, 22c, 42c
It is possible to prevent the water from flowing into the accident point F3 through the path of →Sirisk circuit breaker 23 →stopper diode 28. Further, at this time, it is possible to prevent the current flowing from the adjacent substation from flowing into the fault point F3 through the same path as described above.

Therefore, it is possible to prevent the power outage from spreading to other substations. Further, since only one SIRISK circuit breaker 23 is required for each of the four electric train lines, there is an advantage that the circuit breaker control device and its handling are simple.

Here, when the bidirectional power converter 34 is operated in a similar force conversion operation, the power running current flowing from the converter 34 flows through the following path. That is, bidirectional power converter 34 - diode 3
2.31-Sirisk circuit breaker 23 → diode 22b,
42b, 22d, 42d DC disconnector 8a, 8c
, 8b.

1st via 8d. Second. Third. 4th train track 9a.

9b, 10a, 10b. By causing the bidirectional power converter 34 to perform similar force conversion operations and supplying power running current in this way, it is possible to reduce the capacity of the forward power converter 1, and even in the event of a failure of the forward power converter 1, it is possible to cause a power outage at the substation. Powering current can be supplied without any trouble. In addition, Cyrisk circuit breaker 23
Since the stopper diode 28 with the illustrated polarity is connected between the cathode side common connection point 45 and the regeneration bus bar 29, the power running current supplied from the bidirectional power converter 34 does not pass through the Cyrisk circuit breaker 23 but directly. It is possible to prevent the current from flowing to the diode bridge circuit 21.41.

In the second invention, the diode 32 may be deleted and the powering bus 7 and the regeneration bus 29 may be separated.

■] Effects of the invention As described above, according to the present invention, the following effects can be obtained.

a. Compared to the conventional example, there is no need for a regenerative circuit breaker and three sets of power running circuit breakers, so equipment costs are very advantageous.

In addition, one set of circuit breakers can interrupt the power running current once -28 = main current, fault current, and extended power supply current from an adjacent substation, greatly simplifying the equipment and simplifying the protection sequence. This improves reliability.

b. Since a diode is inserted between the power running bus and the regeneration bus, even if commutation fails during reverse power conversion, fault current from the forward power converter flows into the reverse power converter or bidirectional converter side. Since this can be blocked by a diode, it is possible to prevent an accident from occurring in a reverse power converter or a bidirectional converter from expanding.

C9 Even if a ground fault occurs on one tramway, if you open the DC disconnector connected to that line after opening the breaker, and then close the breaker, there will be a regenerative electric car on the other tramline. Even if the regenerative current is regenerated, it is possible to regenerate the regenerative current.

d.In the event of an accident on the train track side or a DC bus (for power running 1 regeneration) accident, opening the circuit breaker will prevent the accident from spreading, which will significantly improve the reliability of the system. There is.

e. If a ground fault occurs during extended power supply, the extended power supply current will be interrupted by the breaker connected to the faulty line, so there is no need to interrupt the extended power supply current at the adjacent substation that supplies the extended power supply current.

Therefore, the protection sequence can be further simplified and the impact of accidents can be minimized.

f. The current flowing through the four overhead contact lines can be interrupted by the same circuit breaker, so there is no potential difference between the sections. Therefore, there is no need to compensate for potential differences between sections. Also, electric cars are the first. 2nd line from the 3rd train track. To the 4th train track or to the 2nd. From the 4th train track to the 1st
．． Since the train runs to the third overhead contact line, the current capacity of the circuit breaker does not necessarily require the capacity for four contact lines.

g. GTO (gate turn-off risk) on circuit breaker
When a circuit breaker is used, when the regenerative current is cut off by the regenerative circuit breaker 6 in a conventional device, for example, the circuit shown in FIG. Ru. Generally, GTO has a self-extinguishing function, so it is not used to apply a reverse bias voltage. Therefore, in order to use a GTO as a circuit breaker in the circuit shown in FIG. 4, the reverse voltage withstand capability of the GTO element must be increased, which results in an expensive device and is economically disadvantageous. On the other hand, when a GTO is used as a circuit breaker in the circuit of the present invention, the reverse voltage applied from the power running bus 7 is blocked by the diode 32 and the stopper diode 28, and the reverse voltage applied from the overhead contact lines 9a, 9b, lOa, and 10b is The reverse voltage generated by the diodes 22b, 22d, 42b, 4
Blocked by 2d. For this reason, circuit breakers (G T O
Since no reverse voltage is applied to the circuit breaker (using circuit breaker), a general GTO can be used. This makes it possible to manufacture an inexpensive device, which is very economically advantageous.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the first invention, Fig. 2 is a circuit diagram showing an embodiment of the second invention, Fig. 3 is a circuit diagram showing an embodiment of the third invention, and Fig. 4 is a circuit diagram showing an embodiment of the third invention. The figure is a circuit diagram of a conventional example. 1...Forward power converter, 2...Reverse power converter, 7...
・Power running bus bar, 9a, 9b, 10a, 10b-・
・Train track, 11.12...Dead section, 21
．． 41... Diode bridge circuit, 23... Thyristor breaker, 28... Stopper diode, 29...
・Regeneration bus bar, 30... Diode series circuit, 34...
Bidirectional power converter.

Claims (3)

[Claims] (1) A first diode bridge circuit formed by connecting diodes in a bridge manner, a circuit breaker connected between the commonly connected cathode side and anode side of this first diode bridge circuit, and diodes connected in a bridge manner. a second diode bridge circuit connected in parallel to the circuit breaker, and a connection point where the cathodes and anodes of the diodes constituting each side of the first and second diode bridge circuits are commonly connected; first, second and third sections connected and separated by a dead section forming a double track;
A fourth overhead contact line, a diode series circuit connected in parallel to the circuit breaker, a power running bus connected to a common connection point of the diode series circuit, and a power running bus connected to the power running bus to convert AC power into DC power. A direct current power supply device comprising a forward power converter for converting power. (2) A first diode bridge circuit formed by bridge-connecting diodes, a circuit breaker connected between the commonly connected cathode side and anode side of this first diode bridge circuit, and diodes connected in bridge-connection. a second diode bridge circuit connected in parallel to the circuit breaker, and a connection point where the cathodes and anodes of the diodes constituting each side of the first and second diode bridge circuits are commonly connected; first, second and third sections connected and separated by a dead section forming a double track;
A fourth overhead contact line, a diode series circuit connected in parallel to the circuit breaker, a power running bus connected to a common connection point of the diode series circuit, and a power running bus connected to the power running bus to convert AC power into DC power. a forward power converter for converting; a regeneration bus connected to the commonly connected anode sides of the first and second diode bridge circuits; and a regeneration bus connected to the regeneration bus for converting DC power into AC power. A DC power supply device comprising a reverse power converter. (3) A first diode bridge circuit formed by connecting diodes in a bridge manner, a circuit breaker connected between the commonly connected cathode side and anode side of this first diode bridge circuit, and diodes connected in a bridge manner. a second diode bridge circuit connected in parallel to the circuit breaker, and a connection point where the cathodes and anodes of the diodes constituting each side of the first and second diode bridge circuits are commonly connected. a first, a second and a third separately connected and separated by a dead section forming a double track;
a fourth overhead contact diode, a stopper diode whose anode is connected to the commonly connected anode side of the first and second diode bridge circuits; and a cathode of the stopper diode and the first and second diode bridge circuits. A diode series circuit connected between the commonly connected cathode side, a power running bus connected to the common connection point of this diode series circuit, and a power running bus connected to this power running bus to convert AC power to DC power. a regeneration bus connected to the cathode of the stopper diode; and a bidirectional power converter connected to the regeneration bus and converting DC power into AC power or AC power into DC power. A DC power supply device characterized by comprising: