JPS62225431A - D.c. power supply device - Google Patents

Abstract

PURPOSE:To enhance the reliability of a system during a failure on the trolley line side or the D.C. power bus side, and to make it possible to effectively use recovery current, by combining breakers and a diode bridge circuit so that current flows through one and the same breaker during power running operation and recovery operation, and by allowing the recovery current to flow through the same breaker. CONSTITUTION:The connecting point 46 between diodes 42a, 42b in a bridge circuit 41 is connected to a first trolley line 9a through a breaker 8a, and the connecting point between diodes 42c, 42d is connected to a second trolley line 9b. Further, the connecting point 53 between the diodes 31, 32 connected in series in a series circuit 30 is connected to a third trolley line 9c. A thyristor breaker 43 is connected between both common connecting points 44, 45. With this arrangement, only one set of breakers 43 are used in the circuits for the first, second and third trolley lines. Further, power running current and recovery current may be surely cut off. It is possible to surely cope with failures in the buses and the like by cutting off these buses. Further, recovery current from the trolley lines may be effectively used, and it is possible to produce the power feed device at a low cost since only one set of breakers along used.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a power supply device for electric railways, and in particular to a power supply device for electric railways that converts AC power into DC power and supplies it as a drive source for electric cars. Regarding equipment.

B4 Summary of the Invention This invention provides a power supply system for a DC electric railway equipped with overhead contact lines divided into double sections, in which a circuit breaker and a By combining it with a diode britsuno circuit and allowing regenerative current to flow through the circuit breaker, the reliability of the system in the event of an accident on the contact line side or a DC bus accident can be significantly improved. This makes it possible to effectively utilize regenerative current from overhead contact lines divided into double sections.

C9 Prior Art Conventionally, a DC substation installed at appropriate intervals along a railway line is configured with one or several sets of converters. In addition, 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 that device is connected to the bus conductor of the A power supply system including a converter and a DC high-speed circuit breaker is connected in an 11ζ series 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 on the track side, 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, and is connected to the negative bus.

Generally, the divided overhead contact line is configured as a power supply circuit that supplies power from adjacent substations in parallel.

Figure 4 shows an example of a conventional power supply device, where I is a forward power converter consisting of a Zyristor control element that converts AC power to DC power, and 2 is a reverse power converter consisting of a Zyristor control element that converts DC power to AC power. It is a converter. 3 is the DC bus,
4a, 4b, 4c are Zyristor circuit breakers for power running (hereinafter referred to as power running circuit breakers), and 5a.

5b and 5c are regeneration diodes. The anode side of these diodes 5a, 5b, and 5c is a power running circuit breaker 4a.

4b and 4c, and the cathodes of diodes 5a and 5J 5c are connected together and connected to the anode of a regenerative Zyristor circuit breaker 6 (hereinafter referred to as a regenerative circuit breaker). Regeneration cutoff 2: (The cathode of 6 is connected to the DC bus 3. The reverse power converter 2 is connected to the DC bus 3. 8a, 8b, 8c are DC disconnectors, 9a, 9b, 9c are dead Section lla,
1st section divided by llb. Second. This is the third train track.

The power supply device shown in FIG. 11 is of a so-called double section type, which takes measures against section overflow. Zunawashi, divided into sections? If a ground fault occurs on one of the electric train tracks and an electric car passes through the section, an arc is not generated due to the potential difference between the electric cars. This prevents the pantograph from being damaged by the arc.

Next, the operation shown in FIG. 4 will be described. First, the electric power for the horn-bound operation of the electric car is generated from a commercial frequency electrical system (not shown) at a substation (3-phase AC voltage received from the bus through an AC circuit breaker (not shown) is converted to an appropriate voltage by a transformer (not shown). The electric power is converted into direct current power by a forward power converter I, and is supplied to a 7U electric car I2 via divided overhead contact lines 9a, 9b, and 9c. Powered by DC power.

Next, when the electric car 12 located under the electric train track 9b is in regenerative operation, the regenerative power is transferred from the calculator track 9b to the DC disconnector 8.
b, is supplied to the DC bus 3 via the regenerative diode 5b and the regenerative circuit breaker 6. Regeneration 1 supplied to this bus 3
One power is regenerated to the electric train tracks 9a and 9c on which power running electric cars (not shown) are operated, or to the commercial frequency power supply bus via the inverse power converter 2.

D1 Problems to be Solved by the Invention In the device configured as described above, the class 1U force converter 1 and the reverse power converter 2 are directly connected in anti-parallel via the DC bus 3. When the commutation of converter 2 fails, the forward power converter! There is a problem that the fault current is supplied from the side and the fault is magnified.

In addition, in the configuration shown in FIG. Second. 3rd train track 9a
, 9b, 9c, it is necessary to supply power through the circuit breakers 4a, 4b, 4c for motor 17 separately, and there is a problem that three circuit breakers for power running are required. be. Furthermore, the regenerative power of electric cars generated on one tramway side is supplied to the other tramway, and the reverse power converter 2
In order to regenerate to the side, a regeneration circuit breaker 6 is required. For this reason, four or more expensive cyrisk circuit breakers are required, which increases the size of the substation equipment. This led to problems such as the equipment costs involved in substation construction becoming expensive. In addition to the above, since the power running circuit breaker 2, 4a, 4b, 4c and the regeneration circuit breaker 6 have different properties and purposes, there is a problem that the control means (protection sequence) becomes extremely complicated.

Means for Solving Problem E1 This invention provides a diode bridge circuit formed by bridge-connecting diodes, and a three-way circuit of this diode bridge circuit.
When the cathodes and anodes of the diodes constituting the side are connected separately to the common connection point, the first side is separated by a dead section. A 271i traffic lane, a first diode series circuit connected between the commonly connected anode side and cathode side of the diode bridge circuit, and a common connection point of the first diode series circuit, and Said 1st. A dead section is provided between the second train track and the third train track.
a circuit breaker connected between an electric train track and a commonly connected anode side and a cathode side of the diode bridge circuit;
A second diode series circuit connected in parallel to this circuit breaker and a power iT connected to a common connection point of this second diode series circuit +? 1 line, a forward power converter connected to the power running bus and converting AC power into DC power, and a regeneration bus connected to the commonly connected anode side of the diode bridge circuit. The present invention is characterized by comprising a reverse power converter connected to the regeneration n) line and converting DC power into AC power.

F9 action If configured as above, No. 2, No. 2. The circuit that supplies DC power to the 3rd 1u lane has only one set of 2K circuit breakers, and moreover, it is powered by one set of circuit breakers;'ti style.

Being able to shut off regenerative current, etc. also helps in the event of an accident with the power running bus or regenerative bus. Be sure to deal with 91 failures every time you turn off the circuit breaker. In addition, since one set of circuit breakers can control nine regenerative currents in power running, the device can be manufactured at extremely low cost, which is economically advantageous.

G, Example G3. First Embodiment of the Invention FIG. 1 is a circuit diagram showing an embodiment of the present invention, and the same parts as in FIG. 4 will be described with the same reference numerals.

In FIG. 1, 41 indicates 4
This is a diode bridge circuit composed of diodes 42a to 42d. This diode bridge circuit 4
Common connection point 46 of diodes 42a and 42b in 1
is connected to the 17th ri lane 9a via a DC disconnector 8a. Further, the common connection point 47 of the diodes 42c and 42d of the diode bridge circuit 4) is connected to a DC disconnector 8.
1+ to the second electric train line 9b.

30 is a diode series circuit consisting of diodes 31 and 32 connected in series, and this diode series circuit 30
The cathode of the diode 31 is connected to the common connection point 44 on the cathode side of the diode Britno circuit 41. n
ij: The anode of the self-diode 32 is connected to the anode side common connection point 45 of the diode bridge circuit 41. A common connection point 33 between diodes 31 and 32 is connected to the 37th ti laneway 9C via a DC disconnector 8C.

A Zyristor circuit breaker 43 having the illustrated polarity is connected between a point 44 where the cathodes of the diodes 42a and 42c are commonly connected and a point 45 where the anodes of the diodes 42b and 42d are commonly connected.

60 is a diode series circuit consisting of diodes 61 and 62 connected in series, and this diode series circuit 60
The anode side of the diode 62 is connected to the diode 42b.
, 42d are connected to the anode side common connection point II5. Further, the cathode side of the diode 61 is connected to the common connection point 44 on the cathode side of the diodes 42a and 42c. A common connection point 63 of the diodes 61 and 62 is connected to the power running (DC) bus 3.

In FIG. 1, the forward power converter l may be a Zyristor rectifier.

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

When the Zyristor circuit breaker 43 is normally closed, the powering current of the class 7U force transducer l is The first, second . It is supplied to the 37th Ii lanes 9a, 9b, and 9c.

Also, the second. -d The regenerative current generated in the single line 9b is connected to the DC disconnector 8b, the diode 42c, and the Zyristor circuit breaker 4.
3-・Tie auto 42b-first via DC disconnector 8a
It is supplied to the electric line 9a or the DC disconnector 8b.
- Diode 42cm Sairisk circuit breaker 43 → Guiode: 32 - 371i lane 9 via DC disconnector 8C
C.

In addition, 1. The regenerative currents generated in the third overhead contact lines 9a and 9c similarly flow through the diode bridge circuit 41 and the diode series circuit 30, and are supplied to each overhead contact line.

”The power running current is passed through each electric train line 9a, 9b, like two legs.
9c, control can be achieved by simply inserting one set of Zyristor circuit breaker 43, diode bridge circuit 41, and diode series circuit 30. There is an advantage to being able to omit the set. This allows the power supply device to be manufactured at low cost. Also, when controlling the regenerative current generated in each electric train line 9a, 9b, and 9c, the Zyristor circuit breaker 43, the diode bridge circuit 41, and the GUIO 1 series circuit 30.
60/: Since it can be controlled at all times, there is an advantage that a regenerative circuit breaker is not required.

Furthermore, the horn current and regeneration? Since both the 111 currents pass through the Zyristor circuit breaker 43, by opening the circuit breaker 43, both the power running and regeneration currents can be interrupted by one set of Zyristor circuit breakers 43, which simplifies the protection failure. can be converted into By using the Zyristor circuit breaker which has the function of interrupting both the power running and regenerative currents in this way, it is possible to use the Zyristor circuit breaker shown in FIG. When a ground fault occurs at point F1 of the Ii lane 9a, the power running current is interrupted by opening the Zyristor circuit breaker 43. After that, the DC disconnector 8
If a is opened and the Zyristor circuit breaker 43 is closed again, the regenerative current 12 is operated on the 271st train line 9b and the regenerative current is supplied to the 1; uni third electric train line 9C. be done.

In the two-legged embodiment, if a ground fault or 1f fault occurs at the F2 point of the power running line 3, the Zyristor circuit breaker 43 is shut off. Second. Third? I! Lanes 9a, 9
b.

The regenerative current generated in 9c is transferred to DC disconnectors 8a, 8b, 8c.
m diodes 42a, 42c, 31 → fault point F2 through the path of Zyristor cutoff 43- and diode 62
Prevent it from flowing into. Also, at this time, it is possible to prevent the extended power supply current flowing from the adjacent substation from flowing into the fault point F through the same path as described above. This can prevent the power outage from spreading to the reservoir area. Further, since only one set of Zyristor circuit breakers 43 is required for one or three electric train lines, there is an advantage that the circuit breaker control device and its handling are simplified.

G7. Embodiment of the Second Invention Next, an embodiment of the second invention will be explained with reference to FIGS. 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 42b, 42d, and 32 are used.
The anode side common connection point 45 of is connected to the regeneration bus 29. A reverse power converter 2 that converts DC power into AC power is connected to the regeneration bus 29. In FIG. 2, the forward power converter I may be a Zyristor rectifier.

In the above embodiment, the operation during corner driving and at the time of an accident is the same as that of the circuit shown in FIG. 1, so a description thereof will be omitted. Regeneration that occurred on the 271i lane 9b? U current is DC disconnection a
: +8b-・Diode 42c → Zyristor circuit breaker 43
- Diode 4211 - the first via the DC disconnector 8a
It is supplied to the electric train line 9a or the DC disconnector 8b
- Diode 142c - Zyristor circuit breaker 43 - Diode 32 - 37th [i lane 9c via DC disconnector 8C]
Alternatively, it is regenerated to a commercial frequency power source (not shown) via the DC disconnector 8b, the diode 112C, the thyristor circuit breaker 43, the regeneration bus 29, and the reverse power converter 2. In addition, 1st. Third train track 9a.

The regenerative current generated in the diode bridge circuit 41.9c is similar to the above. Diode series circuit 30.60. It flows through the Zyristor circuit breaker 43 and is either supplied to each overhead contact line or regenerated to the inverse power converter 2.

Further, in the above embodiment, if a ground fault occurs at 13 points of the regeneration bus bar 29, if the Zyristor cutoff 2<43 is cut off, the first. Second. Third train track 9a, 9b
, 9c, the regenerative current generated is connected to the DC disconnector 8a.

8b, 8C→diodes 42a, 42c, 31→Zyristor circuit breaker 43 can be prevented from flowing into the fault point F3. Further, at this time, it is possible to prevent current flowing from an 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 62 is connected between the power running bus 3 and the regeneration bus 29 in accordance with the illustrated polarity, so even if the reverse power converter 2 fails to commutate, the diode 62 Can you prevent accidental 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.

G1. Embodiment of the third invention Next, an actual example of the third invention will be explained in Fig. 3 and B.)°
reactor. In Fig. 3, the same parts as in Fig. 2 are denoted by the same symbols [l
It is denoted by f, and its explanation can be omitted.

The parts in FIG. 3 that differ from FIG. 2 are the cathode side of the Cyrisk circuit breaker 43 and the diode 421+.

Common connection point 45 on the anode side of 42d and diode 62
A stopper diode 68 with the polarity shown is connected between the anode and the anode of
, and instead of the reverse power converter 2, a bidirectional power converter 1534 that converts DC power to AC power or AC power to DC power is connected, and the other parts are the same. (1 is true.

In FIG. 3, the forward power converter I may be a Zyristor rectifier.

Next, describe the operation of the above embodiment.

The powering current of the single electric horn converter l flows in the same manner as in the cases of FIGS. 1 and 2.

In addition, the regenerative current generated in the 2711th lane 9b is transferred from the DC disconnector 8b to the diode to the 142cm Sairisk circuit breaker 43.
- the diodes 42b, 32 - the first through the DC disconnectors 8a, 8c. The 37th [1] is supplied to the city lines 9a and 9c, or is supplied to a commercial power supply (not shown) via the DC disconnector 8b → diode 42c → Cyrisk circuit breaker 43 - stopper diode 68 → regeneration bus 29 - bidirectional power converter 34. It is regenerated to the frequency power supply side. In addition, 1st. 3rd train track 9
The regenerative currents generated in the diode bridge circuits 41.a and 9c are similar to those described above. Cyrisk circuit breaker 43. It is supplied to each electric train line via the diode series circuit 30 and the stopper diode 68, or is regenerated to the bidirectional horn converter 34. In addition, since the diode 62 is inserted between the power running bus 3 and the regeneration bus 29, even if the bidirectional power converter 34 fails to commutate during reverse power conversion operation, the diode 62 performs bidirectional power conversion. It is possible to prevent fault current from flowing into the device 34 side. Thereby, it is possible to prevent the expansion of accident B due to commutation failure during the reverse power conversion operation of the bidirectional power converter 34.

”The first one is like two legs. Second. No. 37 [lane 9a, 9
b.

When supplying the power running Ii current to 9c, control can be performed using only one set of the SIRISK circuit breaker 43, the diode bridge circuit 41, and the diode series circuit 30, 60, so two sets of SIRISC circuit breakers 43 can be omitted compared to the conventional one. There are advantages. This allows the entire power supply device to be manufactured at low cost. Also, 1st. Second. 3rd train track 9a, 9b, 9
When controlling the regenerative current generated in c, the same advantages as described above can be obtained because the regenerative current can be controlled using only the circuit breaker 43, the diode series circuit 30, the diode bridge circuit 41, and the stopper gates 1 and 68.

Furthermore, power running 11! Since both current and regenerative current pass through the thyristor circuit breaker 43, if the thyristor circuit breaker 43 is opened, both currents for power running and regeneration can be interrupted by one zyristor circuit breaker λ (43). For example, by using a Cyrisk circuit breaker that has the function of interrupting both power running and regenerative currents, it is possible to
When a ground fault occurs at point F1 of
If it is closed, there will be no problem in the operation of the horn bound electric cars 12 running under the second and third tram tracks 9b and 9c.

- In the embodiment described in , the ground i is at point F7 of the power running bus 3.
If an accident occurs, if the risk circuit breaker 43 is shut off, the first. Second. 37th Ti laneway 9a, 9b.

The regenerative current generated at 9C is connected to the DC disconnectors 8a, 8b, 8c.
Through the path of m diodes 42a, 42c, 31-silisk circuit breaker 43→stopper diode 68-diode 62, "1" is prevented from flowing into fault point F2. This prevents the flow extension power supply current from flowing into the fault point F through the same path as described above.Furthermore, if a ground fault occurs at point 125 of the regeneration bus 29, the cyrisk circuit breaker 43 is cut off. For example, the first, second and third electric train tracks 9a, 9b.

The regenerative current generated in 9c is connected to DC disconnectors 8a, 8b,
8c→diodes 42a, 42c, 31→Zyristor circuit breaker 43→stopper diode 68 from flowing into the fault point F. Further, at this time, it is possible to prevent the current flowing from the adjacent substation from flowing into the fault points 1 to 3 through the same path as described above. Therefore, it is possible to prevent the power outage from spreading to other transformer stations.

Further, since the Zyristor circuit breaker I3 can be used for three electric train lines with Ifl/J, there is an advantage that the circuit breaker control device and its handling are simplified.

Here, the bidirectional power converter 34 is operated in a similar manner to U.
In this case, the powering current flowing from the converter 34 flows through the following path. That is, bidirectional power converter 34 → diode 62.61 → Zyristor circuit breaker 43 → diode 42b
, 42d, 32--DC disconnector 8a, 8b, 8
1st through c. Second. 3rd train track 9a, 9b,
9c. By causing the bidirectional power converter 34 to operate as a type force converter and supply power running current, the capacity of the type horn converter l can be reduced, and in the event of a failure, it is possible to Powering current can be supplied without causing a power outage. In addition, since the stopper diode 68 of the illustrated polarity is connected between the cathode side common connection point 45 of the Cyrisk circuit breaker 43 and the regeneration bus bar 29, the power running current supplied from the bidirectional power converter 34 is connected to the Cyrisk circuit breaker 43. 43
It is possible to prevent the current from flowing directly to the diode bridge circuit 41 without passing through it.

In the second invention, the diode 62 may be deleted and the power running bus 3 and the regeneration bus 29 may be separated.

[I Effects of the Invention] 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 two sets of power running Zyristor circuit breakers, so equipment costs are significantly reduced.
It will be published. In addition, one set of circuit breakers can interrupt power running 1 current 9 regenerative currents, fault currents, and extended power supply 'fII currents from adjacent substations, greatly simplifying the equipment and simplifying the protection sequence. This improves reliability.

b. Because a diode was inserted between the power running bus and the regeneration bus, accidents caused by the Class 7U power converter flowing into the Mu reverse power converter or bidirectional power converter side when commutation fails during reverse power conversion operation. Since the current can be blocked by a diode, it is possible to prevent an accident from occurring in a reverse power converter or a bidirectional 1U power converter from expanding.

C9 Suppose that a ground fault occurs on one of the tram lines, open the DC disconnector that supplies that line after opening the breaker, and then close the breaker, and there will be a regenerative electric car on the other tram line. For example, regeneration of the regeneration 71 style is possible.

d. If you open the circuit breaker in the event of an accident on the train track side or a DC bus (for power running 1 regeneration) accident, you can prevent the accident from spreading.1! - This has the advantage of significantly improving system reliability.

e. If a ground fault occurs during extended power supply, the extended power supply current will be cut off by the circuit breaker connected to the fault line, so extended power supply 1! Adjacent change 1t that supplies current! There is no need to block it anywhere. Therefore, it is essential to further simplify the protection sequence and minimize the impact of accidents.

r. Since the 71 currents flowing on the three overhead contact lines can be interrupted by the same circuit breaker, there is no potential difference between the sections. Therefore, the inter-section potential difference hli 'Z
There is no need to do l. Also, is electric car number ＋? ti The current capacity of the circuit breaker is limited because the train runs from the tram line to the second tram track, or from the second tram track to the first tram track. ↑1 does not necessarily require the capacity of three train lines.

g. When using a GTO (gate turn-off thyristor) circuit breaker as a circuit breaker, if the regenerative current is interrupted by the regenerative circuit breaker 6 in a conventional device, for example the circuit shown in Figure 4, the power running circuit breaker 1
A reverse bias voltage is applied to 4a, 4b, and 4c (G'l'0). Generally, G i' O has a self-extinguishing function, so it is not used to apply a reverse bias voltage. Therefore, in order to use GTO as a circuit breaker in the circuit shown in Fig. 4, the reverse 7u voltage resistance L of the G 'I' O element is required.
i1 must be increased, resulting in an expensive device, which is economically disadvantageous. On the other hand, when G'rO is used as the circuit breaker in the circuit of the present invention, the reverse voltage applied from the power running month 1 bus 3 is applied to the diode 62° and the stopper diode 68.
blocked by 71i lanes 9a, 9b, 9c
The reverse voltage applied from the diodes 42b, 42d,
32. Therefore, the circuit breaker (G'I
Since no reverse voltage is applied to the circuit breaker using G i' O, a general G i' O can be used. This makes it possible to manufacture an inexpensive device, making Yf publication extremely economical.

[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 showing a conventional example. 1...Forward power converter, 2...Reverse power converter, 3...
・1τ1 wire for power running, 29 Bus bar for regeneration, 8a, 8b
, 8c...DC disconnector, 9a, 9b, 9cm・
・Train track, ILa, 1lb=-dead section,
4-diode bridge circuit, 43...Thyristor circuit breaker, 30.80...Diode series circuit, 34.Bidirectional 7H force converter, 68...Stopper diode. Fig. 1. Harm measurement of Komei (1i! 5 Σ indicator each 21-・F@Power case grinder 3・-Tsukuda 1jI1 8a, 8b, 8cm-aZkKIA 9a, 9b, 9cm-One train Smoke road No., Hb---Dage F section +2-1% car 41-11 Riiordofu"Shoji Dosho 43...-
Thyristor 1 Disconnector 30.60 - 11 Diode series circuit Figure 2 Figure 2 Large fragile IJ Otsuho 1 Great leap each closed 1 -) 1 Power f- converter, 3 - Power running fE o Izumi 8a, 8b, 8cm--J style [tffi! 9a, 9b,
9cm electric! , railroad track + IC1, 11b--di-sodosekyung-yong 12--electric car 41--thai autopa) lip box each 43°"-1
457911 single unit 30.60-11 tapaiode direct J11 times father-in-law 29...
- Regeneration bus wire + So et + + Lu circle Figure 3 Circuit diagram showing Komei tributary A row 8 + - JQ capital power barley) Mulberry 3 - Sword C mouth 1 bundle 8a, 8b, 8cm - -11i7t*Rm9a, 9b,
9cm-Electric IM path Naj+b--Putto 12--Electric car 29-Regeneration main spring 34--Two-way power support 41--Diode block circuit 43-Thyristor 1 disconnector

Claims (3)

[Claims] (1) A diode bridge circuit formed by bridge-connecting diodes, and the cathodes and anodes of the diodes constituting each side of this diode bridge circuit are separately connected to a common connection point and separated by dead sections. a first diode series circuit connected between the commonly connected anode side and cathode side of the diode bridge circuit, and a common connection point of the first diode series circuit; and a third overhead contact line provided between the first and second overhead contact lines separated from both lines by a dead section, and between the commonly connected anode side and cathode side of the diode bridge circuit. A circuit breaker to be connected, a second diode series circuit connected in parallel to this circuit breaker, a power running bus bar connected to a common connection point of this second diode series circuit, and a power running bus bar connected to this power running bus bar. , a forward power converter that converts alternating current power into direct current power. (2) A diode bridge circuit formed by bridge-connecting diodes, and the cathodes and anodes of the diodes constituting each side of this diode bridge circuit are separately connected to a common connection point and separated by dead sections. a first diode series circuit connected between the commonly connected anode side and cathode side of the diode bridge circuit, and a common connection point of the first diode series circuit; and a third overhead contact line provided between the first and second overhead contact lines separated from both lines by a dead section, and between the commonly connected anode side and cathode side of the diode bridge circuit. A circuit breaker to be connected, a second diode series circuit connected in parallel to this circuit breaker, a power running bus bar connected to a common connection point of this second diode series circuit, and a power running bus bar connected to this power running bus bar. , a forward power converter that converts AC power into DC power; a regeneration bus bar connected to the commonly connected anode side of the diode bridge circuit; and a regeneration bus bar connected to the regeneration bus bar and converting DC power into AC power. What is claimed is: 1. A direct current power supply device comprising: a reverse power converter. (3) A diode bridge circuit formed by bridge-connecting diodes, and the cathodes and anodes of the diodes constituting each side of this diode bridge circuit are separately connected to a common connection point and separated by dead sections. a first diode series circuit connected between the commonly connected anode side and cathode side of the diode bridge circuit, and a common connection point of the first diode series circuit; and a third overhead contact line provided between the first and second overhead contact lines separated from both lines by a dead section, and between the commonly connected anode side and cathode side of the diode bridge circuit. a stopper diode whose anode is connected to the commonly connected anode side of the diode bridge circuit; and a stopper diode connected between the commonly connected cathode side of the diode bridge circuit and the cathode of the stopper diode. a second diode series circuit, a powering bus connected to a common connection point of the second diode series circuit, and a forward power converter connected to the powering bus and converting alternating current power into direct current power. and 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. Characteristic DC power supply device.