JPS62214029A - D.c. feeder - Google Patents

Abstract

PURPOSE:To ensure proper conducts at any accident on the power running bus-line, regenerative bus-line or the like for improving 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 two pairs of circuit breakers. 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 two pairs of thyristor breakers 23, 43, diode bridge circuits 21, 41 and diode series circuits 30, 50. Thus, the number of thyristor breakers can be reduced by two pairs in comparison with the conventional arrangement, allowing reduction of the arrangement cost. Furthermore, for example, when a ground 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 second electric overhead line 9b. In this case, the thyristors 43 are not required to be opened, with no influence of the ground accident on the third and fourth electric overhead lines 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 particularly relates to a power supply device for DC electric railways that converts AC power into DC power and supplies it as a drive source for electric cars. .

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. and a diode bridge circuit, and allow regenerative current to flow through the circuit breaker,
In addition, by configuring each buritsuno circuit to serve as a mutual reserve (power interchange), system reliability in the event of an accident on the contact line or a DC bus accident can be significantly improved, and regenerative current can also be effectively used. It has been made available for use.

C9 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, the electric line is generally divided into adjacent substations and by line, and the divided electric line is connected to each positive bus at each substation via a DC high-speed circuit breaker dedicated to each line. The rail is 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.

FIG. 7 shows a conventional power supply device, where l is a forward power converter consisting of a thyristor control element that converts AC power into DC power, and 2
is an inverse power converter consisting of a thyristor control element that converts DC power into AC power.

7 is a DC bus bar, 4a to 4d are powering circuit breakers (
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 thyristor 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, 10b 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. 7 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. A forward power converter l converts the divided first .
Second train track 9a.

9b 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 operated using DC power supplied as described above.Next, when the electric cars 13 are in regenerative operation, the regenerative power is transferred to the fourth overhead contact line 1. It is supplied from Ob to the DC bus 7 via the disconnector 8c, the regenerative diode 5C, 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.

D8 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 antiparallel via the DC bus 7, so that reverse power conversion is not possible. There is a problem that when commutation of converter 2 fails, a fault current is supplied from the forward power converter l side and the fault is magnified.

In addition, in the configuration shown in FIG. Power running circuit breakers 4a, 4b, 4c, 4d are used to supply DC power to the second, third and fourth contact lines 9a, 9b, LOa, 10b.
There is a problem in that power must be supplied through each separately, and four circuit breakers for power running are required. Furthermore, a regenerative circuit breaker 6 is used 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 side.
Is required. As a result, as many as five expensive cyrisk circuit breakers are required, which increases the size of the substation equipment. This resulted in problems such as increased equipment costs for substation construction. In addition to the above, power running circuit breakers 4a, 4b, 4c,
Since the regenerative circuit breaker 4d and the regenerative circuit breaker 6 have different properties and purposes, there is a problem that the control means (protection sequence) becomes extremely complicated.

E. Means for Solving the Problems This invention provides two sets of diode bridge circuits formed by bridge-connecting diodes, and a common connection between the cathodes and anodes of the diodes constituting each side of these two sets of diode bridge circuits. The first section is connected to each connecting point separately and is separated by a dead section forming a double track. 2nd and 3rd. a fourth overhead contact line, two sets of circuit breakers provided separately for the two sets of diode bridge circuits, and connected between the commonly connected cathode sides and anode sides of these bridge circuits; and these two sets of circuit breakers. two sets of diode series circuits connected in parallel to each other, and a DC disconnector inserted in an electric line connecting the cathode side common connection points of the two sets of diode bridge circuits and an electric line connecting the anode side common connection points, respectively. , a power running bus connected to each common connection point of the two sets of diode series circuits, a forward power converter connected to the power running bus and converting AC power into DC power, and the two sets of diode bridges. Two sets of stopper diodes each having an anode connected separately to the commonly connected anode side of the circuit and a common cathode connected to each other, and a regeneration unit connected to the commonly connected cathode side of the two sets of stopper diodes. It is characterized by comprising a regeneration bus and an inverse power converter that is connected to the regeneration bus and converts DC power into AC power.

F Effect When configured as described above, the first effect is as follows. 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 regeneration current can be controlled using two sets of circuit breakers, the device can be manufactured at extremely low cost, which is economically advantageous.

Furthermore, there is a mutual standby system in which the commonly connected anode sides and commonly connected cathodes of two sets of diode bridge circuits are connected by a DC disconnector to mutually accommodate power between the two sets of diode bridge circuits. Therefore, even if one circuit breaker fails, power can be supplied to the entire train line through the other circuit breaker.

G, Example G3. 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. 7 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 diodes 22a and 22b in this first diode bridge circuit 21 is connected to the first electric train line 9a via a DC disconnector 8a.

A common connection point 27 between the diodes 22c and 22d is connected to the second overhead contact line 9b via a DC disconnector 8b. A common connection point 46 between the diodes 42a and 42b is connected to the third overhead contact line 10a 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. Common connection point 24 on the cathode side of diodes 22a and 22c
is connected to the anode of a first cyrisk circuit breaker (this circuit breaker may be a DC high speed circuit breaker) 23.

The cathode of this cyrisk circuit breaker 23 is a diode 22
It is connected to the anode side common connection point 25 of J22d. The anode of a second SIRISC circuit breaker (this circuit breaker may be a DC high-speed circuit breaker) 48 is connected to a common connection point 44 on the cathode side of the diodes 42a, 42c.

The cathode of this thyristor breaker 43 is a diode 42
b, 42d are connected to the anode side common connection point 45. The thyristor circuit breaker 23 includes a diode series circuit 3 in which diodes 31 and 32 of the illustrated polarity are connected in series.
0 are connected in parallel. Sairisk circuit breaker 43
A diode series circuit 50 in which diodes 51 and 52 of the illustrated polarity are connected in series is connected in parallel. Common connection point 33 of diodes 31 and 32 and diode 5
A common connection point 53 between the power supply units 1 and 52 is commonly connected to the power running (DC) bus bar 7 .

A DC disconnector 81 is connected between the cathode common connection point 24 of the bridge circuit 21 and the cathode common connection point 44 of the bridge circuit 41. Further, a DC disconnector 82 is connected between the anode side common connection point 25 of the bridge circuit 21 and the anode side common connection point 45 of the bridge circuit 41. These DC disconnectors 81 and 82 are normally open, and are closed when either one of the above-mentioned cylindrical circuit breakers (23 or 43) fails.

Although the forward power converter 1 is a diode rectifier,
It may also be a thyrisk rectifier.

Next, the operation of the above embodiment will be described. Cyrisk circuit breaker 2a
, 43 are normally closed, the forward power converter 1
The powering current is from the powering bus 7 to the diodes 31 and 51 to the thyristor circuit breaker 23.43 to the diode 22b.

22d, 42b, 42d-Blue DC disconnector 8a, 8
b, 8c, '8d to the first to fourth electric train tracks 9a,
9b, 10a, and IOb, respectively.

4th train track 1. The regenerative current generated in Ob is passed through DC disconnector 8d-diode 42c-+Sirisk circuit breaker 4
3-diode 52-diode 31-Sirisk circuit breaker 23→diode 22b, 22(1→DC disconnector 8
a, 8b through the first. Supplied to the second overhead contact line 9a, 9b, DC disconnector 8d-diode-F'42cm
It is supplied to the third overhead contact line 10a via the thyristor circuit breaker 43, the diode 42b, and the DC disconnector 8C. First of all. Second. The regenerative current generated in the third electric train tracks 9a, 9b, ]Oa is also connected to the diode bridge circuit 21 in the same manner as described above.
．． 41. Thyristor circuit breaker 23.43. flows through the diode series circuit 30.50.

” - 1st to 4th tram tracks 9a, 9b, 1 as shown
0a.

1. When supplying power running current to Ob, two sets of Cyrisk circuit breakers 23.43 and diode bridge circuit 2+,
4] and Tie-auto series circuit 30.50 (because it can be controlled by
There is an advantage that the set can be omitted. This allows the entire power supply device to be manufactured at low cost. In addition, the first to fourth electric train tracks 9a,
9b, lOa, and IOb, the thyristor circuit breaker 23.43, the diode bridge circuit 21.41, and the diode series circuit 30.
Since it can be controlled with only 50, there is an advantage similar to that described in "-".

Furthermore, both the power running current and the regenerative current are connected to the thyristor circuit breaker 2.
Since it will pass through 3.43, it will pass through Cyrisk circuit breaker 23.
If 43 is opened, both currents for the first regeneration of power running can be interrupted by the two Cyrisk circuit breakers 23 and 43. By using this J: Uni power running and regeneration currents, the Cyrisk circuit breaker 23 is opened when a ground fault occurs at point F1 of the electric train track 9a in Fig. 1, for example. 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, there is no problem in the operation of the power running electric car (not shown) running under the second overhead contact line 9b. Furthermore, if a ground fault occurs at the F1 point of the overhead contact line 9a, the 3rd and 4th contact line 40a and IOb side side risk circuit breakers 43 do not need to be opened, so they are not affected by the above ground fault. . Furthermore, during extended power supply from an adjacent substation (that is, for example, when powering current is supplied from an adjacent substation to the fourth overhead contact line LOb, the following steps apply: - When only the desired end section (first and second contact lines 9a, 9b) is stopped by the end section (supplying power running current to the third contact line] and Oa via the DC disconnector 8C), Even if there is a third Zyristor circuit breaker, it only opens the first Zyristor circuit breaker 23. 4th train track 1.0
Extended power supply can be continued to the end sections on the a and 10b sides, allowing smooth operation of electric cars.

If an accident occurs during the extended power supply, the circuit is cut off by the SIRISK circuit breaker 23 or 43 connected to the fault line, so there is no need to cut it off at the adjacent substation that supplies the extended power supply current. Therefore, the protection sequence can be further simplified, the effects of accidents can be minimized, and the operating efficiency of electric vehicles can be improved.

In the above embodiment, if a ground fault occurs at point F2 of the power running bus 7, if the thyristor circuit breaker 23゜43 is shut off, the electric power lines 9a, 9b, IOa, IOb
The regenerative current generated in the DC disconnectors 8a, 3b, 8c
, 8d→diode 22a, 22c, 42a,
42C → Cyrisk circuit breaker 23.43 → Diode 32
．． It is possible to prevent the water from flowing into the accident point F2 through the route No. 52. Further, at this time, the extended power supply current flowing from the adjacent substation can be prevented from flowing into the fault point F2 through the same path as described above. Therefore, it is possible to prevent the power outage from spreading to other substations.

Here, if the DC disconnectors 81 and 82 are closed when the thyristor circuit breaker 23 fails, for example, the first DC disconnector 81 and 82 connected to the thyristor circuit breaker 23 can be closed. Second train tracks 9a, 9b
In addition, power can be supplied from the Cyrisk circuit breaker 43 side via the DC disconnector 82. This can improve the reliability of the system itself.

Furthermore, by closing both the DC disconnectors 81 and 82 when the thyristor circuit breaker 23 fails, not only the powering current of the forward power converter 1 but also the extended power supply current from the adjacent substation can be transferred to the first. The regenerative current generated on the second overhead contact line 9b can also be supplied to the first overhead contact line 9a. In other words, from the adjacent substation
．． 4th train track 1. The power supply current supplied to oa, ]Ob is from DC disconnectors 8c and 8d to diodes 42a and 42.
c → Zyristor circuit breaker 43 → DC disconnector 82 → diodes 22b, 22d → first via DC disconnectors 8a, 8b. It is supplied to the second electric train tracks 9a and 9b. In addition, the regenerative current generated on the second overhead contact line 9b is transferred to the DC disconnector 8.
b→diode 22c→DC disconnector 81→Zyristor circuit breaker 43-DC disconnector 82=diode 22b→DC disconnector 8a to be supplied to the first overhead contact line 9a.

Further, even if the thyristor circuit breaker 43 fails, each electric train line 9a, 9b, 10a, 1 is removed by the same operation as described above.
Power can be supplied to 0b.

In the embodiment described above, the end section of the overhead contact line forming a double track was divided into up and down lines, but the present invention can also be applied to a power supply device which is divided into directions, and this embodiment is shown in Fig. 2. Shown below. The difference in FIG. 2 from FIG. 1 is that a common connection point 26 between diodes 22a and 22b is connected to the third overhead contact line 10a via a DC disconnector 8a;
A common connection point 27 between diodes 2c and 22d is connected to the first electric line 9a via a DC disconnector 8b, and a common connection point 46 between diodes 42a and 42b is connected to the second electric line 9 via a DC disconnector 8c.
b, the common connection point 47 of the diodes 42c and 42d is respectively connected to the fourth overhead contact line 10b via the DC disconnector 8d, and the other parts are configured identically. In the circuit shown in Figure 2, the power running current is small once. The extended power supply current and the fault current flow through the two sets of thyristor circuit breakers 23, 43, which perform the same operation as the circuit shown in FIG. 1 and produce the same effects.

G2. Example of the second invention Next, an embodiment of the second invention will be described with reference to FIG.

In FIG. 3, the same parts as in FIG. 1 are shown with the same reference numerals, and the explanation thereof will be omitted. The difference in FIG. 3 from FIG. 1 is that the regenerative current can be regenerated to the reverse power converter 2 side, and the common connection point 25 on the anode L side of the diodes 22b and 22d and the diode 1; , 4
The anodes of the tube diodes 28 and 28 are individually connected to the common connection point 45 on the anode side of the transistors 2d. The cathodes of these stopper diodes 28, 48 are collectively 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. 3, the forward power converter 1 may be a Zyristor rectifier.

In the first 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 4th overhead contact line fob is as follows: DC disconnector 8d - diode 42c - Zyristor breaker 43 - diode 52 → diode 31 → Xyristor circuit breaker 23 =
Diodes 22b, 22d-DC disconnectors 8a, 8b
via the 1st. It is supplied to the second overhead contact line 9a, 9b, or it is supplied to the third overhead contact line 10a via DC disconnector 8d → diode 42C = Zyristor circuit breaker 43 - diode 42b - DC disconnector 8C, or DC disconnector The power is regenerated to the commercial frequency power source (not shown) via the device 8d, the diode 42c, the Zyristor circuit breaker 43, the stopper diode 48, the regeneration bus 29, and the inverse power converter 2. Note that the regenerative current generated in the first to third overhead contact lines 9a, 9b, ] and Oa is also connected to the diode bridge circuit 2] as described above.
, 4+, Zyristor circuit breaker 23.43. It flows through the stopper diodes 28, 48 and is either supplied to the respective overhead contact line or regenerated to the reverse power converter 2.

In addition, in the above embodiment, F327 of the regeneration bus bar 29
If a ground fault occurs at one point, the Zyristor circuit breaker 23
．． 43, the first. Second. Third. The regenerative current generated on the fourth overhead contact lines 9a, 9b, 10a, 10b is transferred to the DC disconnectors 8a, 8b, 8c, 8d and the diodes 22a, 22c.

42a, 42c→Zyristor circuit breaker 23.43→stopper diode 28.48, it can be prevented from flowing into fault point F3. Also, at this time, the current flowing from the adjacent substation passes through the same path as above to the fault point F.
3 can be prevented from flowing in. Therefore, it is possible to prevent the power outage from spreading to other substations.

Furthermore, in the first embodiment, the power running bus 7 and the regeneration bus 29
Since diodes 32 and 52 are connected between them according to the polarity shown, even if the reverse power converter 2 fails in commutation,
The diodes 32 and 52 can prevent fault current from flowing into the reverse power converter 2 side.

Thereby, even if there is a commutation failure in the reverse power converter 2, it is possible to prevent the accident from expanding.

In the embodiment described above, the end section of the overhead contact line forming a double track was divided into up and down lines, but the present invention can also be applied to a power feeding device that is divided into directions, and this embodiment will be described in the following. Shown in Figure 4. The difference between FIG. 4 and FIG. 3 is that a common connection point 26 between diodes 22a and 22b is connected to the third electric line 10a via a DC disconnector 8a, and a common connection point 27 between diodes 22c and 22d is connected to a DC disconnector 8b. A common connection point 46 between diodes 42a and 42b is connected to the second electric line 9b via a DC disconnector 8c, and a common connection point 47 between diodes 42c and 42d is connected to the first electric line 9a via a DC disconnector 8d. and are respectively connected to the fourth electric train line TAB, and the other parts are configured exactly the same. In the circuit shown in Figure 4 as well, the power running current 1 regeneration current, extended power supply current, and fault current flow through the two sets of Cyrisk circuit breakers 23.43, and the circuit operates in the same way as the circuit shown in Figure 3. It also has the same effect.

G3. Example of third invention Next, an embodiment of the third invention will be described with reference to FIG.

In FIG. 5, the same parts as in FIG. 3 are shown with the same reference numerals, and the explanation thereof will be omitted. The difference in FIG. 5 from FIG. 3 is that the diode 3 of the diode series circuit 30.50
2.52 anodes are put together and test tube diode 28
．． 48, and the regeneration bus 29 is equipped with a bidirectional power converter 34 that converts DC power into AC power or AC power into DC power instead of the reverse power converter 2. are connected, and the other parts have the same configuration.

Incidentally, in FIG. 5, the forward power converter 1 may be a Sirisk rectifier.

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

When the Cyrisk circuit breaker 23.43 is normally closed, the power running current of the forward power converter 1 is as follows: power running bus 7° - diode 31.51 - Cyrisk circuit breaker 23.43 → diodes 22b, 22d, 42b, 42d → DC disconnector 8a.

The first to fourth electric train tracks 9a via 8b, 8c, and 8d
, 9b.

1 [1a, 10b, respectively.

The regenerative current generated in the 4th overhead contact line LOb is transferred from DC disconnector 8d to diode 42c to Cyrisk circuit breaker 43 to stopper diode 48 to diode 52 to diode 31.
→Sirisk circuit breaker 23 →diode 22 b, 22d
The first. It is supplied to the second overhead contact lines 9a and 9b, or the DC disconnector 8d → diode 42c → thyristor breaker 43 → diode 42b
→It is supplied to the third overhead contact line 10a via the DC disconnector 8C, or the DC disconnector 8d-diode 42G-
) The power is regenerated to the commercial frequency power supply side (not shown) via the cyrisk circuit breaker 43 → stopper diode 48 → regeneration bus 29 → bidirectional power converter 34. First of all. The regenerative currents generated in the second and third overhead contact lines 9a, 9b, 10a are also connected to the diode bridge circuits 21, 41. Cyrisk circuit breaker 23.43. It flows through the stopper diode 28.48° diode series circuit 30.50. Also,
Diode 32.52 connects power running bus 7 and regeneration bus 29
Since the bidirectional power converter 34 is inserted between the guides 32 and 32, even if the bidirectional power converter 34 fails in commutation during reverse power conversion operation,
52 causes an accident to occur on the bidirectional power converter 34 side.

It can prevent the flow from flowing in. Thereby, even if there is a commutation failure during the reverse power conversion operation of the bidirectional power converter 34, the expansion of the accident can be prevented.

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

When powering current is supplied to 10b, two sets of thyristor circuit breakers 23.43, a diode bridge circuit 21.41, and a diode series circuit 3o, 50 can be used for control. It has the advantage of being omissible. This allows the entire power supply device to be manufactured at low cost. In addition, the first to fourth electric train tracks 9a, 9b,
When controlling the regenerative current generated in 10a and 10b, the same advantage as described above can be obtained because control can be performed using only the SIRISK circuit breaker 23.43, the diode bridge circuit 21.41, and the stopper diode 28.48.

Furthermore, since both the power running current and the regenerative current pass through the Xyristor 1"h disconnector 23.43, the Xyristor 1"h disconnector 23.43
3.If you open 43, you can cut off both currents for power running in 1st regeneration.
This can be done with one Cyrisk circuit breaker 23.43.

In this way, the A
By using such a cyrisk circuit breaker, for example, the fifth
When a ground fault occurs at point F on the tram track 9a in the figure,
When the SIRISK circuit breaker 23 is opened, the power running current is cut off. After that, if the DC disconnector 8a is opened and the SIRISK circuit breaker 23 is closed, there is no problem in the operation of the power running electric car running under the second overhead contact line 10b.

In the above embodiment, if a ground fault occurs at point F7 of the power running bus 7, if the Cyrisk circuit breaker 23゜43 is shut off, the contact lines FA9a, 9b, IOa, IO
The regenerative current generated in b is connected to DC disconnectors 8a, 8b, 8
c, 8d- diode 22a, 22c, 42a,
42C→Zyristor circuit breaker 23.43−→stopper diode 28.48−=−diode− It is possible to prevent the flowing extended power supply current from flowing into the fault point F through the same path as described above.Furthermore, if a ground fault occurs at the F3 point of the regeneration bus 29, the cyrisk circuit breaker 23.43 can be cut off. For example, train track 9a.

9b, ]Oa, the regenerative current generated in 10b is connected to the DC disconnector 8a.

8b, 8c, 8d → diode 22a, 22c,
42a, 42cm> Sairisk circuit breaker 23.43-
→It is possible to prevent the water from flowing into the accident point F3 through the path of the stopper diode 28°48. 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 Cyrisk circuit breaker is required for every two 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 and diode 3
2,52 → Diode 31.51 → Zyristor circuit breaker 2
3.43 → Diode 22b, 22d, 42b, 4
2d--The first through the DC disconnectors 8a, 8b, 8c, and 8d. 2nd゜3rd. 4th train track 9a, 9b, 1
0a and 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 weight of the main power converter 1, and also to prevent power outage at the substation in the event of a failure thereof. Powering current can be supplied without any trouble. In addition, since a stopper diode 28.48 with the illustrated polarity is connected between the cathode side common connection point 25.45 of the Cyrisk circuit breaker 23.43 and the regeneration bus bar 29, the power is supplied from the bidirectional power converter 34. It is possible to prevent the power running current from flowing directly to the diode bridge circuit 21.41 without passing through the SI risk circuit breaker 23.43.

In the above embodiment, the diodes 32 and 52 of the same polarity are connected in parallel between the horn row bus 7 and the regeneration bus 29, so these diodes 32 and 52 are connected in parallel as shown in the figure. A commonly connected diode may be used instead.

Here, if the DC disconnectors 81 and 82 are closed when, for example, the Zyristor circuit breaker 23 fails, the first one connected to the Zyristor circuit breaker 23 can be closed. Second tram tracks 9a, 9b
In addition, power can be supplied from the Zyristor circuit breaker 43 side via the DC disconnector 82. This can improve the reliability of the system itself.

Furthermore, by closing both the DC disconnectors 81 and 82 when the Zyristor circuit breaker 23 fails, not only the powering current of the forward power converter 1 but also the extended power supply current from the adjacent substation can be transferred to the first. Not only can the regenerative current generated on the second overhead contact line 9b be supplied to the second overhead contact line 9a, 9b, but also the regenerative current generated on the second overhead contact line 9b can be supplied to the second overhead contact line 9a, 9b.
It can be supplied to the train track 9a. In other words, the third substation from the adjacent substation. 4th overhead contact line] The power supply current supplied to Oa, 10b is DC disconnector 8c, 8d - diode 42a, 4
2c -> Zyristor circuit breaker 43 -> DC disconnector 82 - diode 22b, 22d - 1st current via DC disconnector 8a, 8b. It is supplied to the second electric train tracks 9a and 9b.

In addition, the regenerative current generated in the second overhead contact line 9b is transferred to the first overhead contact line via the DC disconnector 8b, the diode 22c, the DC disconnector 81, the Zyristor circuit breaker 43, the DC disconnector 82, the Gouio F22b, and the DC disconnector 8a. 9a.

Furthermore, even if the Zyristor circuit breaker 43 fails, each electric train line 9a, 9b, IOa, ] is operated in the same manner as described above.
Power can be supplied to Ob.

In the first embodiment, the end section of the overhead contact line forming a double track was divided into two underline sections, but the present invention can also be applied to a power supply device that is divided according to direction, and this embodiment will be described below. It is shown in FIG. The difference in FIG. 6 from FIG. 5 is that a common connection point 26 between diodes 22a and 22b is connected to the third electric line 10a via a DC disconnector 8a, and a common connection point 27 between diodes 22c and 22d is connected to a DC disconnector 8b. diodes 42a and 42b to the first electric train line 9a via
The common connection point 46 of the diodes 42c and 42d is connected to the second electric line 9h via the DC disconnector 8c, and the common connection point 47 of the diodes 42c and 42d
are respectively connected to the fourth overhead contact line] and Ob via the DC disconnector 8d, and the other parts are configured in exactly the same way. In the circuit shown in Fig. 6, the power running current 1
The regenerative current, extended power supply current, and fault current will flow through the two sets of Zyristor circuit breakers 23.43,
This circuit operates in the same way as the circuit shown in FIG. 5 and produces the same effects.

H1 Effects of the invention As described above, according to this invention, the following effects can be obtained.

=40- a. Even if only a desired end section is stopped during extended power supply, extended power supply can be continued to the end section on the other side of the electric train line, allowing smooth operation of electric cars.

b. 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 influence of accidents can be minimized, and the operating efficiency of electric vehicles can be improved.

Since a C0 stopper diode is installed, even if a ground fault occurs on one side of the train line, if the fault side of the two sets of circuit breakers is tripped, the fault current will flow from the other circuit breaker. Accidents can be prevented from spreading without any inflow of information.

d. 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.

e. Compared to the conventional example, there is no need for a regenerative circuit breaker and two sets of power running circuit breakers, so equipment costs are very advantageous. Also, since the number of circuit breakers is reduced, the protection sequence is simplified and reliability is improved.

In addition, one set of circuit breakers can cut off power running current, single regeneration current, fault current, and extended power supply current from adjacent substations, which greatly simplifies the equipment and simplifies the protection sequence, increasing reliability. will improve.

f Since power running power can be supplied by the forward power converter operation of the bidirectional power converter, the power capacity of the forward power converter can be reduced, and even if the forward power converter fails, power running power can be supplied, making it possible to reduce the need for substations. No power outages.

g. Even if a ground fault occurs on one tramway, if the DC disconnector supplying that line is opened after the circuit breaker is opened, and then the circuit breaker is closed, a regenerative electric car can be installed on the other tramway. Even if there is, the regenerative current can be regenerated.

h.If the circuit breaker is opened in the event of an accident on the train track side or an accident on the DC bus (for power running 1 regeneration), it will be possible to prevent the accident from spreading, significantly increasing the reliability of the system. There are advantages to improving.

1. Even if one of the two sets of circuit breakers fails, a mutual backup system is used, so that the line connected to the faulty circuit breaker can be connected to the other circuit breaker. Power can be supplied through a DC disconnector, improving the reliability of the system itself.

5. Since the current flowing in the two overhead contact lines can be interrupted by the same circuit breaker, there is no potential difference between the sections. Therefore, there is no need to compensate for potential differences between sections. Also, the electric car runs from the first tram track to the second tram track, from the second tram track to the first tram track, from the third tram track to the fourth tram track, or from the fourth tram track to the third tram track. Therefore, the current capacity of the circuit breaker does not necessarily require the capacity of two electric train lines. ”, GTO (gate turn-off risk) is applied to the 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. 7, the reverse voltage withstand capability of the GTO element must be increased by +3, making the device expensive and 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 applied to the diodes 32, 52, . Blocked by stopper diodes 28.48, the electric train tracks 9a, 9b, 10a, 10b
The reverse voltage applied from the diodes 22b, 22d,
42b, 42d. Therefore, since no reverse voltage is applied to the circuit breaker (circuit breaker using GTO), 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 another embodiment of the first invention, and FIG. 3 is a circuit diagram showing an embodiment of the second invention. 4 is a circuit diagram showing another embodiment of the second invention, FIG. 5 is a circuit diagram showing an embodiment of the third invention, and FIG. 6 is a circuit diagram showing another embodiment of the third invention. FIG. 7 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 line, 21.41...Diode bridge circuit,
23.43... Zyristor circuit breaker, 30.50... Diode series circuit, 28.48... Stopper diode, 29... Regeneration bus bar, 34... Bidirectional power converter, 81.82...・DC disconnector.

Claims (3)

[Claims] (1) Two sets of diode bridge circuits formed by bridge-connecting diodes, and the cathodes and anodes of the diodes constituting each side of these two sets of diode bridge circuits are individually connected to a common connection point. the first, second, third and fourth electric train tracks separated by dead sections forming a double track; and separately provided in the two sets of diode bridge circuits;
two sets of circuit breakers connected between commonly connected cathode sides and anode sides of these bridge circuits; two sets of diode series circuits each connected in parallel to these two sets of circuit breakers; and the two sets of diodes. DC disconnectors inserted in the electric circuit connecting the cathode side common connection points of the bridge circuit and the electric path connecting the anode side common connection points, respectively; and a power running circuit connected to each common connection point of the two sets of diode series circuits. A DC power supply device comprising: a busbar; and a forward power converter connected to the power running busbar and converting alternating current power into direct current power. (2) Two sets of diode bridge circuits formed by bridge-connecting diodes, and the cathodes and anodes of the diodes forming each side of these two sets of diode bridge circuits are separately connected to a common connection point. the first, second, third and fourth electric train tracks separated by dead sections forming a double track; and separately provided in the two sets of diode bridge circuits;
two sets of circuit breakers connected between commonly connected cathode sides and anode sides of these bridge circuits; two sets of diode series circuits each connected in parallel to these two sets of circuit breakers; and the two sets of diodes. DC disconnectors inserted in the electric circuit connecting the cathode side common connection points of the bridge circuit and the electric path connecting the anode side common connection points, respectively; and a power running circuit connected to each common connection point of the two sets of diode series circuits. A bus bar, a forward power converter connected to this powering bus bar and converting alternating current power into direct current power, and each anode connected separately to the commonly connected anode side of the two sets of diode bridge circuits, and two sets of stopper diodes whose cathodes are commonly connected; a regeneration bus bar connected to the commonly connected cathode sides of the two sets of stopper diodes; and a regeneration bus bar connected to the regeneration bus bar to convert DC power into AC power. What is claimed is: 1. A direct current power supply device comprising: a reverse power converter. (3) Two sets of diode bridge circuits made up of bridge-connected diodes, and the cathodes and anodes of the diodes forming each side of these two sets of diode bridge circuits are separately connected to a common connection point. the first, second, third and fourth electric train tracks separated by dead sections forming a double track; and separately provided in the two sets of diode bridge circuits;
Two sets of breakers are connected between the commonly connected cathode side and anode side of these bridge circuits, and each anode is separately connected to the commonly connected anode side of the two sets of diode bridge circuits. two sets of stopper diodes whose cathodes are connected in common, and a diode series connected between the commonly connected cathode sides of these two sets of stopper diodes and the commonly connected cathode sides of the two sets of diode bridge circuits. a DC disconnector inserted into a circuit connecting the cathode-side common connection points of the two sets of diode bridge circuits and an electric path connecting the anode-side common connection points of the two sets of diode bridge circuits; and a DC disconnector connected to the common connection point of the diode series circuits. a forward power converter that is connected to the power running bus and converts AC power into DC power; and a regeneration bus that is connected to the commonly connected cathode side of the two sets of stopper diodes. A DC power supply device comprising: a bidirectional power converter that is connected to the regeneration bus and converts DC power into AC power or AC power into DC power.