JPS62225434A - D.c. power supply device - Google Patents

Abstract

PURPOSE:To enhance the reliability upon a failure on the trolley line side or the D.C. bus side, by providing such an arrangement that both power running current and recovery current flow one and the same breaker while section-over is prevented upon grounding accident in the trolley line side so that two diode bridge circuits are used as standby systems for each other. CONSTITUTION:Breakers 23, 43, 53 are provided in a circuit for supplying D.C. power to trolley lines 9a through 9f so that power running current and recovery current may be controlled. Further, it is possible to cope with a failure in a power running current bus and recovery current bus by cutting off the breakers. Further, since the breaker 53 is connected to trolley lines 9c, 9f which are sectioned by a double section, when any grounding accident occurs in the trolley lines 9a, 9b, 9c, 9e, a section-over phenomenon may be prevented if the breaker 53 is opened together with a breaker in the failure line. Further, two sets of diode bridge circuits 21, 41 are used as standby systems for each other by disposing D.C. breakers 81, 82. Accordingly, even if one of the breakers fails, power may be fed through the other breakers.

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.

B9 Summary of the invention This invention is divided into double sections to form a double track 4°
In a power supply device for a DC electric railway equipped with a filter line, the circuit breaker is combined with a diode bridge circuit so that the current during power running and the current during regeneration flow through the same circuit breaker. It is configured to allow regenerative current to flow through the tramway and to prevent section over phenomenon even if the electric car is moving in the wrong direction in the event of a ground fault on the tramway.Furthermore, two diode bridge circuits provide a mutual reserve (71i power). By configuring the system so that it is flexible, the reliability of the system in the event of an accident on the contact line side or a DC bus fault can be significantly improved. It is designed so that it can be used effectively.

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, 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, there is a substation adjacent to the classified electric line;
It is configured as a power supply circuit that supplies power to 112 columns.

Figure 4 shows an example of a conventional power supply device, where l is a forward power converter consisting of a Zyristor control element that converts AC Tu force into DC power, and 2 is a forward power converter consisting of a Zyristor control element that converts DC power into AC power. It is a power converter. 3 is a DC bus, 4a, 4b, 4c, 4d, 4e.

4" is a Zyristor circuit breaker for power running (hereinafter referred to as a circuit breaker for power running), 5a, 5b, 5c, 5d, 5e, 5"
is a regeneration diode. These diodes 5a,
5J 5c, 5d.

The anode side of 5e, 5r is a power running cutoff 2g4a, 4
b, 4c.

4d, 4c, and 4r, and are connected to the cathodes of diodes 5a, 5b, 5c, 5d, 5e,
The cathode 1 of 5r is connected together and 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 DC bus 3. A reverse power converter 2 is connected to the DC bus 3 .

8a, 8b, 8c, 8d, 8e, IH is a DC disconnector, 9a, 9b.

9c, 9d, 9e, 9r are dead sections ll
a, 11b, llc.

This is an up and down train track divided by lids.

The power supply device shown in FIG. 4 is of a so-called double section type, which takes measures against section overflow. In other words, even if a ground fault occurs on one of the tram tracks divided into sections, an arc is not generated due to the potential difference between the tram tracks when an electric car passes through the section, This prevents the section and the pantograph of the electric car from being damaged by the arc.

Next, the operation shown in FIG. 4 will be described. First of all, is the electric power used for powering the electric vehicle powered by a commercial frequency (not shown) at a substation? Three-phase AC voltage received from the TL source bus through an AC circuit breaker (not shown) is converted to an appropriate voltage by a transformer (not shown), and then converted to DC power by a forward power converter I, and then divided into sections. Tram lines 9a, 9b, 9c and 9d, 9e, 9f
is supplied to the electric car 12 by. The electric car 12 is powered by DC power supplied as shown in -.

Next, when the electric car 12 existing under the overhead contact line 9e is in regenerative operation, the regenerative power is transferred from the overhead contact line 9e to the DC disconnector 8.
(1) The regenerative power is supplied to the DC bus 3 via the regenerative diode 5e and the regenerative circuit breaker 6.The regenerative power supplied to the R1 line 3 is supplied to the electric train line 9a on which the power running electric car (not shown) is operated, 9b, 9c, 9d, and 9'', or via the inverse power converter 2 to the commercial frequency power supply bus.

D9 Problems to be Solved by the Invention In the conventional example configured as shown in FIG. 4, the forward power converter 1 and the reverse power converter 2 are directly connected in antiparallel via the DC bus 3, When commutation of the reverse power converter 2 fails, a fault current is supplied from the forward power converter l side, causing a problem that the fault is magnified.

In addition, in the configuration shown in Fig. 4, the electric train tracks 9a, 9b, 9c
.

Direct ME to 9d, 9e, 9r? To supply Ii power, power running circuit breakers 4a, 4b, 4c, 4d, 4e,
There is a problem in that power must be supplied through each 4f separately, and six power running circuit breakers are required. Furthermore, a regenerative circuit breaker 6 is required in order to supply the regenerated electric power of the electric car generated on one electric train line to the other electric car line or to the inverse force converter side. Therefore, seven expensive Zyristor circuit breakers are required, making the substation equipment extremely large. This caused problems such as the equipment costs for substation construction becoming enormous. In addition to the above, power running III Ij
! , disconnectors 4a, 4b, 4c, 4d, 4e, 4
Since the regenerative circuit breaker 6 and the regenerative circuit breaker 6 have different properties and purposes, there is a problem in that the control means (protection sequence) becomes extremely complicated.

Means for Solving the E0 Problem This invention consists of bridge-connecting diodes, each with a separate first . Second. a third diode bridge circuit; and a third diode bridge circuit; The cathodes and anodes of the diodes constituting each side of the second diode bridge circuit are separately connected to a common connection point, and the first diode bridge circuit is separated by a dead section forming a double line. 2nd and 3rd
．． a fourth electric train track; and the first electric train line. A dead section is provided between the second tramway and the third tramway. A connection point is provided between the fourth electric train line and the two lines separated by a dead section, and where the cathodes and anodes of the diodes constituting one arm of the third diode bridge circuit are commonly connected. 5. Connected all at once. 6th electric train track, and the 1st and 2nd tram tracks. Three sets of circuit breakers are provided in each of the third diode bridge circuits and are respectively connected between the commonly connected cathode and anode sides of these bridge circuits; a DC disconnector interposed at intervals in an electric path connecting the cathode side common connection points of the second diode bridge circuit and an electric path connecting the anode side common connection points;
ntj 1st. Two sets of diode series circuits each separately provided in the second diode bridge circuit and connected separately between the commonly connected anode side and cathode side of these bridge circuits, and each common to the two sets of serious offenders' diode series circuits. A power running bus bar connected to the connection point and the connection point where the cathodes and anodes of the diodes constituting the other arm of the third diode bridge circuit are commonly connected; Order of converting to DC power 7 [Force converter and the first. Two sets of stopper diodes whose respective anodes are individually connected to the commonly connected anode side of the second diode bridge circuit and whose cathodes are commonly connected, and the commonly connected cathode sides of these two sets of stopper diodes. It is characterized by comprising a regeneration bus connected to the regeneration bus, and an inverse power converter connected to the regeneration bus to convert DC power into AC power.

F1 effect When configured as described above, the first effect. Second. Third. 4th, 5th
．． There are only 3 sets of circuits that supply DC power to the 6th overhead contact line. Even in the event of an accident involving a motor or regenerative busbar, the problem can be dealt with reliably by tripping the circuit breaker.Also, since three sets of circuit breakers can control the regenerative current for one power run, the device is extremely inexpensive. It can be manufactured and is economically advantageous.

The fifth section is further divided into double sections. Since the 2t block is connected to the 6th train line, the 1st to 4th ``di I
When a ground fault (1) occurs on the I+ line, the circuit breaker on the fault line side and the 5th If the circuit breaker on the 6th train track side is opened, the section over phenomenon will be prevented. Moreover, the commonly connected anode side of the two diode bridge circuits and the commonly connected cathode side of the two sets are connected by a DC disconnector to create a mutual standby system in which power is mutually exchanged between the two sets of diode bridge circuits. So, if one circuit breaker fails, power can be supplied through the other circuit breaker.

G, Example G8. 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, 41, and 51 are four diodes 22a to 22d and 4 arranged as shown in the polarity.
These are first, second, and third diode bridge circuits composed of 2a to 42d and 52a to 52d. The diode 22 in this first diode bridge circuit 21
A common connection point 26 between a and 22b is connected to the first overhead contact line 9a via a DC disconnector 8a. The diode 42a
The single connection point 46 of and 42b is connected to the second overhead contact line 9b via a DC disconnector 8b. The diode 22c
and 22d' (the communication reading point 27 is connected to the 37th [i-lane 9d through the DC disconnector 8d. The diode 4
A common connection point 47 between 2c and 42d is connected to the 47th It lane 9e via a DC disconnector 8e. A common connection point 56 between the diodes 52a and 52b is connected to the fifth overhead contact line 9c via a DC disconnector 8C, and to the sixth overhead contact line 9r via a DC disconnector 8[. The anode of a first Sirisk circuit breaker (this circuit breaker may be a DC high-speed circuit breaker) 23 is connected to a common connection point Z4 on the cathode side of the diodes 22a, 22c. The cathode of this SIRISK circuit breaker 23 is a diode 22b.

22 (connected to the anode side common connection point 25 of 1).

Common connection point 4 on the cathode side of diodes 42a and 42c
4 is connected to the anode of a second cyrisk circuit breaker (this circuit breaker may be a DC high speed circuit breaker) 43.

The cathode of this cyrisk circuit breaker 43 is a diode 42
b, 42 (connected to the common connection point 45 on the anode side of diodes 52a, 52c). A third cyrisk circuit breaker (this circuit breaker may be a DC high-speed circuit breaker) is connected to the common connection point 54 on the cathode side of the diodes 52a, 52c. The cathode of this thyristor circuit breaker 53 is connected to a common connection point 55 on the anode side of diodes 52b and 52d.The thyristor circuit breaker 23 has diodes 61 and 62 connected in series with the polarities shown. The connected diode series circuits 60 are connected in parallel.The thyristor circuit breaker 43 is connected in parallel with a diode series circuit 70 in which diodes 71 and 72 of the illustrated polarity are connected in series.

Common connection point 63 between diodes 61 and 62, common connection point 73 between diodes 71 and 72, and diode 52c
A common connection point 57 between and 52d is connected to the powering (DC) bus 3. The cathode side common connection point 24 of the bridge circuit 21 and the cathode side common connection point 4 of the bridge circuit 41
A DC disconnector 81 is connected to lil No. 4. 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
．． 82 is normally open and is closed when either one of the thyristor circuit breakers (23 or 43) fails.

In Fig. 1, the forward power converter 1 is a sirisk rectifier:
(It may be.

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

When the thyristor circuit breakers 23, 43, and 53 are normally closed, the power running current of the forward power converter 1 is
Diode 61.71.52c → Cyrisk circuit breaker 23
．． 43.53 → Diode 22b, 42b, 22d
, 42d.

52b-DC disconnector 8a, 8b, 8d, 8e,
8c, 8r to the 1st. Second. Third. 4th. Fifth.
Sixth? TI lanes 9a, 9b, 9d, 9e, 9
c, supplied to 9f.

In addition, the regenerative current generated in the 47th ri lane 9e is transferred from the DC disconnector 8e to the diode 142c to the Zyristor circuit breaker I3.
→Diode 42. b → is supplied to the second overhead contact line 9b via the DC disconnector 8b, or is supplied to the DC disconnector 8e-
Diode-142cm thyristor breaker 43 → diode 72 → powering bus 3 → diode 61.52c → thyristor breaker 23.53 → diodes 22b, 22d.

52b-+1. 3rd, 5th. No. 6 train tracks 9a, 9d,
9c, 9r.

In addition, Part ■, Part 2. Third. Fifth. 67th ft lane 9a.

The regenerative currents generated in 9b, 9d, 9c, 9r are similarly connected to diode bridge circuits 21.41.51. Diode series circuit 60.70 and thyristor circuit breaker 23.4
3.53 and is supplied to each electric train line.

As described above, the power running current is transferred to each electric train line 9a, 9b, 9
c.

When supplying to 9+1.9Q, 9r, 3 sets of thyristor circuit breakers 23.43.53 and diode bridge circuit 2
1.41゜5! Since control can be achieved simply by inserting the diode series circuits 60 and 70, there is an advantage that 63 sets of expensive thyristor circuit breakers can be omitted compared to B in FIG. This allows the power supply device to be manufactured at low cost.

In addition, each electric train line 9a, 9b, 9c, 9d, 9
e. When controlling the regenerative current generated at 9f, the regenerative circuit breaker This has the advantage that it is not necessary.

Furthermore, since both the powering current 7a and the regenerative current pass through the thyristor circuit breaker 23, 43.53, the circuit breaker 2
If 3.43.53 is released at 1111, both power running and regeneration currents will be interrupted by three sets of thyristor circuit breakers 23.43°5
3, which can simplify the protection sequence.

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 7jl occurs at point F1 of the first overhead contact line 9a in the figure, the power running current is interrupted by opening the SIRISK circuit breaker 23. After that, the DC disconnector 8a is opened,
If the thyristor circuit breaker 23 is closed, the third electric train line 9d
It is possible to regenerate the electric power generated on the third overhead contact line 9d.

Said 1st. When a ground fault accident occurs on the third contact lines 9a and 9d, the electric car 12 moves from the third contact lines 9b and 9e to 9a.
.

Assume that the vehicle is traveling toward the 9d side. In this case, when the circuit breaker 23 of the third diode bridge circuit 51 is opened, the circuit breaker 53 of the third diode bridge circuit 51 is opened.
Open the 5th. The 6th electric train tracks 9c and 9'' are made voltage-free.This causes the electric car 12 to become dead.
, no arc occurs when passing through the electric car 1
Prevent the pantograph No. 2 from burning out with 11-. At this time, the second Zyristor circuit breaker 43 remains closed. Fourth? [Roadway 9b.

Power supply to 9e continues without any problem. Also, the 2nd and 4th
If a ground fault occurs on the tram tracks 9b, 9e, the operation is simply to open the Cyrisk circuit breaker 43 and circuit breaker 53 in the same manner as described above, and the first and third TL city lines 9a, 9
The power supply to d continues without any problem. Furthermore, if a ground fault occurs on the 5th and 6th tram tracks 9c and 9f, →)
If only the iris breaker 53 is opened, the power running current from the forward power converter l and the first to eleventh overhead contact lines 9a, 9
Regenerative current from b, 9d, and 9e will not flow into the fault point. For this reason, the first. Second Zyristor circuit breaker 23
．． There is no need to open 43, 1st to 4th? Power supply to the ti lanes 9a, 9b, 9d, and 9e continues without any problems.

Here, during power running of the electric vehicle, the extended power supply 71 supplied from the adjacent substation flows, for example, along the following route. That is, adjacent substation (not shown) - 4th overhead contact line 9e - DC disconnector 8e - Diode - 142cm Cyrisk circuit breaker 4
3-diode 42b-supplied to the second overhead contact line 9b via the DC disconnector 8b or DC disconnector 8e→
Diode 42c → Zyristor circuit breaker 43 - Diode 72 - Power running bus 3 - Diode 61.52cm Thyristor circuit breaker 23.53 - Diode 22b, 22+1
．． 52b - the first through DC disconnectors 8a, 8d, 8c, 8f; Third. Fifth. No. 6 tram tracks 9a, 9d.

9c and 9f. When extending power supply from such an adjacent substation, the desired end section (1st and 3rd contact line 9
If only armor type stop is performed on a and 9d), the first
Since it only opens the Zyristor circuit breaker 23, the second. 4th. Fifth. Sixth? li lanes 9b, 9e.

Extended power supply can be continued to the end sections on the 9c and 9f sides, allowing smooth operation of electric cars.

” If an accident such as a ground fault occurs during power supply, will the risk of being connected to the accident line be cut off? 9r 23.

Since it is interrupted at 43 or 53, there is no need to interrupt it at the adjacent substation that supplies the extended supply ri 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 two-legged embodiment, if a ground fault occurs at point F7 of the power running bus 3, the cyrisk circuit breaker 23° 43, 5
If 3 is cut off, tram lines 9a, 9b, 9C, 9
(The regenerative current generated at 1°9e and 9f is connected to the DC disconnector 8.
a, gh.

8c, 8d, 8e, 8r → diode 22a,
42a, 52a, 22c.

42c, 52a → Zyristor circuit breaker 23.43.53
- can be prevented from flowing into the fault point F through the path of the diode 62.72.52d. Further, at this time, it is possible to prevent the extension feed 711 current flowing from the adjacent point F from flowing into the fault point F through the same path as described above.

This can prevent power outages from spreading to the reservoir substation.

Here, if the DC disconnectors 81 and 82 are closed when the Cyrisk circuit breaker 23 fails, the forward power converter l
Is the powering current of the powering bus 3-diode? +-・Sirisk circuit breaker 43→DC disconnector 82-diode 221+
, 22d - It is supplied to the 1st and 3rd overhead contact lines 9a and 9d via the DC disconnectors 8a and 8d, or the power running bus 3 and the diode 6[→DC disconnector 81→Zyristor circuit breaker 43] DC disconnector 82-diode 22b,
22d - the first through the DC disconnectors 8a, 8d. 37th
1X lanes 9a, 9(I).

This could improve the reliability of the system itself. In addition, by closing both the DC disconnectors W81 and W82 when the Cyrisk circuit breaker 23 fails, not only the power running currents of the similar power conversions r and l but also the extended power supply current from the adjacent substation can be changed to the first. 37th (i-lane 9a, 9d
can be supplied to In other words, the extended power supply current from the adjacent substation is the second. 4th II Army Track 9b.

9e-DC disconnector 8b, 8e-+diode 42a,
42c → Sairisk circuit breaker 43 → DC disconnector 82-
Diode 22b.

22d - the first through the DC disconnectors 8a, 8d; Third?
[Supplied to i-lanes 9a and 9d. In addition, when the Cyrisk circuit breaker 23 fails, the DC disconnection circuit i81.82 is automatically closed. 6th train track 9
c.

The regenerative current generated at 9r is connected to DC disconnector 8c, 8r - diode 52a - Cyrisk circuit breaker 53 - diode 5
2d - Power running bus 3 - Diode 71 - Cyrisk circuit breaker 43 - DC disconnector 82 - Diodes 22b, 22d
→The first one via the DC disconnectors 8a and 8d. It can be supplied to the third electric train tracks 9a and 9d. Furthermore, when the Cyrisk circuit breaker 23 fails, the regenerative current generated in the third overhead contact line 9d by closing both the DC disconnectors 81 and 82 is transferred to the DC disconnector 8d - the diode 22C -
It can be supplied to the first overhead contact line 9a via 1-DC disconnector 81-Sirisk circuit breaker 43-DC disconnector 82-diode 22b-DC disconnector 8a.

Also, when the Cyrisk circuit breaker 43 fails, the second circuit is closed by closing the DC disconnectors 81 and 82 in the same manner as described above.
Be able to supply power to the 4th train tracks 9b and 9e.

G7. Embodiment of the Second Invention Next, an embodiment of the second invention will be explained 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 the common connection point 25 on the anode side of diodes 22b and 22d and the anode side of diodes 42b and 42d. A stopper diode 28 is connected to the common connection point 45.
．． 48 anodes are connected to each. 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 I11 bus 29. In FIG. 2, the forward power converter l may be a thyristor rectifier.

In the above embodiment, the operation during power running, at the time of an accident, and at the time of failure of the circuit breaker is the same as that of the circuit shown in FIG. 1, so a description thereof will be omitted.

The regenerative current generated in the fourth overhead contact line 9e is transferred to the DC disconnector 8
e → diode 42cm circuit breaker 43 → diode 42b - 4th electric train line 9e via DC disconnector 8b
or DC disconnector 8e- + diode 42c → thyristor breaker 43 → diode 72 → power running bus 3 → diode 61.52c → thyrisk circuit breaker 23.53 → diodes 22b, 22d, 52b →
The first
．． 3rd゜5th. 6711th Army Lines 9a, 9d, 9c,
9f or DC disconnector 8e - diode 42cm thyristor circuit breaker 43 - stopper diode 48 - regeneration Iff C): line 29 - reverse power converter 2
It is regenerated to the commercial frequency power supply side (not shown) via. still,
1st. Second. The regenerative currents generated on the third overhead contact lines 9a, 9b, and 9d are connected to the diode bridge circuit 21 in the same manner as described above.
．． 41. Cyrisk circuit breaker 23.43. It flows through the stopper diode 28.413 and is either supplied to the respective overhead contact line or regenerated to the inverse power converter 2.

Also, 5th. The regenerative current generated in the 6th overhead contact line 9c, 9'' is connected to the DC disconnector 8c, 8'' - diode 52a =
Thyrisk circuit breaker 53 → diode 52d → power running bus 3 - diode 61.71 - thyristor circuit breaker 23°4
3-diodes 22b, 42b, 22d, 42d
→The first one via DC disconnectors 8a, 8b, 8d, and 8e. Second. Third. 4th electric IL line 9a, 9b, 9d
, 9e, or DC disconnector 8c, 8[-diode 52a→Sirisk circuit breaker 53-diode 5
2d - Power running bus 3 - Diode 61 or 71 - Cyrisk circuit breaker 23 or 43 -> Stopper diode 28 or 48 -
The power is regenerated to the commercial frequency TL source (not shown) via the regeneration bus 29 and the inverse power converter 2.

Further, in the above embodiment, F of the regeneration bus bar 29.

If a ground fault occurs at the
If 43 is cut off, tram lines 9a, 9b, 9(1
, 9e, the regenerative 7tt flow is connected to the DC disconnections 8a and 8b.
, 8d, 8e - diode 22a, 42a,
22c, 42cm thyristors 23.43→stopper diodes 28.48 can be prevented from flowing into the fault point F3. In addition, at this time, the current flowing from the adjacent substation passes through the same path as above to the fault point F3.
Prevent it from flowing into. Therefore, it is possible to prevent the power outage from spreading to other substations.

Furthermore, if a ground fault occurs at 13 points on the regeneration bus 29, if the Cyrisk circuit breaker 53 is shut off,
c, the regenerative current generated in 9r is connected to the DC disconnector 11c.

8r-・Diode 52a-Sirisk circuit breaker 53→Diode 52d-Power running bus 3→Diode 61 or 71
- It is possible to prevent the water from flowing into the fault point F through the path of the tozyristor circuit breaker 23 or 43→stopper diode 28°48.

In addition, in the event of a ground fault accident on the first electric train track 9a, the
Diode bridge circuit 21. Since H is connected through the stopper diode 28, 48, simply opening the first Zyristor circuit breaker 23 causes the fault point F to pass through the second Zyristor circuit breaker 43 of the healthy line.

No current is supplied to the side. This can prevent the spread of accidents.

Furthermore, in the above embodiment, the horn row bus bar 3 and the regeneration bus bar 29
Since diodes 62 and 72 are connected between them according to the polarity shown in the diagram, if the reverse power horn converter 2 fails to commutate, the fault current will flow into the reverse power converter 2 side due to the diodes 62 and 72. You can prevent it from happening.

This makes it possible to prevent the accident from expanding even if the reverse power converter 2 fails to commutate.

G3. Embodiment of the Third Invention Next, an embodiment of the third invention will be explained 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 anode of the stopper diode 28 is connected to the common connection point 25 on the anode side of the diode bridge circuit 21, and the stopper diode 4
The anode of the stopper diode 28 is connected to the anode side common connection point 45 of the diode bridge circuit 41, the cathode of the stopper diode 28 is connected to the anode of the diode 62 and the regeneration 1; 72 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 11 line 29 instead of the reverse power converter 2, and the other parts are shown in FIG. It has the same configuration as .

In FIG. 3, the forward power converter 1 may be a Zyristor rectifier.

Next, the operation of the embodiment 1- will be described.

The power running current of the forward power converter 1 flows in the same manner as in FIGS. 1 and 2.

In addition, the regenerative current generated in the sixth overhead contact line 9a is transferred to the second electric current through the DC disconnector 8e, the diode 142c, the Zyristor circuit breaker 43, the diode 42b, and the DC disconnector 2) 8b.
J line 9b or DC disconnector 8e-diode
142c - Zyristor circuit breaker 43 - Stopper diode 48 - Diode 72 - Power running bus 3 - Diode - F'
61.52c →'J-iris'l block'r, 23.
53 - Diodes 22b, 22d, 52b -> 1st via DC disconnectors 8a, 8d, 8c, 8r. Third. Fifth. No. 6 tram tracks 9a, 9d.

9c, 9f or DC disconnector 8e
- Diode 42c → Zyristor circuit breaker 43 → Stopper diode 48 - Regeneration bus 29 - Bidirectional power converter 3
4 to the commercial frequency power source (not shown). In addition, 1st. Second. Third. Fifth. Sixth? [lane 9a,
9b, 9 (1, 9C, 9f generated regeneration 7!i flow and the same diode bridge circuit 21.41.51.
Zyristor circuit breaker 23.43.53. The power is supplied to each electric train line via the diode series circuit 60.70 and the stopper diodes 28, 48, or is regenerated to the bidirectional power converter 34. In addition, since the diodes 62.72 are inserted between the power running bus 3 and the regeneration bus 29, the bidirectional power converter 34 may fail in commutation during reverse power conversion operation. It is possible to prevent fault current from flowing into the bidirectional power converter 34 side. As a result, it is possible to prevent the expansion of the 6 accidents due to commutation failure during the reverse power conversion operation of the bidirectional power converter 34.

"Like two legs, the first to sixth train tracks 9a, 9b, 9
c.

When supplying powering current to 9d, 9e, and 9f, three sets of Zyristor circuit breakers 23.43.53, diode bridge circuits 21.41.51, and diode series circuits 6
Since it can be controlled with only 0.70, there is an advantage that 63 sets of SI risk circuit breakers can be omitted compared to the conventional one. This allows the entire feeder 71i device to be manufactured at low cost. In addition, each electric train line 9a, 9b, 9c, 9d, 9e, 9r
Three sets of Cyrisk circuit breakers 23, 43, 53. Guiode series circuit 60.7
0. Since it can be controlled using only the diode bridge circuit 21, 41, 51 and the stopper diode 28, 48, there are advantages similar to those described above.

Furthermore, the power running current and regenerative current and the muzyristor circuit breaker 2
Since it passes through 3°43.53, by opening the cyrisk circuit breakers 23.43.53, the three cyrisk circuit breakers 23.43.53 can shut off both sets of flows for the 3rd regeneration of power running. Like this, is it a first-year student? For example, by using a Cyrisk circuit breaker that has the function of interrupting the Ii flow, it is possible to prevent a ground fault at the F3 point of the overhead contact line 9a in Fig. 3.
When a fault occurs, Cyrisk circuit breaker 2: (is opened)
If so, the powering current is cut off.

Thereafter, if the DC disconnector 8a is opened and the SIRISK circuit breaker 23 is opened, there will be no problem in the operation of the power running 7u electric car running under the third electric train track 9d.

In the above embodiment, if a ground fault occurs at point F2 of the power running bus 3, if the cyrisk circuit breaker 23.43 is shut off, the first to fourth N lanes 9a, 9b, 9d.

The regenerative current generated at 9C causes DC disconnection 8:1F8a, 8
b, 8d.

8e → Diode 22a, 42a, 22c, 42
It can be prevented from flowing into the fault point ■P through the path c→Zyristor circuit breaker 23.43→stopper diode 28.48→diode 62.72. Also, at this time, the extended pay flowing from the adjacent substation? [1 current can be prevented from flowing into the fault point F2 through the same path as above. In addition, if the thyristor circuit breaker 53 is shut off when a ground fault occurs at the F2 point of the power running m line 3, the fifth. The regenerative current generated on the 6th overhead contact line 9c and 9f is connected to the DC disconnector 8c.
.

8"-> Diode 52a - Zyristor circuit breaker 53 -> Diode 52d can be prevented from flowing into the fault point F2 through the path.

In addition, in the above embodiment, when a ground fault occurs at point F3 of the regeneration bus 29, the circuit breakers 23 and 43
If you cut off the tram lines 9a, 9b, 9d, 9
The regenerative current generated in e is connected to DC disconnectors 8a, 8b, 8
d, Be → diode 22a, 42a, 22c,
42c→Zyristor cutoff aTh23. It can be prevented from flowing into the fault point F3 through the path 43-stopper diode 28.48. Also, at this time, the current flowing from the adjacent substation passes through the same path as above and reaches the fault point!・′
3 can be prevented from flowing in. Therefore, it is possible to prevent power outages from spreading to other substations.

Furthermore, if a ground fault occurs at point F3 of the regenerative r upper wire 29, if the Cyrisk circuit breaker 53 is shut off, the regenerative current generated on the overhead contact lines 9c and 9r will be transferred to the DC disconnector 8c,
8[-Diode 52a-Sirisk circuit breaker 53-Diode 52d-Power running bus 3-Diode 61 or 7t
→Zyristor circuit breaker 23 or 43 →Stopper diode 2
8.48 can be prevented from flowing into the accident point F.

In addition, the Cyrisk circuit breaker is installed on 3 train tracks for 6 tracks.
Since only one piece is required, there is an advantage that the circuit breaker control device and its handling become simple.

Here, the bidirectional power converter 34 is operated for forward power conversion U-
In this case, the current flowing from the converter 34 flows through the following path. That is, bidirectional power converter 34 - diode 62.72 -> diode 61.71.52c -> Zyristor circuit breaker 23.43.53 - diode 22b.

42b, 22+1.42d, 52b → DC disconnector 8a, 8b, 8d, 8e.

8c, 8" through 1st, 2nd, 3rd, 4th, 5th, 31st X lanes 9a, 9b, 9d, 9e, 9c,
9r is supplied. In this way, the bidirectional power converter 34
By making a forward power converter U and supplying the power running current, it is possible to reduce the capacity of the forward power converter L, and in the event of a failure of the forward power converter, the power running current can be supplied without causing a power outage to the substation. You can supply it. In addition, since a stopper diode 28.48 with the illustrated polarity is connected between the common connection point 25.45 on the cathode side of the Zyristor circuit breaker 23.43 and the regeneration bus 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 Zyristor circuit breaker 23.43.

Here, if the DC disconnectors 81 and 82 are closed when, for example, the Zyristor circuit breaker 23 fails, the forward power converter 1
The power running current is the power running bus 3 - diode 71 - Zyristor circuit breaker 43 - DC disconnector 81 - diode 22b,
22d - 1st - 3i via DC disconnectors 8a and 8d
It is supplied to the i-lanes 9a, 9d, or the power running bus 3→diode 61→DC disconnector 82→Zyristor circuit breaker 43→DC disconnector 81→diodes 22b, 22d
- - The first through the DC disconnectors 8a and 8d. It is supplied to the third electric train line 9.1.9cl.

This can improve the reliability of the system itself. Also, by closing both the DC disconnectors 81 and 82 when the Zyristor circuit breaker 23 fails,
1. Not only the power running current of the forward power converter 1 but also the extended power supply current from the adjacent substation. 3rd train line 9a, 9 (I).In other words, the extended power supply current from the adjacent substation is the 2nd, 4th?Iff line 9b.

9o-DC disconnector 8b, Be-diode 42a,
42cm Zyristor circuit breaker 43 → DC disconnector 81 → diode 22b.

22 (1-1st and 3rd via DC disconnectors 8a and 8d
It is supplied to the 1X lanes 9a, 9 (1. Also, when the Zyristor circuit breaker 23 fails, the DC disconnector 81.82
By closing them together, the fifth. 6th train track 9c.

The regenerative current generated in
2d-DJ line for power running 3-diode 71→Sirisk circuit breaker 43-DC disconnector 81-diode 22b, 22
d-DC disconnector 1'la, 8d through the 1st and 37th
[can be supplied to the lanes 9a and 9d. Furthermore, when the Zyristor circuit breaker 23 fails, the DC disconnector 8
1. Regeneration occurred on the third electric train track 9d by closing both υ-? Ii flow is DC disconnection a38d→
It can be supplied to the first overhead contact line 9a via the diode 22c → DC disconnector 82 - Zyristor circuit breaker 43 → DC disconnector 81 → diode 22b - DC disconnector 8a.

Furthermore, if the Zyristor circuit breaker 43 fails, the second circuit breaker 81, 82 is closed in the same manner as described above.
Be able to supply power to the 4th train tracks 9b and 9e.

+1. Effects of the Invention As described above, the present invention provides the following effects.

(a) If only the desired armor-shaped section is stopped during extended power supply, extended power supply can be continued to the armor-shaped 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, it is possible to further simplify the protection sequence, minimize the effects of accidents, and improve the delay efficiency of electric vehicles.

Since a C9 stopper diode is installed, even if a ground fault occurs on one side of the train line, if the breaker on the accident side is shut off, the accident Tli ME will not flow in from the other circuit breaker. This will prevent the spread of accidents.

d. Since a diode is inserted between the power running bus and the regeneration bus, when commutation fails during reverse power conversion operation, the flow from the forward power converter to the reverse power converter or bidirectional power converter side will be reduced. Since the fault current of J+11' can be blocked by a diode, the expansion due to the reverse power converter or bidirectional power converter J+11' can be prevented.

C1 Compared to the conventional example, a regenerative circuit breaker and three sets of power running circuit breakers are not required, so the equipment cost is very profitable.

In addition, since the number of circuit breakers is reduced, the protection sequence becomes simpler and reliability is improved. Also, is there an accident with 71 powering currents and 1 regenerative current with 3 sets of circuit breakers? It is possible to cut off the li current and the extended supply current from the adjacent substation.
The device is greatly simplified and the protection sequence is simplified, resulting in increased reliability.

f. Because the forward power converter of the bidirectional power converter can supply horn running power, the power capacity of the forward power converter can be reduced, and when the forward power converter fails, power running power can be supplied. There is no power outage at the substation.

g. If a ground fault occurs on one tramway, open the DC disconnector that supplies that line after the circuit breaker is opened, and then close the breaker, and a regenerative electric car will 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 single power running cattle), it will be possible to prevent the accident from spreading, significantly increasing the reliability of the system. There are advantages to improving.

i, first? Between the L lane and the 271st lane, the 371st lane
1 lane and 4th lane? The 5th lane is separated by a dead section between the ti lanes. 5 on the 6th train track
Since a circuit breaker is connected, when a ground fault occurs on one side of the overhead contact line, by opening the circuit breaker, it is possible to prevent arcing when the electric car crosses a section. At this time, since there is no need to open the circuit breaker connected to the overhead contact line on the other side, power supply continues to the overhead contact line on the other side without being affected by the serious ground fault accident.

j, GTO (gate turn off the risk) on the circuit breaker
When a circuit breaker is used, when the regenerative current is interrupted by the regenerative circuit breaker 6 in a conventional device, for example, the circuit shown in FIG.
A reverse bias voltage is applied to 'l'O). Generally G
Since i'O has a self-extinguishing function, it is not used to apply a reverse bias voltage.

Therefore, in order to use the GTO as the circuit breaker in the circuit shown in FIG. 1, 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 c'ro is used as the circuit breaker of the present invention, the reverse voltage applied from the power running bus 3 is applied to the diode 62, 72, 52d and the stopper diode 28.
．． 48 and are blocked by tram tracks 9a, 9b, 9
c.

The reverse voltage applied from 9d, 9e, and 9r is the diode 22b.

22d, 42b, 42d, 52b. 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 produce inexpensive equipment,
It is economically very advantageous.

k, 1st. 2 provided in the second diode Pritzno circuit
If one of the circuit breakers in a set fails, we use the Mutual Backup method, so we can disconnect the DC from the other circuit breaker to the overhead line connected to the failed circuit breaker. Power can be supplied through the device, improving the reliability of the system itself.

[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, and Fig. 3 is a circuit diagram showing an embodiment of the third invention. , FIG. 4 is a circuit diagram of a conventional example. ! ...Forward power converter, 2... Reverse power converter, 3...
・Power running busbar, 9a-9 [...tram track, 21.41
．． 51...Diode bridge circuit, 23.43.5
3... Thyristor circuit breaker, 28.48... Stopper diode, 29... Regeneration@, line, 34... Bidirectional power converter, 60.70... Diode series circuit, 8
1.82...DC disconnector. Figure 4 Six conventional circuit diagrams

Claims (3)

[Claims] (1) First, second, and third diode bridge circuits each formed by bridge-connecting diodes, and cathodes of diodes constituting each side of the first and second diode bridge circuits; The first, second, third and fourth sections are separately connected to a common connection point with the anode and separated by a dead section forming a double track.
A tram track is provided between the first and second tram tracks, separated from both tracks by a dead section, and the third tram track is separated from both tracks by a dead section.
, a connection point which is provided between the fourth electric train line and the two lines by a dead section, and where the cathode and anode of the diode constituting one arm of the third diode bridge circuit are commonly connected. and the first, second, and third diode bridge circuits, which are separately connected to the fifth and sixth overhead contact lines connected to the three sets of circuit breakers connected separately, and a DC disconnector inserted in the electric line connecting the common connection points on the cathode side and the electric line connecting the common connection points on the anode side of the first and second diode bridge circuits, respectively. and two sets of diode series circuits provided separately in the first and second diode bridge circuits and respectively connected between the commonly connected anode and cathode sides of these bridge circuits; a power running bus bar connected to each common connection point of the diode series circuit and a connection point where the cathodes and anodes of the diodes constituting the other arm of the third diode bridge circuit are commonly connected; A direct current power supply device comprising: a forward power converter connected to the converter and converting alternating current power into direct current power. (2) first, second, and third diode bridge circuits each formed by bridge-connecting diodes; and cathodes of diodes constituting each side of the first and second diode bridge circuits; The first, second, third and fourth sections are separately connected to a common connection point with the anode and separated by a dead section forming a double track.
A tram track is provided between the first and second tram tracks, separated from both tracks by a dead section, and the third tram track is separated from both tracks by a dead section.
, a connection point which is provided between the fourth electric train line and the two lines by a dead section, and where the cathode and anode of the diode constituting one arm of the third diode bridge circuit are commonly connected. and the first, second, and third diode bridge circuits, which are separately connected to the fifth and sixth overhead contact lines connected to the three sets of circuit breakers connected separately, and a DC disconnector inserted in the electric line connecting the common connection points on the cathode side and the electric line connecting the common connection points on the anode side of the first and second diode bridge circuits, respectively. and two sets of diode series circuits provided separately in the first and second diode bridge circuits and respectively connected between the commonly connected anode and cathode sides of these bridge circuits; a power running bus bar connected to each common connection point of the diode series circuit and a connection point where the cathodes and anodes of the diodes constituting the other arm of the third diode bridge circuit are commonly connected; and a forward power converter that converts alternating current power into direct current power; and the commonly connected anode sides of the first and second diode bridge circuits, the anodes of which are separately connected, and the cathodes of which are commonly connected. two sets of stopper diodes, a regeneration bus bar connected to the commonly connected cathode sides of these two sets of stopper diodes, and a reverse power converter connected to the regeneration bus bar for converting DC power into AC power. A DC power supply device comprising: (3) first, second, and third diode bridge circuits each formed by bridge-connecting diodes; and cathodes of diodes constituting each side of the first and second diode bridge circuits; The first, second, third and fourth sections are separately connected to a common connection point with the anode and separated by a dead section forming a double track.
A tram track is provided between the first and second tram tracks, separated from both tracks by a dead section, and the third tram track is separated from both tracks by a dead section.
, a connection point which is provided between the fourth electric train line and the two lines by a dead section, and where the cathode and anode of the diode constituting one arm of the third diode bridge circuit are commonly connected. and the first, second, and third diode bridge circuits, which are separately connected to the fifth and sixth overhead contact lines connected to the three sets of circuit breakers connected separately, and a DC disconnector inserted in the electric line connecting the common connection points on the cathode side and the electric line connecting the common connection points on the anode side of the first and second diode bridge circuits, respectively. and two sets of stopper diodes whose respective anodes are separately connected to the commonly connected anode sides of the first and second diode bridge circuits, and the cathodes of these two sets of stopper diodes and the first, two sets of diode series circuits each connected between the commonly connected cathode side of the second diode bridge circuit, and each common connection point of the two sets of diode series circuits and the third diode bridge circuit. a power running bus connected to a connection point where the cathodes and anodes of the diodes constituting the other arm are commonly connected; a forward power converter connected to the power running bus and converting alternating current power into direct current power; A regeneration bus that is commonly connected to the cathodes of the two sets of stopper diodes, and a bidirectional power converter that is connected to the regeneration bus and converts DC power to AC power or AC power to DC power. A DC power supply device characterized by: