JPS6220734A - Dc power feeding device - Google Patents

Abstract

PURPOSE:To improve the reliability by arranging a combination of a circuitbreaker and a diode bridge circuit in every feeder line for up/down trains while arranging a stopper diode for blocking the current from the counterpart circuitbreaker and the fault current from a forward power converter. CONSTITUTION:Circuitbreakers 23, 43 and diode bridge circuits 21, 41 combined to flow the powering and regenerating current through a same circuitbreaker are arranged respectively in the feeder lines 9a-9c, 9d-9f for up/down trains. Stopper diodes 28, 48 are arranged between the anode side and a regenerating bus 29 in order to block flow-in of current from the counterpart circuitbreaker. Furthermore, a stopper diode 32 is arranged to block flow-in of fault current from the forward power converter side upon occurrence of fault during reverse power conversion through an unilateral power converter 34. Consequently, system reliability against the fault at the feeder line side is improved while regenerating current can be utilized effectively.

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention relates to 'fE @ railway power supply equipment, and in particular to converting AC power into DC power and supplying it as a drive source for electric cars [flow type] Concerning railway power supply equipment.

B1 Summary of the Invention This invention relates to a power supply system for a flow-type electric railway, in which a circuit breaker and a diode pringed circuit are combined so that the current during running and the current during regeneration flow through the same circuit breaker. One set of these is provided for each of the upper and lower tram lines, and a stopper diode tm is connected between each commonly connected anode side of the bridge circuit and the regeneration bus bar to cut off the other side. A stopper diode is installed to prevent current from flowing into the main forward power converter side, and to prevent fault current from flowing into the main forward power converter side even if an accident occurs during reverse power conversion of the bidirectional power converter. This is a technology that can significantly improve the reliability of the system in case of accidents on the railway line, and also makes effective use of regenerative current. A DC substation is configured with one or several sets of converters installed at intervals. Further, the DC output lI of the valley converter is connected to a DC high-speed circuit breaker dedicated to the converter, and the AC input side of the device is connected to a common bus conductor. That is, the power supply system including the forward power converter and the wave height speed circuit breaker is connected in parallel between the substations to constitute the DC power source of the DC substation.

Electric power and electric power lines are generally divided between adjacent substations and by line.The divided electric line is connected to its positive bus bar at each substation using a dedicated DC high-speed circuit breaker for 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 overhead contact lines.

Figure 2 shows an example of a conventional power supply device, where i indicates AC power? A forward power converter 2 is composed of a thyristor control element that converts DC power into AC power, and a reverse power converter 2 is composed of a thyristor control element that converts DC power into AC power. 3 is a DC bus bar, 4m, 4b, 4c.

4d, 4., 4f are thyristor circuit breakers for power running (hereinafter referred to as circuit breakers for power running), 5'*5b, 5c, 5d, 5e, 5
f is a regeneration diode. These diodes 5m
@ 5 b * 5 cB 5 d * 5 e e
The anode side of 5 f is m1iFr device for power line 4 a s
4 b # 4 c # Connect to the cathode of 4d, 4@, 4f and connect the diodes 5m, 5b, 5c, 5d,
The cathode equipment of 5s and 5f is connected together and the regenerative thyristor Wi'1fra6C (hereinafter referred to as a regenerative disconnector) is 7.
connected to a node. The cathode of the regenerative circuit breaker 6 is connected to the crossing current bus m3, and the reverse power converter 2 is connected to the zero DC bus 413.
is connected gnr o 8 m, 8 b, 8 a,
8 d, 8*, 8f are [6 [routeki, 9m, 9b, 9a
, 9de9e, 9f are dead sections lla, llb
.

The electric power feeding device shown in Fig. 2 is a so-called double section system that takes measures against section overflow. In other words, even if a ground fault occurs on the electric power line of the Kan-i line, which is divided into sections, arcs will not occur due to the potential difference between the electric trains when the electric car passes through the section. This prevents the section and the battery pack 7 of the electric car from being damaged by the arc.

Next, the operation shown in FIG. 2 will be described. First, electric power for power running of an electric car is generated at a KW station (not shown). The commercial frequency is received from the source bus through an AC circuit breaker (not shown), and the 3-phase AC voltage is converted to an appropriate voltage by a transformer (not shown). Convert it to a voltage of I
It is converted into DC power by I power converter l and divided into 1! The electric cars 12 that are supplied to the electric cars 12 on the single tracks 94, 9b, 9c, 9d, 9*, and 9f are powered by the DC power that is supplied for 5 years as described above. When the t train 12 existing under the track 9e is in regenerative operation, regenerative power is transferred from the train m track 9e to the flow disconnector 8.
, is supplied to the DC bus 3 via the IgJ regenerative diode 5e and the regenerative circuit breaker 6. This mother 831/C supplied f
The L-th generation power is generated by the electric train running the electric car (not shown in the figure), 9m, 9b.

9 a, 9 de 9 f K l! 21, the commercial frequency power source l1IK is connected via the reverse power converter 2.
be regenerated.

Problems to be solved by the D0 invention (1) In the conventional example configured as shown in FIG. Therefore, when the reverse power converter 2 fails in commutation, a fault current is supplied to the forward power converter Ill, causing a problem that the fault is amplified.

(4 In FIG. 2, when the regenerative circuit breaker 6 is shut off, the following problem occurs.

0) During extended power supply, if you try to stop only the desired mirror section, the train on the other adjacent tram track will also be stopped, which will hinder the operation of electric cars. (=) If an attempt is made to interrupt the regenerative current and extended power supply current flowing from the Km line at the time of failure using only the regenerative circuit breaker 6, the circuit breaker 1 of the circuit breaker 6 will not be connected to the power running circuit breakers 4a to 4f. If the number of n;b DC circuits is 6, at least 6 times the power running circuit breaker is required.

f→ Therefore, in order to reduce the already-broken capacity of the regenerative circuit breaker 6,
If the capacity is large enough to cut the regenerative current, in the event of an accident (
2) If the main vehicle is present, it will not be possible to cut off the extended feed ￥twL flow with the mouth cutter 6. Therefore, it is necessary to cut off the flow flowing to the accident point at the adjacent substation, which complicates the eel maintenance sequence in the event of an accident and reduces the reliability of the system.

) As shown above, if 6 is a line, add a line to each DC line! Since the IWr devices 4a to 4f are inserted, the substation becomes very uneconomical.

) Also, as the substation equipment becomes larger, the equipment cost for construction will increase enormously.

Means for Solving the E0 Problem This invention converts AC power into DC power! i! for the power converter and regeneration busbar. 5! A bidirectional power converter that converts DC power into AC power or AC power into DC power, a forward power converter connected to the forward power converter, and a cathode device commonly connected to the forward power IWK. 2M connected
O diode bridge circuit and these 21j1 diode bridge circuits are provided separately, and this is also a common connection of the bridge circuit, and two sets connected to the anode side and the cathode side connected to the power running bus bar. The circuit breaker and the cathodes and anodes of the diodes constituting each side of the two sets of diode bridge circuits are connected separately to a common connection point, and are separated by a dead section forming a double line. 1st, 2nd and 3rd. 4th train track, and these 1st. A dead section is provided between the two railway lines and the second electric train line, and the third electric train line is separated from the two railway lines by a dead section. A 5th electric conductor is provided between the 4th overhead contact line and the 5th overhead contact line, and is separated from both lines by an expanded dead section, and is separately connected to the commonly connected anode side of the two sets of diode bridge circuits. The sixth electric train line and the two sets of diode bridge circuits are commonly connected, and each of the anodes is connected separately to the anode side, and the cathodes are collectively connected to the regeneration bus.
A first stopper diode of the set, and a second stopper diode connected between the power running bus bar and the regeneration bus bar.

20 functions @Flow feed with forward power converter, bidirectional power converter and double sectioned rL9 multiple tram tracks as above! In the device, 2 ffi (0M
When only the power is cut off in the disconnector and only the desired energized section is mirror-stopped, the external power circuit breaker is in the conductive state, so
It is possible to continue the long-term power supply to the train line of the disconnection device. Also,
Since each diode bridge circuit of 2A11 is equipped with a circuit breaker and a stopper diode, even if a ground fault occurs on the side of the electric train line connected to the -power bridge circuit, the circuit breaker of the own bridge circuit can be used at the time of the accident. If 1 is cut off, no current will flow from the bridge circuit side 2>- of the healthy line to the fault point. Furthermore, by inserting a diode in the electrical path connecting the forward power converter and the bidirectional power converter, even if commutation fails during reverse power conversion operation of the bidirectional power converter, the diode can be used to prevent power conversion. It is possible to block the fault current flowing from the device. By making a bidirectional power converter into a forward power converter and supplying power running power to the power running bus, the capacity of the forward power converter can be reduced and the forward power can be compensated even in the event of a failure of the power converter. This eliminates the need for power outages at substations.

G. Embodiment FIG. 1 This is a circuit diagram showing an embodiment of the present invention, and the same parts as in FIG. 2 will be described with the same reference numerals.

In FIG. 1, 21 and 41 are four diodes 22&~22d and 42&~ arranged Vζ as shown in the polarity.
42d to #l are first and second diode bridge circuits. This first and second diode bridge 1
The cathode sides of the diodes 22m, 22a and 42m, 4.2c in paths 21 and 41 are connected to the power bank @3. 23 and 43 twist 1st and 2nd 1irista! ! A disconnector (this circuit breaker company's DC high-speed disconnector may also be used),
And the 7th node side of the second t-Iristor disconnectors 23 and 43 is the power running bus 3, that is, the diode 22a.

The cathodes of 22e, 42m, and 42c are commonly connected and connected to the runners-up 24 and 44. In addition, the diode 22 is connected to the canode side of the first and second t-iris transistors 23 and 430.
The anodes of b, 22d and 42b, 42d are connected to commonly connected points 25 and 45.

The first and second diode bridge circuits 21 and 41
The common connection points 26 and 46 of the diodes 22s1 and 22b and 42m and 42b are connected to the first and third overhead contact lines 9a and 9d4C via flow disconnectors 8a and 8d.
Furthermore, the diodes 22e and 22d and 42c and 42d of the first and second diode bridge circuits 21 and 41
The common connection points 27 and 47 of are connected to the second and m 4 tJLILm paths 9b and 9e via DC disconnectors 8b and 8. Furthermore, the common connection points 54 and 64 of the diodes 22b and 22d and 42b and 42d are connected to the fifth and 611th . Connects to lanes 9C and 9F.

28 and 48 are stopper diodes, and the anode sides of these diodes 2B and 48 are connected to the respective common connection points 25 and 45, and their cathode sides are connected together. Connected to a29.

A bidirectional power converter 34 for converting direct current to alternating current or alternating current to direct current is installed on this n main bus 29.

Continued. A collective connection point 35 on the cathode side of the diodes 2B and 48 is connected to the power running bus 3 via a diode 32 having the illustrated polarity. Note that although the forward power converter 1 is a diode GL current regulator, it may be a thyristor rectifier.

Next, the operation of the above actual winding example will be described.

When the thyristor disconnectors 23 and 43 are normally closed, the powering current of the forward power converter l is
．． 43 → diode 22b, 42b → DC disconnector 8m,
8d to the first, g3 [lanes 9m, 9d, and the second via the thyristor disconnector 23.43 → diode 22d, 42d → DC disconnector 8b, 8*
．． The fourth is supplied to the lanes 9b, 9, and the fifth
, fL is supplied to the sixth electric train tracks 9a, 9f.

For example, the regenerative current generated in the first electric train track 9a is transferred from the DC disconnector 81 to the diode 22m to the $filister IIm.
23 → diode 22d-4 is supplied to the second ml and ai path 9b via the DC disconnector 8b, or the DC disconnector 8
1 → Diode 22m-+f Iristor title Wr device 23 → @
The flow disconnector 8c is turned off to supply 5 dragon armpits 9c4C, or the ilI flow disconnector 8a → diode 22 & → power running bus 3 → thyristor circuit breaker 43 → diode 42b is connected to 42d4 DC disconnector 3rd or 4th'# via 84 or 8e
Is it supplied to the L lanes 9d and 9? @flow @ roadway 8a→
Diode 22a → Power running mother #j3 → Thyristor aIF
r device 43 → @ Valve the flow disconnector 8f and switch to the 6th cage lane 9f
, or DC disconnector 8a → diode 22a → thyristor a disconnector 23 or power bank 113
．． Thyristor circuit breaker 43 → stopper diode 28.4
8 to the lifetime mother IIM 29. In addition, the second @3. No. 41114118% 9 b, 9 d
, 9 @K Similarly, the regeneration that occurred is also carried out in the 1st. The current is supplied to the &n1 valley train line or the mineral roundworm mother I1I29 through the second diode bridge circuit 21.41. When the current is also supplied to the turtle single Iw paths 9a to 9f as described above, 2 The first of the group. Since this can be done by simply inserting the second thyristor circuit breaker 23, 43, there is an advantage that four sets of expensive thyristor circuit breakers (as shown in FIG. 2) can be omitted. cn] enables the production of power supply devices at low cost. Also, when controlling the raw current generated on each electric train line 9a to 9f, the first. 2nd v Irista breaker 23.
43 and the first and second diode bridge circuits 21.41's diode 22 m -= 22 (l and 42 a
~42 Controlled with only d and stopper diode 28.48
This has the advantage of eliminating the need for a regenerative circuit breaker.

Roughly speaking, both the power current and the regenerative current are the first. Since the current will pass through the second breaker 23.43, opening that breaker 23.43 is necessary to open the circuit breaker 23.43. This can simplify the security fraud sequence. By using the CYRIS-P circuit breaker which has the function of interrupting both the power current and the regenerative current), for example, 1t in FIG.
When a ground fault occurs at point 910F of the lane, the SIRISK circuit breaker 23 is opened and the na'ζ powering current is cut off. After that, if the DC disconnector 8a is opened and the Iristor circuit breaker 23 is closed again, even if the regenerative electric car 12 is running on the second overhead contact line 9b, the regenerative current will flow to the regenerative bus 29 as described above. It is also supplied to the 3rd to 6th contact lines 9e to 9f. The second diode bridge circuit 2'', 41 is connected to W! via the stopper diode 28.48. In order for the first thyristor circuit breaker 2 to be opened, the fault current will not flow through the second thyristor circuit breaker 43, and furthermore, the fault current will not flow through the second thyristor circuit breaker 43 during forward conversion operation of the bidirectional power converter. The electric current does not flow towards the accident point, so the spread of the accident can be prevented.

Above 1. The second diode bridge circuit 21°41 and the first diode bridge circuit 21°41. During extended power supply using the second thyristor circuit breaker 23.43, the desired mirror section (9 m
, 9b, 9a), the first ? Since it is only necessary to open the Irista strainer 23, the third step. 4th. Extended power supply can be continued to the mirror-shaped sections of the 6th single track 9d, 9@, and 9f, allowing smooth operation of 'WIt@ vehicles.

During the above-mentioned extended power supply, an accident occurred, and an accident occurred.1 If there are 23 IL & SAKURU SI risk circuit breakers on the line, it will be shut off at 43, so there is no need to shut off at the adjacent substation that supplies the 11Lt flow for the headmaster. . Therefore, the protection sequence can be further simplified and the impact of accidents can be minimized.
The operating efficiency of electric vehicles can be improved.

In addition to the above, since the diode 32 is inserted between the power running bus 3 and the regeneration amount m29, the bidirectional power converter, 3
4 fails in commutation during the reverse power conversion operation, the diode 32 can prevent current from flowing into the bidirectional power converter 34 side. Thereby, even if there is a commutation failure during the reverse power conversion operation of the bidirectional power converter 34, the expansion of the accident can be prevented. By operating the bidirectional power converter 34 for forward power conversion and supplying power running current, it is possible to reduce the capacity of the head gravity converter IS1, and even in the event of a failure, power can be maintained without causing a power outage to the substation. Can supply line current.

H6 Effects of the Invention As described above, according to this invention, the following effects can be obtained. Extended power supply can be continued to the mirror section on the tramway side, allowing smooth operation of electric cars.

b. 4f. In the event of an accident during long power supply, the extended power supply current is cut off by a quick breaker connected to the fault 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, by further simplifying the safety trowel sequence and minimizing the impact of accidents, we installed an OC and a stopper diode that can improve the operating efficiency of electric vehicles. Even when a ground fault occurs on the roadside, if the circuit breaker on the fault side of the two sets of circuit breakers is shut off, the fault will not flow in from the other power circuit breaker, preventing the accident from spreading. It can be prevented.

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

・Compared to the true example, a regenerative circuit breaker and four sets of power circuit circuit breakers are not required, so the equipment cost is very advantageous. In addition, since the number of circuit breakers is reduced, the protection sequence is simplified and the reliability is improved. Also, since the forward power converter operation of the bidirectional power converter can supply the forward power, forward power conversion is possible. In addition to reducing the power capacity of the converter, even if the original power converter fails, running power can be supplied, so there will be no power outage at the substation.

Even if the train is present on any one of the first to sixth contact lines, the g6 regeneration can be supplied to the power running electric car or regeneration busbar of each contact line. Therefore, regenerated power can be used effectively, and an energy-saving power supply system can be realized.

h. Even if a ground fault occurs on the train tracks during regeneration of the main power generated by an electric car, the fault current and regenerative current can be interrupted by a circuit breaker. Therefore, the accident point can be immediately released, and the impact of the accident can be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a practical example of the present invention, and FIG. 2 is a circuit diagram showing a conventional example. l...Forward power converter, 3...Power running bus, 9m, 9
b+ 9 c, 9 d, 9 @, 9 ・
・From the first #! 611tJKjli Road, 21.41-
...First. Second diode bridge circuit, 23.43-
...First. 2nd y (! jx evening jl cut!, 2g, 32.4
8... Stopper diode, 29-... Regeneration bus bar,
34--Bidirectional power converter. Figure 2 W circuit of Kamto example

Claims (1)

[Claims] (1) a forward power converter that converts AC power to DC power; a bidirectional power converter that is connected to a regeneration bus and converts DC power to AC power or AC power to DC power; and the forward power converter. A power running bus connected to the power running bus, and two sets of diode bridge circuits connected to the cathode side commonly connected to this power running bus. Two sets of circuit breakers are connected between the connected anode side and the cathode side connected to the power running bus, and the cathodes and anodes of the diodes constituting each side of the two sets of diode bridge circuits are commonly connected. The first, second, third and fourth tram tracks are connected to each connection point separately and are separated by dead sections forming a double track. is provided separated by a dead section, and is provided between the third and fourth overhead contact lines separated from both tracks by a dead section, and on the commonly connected anode side of the two sets of diode bridge circuits. The respective anodes are separately connected to the fifth and sixth overhead contact lines, which are connected separately, and the commonly connected anode sides of the two sets of diode bridge circuits, and the cathodes are collectively connected to the regeneration bus bar. be done 2
A DC power supply device comprising: a first stopper diode of the set; and a second stopper diode connected between the power running bus and the regeneration bus.