JPS626837A - Direct current feeding device - Google Patents

Abstract

PURPOSE:To surely deal with the accident by combining interrupting devices with a diode bridge circuit to which a diode series circuit is connected in parallel with same polarity, and applying power running current and regenerative current against two electric car lines through a pair of the interrupting devices. CONSTITUTION:The cathode sides of diodes 22a, 22c in a diode bridge circuit 21 consisting of four diodes 22a-22c, is connected to a bus bar for power running which is connected to a forward power converter 1. A thyrister interrupting device 23 is connected between a common connecting point 24 to the cathodes of the diodes 22a, 22c and a common connecting point 25 to the anodes of the diodes 22b, 22d. Further, the common connecting points 26, 27 between the diodes 22a, 22b while between the diodes 22c, 22d are respectively connected to first and the second electric car lines 10a, 10b through direct current interrupting devices 9a, 9b. The series circuit 29 of diodes 28a, 28b is connected to above bridge circuit 21 in parallel and the common connecting point 30 to the diodes 28a, 28b is connected to a bus bar for regenerating.

Description

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

B0 Summary of the Invention This invention is a DC electric railway power supply device in which a circuit breaker is combined with a diode pringed circuit in gold and a bridge is used so that the current during power flow and the current during regeneration flow through the same circuit breaker. A series circuit of diodes with the same polarity is connected in parallel to the circuit, and regenerative current flows through the series circuit and the circuit breaker.By doing so, the reliability of the system in the event of an accident on the contact line side or a DC bus fault is greatly improved. In addition to making it possible to improve the power consumption, regenerative current can also be used effectively.

BACKGROUND OF THE INVENTION Conventionally, DC substations installed at appropriate intervals along a railway line are configured with one to several sets of converters. 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.

-1. The overhead contact line is generally divided into adjacent substations and on the track side, and the divided overhead contact line is connected to each positive bus bar 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. 2 shows a conventional power supply device, in which 1 is a forward power conversion device consisting of a thyristor control element that converts AC power into DC power;
Reference numeral 2 denotes an inverse power conversion device consisting of a thyristor control element that converts DC power into AC power. 3 is bus line for power line, 4m
, 4b is a thyristor circuit breaker for row row (hereinafter referred to as a cutter for row row) s5''*δb is a regeneration diode, and the anode side of these diodes 51°5b is a thyristor circuit breaker for row row 4m, 4
connected to the cathode of b and a diode 5m, 5
The cathode side of b is connected all at once and connected to the anode of a regenerative thyristor circuit breaker 6 (hereinafter referred to as a regenerative circuit breaker).The cathode of the regenerative circuit breaker 6 is connected to a regenerative bus 7.For regeneration Bus bar 7 is connected to inverse power converter 2 .

8 is the mother i for power running! A stopper diode 9a is inserted between i14 and the regeneration bus bar 7 as shown in the illustrated polarity.

9b is a DC disconnector; This is the second train track.

Next, the operation shown in FIG. 2 will be described. First, the power for the electric car's line operation is obtained by converting the three-phase AC voltage received through the AC circuit breaker (not shown) from the commercial frequency power bus (not shown) into an appropriate voltage using a transformer (not shown) at the substation. The forward power converter 1 converts the power into direct current power, and the divided first
．． It is supplied to the electric car 12 via the second overhead contact lines 1oa and iob. The electric car 12 is driven by the DC power supplied as described above.

Next, when the electric car 12 is in regenerative operation, regenerative power is supplied from the second overhead contact line 10b to the regenerative bus 7 via the regenerative diode 5b and the regenerative circuit breaker 6t. The regenerated power supplied to this bus 7 is passed through the stopper diode 8 and regenerated to the first electric vehicle (not shown) in operation, or is regenerated to the reverse power converter [2]. It is regenerated to the power bus through the

Flow disconnector 9bt - When opening, disconnect circuit breaker 4
This must be done after opening the regenerative circuit breaker 6, but when there is an electric car 12 on the second overhead contact line 10b undergoing regenerative braking, the regenerative circuit breaker 6 must be opened, otherwise the DC disconnector 9b
-There are problems that cannot be resolved.

(2) In the configuration shown in FIG. 2nd 'KIi, ifM road 10m.

To supply DC power to 10b, use circuit breaker 4&.

There is a problem in that power must be supplied through each 4b separately.

(3) In the case of an accident on the power bus 3 and the regeneration bus 7, the raw power converter fj! The regenerative circuit breaker 6 is opened at the same time as the gate of the thyristor tl is throttled. At this time, Ku-1. If the roundworm circuit breaker 6 is to be provided with the ability to interrupt the regenerative current and extended power supply current flowing in from the second overhead contact lines 10a and 10b, its breaking capacity must be larger than that of the circuit breakers 4m and 4b. No. In other words, the regenerative circuit breaker 6 needs to have at least twice the capacity (for two DC circuits) as the one for the line circuit.In particular, if the breaking capacity of the regenerative circuit breaker 6 is small, it is necessary to supply extended power supply current. It would also be necessary to shut down the adjacent substation, which would cause a total power outage to the electric train tracks in sections that do not require this 9-ft power outage.

(4) In addition to the above, since the current circuit breakers 4m and 4b and the regeneration circuit breaker have different properties and purposes, there is a problem that the control means (protection sequence) becomes extremely complicated.

Means for Solving Problem E1 This invention connects a circuit breaker between the commonly connected cathode side and the anode side of a diode bridge circuit, connects the commonly connected cathode side to a power bus, and creates a dead section. 1st section divided by. The common connection points of the cathodes of the diodes forming each side tm of the diode bridge circuit and the seven nodes are connected to the second electric train line separately, and the series circuits of diodes are connected in parallel with the same polarity as the diode bridge circuit. However, a regenerative bus is connected to the common connection point of the series circuit.

26 Effect When configured as described above, the first effect. There may or may not be only one set of circuit breakers in the circuit that supplies direct R power to the second overhead contact line.
One set of circuit breakers can interrupt the power current, regenerative current, etc., and even in the event of an accident on the power bus, regenerative bus, etc., it is possible to reliably deal with the problem by interrupting the circuit breaker. Also, 1
By using a set of circuit breakers to control the regenerative current, the circuit breakers can be manufactured at extremely low cost, which is economically advantageous.

G. Embodiment FIG. 1 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 is a 4
diodes 22m, 22b, 22e, 22d
This is a diode bridge circuit consisting of. A diode 22a in this diode bridge circuit 21,
The cathode side of 22c is connected to the power running bus bar 8. 23
A company thyristor circuit breaker (a DC high-speed circuit breaker may also be used),
The anode of this thyristor circuit breaker n is the bus line 3. That is, the cathodes of the diodes 22g and 22c are commonly connected and connected to the next point 24, and the cathode of the secondary thyristor circuit breaker n is the diode 22b.

The anodes of 22 d are commonly connected and connected to the runner-up point 25.

A common connection point 26 between diodes 22m and 22b of the diode bridge circuit 21 is connected to the first overhead contact line 10& through a DC disconnector 9ai, and a common connection point n between diodes 22c and 22d of the bridge circuit 21 is connected to the second overhead contact line 10b via a DC disconnector 9b. 29 is a series circuit of diodes 28a and 28bt connected in series, and this series circuit 29 is connected in parallel to the diode bridge circuit 21.

A common connection point 30 between the diodes 28m and 28b is connected to the regeneration bus 7. 31-ke Gyakuden Hair Zhong Electric Power Reward Te"Ai.

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

When the thyristor breaker n is normally closed, the forward current of the forward power converter 1 is transferred to the first overhead contact line 1 via the thyristor breaker O→diode 22b→DC disconnector 9at−.
It is supplied to the second overhead contact line 10b via the thyristor circuit breaker n, the diode 22d, and the DC disconnector 9bt.

In addition, the regenerative current generated in the first train section 10 m is transferred from the DC new circuit switch 9a to the diode 22a to the thyristor circuit breaker n.
→ Diode 22 d → 2nd through DC disconnector 9bt
supplied to the electric train line 10b or diode 2
8bt- is supplied to the regeneration bus bar 7.

Note that the regenerative current generated on the second overhead contact line 10b by the electric car 12 is passed through the DC disconnector 9b → diode 22e → thyristor circuit breaker n → diode 22b → DC disconnector 9
It is supplied to the first overhead contact line 10a through at-, or to the regeneration bus 7 through diode 28bt-.

As mentioned above, the first. When supplying the current to the second overhead contact lines 10a, 10b, one thyristor node disconnector n and the diode 22b of the diode bridge circuit 21.

22 Since it can be controlled only by d, thyristor circuit breaker 2
There is an advantage that one set of 3 can be omitted. This allows the entire power supply device to be manufactured at low cost. Also, 1st. 2nd train track 1
When controlling the regenerative current generated in oa and iob, the same advantages as described above can be obtained because the control can be performed using only the thyristor circuit breaker n, the diodes 22a, 22c, and the diode 28b of the diode bridge circuit 2.

Furthermore, both the current and the regenerative current are connected to the thyristor breaker 2.
Since the thyristor circuit breaker 23 is opened, the threshold current for the first regeneration can be interrupted by one set of thyristor circuit breakers. By using a thyristor breaker having the function of interrupting the threshold current of the first regeneration in this way, for example, when a ground fault occurs at point A of the overhead contact line 10a in FIG. 1, the thyristor breaker 23 If it is opened, the current will be cut off. After that, if the DC disconnector 9& is opened and the thyristor circuit breaker 23 is closed, even if the regenerative electric car 12 is operated on the second train road 10b, the regenerative current will be supplied to the regenerative motherboard fM7 as described above. be done.

In the above embodiment, in the event of an accident on the power supply and regeneration busbars 3.7, by shutting off the thyristor circuit breaker 23, it is possible to prevent the outage from spreading to other substations.

Further, since only one set of thyristor circuit breaker n is required for two electric train lines, there is an advantage that the circuit breaker control device and its handling are simple.

H0 Effects of the Invention As stated above, according to the present invention, a trap is created so that the current during power flow and the current during regeneration flow through the same circuit breaker, and the circuit breaker is combined with a diode bridge circuit, and the bridge A series circuit of diodes with the same polarity is connected in parallel to the circuit, and the power and regenerative currents are passed through one set of circuit breakers to the two electric lines, which eliminates the need for expensive circuit breakers. - There are advantages such as being able to omit one set and simplifying the handling of the circuit breaker protection sequence.

In addition, in the event of an accident on the contact line side or a DC bus (power running 9 regeneration) accident, opening the circuit breaker will prevent the accident from spreading, which has the advantage of significantly improving system reliability. There is. Furthermore, if a ground fault occurs on one side of the train line, just in case you open the DC disconnector that supplies that line after the circuit breaker is opened, and then close the circuit breaker, you can connect the regenerative electric train to the other line. Even if there is, regeneration of regenerative current is possible.

[Brief explanation of drawings]

The drawing is a circuit diagram showing one embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional example. 1...Forward power converter, 2...Reverse power converter, 3...
・Power running bus, 7... Regeneration bus, 9a, 9b...
DC disconnector, 10 a 110 b ・” 1st e 21st EJfL line, 11... Dead section, 21
...Diode bridge circuit, imperial order...thyristor circuit breaker, signal...diode series circuit, 31.-piezoelectric ψ
rirai〃eating σ vessel.

Claims (1)

[Claims] (1) A forward power converter that converts AC power to DC power,
A DC power supply device equipped with a reverse power/forward power converter that converts DC power to AC power or AC power to DC power, comprising: a diode bridge circuit whose commonly connected cathode side is connected to a power running bus; and the diode. A circuit breaker connected between the commonly connected anode side of the bridge circuit and the cathode side connected to the power running bus, and the cathodes and anodes of the diodes constituting each side of the diode bridge circuit are commonly connected. The first and second overhead contact lines, which are separated by dead sections connected to each connection point, are connected in parallel to the diode bridge circuit with the same polarity, and the common connection point between the cathode and the anode is connected to the regeneration bus bar. A DC power supply device comprising a series circuit of connected diodes.