JPS5832054B2 - DC electric railway power supply device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a power supply method for a DC electric railway that uses a Sirisk rectifier as a DC power source, and in particular promotes contactless construction as much as possible for the entire power supply system configuration including the feeding rate for maintenance. The aim is to provide a new power supply system that eliminates complexity and improves reliability.

As a power supply system for DC electric railways, for example, silicon rectifiers are used as forward power converters, and DC high-speed circuit breakers are used to open the fault section from other healthy buses in the event of an accident. As is well known.

In such power supply systems, the DC high-speed circuit breaker itself is a mechanically based contact mechanism, which makes maintenance complicated and furthermore, the disconnection time required to open the fault section is long. For reasons such as increasing the number of accidents,
Recently, a power supply system using a cyrisk switch has been proposed.

FIG. 1 shows a typical configuration example of this kind of power supply system that promotes contactless technology.

In the figure, A indicates a substation that does not have regenerative capacity, and similarly B
1 shows substations with regenerative capabilities, and these substation groups are arranged as appropriate depending on the length of the line.

Returning to Figure 1, 1 is a commercial frequency three-phase power supply bus that supplies power to each substation, and below this input power supply bus are a group of AC circuit breakers 21 to 21.
2. and transformer groups 31 to 35 are connected, respectively, and 41 to 4
4 is a converter group (
It consists of a Graetz connection of Cyrisk elements with a Cyrisk rectifier (Sirisk rectifier).

Reference numeral 45 is a regeneration inverter for feeding back regenerative power from the electric vehicle to the AC input power supply side, and is constructed by connecting silice elements with Graetz connections in the same way as the converter group described above.

51-5. is a group of disconnectors inserted into the DC output side of the converter and the DC input side of the inverter, and one end of these disconnectors is connected to the DC positive electrode bus G1゜G2 as shown in the figure.
SIO ~ S13, 52o-823 under this DC positive electrode bus
The thyrisk element group shown in and Dlo""D13 and D2
0"D23 are connected in antiparallel to each other, and these circuit breaker groups are functionally equivalent to or superior to conventionally well-known DC high-speed circuit breakers. Consideration has been given to providing this function.

610-613 and 620-6□3 are feeder wires 8. 82
70, 7□ indicates a negative electrode bus bar, one end of which is connected to lines 91 to 9□ as shown, and the other end is connected to the converter side and the inverter side.

Dl and D2 each indicate an electric vehicle.

In the conventional example configured in this way, for example, a cyrisk circuit breaker as shown in the figure is applied as a replacement for a conventionally well-known DC type high-speed circuit breaker, so it is possible to eliminate the complexity of maintenance. Of course, in the event of an accident, the interruption of the accident section can be significantly shortened compared to conventional devices, so the spread of the accident can be prevented, and effective countermeasures can be taken quickly.

Furthermore, as seen in substation B, it may be equipped with a regenerative capability, and for example, regenerated power from an electric car during regenerative operation can be regenerated to the commercial frequency power supply bus 1 side via the regenerative inverter 45. For example, assuming that the regenerative vehicle is the electric vehicle D2, the regenerative power from the electric vehicle D2 is as follows: electric vehicle D2 → feeder line 8□ → disconnector 6□3 of substation B → regeneration stopper diode D23 → It is regenerated to the power supply bus 1 side through the path of DC positive bus C2 → disconnector 55 → inverter 45 → transformer 3 → circuit breaker 25, and electric car D2 → feeder line 8□ → disconnector 623 of substation B → Stopper diode D23 → DC positive electrode bus C2 → Powering cycle circuit breaker 522 (or 820) → Disconnector 622 (or 6□).

) is supplied as power to a vehicle (not shown) below the feeder line 81.

In this way, the regenerated power is regenerated to the commercial frequency power supply bus, and is further supplied to the 4-way vehicles as 2-way power, making it possible to use energy effectively.
If the thyristor rectifier 44 and the inverter 45 are appropriately adjusted using a predetermined method, the potential difference between the dead sections can be made approximately zero, resulting in excellent voltage controllability during steady state.

A problem with such conventional power supply systems, whether in a substation equipped with an inverter or a substation without an inverter, is the line circuit breaker for each DC line connected below the DC positive bus.

In other words, in the event of a ground fault on the feeder line side, the AC line SIRISK circuit breaker prevents the fault current from flowing from the power bus bar side to the fault point side through the SYRISK rectifier, and further flows to the fault point side through the regenerative stopper diode. This circuit breaker is indispensable for interrupting fault currents such as regenerated power from the electric wire side and loop power from the adjacent substation, but as is well known, this Cyrisk circuit breaker Since it is intended to interrupt a very large amount of incoming fault current, the Cyrisk circuit breaker itself is very expensive if it is made up of a stack of multiple Cyrisk elements connected in parallel and includes a protective device.

Moreover, since four sets of expensive thyristor circuit breakers are used in the power supply device shown in FIG. 1, it is clear that the equipment cost per substation will rise significantly.

The present invention was devised in view of this point, and its major feature is that the number of applied line risk circuit breakers in particular is reduced as much as possible and the arrangement of the equipment is simplified. This will be explained in detail based on an embodiment shown in FIG.

In the embodiment shown in FIG. 2, the same parts as in FIG. Instead of inserting a directional SIRISK circuit breaker in each DC circuit under the bus C1, stopper diodes D14 to D17 for the KA direction at the A substation are used instead of the directional SYSRISK circuit breaker at the C substation. Stopper diode group D34 to D for rows D34 to D if available.
37, and in order to connect the DC positive electrode bus C1 and the regenerative bus C3, a regenerative cyrisk circuit breaker sa is installed.
It is at the point where o j 833 is inserted.

In addition, in the event of a ground fault on the feeder line side or a short circuit accident on the DC positive bus bar side, the regeneration cyrisk circuit breakers S3o and S33 are designed to prevent regenerative power from the regenerative vehicle flowing through the regeneration stopper diode group and the adjacent This is to cut off fault currents such as power looping in from substations.

Next, we will talk about substation B. In substation B, two sets of power line circuit breakers S31. The point where S3□ is inserted into the Ka row supply loop, and the point where A
And similar to substation C, regenerative stopper diamond group D
20” D23 cathode side bridge point and DC positive electrode bus C
1 and 835 for regeneration.
It's in the point where the lady did it.

Note that the regenerative cyrisk circuit breaker 835 is used to cut off regenerative power or loop power from the adjacent substation, similar to the cyrisk circuit breakers S3o and S33 at the A and C substations.

To describe the operation of this embodiment configured as described above, during normal operation, the DC power converted by each Cyrisk current generator is supplied to each DC power line divided into lines connected under the DC positive bus C1. , the electric cars D1 and D2 are driven in the same direction. For example, if the electric car D2 is in regenerative operation, the regenerated power from the electric car D2 is as follows: electric car D2→feeder line 8□→
Disconnector 623 of substation B → Regeneration stopper diode D23 → Regeneration Cyrisk circuit breaker S35 → DC positive electrode bus C1 → Power running Cyrisk circuit breaker 531 (or S3□) →
Power running stopper diode D24 D25 (or D26) → Disconnector 620 62, (or 622) route to feeder line 8 □ below power running vehicle D1 or feeder line 8
The power is supplied as power to the vehicle (not shown) shown below 2, for effective use of energy.

If, for some reason, the electric wire 81 causes a road accident near the electric car D1 which is running in the forward direction during steady operation, and the electric car D2 is in regenerative operation at the time of this road accident,
In this embodiment, a predetermined protection operation as shown below is performed to selectively cut off only the faulty line.

That is, when it is detected that a ground fault has occurred in an overcurrent relay (not shown) inserted into a DC circuit consisting of diode D15 and disconnector 61 of substation A connected to the fault point, the fault detection signal is used to detect a ground fault. In the case of A substation, the 41-4□ sirisk rectifier is gate-blocked and the fault current flowing in from the power supply bus 1 side is interrupted by the 2, -2□ AC circuit breaker, thereby causing a total power outage at the A substation. shall be.

On the other hand, at substation B, which is adjacent to the fault point, based on the fault detection signal, the fault current from the commercial frequency power supply bus 1 side, which flows in through the grid rectifiers 43-44, is cut off by the power line circuit breaker S31. At the same time, the regenerative power flowing through the path of the electric car D2 → the disconnector 6□3 of the B substation → the regenerative stopper diode D23 → the regenerative cycle breaker S35, and the C substation Forcibly cuts off the loop power that flows in through the paths of disconnector SaO → feeder line 8, → disconnector 6□1 of substation B → regenerative stopper diode D2 → regenerative cyrisk circuit breaker S35.

Through the series of operations described above, for example, on the A substation side, when the fault current flowing through the disconnector 611 connected to the fault point becomes approximately zero, the disconnector 611 of 61 is opened and the fault line is disconnected. Selectively disconnect only from the healthy line, and disconnect switch 6.
．． Sirisk rectifier 41-4 on the condition that 1 is open.
A desired group of gate signals is applied to 2 to start the forward driving.

On the other hand, at substation B, when the current flowing through 620 disconnectors connected to the fault point becomes almost zero, disconnector 6
□.

By opening the circuit, the faulty line is selectively cut off from other healthy lines, the faulty section is isolated, and the predetermined protection operation is completed.

In addition, in the event of a ground fault on the feeder line side as described above, on the B substation side, as described above, the fault current flowing in from the power bus side can be cut off by the power line circuit breaker S31. In addition to continuing the specified power supply, even in the event of an accident, the regenerated power from the electric car D2,
Electric car D2 → Feeder wire 82 → Disconnector 6□3 of B substation → Stopper diode for regeneration D23 → Silisk breaker for regeneration S35 → Silisk breaker for powering S3□ → Stopper diode for powering D26 (or D2□) → Disconnector 62
2 (or 623), it is supplied as power to a vehicle (not shown) below the healthy feeder line 82 adjacent to the failed feeder line.

Furthermore, at substation B, for example, the fault line disconnector 6
After opening 20, the power running cycle breaker S3□, which has been in the cut-off state until now, is turned on again, and the power running cycle breaker S3 → the power running stopper diode D25 → the disconnecting switch 6□1, Needless to say, the desired power is resupplied to the feeder line 8 in the healthy section adjacent to the accident section.

On the other hand, if a ground fault occurs on the DC positive bus C1 at the B substation side, for example due to overturning, 43-44
Gate-shifts the sirisk rectifier to limit the fault current flowing in from the power supply bus side, and also to
3-24 AC circuit breaker shuts off the B substation, causing a total power outage.
In parallel with this operation, the regenerative power from the regenerative vehicle flows through the regenerative stopper diode group D20''D23 at the regenerative cyrisk circuit breaker 835, and also from the healthy substations A and C adjacent to the failed substation B. After cutting off the built-in power and removing the cause of the fault on the DC positive bus C1, the predetermined power supply is restarted.

As described above, in the power supply system according to this embodiment, A of the same configuration is used.
Whether it is a substation, a substation C, or a substation B, which has a different configuration from these substations, in the event of a ground fault on the feeder line side, or even in the event of a ground fault on the DC positive bus side, the above-mentioned By carrying out a series of predetermined protective actions, the cause of the accident is removed and power is resupplied. For example, in the event of a ground fault on the feeder line, substations A and C will inject fault current into the supply loop. Since the SIRISK circuit breaker that can shut off the power is not inserted, the substation itself must be completely shut down.

On the other hand, at substation B, where two sets of line circuit breakers are inserted, the specified power supply can be continued because the circuit breakers cut off the inflowing fault current. The circuit configuration of substation B is said to be the most desirable form from the standpoint of continuing smooth operation operations.

In this example, a power supply system is shown in which substation B, which has a different configuration from these substations, is placed between substation A and substation C, which have the same configuration. This is to explain mutual operation, and this power supply system may have any substation configuration.In short, this application is intended to explain the ease of protection coordination in the event of an accident, as seen in substation B. ,
From the viewpoints of equipment costs and equipment costs, it can be said that the configuration of the equipment layout example of substation B is the most desirable power supply device.

As described above, the present invention constitutes a power supply device by applying two sets of power line circuit breakers to the power line supply loop, and therefore has various effects as shown below.

■ Compared to conventional devices, the power running cycle risk circuit breaker can be reduced to 1/2, and in the event of an accident on the feeder line side, the power running cycle risk circuit breaker can interrupt the fault current that flows from the power bus side and regeneration loop. Therefore, it is possible to immediately shut down only the faulty line and prevent the spread of the fault.

■ In the event of an accident on the feeder line side, the substation can continue supplying power instead of completely shutting down, so the operational efficiency of the entire power supply system can be greatly improved.

■ The reliability and safety of the entire power supply system can be improved due to the reasons stated in items (■) and (■) above.

■ At the substations, we have taken care to either eliminate the need for expensive circuit breakers or keep the number of circuits to the same as the number of lines on the electric train tracks, making it possible to create a very economical power supply system.

[Brief explanation of the drawing]

FIG. 1 is a specific example of a conventional power feeding system to which a Cyrisk circuit breaker is applied, and FIG. 2 is a specific circuit configuration diagram of a power feeding system showing an embodiment of the present invention. 1 is a commercial frequency power supply bus, 4□~4□ are converters, 71
~73 is a negative electrode busbar, 8 and ~82 are feeder wires, C1-C2 are DC positive electrode busbars, C3 is a regeneration busbar, D1-D2 are electric cars, D□4-D1□, D24-D2□, D34-D37
is the first stopper diode, Dlo""D13 and D20 "" D23 j I) so "' 1e3s
is a second stopper diode, S3, ~832 are SI risk circuit breakers, and S31 and S33 are DC switches.

Claims (1)

[Claims] 1 A dead section is created by a DC circuit consisting of a Sirisk rectifier that converts the AC power input from the commercial frequency power supply bus into DC power and supplies it to the DC positive bus, and a stopper diode for each line and a disconnector. Two pairs of direct current supply circuits are formed by connecting the direct current circuits facing each other in parallel with each other, and these two pairs of direct current supply circuits connect the bridge point on the anode side of the stopper diode for horizontal direction and the direct current. first and second power line circuit breakers each connected between the positive electrode busbars and supplying desired power to the power line supply line side; and disconnection from the line stopper diode in the plurality of DC power lines. A series circuit consisting of a regenerative stopper diode group and a regenerative cyrisk circuit breaker connected between each bridge point with the equipment and the DC positive bus bar to guide power from the feeder line to the DC positive bus bar. A DC electric railway power supply device featuring: