JPS62293906A - Protector for electric rolling stock - Google Patents

Abstract

PURPOSE:To enable power running and regenerative braking operation to be stably performed, by providing one electric rolling stock unit with two collector units. CONSTITUTION:On power running, current is fed to a controller 15, via a rectifier 13 and a breaker 10 from collector shoes 11 on the front side in the advancing direction, and via the breaker 10 from collector shoes 12 on the rear side in the advancing direction, and by this method, a motor 19 is driving-controlled. In this case, the state that no current is fed to both the collector shoes 11, 12 is hardly generated. On regenerative braking, the regenerative power generated by the motor 19 is regenerated from the collector shoes 12 on the rear side to third rails, but is checked at the collector shoes 11 on the front side by the rectifier 13. When the voltage of the collector shoes 11 on the front side is lowered, then the breaker 10 is interrupted by a voltage detector 14, and a dynamic braking circuit consisting of a dynamic braking chopper 17 and a resistance device 16 is worked.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Field of Application] The present invention is capable of running by being powered by a power supply line through a contact type current collector such as a pantograph or current collector shoe, and is also capable of regenerative braking. The present invention relates to a protective device for regenerative braking of an electric vehicle having a function, and more specifically, to a protective device for when a current collector enters a non-electrified area, a power outage, or a disconnection occurs.

[Prior art]

Braking methods for so-called electric vehicles such as trains and electric locomotives include:
A mechanical braking method that mechanically brakes the wheels directly or indirectly, and the consumption of electrical energy generated when the electric motor that is originally intended to rotate the wheels is used as a generator by rotating the wheels. An electric braking method is generally used in which the wheels are braked using resistance caused by the electric brake. The latter type of electric braking has been widely used in recent years as it does not have a negative effect on rails, wheel treads, etc., but among these, dynamic braking, in which electric power generated by an electric motor is converted into heat by a resistance device and released, is It is widely used because all the necessary equipment is mounted on the electric car and the configuration is relatively simple. From the viewpoint of energy conservation, regenerative braking, in which electric power generated by an electric motor is regenerated into a power supply line and used as power for other electric vehicles, has become mainstream in recent years.

However, with regenerative braking, electricity is generated by an electric motor and the pantograph,
There is a drawback that the power regenerated to the feeder line by a current collector such as a current collector shoe will not work effectively unless it is consumed by its own electrical load (generally the power load of another electric vehicle). .

Therefore, it will not work effectively if the current collector enters a power-free area, leaves the line, or has a power outage on the power supply line side.

Furthermore, the power supply line is generally configured to collect current from the 3M strip as a power supply line using a current collector shoe for various reasons, such as at a switching point of a substation, or particularly in a subway line.

For this reason, this is an agreement to electrically divide the station area so that it can be turned off and become a non-electrified area, in order to protect passengers in the event that they fall onto the tracks. A demarcation point is provided. Therefore, regenerative braking does not work effectively when passing through this dividing point or within the power outage section.

For this reason, electric cars that use regenerative braking
Electric cars - Each width unit or fixed formation unit is equipped with two or more current collectors, connected by a high-voltage bus bar, and at least one current collector is always electrically connected. The configuration is such that it is effectively connected to the power supply line. The configuration of such a conventional electric vehicle will be specifically described below with reference to the drawings.

Figure 4 shows, for example, "Electric Car Science No. 1424 and 44
This is a schematic circuit connection diagram showing the power supply method for electric cars for the Teito Rapid Transit Corporation Subway Ginza Line published in No. 1.

In addition, in this Fig. 4, the area surrounded by the broken line is the electric vehicle.
It is a three-car train, with the direction of the white arrow (left side in the figure) as the traveling direction, with the accompanying car TI at the front, the old electric car in the middle, and the accompanying car T2 at the rear.

In the figure, la, lb, 2a, and 2b are current collector shoes as current collectors, and the current collector shoe 1 of the leading accompanying vehicle T1 is
A voltage detection device 14a is connected to a voltage detection device 14a, and a voltage detection device 14b is connected to the power shoe 1b of the trailing accompanying vehicle T2 to detect the voltage of the power supply line (specifically, the third rail, not shown). do. In addition, the current collector shoe 2a of the intermediate electric vehicle weight,
2b are connected to each other by a high voltage bus bar,
2a, 2b Even if either one of the current collector shoes becomes insulated from the power supply line (the current collector shoe separates from the 3gL line or enters the non-current section), the other current collector shoe connects the power supply line. electrical connection can be maintained.

The electric vehicle is equipped with a control device 15c for controlling the drive of the electric motor 19 for driving the wheels, and the control device 15c and the electric motor 19 are connected to both current collector shoes 2a.

It is connected to the bus bar connecting between 2b. The control device 15c installed in this electric vehicle is composed of an armature chopper circuit, an impark device, etc., and has a regenerative braking function.

In addition, 18a, 18b, and 18c are each accompanying vehicle T.
I, the accompanying vehicle T2, and the electric vehicle are grounded to the rail through wheels, grounding brushes, etc. that are the grounding circuits.

In the example shown in Fig. 4, the middle electric vehicle is the old one.
Of course, it is also possible to connect a plurality of electric vehicles such as the electric vehicle old model between the two accompanying vehicles TI and 72, or to connect a plurality of intermediate vehicles in combination with the accompanying vehicle. When connecting a plurality of such intermediate electric vehicles, it is preferable to connect each vehicle with a bus bar.

The operation of a conventional electric vehicle that uses such a power supply method is as follows.

During power running, power is supplied to the control device 15c and the electric motor 19 from the third tA line, which is a power supply line, through the current collecting shoes 2a and 2b of the electric vehicle, and the electric motor 19 is rotationally driven.

In addition, if either of the current collector shoes 2a, 2b enters a non-current area such as a power division point, or a third
Even if the wire is separated from the g1 strip, it is possible to receive power from the other current collector shoe.

Note that if there are a plurality of intermediate electric vehicles connected to each other by high-voltage busbars, the possibility that power supply will be interrupted is reduced even if the non-electrified sections extend over a longer distance.

On the other hand, during braking, the electric motor 19 is operated as a generator by the rotation of the wheels, and the generated power is transferred to the current collecting shoe 2a,
It regenerates from 2b to the third rail. At this time, the voltage detection device 14a connected to the current collector shoe 1a of the leading accompanying car ↑1
The voltage applied to the third rail is detected by
If this voltage drops to a value slightly lower than the predetermined voltage, that is, the voltage normally applied to the third rail (for example, 1500V) (however, excluding instantaneous voltage drops such as simply passing through a power division point), It is determined that this is a power outage on the third rail. In this case, regenerative braking is stopped and switched to mechanical braking (air braking).

In addition, in the example of Fig. 4, if the traveling direction is opposite to the white arrow (the right direction in the figure), the current collector shoe 1b of the accompanying car T2, which is the leading car, is connected to the current collector shoe 1b. The voltage applied to the third rail is detected by the voltage detection device 14b.

In addition, in a configuration where power is supplied from the third rail as a power feed line to a current collector shoe as a current collector, which is often adopted in subways, when a passenger falls from the plant form, the third filt in the station premises In this case, the voltage detection device 14a or 14b on the leading car side detects the (g) voltage of the 3rd line and starts regenerative braking in the same way as in the above case. This prevents electric shock from occurring by stopping the regenerated power from being regenerated to the third rail during a power outage.

[Problem that the invention seeks to solve]

In the conventional configuration as described above, the current collector at the forefront in the forward direction (the current collector shoe 1a or Ib in the example of FIG. 4) must be used for detecting the power supply line voltage.
It cannot be used to power the control device and electric motor, or to power the driving power. On the other hand, in general, if there is a current collector shoe, there is one on each running trolley (in reality, there is one on each side of the running trolley in the direction of travel, but there is one on the feeder line). A certain No. 3!It line is installed only on either the left or right side, so there is only one effective current collector shoe per traveling trolley), that is, two shoes per vehicle, and a pantograph. However, due to the limitations of the push-up blades relative to the overhead wires or the bias against the overhead wires, each group (i.e., only two per vehicle) can be installed near the bogie center of the traveling bogie. Therefore, the above-mentioned configuration shown in FIG. 4 has the problem that it can only be used in long formations of more than a certain number of military vehicles, with high-voltage bus lines running between each military vehicle. In other words, in a small organization with only one vehicle or two wheels, there is no room to equip a current collector for detecting the voltage of the feeder line, and therefore the conventional configuration shown in Figure 4 is difficult to apply. That's what it means.

The present invention was made in view of these circumstances, and
- Even in a small organization such as a vehicle or two-wheeled organization, it is possible to feed running current from at least two or more current collectors during power running, thereby avoiding interruptions in power supply during power running as much as possible; To provide a protection device for an electric vehicle configured to perform regenerative braking while detecting power supply line voltage during regenerative braking, and to stop regenerative braking when a power outage of the power supply line is detected.

In addition, when regenerative braking is stopped, by cutting off the regeneration of regenerative power to the power supply line and switching to dynamic braking, it is possible to continue electrical braking. The purpose is also to provide protective equipment.

[Means for solving problems]

In the present invention, - an electric car is equipped with two current collectors,
During power running, both power construction devices are connected in parallel, and during regenerative braking, the power supply line voltage can be detected by the current collector on the front side in the direction of travel, and the regenerative power is prevented from flowing to the current collector on the front side in the direction of travel. Basically, a configuration is adopted in which both of the above-mentioned current collectors are connected via a reverse current blocking rectifier so that the power is regenerated only from the current collector on the rear side in the direction to the feeder line.

Furthermore, in addition to the above-mentioned configuration, the configuration also includes a interrupter 141'i for interrupting regeneration of regenerative power to the power supply line, and a resistor circuit and a chopper circuit for applying dynamic braking when regenerative braking is interrupted. is also taken.

[Effect]

In the present invention, it is possible to collect current using at least two or more current collectors during power running even in a small formation of two vehicles or two wheels, and when regenerative braking is performed, it is possible to collect current using at least two or more current collectors. By detecting the power supply line voltage with an electric device and regenerating regenerated power to the power supply line using another current collector, it is possible to detect a power outage on the power supply line regardless of the regeneration state of the regenerated power. This detection is reliably performed and regenerative braking is stopped.

Furthermore, when the regenerative braking is stopped, the resistance circuit and the chopper circuit perform regenerative braking to continue the electric braking.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a schematic circuit diagram of an electric vehicle equipped with an electric vehicle protection device according to the present invention.

The configuration shown in FIG. 1 shows the circuit configuration of an electric vehicle, and the direction of the white arrow (left side in the figure) is the traveling direction.

In FIG. 1, reference numeral 11.12 denotes a current collector shoe as a current collector, which is in contact with and electrically connected to the 3rd uL strip as a power supply line. A voltage detection device 14 is connected to the current collector shoe 11 on the front side in the direction of travel, and a control device 15 having a regenerative braking function and a wheel drive device are connected to the current collector shoe 12 on the rear side in the direction of travel via a circuit breaker 10. Electric motor 19 for
A parallel circuit of the resistance device 16 and the dynamic braking chopper 17 is connected. And both g, electric shoe 11.1
The two are connected through a reverse current blocking rectifier 13 that can conduct current only from the father shoe 11 that is forward in the direction of travel to the collector shoe 12 that is on the rear side in the direction of travel.

Note that the above-mentioned voltage detection device 14. Electrical braking chopper 17
1. The control device 15 and the like are grounded through a grounding circuit 18 such as a wheel or a grounding brush. Further, the electric motor 19 is a DC series motor if the control device 5 is an armature chopper, and an induction motor if the control device 15 is an inverter.

Next, the operation of the electric vehicle having the circuit configuration shown in FIG. 1 will be explained.

During power running, the current collector shoe 11 on the front side in the traveling direction passes through the rectifier 13 and the circuit breaker 10, and the current collector shoe 12 on the rear side in the traveling direction passes through the circuit breaker 10 to the control device 15.
Electric power is supplied to the motor 19, and the electric motor 19 is thereby driven and controlled. That is, the art book type shoes 11, 12 are connected in parallel to the control device 15 and the electric motor 19. Therefore, during power running, it is difficult for both of the shoe type shoes 11 and 12 to be separated from the third rail serving as the power supply line, or to be located at a power distribution point or the like and not to be supplied with power.

In addition, when adopting such a configuration, the art book type shoe 11
．． The current supplied from the collector shoe 11 has a shunt ratio determined by the impedance of the collector shoe 11 and the forward voltage of the rectifier 13, but the wiring impedance of the collector shoe 12 should be lower than that of the collector shoe 11 side. Accordingly, it is possible to reduce the power supply current from the current collector shoe 11.

On the other hand, during regenerative braking, the regenerative power generated by the electric motor 19 is regenerated from the rear collector shoe J--12 to the third rail via the circuit breaker 10, but is not transferred to the front collector shoe 11. Since this is blocked by the reverse current blocking rectifier 13, the regenerated power will not be regenerated to the third rail from now on.

By the way, if the rear current collector shoe 12 separates from the third rail during regenerative braking, the regenerative power can be transferred to
i(!III) as well as the current collector shoe 12 as well as the resistance device 16
The regenerated electric power is generated and consumed by the resistor device 16, thereby enabling dynamic braking to be performed and stable braking operation.

Note that the detection of disconnection (electrical separation of the current collector shoe from the third rail) can be performed by connecting the voltage detection device 14' in parallel with the control device 15, as shown by the broken line in FIG. 1, for example.
This can be done by detecting a voltage rise caused by regenerated power when the wire is disconnected.

Furthermore, if the front current collector shoe IJ enters a power outage area during regeneration, the front current collector shoe 11
The voltage detection bag 2f14 connected to detects a drop in the third rail voltage. At this time, the voltage detection device 14 detects that the regenerative braking power is transferred to the collector shoe 1 by the reverse voltage blocking rectifier bag τ13.
1 side, it is possible to reliably detect only the third tlt voltage without being affected by regenerative braking power. In this case, the circuit breaker 10 is cut off, the control device 15 and the electric motor 19 are cut off from both the electric shoes 11 and 112, and the regenerated power from the electric and electric shoes 119 is applied to the third rail via the collector shoe 12. to avoid being At the same time, the dynamic braking chopper 17 is controlled on/off, and the regenerated power from the electric motor 19 is passed through the resistor device 16 to be consumed as heat, thereby effectively performing dynamic braking.

Note that in the above embodiment, the configuration is such that dynamic braking is performed when the current collector shoes 12 separate from the third rail or enter a power outage section, but it is possible to switch to air braking or to perform air braking. Of course, it is also possible to use a configuration in which both the brake and the dynamic braking are used together.

FIG. 2 shows an example of a case where a plurality of electric cars having the above-mentioned configuration and equipped with the electric car protection device of the present invention are connected and organized. In addition, in this FIG. 2, for convenience of explanation, two tF
+, [current collector shoes 11 and 12, two of which are installed on each vehicle, a bus bar connecting between them, and a reverse current blocking rectifier installed therein] only 3 are shown, and these Each vehicle-to-vehicle range is shown surrounded by a broken line.

When forming a formation with two or more wheels as described above, current collector shoes 11.11 to be connected to the voltage detection device 14 are installed at both ends of the formation in the direction of travel, specifically on the running bogies near the driver's cab. position. Then, during power running, all current collection z 11.11. '12.12 The running M flow is powered. In addition, during regenerative braking, the current collectors -11 and 11 located at both ends of the formation are used to detect the third rail voltage when they are at the front end in the direction of movement of the formation. Similar to the explanation for the example.

Although Figure 2 shows an example of a two-car formation, it is also possible to form a formation by connecting three or more similarly configured vehicles.
Furthermore, it is of course possible to connect a plurality of intermediate types configured in the same manner as the intermediate electric vehicle weight shown in FIG. 4 above in the middle of the formation.

FIG. 3 shows a schematic circuit connection diagram when the electrical protection device according to the present invention is applied to a vehicle, that is, when a vehicle having a driver's cab at both ends is operated on its own. Specifically, the configuration shown in FIG. 1 is configured so that it can be switched in both directions.

In this embodiment, both current collector shoes 11a, 1-1b
A voltage detection device 14 and a reverse current blocking rectifier 1, respectively.
Switches 21a and 21b are provided for switching between connecting the circuit breaker 10 and the reverse current blocking rectifier 13 in the forward direction, or connecting the circuit breaker 10 and the reverse current blocking rectifier 13 in the reverse direction.

Both switches 2]a and 21b connect the first terminal 21a1 of the switch 21a connected to the current collector shoe 11a to the anode side terminal of the voltage detection device 14 and the reverse fringe current blocking rectifier 13, and the second terminal 21a2 of the switch 21a connected to the current collector shoe 11a are connected to the cathode side terminals of the circuit breaker 10 and the reverse current blocking rectifier 3, respectively, and the switch 21b is connected to the current collector shoe 11b.
The first terminal 21bl (connected to the current collector shoe 11b when the first terminal 21a1 of the switch 21a is connected to the current collector shoe 11a) is connected to the cathode side of the circuit breaker 10 and the reverse current blocking rectifier 13. The same second terminal 21 is attached to the terminal.
b2 (connected to the current collector shoe 11b when the second terminal 21a2 of the switch 21a is connected to the current collector shoe 11a) is connected to the voltage detection device 14 and the reverse current blocking rectifier 1
These are connected to the anode side terminals of No. 3, respectively.

Therefore, the state shown in FIG. 3 is a case in which the vehicle is traveling in the direction of the white arrow (leftward on the diagram C), and in this case, the nine electric switches 11a on the front side in the direction of travel are connected to the voltage detection device 2.
2) Also, the rear current collector shoe 11b is connected to the fffll control device 15, electric motor 19, etc. via the circuit breaker 10. Therefore, during regenerative braking, the front current collector shoe 11
The third rail voltage is detected at point a, and regenerated power is regenerated to the third rail via the rear current collector shoe 11b.

Conversely, the direction opposite to the direction of the white arrow (toward the right on the diagram)
When proceeding to , both switches 21a and 21b are switched as shown by broken lines in FIG. In this case, the force of the current collecting shoe 11b on the front side in the direction of movement (the voltage detecting device 14 and the control device 15 and the electric motor 19 etc. are overcome via the current collecting shoe 11a/!l' circuit breaker 10 on the rear side). Therefore, during regenerative braking, the third rail voltage is detected by the current collecting shoe 11b on the front side in the forward gusset direction, and the regenerative power is regenerated to the third Wt rail via the current collecting shoe 11a on the rear side. conduct.

It should be noted that it is possible to form a formation by connecting a plurality of vehicles having a cab at both ends as shown in FIG. 3, or to form a formation with a vehicle having the structure shown in FIG. Of course, it is also possible to organize the vehicle with the conventional intermediate electric vehicle shown in FIG.

In addition, each of the above-mentioned embodiments describes an electric car that is supplied with power from the third rail using a collector shoe, which is a configuration mainly used in subways, but it is also applicable to an electric car that is supplied with power from a normal overhead line using a pantograph. Of course, it is also applicable in the same way.

〔effect〕

As described above, according to the present invention, even when an electric vehicle capable of regenerative braking is operated singly or in a small formation of two wheels, at least two current collectors are used during power running. Since power can be supplied by the device, stable driving is possible, and during regenerative braking, the power supply line voltage can be detected after cutting off the most current collector device from the regenerative power, making it possible to detect power outage sections. can be done reliably. If a power outage section is detected during regenerative braking, the regenerative braking is stopped, thereby avoiding situations in which regenerative power is applied to the power outage section and poses a danger to people.

Furthermore, in the second aspect of the invention, since the dynamic braking is configured to be SIMIMed even when the regenerative braking is stopped, unnecessary use of mechanical braking is eliminated.

[Brief explanation of the drawing]

Fig. 1 is a basic circuit connection diagram of an electric car equipped with the electric car protection device according to the present invention, and Fig. 2 shows the arrangement of the current collector when the present invention is applied to a bivalent electric car. Figure 3 is a circuit connection diagram for the state of bus bar conduction and reverse current blocking rectifier, etc.; Figure 3 is a circuit connection diagram when the present invention is applied to an electric car that is operated singly; Figure 4 is a diagram showing conventional regenerative braking. This is an example of a possible electric vehicle circuit connection diagram. 11... Current collector shoe (current collector connected to voltage detection device) lla, llb... Current collector shoe 12
...! ! 5 Electrical Shiny (current collector connected to control device) 13... Reverse current blocking rectifier 14... Voltage detection device 15... Control device 16... Resistance device 17... Dynamic braking chopper 1719 ...Electric motor Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] Two current collectors are provided for each electric vehicle and receive power from the feeder line, and a first current collector connected between these two current collectors is located on the front side in the direction of travel. a reverse current blocking rectifier that allows current to flow only from the current collector toward a second current collector on the rear side in the direction of travel; and a voltage detector connected to the first current collector to detect the voltage of the power supply line. a control device that is connected to the first current collector through the reverse current blocking rectifier and also to the second current collector, and that also controls driving of the electric motor and has a power regenerative braking function. During power running, power is supplied from the first current collector to the control device via the reverse current blocking rectifier, and power is also supplied to the control device from the second current collector, and regeneration is performed. During braking, regenerative power is regenerated to the power supply line via the second current collector while detecting the voltage of the power supply line with the voltage detection device, and when the detected voltage drops below a predetermined value, is a protection device for electric vehicles, characterized in that it is designed to stop regenerative braking. 2. Each electric car is equipped with two current collectors for receiving power from the feeder line, and the first current collector connected between these two current collectors is connected in the direction of travel from the first current collector on the front side in the direction of travel. a reverse current blocking rectifier that allows current to flow only in the direction of the second current collector on the rear side; a voltage detection device that is connected to the first current collector and detects the voltage of the power supply line; and the first The current collector is connected to the reverse current blocking rectifier and the circuit breaker, and the second current collector is connected to the control device via the circuit breaker, and the second current collector is connected in parallel with the control device. a dynamic braking device configured with a resistor circuit and a chopper circuit connected to the circuit breaker, and during power running, the power is transmitted from the first current collector to the control device via the reverse current blocking rectifier. At the same time, power is also supplied from the second current collector to the control device, and during regenerative braking, the voltage of the power supply line is detected by the voltage detection device and the regenerative power is supplied through the second current collector. When the voltage regenerated to the power supply line and detected drops below a predetermined value, the circuit breaker interrupts the connection between the second current collector, the dynamic braking device, and the control device to generate regenerated power. 1. A protection device for an electric vehicle, characterized in that the regeneration to the power supply line is stopped, and the dynamic braking device performs dynamic braking.