WO2021047089A1

WO2021047089A1 - Ac/dc network side circuit of motor train unit and control method therefor

Info

Publication number: WO2021047089A1
Application number: PCT/CN2019/125039
Authority: WO
Inventors: 周安德; 李丰收; 李西宁; 黄威; 何中建; 孙雨彤
Original assignee: 中车株洲电力机车有限公司
Priority date: 2019-09-09
Filing date: 2019-12-13
Publication date: 2021-03-18

Abstract

Disclosed are an AC/DC network side circuit of a motor train unit and a control method therefor. The AC/DC network side circuit comprises two power supply units, a high-voltage cable (8) and a first high-voltage isolation switch (17); each power supply unit comprises a pantograph (1), a second high-voltage isolation switch (7), an AC/DC detection device (2), an alternating-current vacuum circuit breaker (3), a main transformer (12), a converter (13), a grounding device (16), a first AC/DC conversion switch (104) and a direct-current circuit breaker (6); the pantograph (1) is connected to a traction motor (14) by means of the second high-voltage isolation switch (7), the AC/DC detection device (2), the alternating-current vacuum circuit breaker (3), the main transformer (12) and the converter (13); one end of the first AC/DC conversion switch (104) is connected between the AC/DC detection device (2) and the alternating-current vacuum circuit breaker (3), and the other end thereof is connected to the traction motor (14) by means of the direct-current circuit breaker (6), the main transformer (12) and the converter (13); the two power supply units are connected by means of the high-voltage cable (8); and the first high-voltage isolation switch (17) is arranged on the high-voltage cable (8) between the two power supply units. The AC/DC network side circuit is simple in structure and reliable in control, and may be quickly switched between AC/DC power supply modes.

Description

AC and DC grid side circuit of EMU and its control method

Technical field

The invention particularly relates to an AC and DC grid side circuit of an EMU and a control method thereof.

Background technique

The grid-side power supply system is the key system of the train, and the quality of the main circuit design of the grid-side power supply system is one of the important conditions for the quality of the train. With the development of EMU technology, EMUs that use a single power supply system in the traditional sense, such as AC 25kV power supply or DC 3000V power supply, can only be applied to a single power supply line. For some areas where there is no unified power supply system, such as the European Union, the same country has different power supply systems in different regions. There are also vehicles in a certain country that need to run to other countries, but the power supply systems of different countries may also be inconsistent. Therefore, there is a strong demand for EMU vehicles to adapt to different power supply systems of the bow and network. But at present, there is no relevant case for the main circuit of the EMU adapted to the AC and DC power supply circuit. Although the 201510518959.9 AC-DC conversion control circuit for dual-flow brake trains has announced a conversion circuit for dual-current EMUs, it only focuses on the detection of vehicle AC and DC, but it does not provide for the multi-current power supply main circuit of EMUs. A feasible solution.

Summary of the invention

The purpose of the present invention is to provide a simple structure and reliable control of the AC and DC network side circuit of the EMU and its control method, which is suitable for AC power supply mode and DC power supply, in view of the lack of the main circuit of the multi-stream power supply EMU in the prior art. Mode, and can quickly switch between AC and DC power supply modes.

In order to solve the above technical problems, the present invention first provides an AC and DC grid side circuit of an EMU.

In the first scheme, an EMU AC/DC grid-side circuit is characterized by including two sets of power supply units, high-voltage cables and a normally closed first high-voltage isolating switch;

Each power supply unit includes a pantograph for receiving voltage on the contact line, a normally closed second high-voltage isolating switch, an AC and DC detection device, a normally open AC vacuum circuit breaker, a main transformer, a converter, a grounding device, and a normally open The first AC-DC transfer switch, a normally open DC circuit breaker; among them, the output end of the pantograph passes through the second high-voltage isolating switch, AC/DC detection device, AC vacuum circuit breaker, main transformer, converter, and EMU in turn. The traction motor is connected; one end of the first AC/DC transfer switch is connected between the AC/DC detection device and the AC vacuum circuit breaker, and the other end of the first AC/DC transfer switch passes through the DC circuit breaker, main transformer, converter and EMU in turn The traction motor is connected; the main transformer and the converter are grounded through the grounding device;

The two power supply units are connected by a high-voltage cable, and the connection point between the power supply unit and the high-voltage cable is arranged between the second high-voltage isolating switch and the AC/DC detection device; the first high-voltage isolating switch is arranged on the high-voltage cable between the two power supply units.

In the second scheme, an EMU AC/DC grid-side circuit is characterized by including two sets of power supply units, high-voltage cables and a normally closed third high-voltage isolating switch;

Each power supply unit includes a pantograph for receiving voltage on the contact line, an AC/DC detection device, a normally open AC vacuum circuit breaker, a main transformer, a converter, a grounding device, a normally open second AC/DC transfer switch, and a normally open DC circuit breaker, single-pole double-throw third AC-DC transfer switch; among them, the output end of the pantograph is connected to the traction motor of the EMU through the AC-DC detection device, AC vacuum circuit breaker, main transformer, and converter in turn; One end of the second AC-DC transfer switch is connected between the AC-DC detection device and the AC vacuum circuit breaker, the other end of the second AC-DC transfer switch is connected with one end of the DC circuit breaker, and the other end of the DC circuit breaker passes through the main transformer and the converter in turn The other end of the DC circuit breaker is also connected to the first stationary end of the third AC-DC transfer switch. The second stationary end of the third AC-DC transfer switch is connected to the AC vacuum circuit breaker and the main Between transformers; under normal conditions, the first stationary end of the third AC-DC transfer switch is connected to the moving end of the third AC-DC transfer switch;

Both the main transformer and the converter are grounded through the grounding device;

The two power supply units are connected by a high-voltage cable, the movable end of the third AC/DC switch is connected to the high-voltage cable, and the third high-voltage isolating switch is arranged on the high-voltage cable between the two power supply units.

In the third scheme, an EMU AC and DC grid-side circuit is characterized by two sets of power supply units, AC high voltage cables, DC high voltage cables, normally closed AC high voltage isolating switches, and normally closed DC high voltage isolating switches;

Each power supply unit includes a pantograph for receiving voltage on the contact line, an AC/DC detection device, a normally open AC vacuum circuit breaker, a main transformer, a converter, a grounding device, a normally open fourth AC/DC transfer switch, and a normally open The output end of the pantograph is connected to the traction motor of the EMU through the AC/DC detection device, AC vacuum circuit breaker, main transformer, and converter in turn; one end of the fourth AC/DC switch is connected to the AC Between the DC detection device and the AC vacuum circuit breaker, the other end of the fourth AC/DC transfer switch is connected to the traction motor of the EMU through the DC circuit breaker, the main transformer, and the converter in turn; the main transformer and the converter are both connected through the grounding device Ground

The AC high-voltage cable and the DC high-voltage cable are both located between the two power supply units; the connection point between the power supply unit and the AC high-voltage cable is located between the AC vacuum circuit breaker and the main transformer; the connection point between the power supply unit and the DC high-voltage cable is located at the DC circuit breaker Between the transformer and the main transformer;

The AC high voltage isolating switch is arranged on the AC high voltage cable between the two power supply units; the DC high voltage isolating switch is arranged on the DC high voltage cable between the two power supply units.

Based on the same inventive concept, the present invention also provides a control method for the AC and DC grid side circuit of the EMU.

Regarding the AC/DC grid-side circuit of the EMU in the first scheme, a control method of the AC/DC grid-side circuit of the EMU, when both power supply units are free of failure, includes:

The AC and DC detection device detects the network voltage of the catenary, if it detects that the current catenary voltage is AC, keep the first high voltage isolating switch closed, keep the first AC and DC transfer switches of the two power supply units open, and close the two power supplies The AC vacuum circuit breaker of the unit, the catenary is connected to the main transformer, and the power is supplied by the traction motor in the AC power supply mode; if it is detected that the current catenary network voltage is DC, the first high-voltage isolating switch is kept closed and the two power supply units are maintained The AC vacuum circuit breaker is turned off, and the first AC/DC transfer switch and the DC circuit breaker of the two power supply units are closed at the same time, the contact net is connected to the main transformer, and the power is supplied by the traction motor in the DC power supply mode.

Further, when a pantograph fails, the second high-voltage isolation switch in the corresponding power supply unit is disconnected to isolate the pantograph that has failed, and another power supply unit supplies power to the EMU. The circuit can operate normally.

Further, when equipment other than the pantograph in a certain power supply unit fails, the first high-voltage isolating switch is disconnected to isolate the faulty equipment of the power supply unit that has failed, and the other power supply unit performs the operation on the EMU. powered by. The circuit can run normally for half of the train.

Further, before the AC power supply mode is switched to the DC power supply mode, the AC vacuum circuit breakers of the two power supply units are first disconnected to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle slides to the DC power supply area and maintains the pantograph's rising state , Finally, the AC/DC detection device detects the current catenary network voltage. When it detects that the current catenary network voltage is DC, close the first AC/DC transfer switch and DC circuit breaker of the two power supply units, and switch to DC power supply mode . That is, the switch from AC power supply to DC power supply is completed.

Furthermore, before the DC power supply mode is switched to the AC power supply mode, the DC circuit breakers of the two power supply units are first disconnected to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle taxis to the AC power supply area and maintains the pantograph's rising state. Finally, the AC/DC detection device detects the current catenary voltage. When it detects that the current catenary voltage is AC, the first AC/DC switch of the two power supply units is opened, and the AC vacuum of the two power supply units is closed. Circuit breaker, switch to AC power supply mode. That is, the switch from DC power supply to AC power supply is completed.

Aiming at the AC/DC grid-side circuit of the EMU in the second scheme, a control method for the AC/DC grid-side circuit of the EMU, which is characterized in that when both power supply units have no faults, it includes:

Raise the pantograph of a certain power supply unit, and the AC/DC detection device corresponding to the raised power supply unit detects the network voltage of the catenary;

If it is detected that the current catenary network voltage is AC, keep the third high-voltage isolating switch closed, keep the second AC-DC transfer switches of the two power supply units open, close the AC vacuum circuit breaker of the raised bow power supply unit, and connect the catenary The main transformer of the ascending power supply unit is connected to the traction motor of the ascending power supply unit in AC power supply mode; at the same time, the moving end of the third AC/DC transfer switch of the two power supply units is connected to the second fixed end, The main transformer of the power supply unit is connected to the network, and the power is supplied by the traction motor of the power supply unit in the AC power supply mode;

If it is detected that the current catenary network voltage is DC, keep the third high-voltage isolating switch closed, keep the AC vacuum circuit breakers of the two power supply units open, and keep the moving ends of the two power supply units connected to the first fixed end. The second AC/DC transfer switch and the DC circuit breaker of the raised bow power supply unit are closed, and the catenary is connected to the main transformers of the two power supply units, and power is supplied by the traction motors of the two power supply units in the DC power supply mode.

Further, when a device in a certain power supply unit fails, the third high-voltage isolation switch is disconnected to isolate the faulty device of the failed power supply unit, and another power supply unit supplies power to the EMU. The circuit can run normally for half of the train.

Further, before the AC power supply mode is switched to the DC power supply mode, the AC vacuum circuit breakers of the two power supply units are first disconnected to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle slides to the DC power supply area and maintains the pantograph's rising state , Finally, the AC/DC detection device detects the current catenary network voltage. When it detects that the current catenary network voltage is DC, close the second AC/DC transfer switch and DC circuit breaker of the raised bow power supply unit, and connect the two at the same time. The moving end and the first non-moving end of the third AC-DC conversion switch in the power supply unit are switched to the DC power supply mode. That is, the switch from AC power supply to DC power supply is completed.

Furthermore, before the DC power supply mode is switched to the AC power supply mode, the DC circuit breakers of the two power supply units are first disconnected to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle taxis to the AC power supply area and maintains the pantograph's rising state. Finally, the AC/DC detection device detects the current catenary network voltage. When it is detected that the current catenary network voltage is AC, it disconnects the second AC/DC switch of the two power supply units, and closes the power supply unit in the raised bow. The AC vacuum circuit breaker is connected to the moving end and the second non-moving end of the third AC/DC switch in the two power supply units at the same time to switch to the AC power supply mode. That is, the switch from DC power supply to AC power supply is completed.

Aiming at the AC/DC grid-side circuit of the EMU in the third scheme, a control method for the AC/DC grid-side circuit of the EMU, which is characterized in that when both power supply units are fault-free, it includes:

If it is detected that the current catenary network voltage is AC, keep the AC high-voltage isolation switch closed, keep the fourth AC-DC switch of the two power supply units open, close the AC vacuum circuit breaker of the raised bow power supply unit, and the catenary is connected The main transformer of the raised bow power supply unit is powered by the traction motor of the raised bow power supply unit in the AC power supply mode; at the same time, the catenary is connected to the main transformer of the non-lifted bow power supply unit, and power is supplied through the non-lifted bow in the AC power supply mode. The unit’s traction motor is powered;

If it is detected that the current catenary voltage is DC, keep the DC high-voltage isolating switch closed, keep the AC vacuum circuit breakers of the two power supply units open, and close the fourth AC/DC transfer switch and DC circuit breaker of the raised bow power supply unit at the same time , The catenary is connected to the main transformers of the two power supply units, and power is supplied by the traction motors of the two power supply units in the DC power supply mode.

Further, when a device in a power supply unit fails, the AC high-voltage isolation switch is disconnected to isolate the faulty device of the power supply unit that has failed, and another power supply unit supplies power to the EMU. The circuit can run normally for half of the train.

Further, before the AC power supply mode is switched to the DC power supply mode, the AC vacuum circuit breakers of the two power supply units are first disconnected to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle slides to the DC power supply area and maintains the pantograph's rising state , Finally, the AC/DC detection device detects the current catenary network voltage. When it detects that the current catenary network voltage is DC, close the fourth AC/DC transfer switch and DC circuit breaker of the raised bow power supply unit, and maintain DC high voltage The isolating switch is closed and it switches to DC power supply mode. That is, the switch from AC power supply to DC power supply is completed.

Furthermore, before the DC power supply mode is switched to the AC power supply mode, the DC circuit breakers of the two power supply units are first disconnected to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle taxis to the AC power supply area and maintains the pantograph's rising state. Finally, the AC/DC detection device detects the current catenary network voltage. When it is detected that the current catenary network voltage is AC, it disconnects the fourth AC/DC switch of the two power supply units, and closes the power supply unit in the raised bow. AC vacuum circuit breaker, and keep the AC high voltage isolating switch closed, switch to AC power supply mode. That is, the switch from DC power supply to AC power supply is completed.

Compared with the prior art, the present invention has the following beneficial effects:

First, it can be applied to AC power supply and DC power supply, and the vehicle has a wide range of applications.

Second, it can quickly switch online under different power supply systems, and the vehicle does not need to be modified and added equipment, reducing the maintenance cost of the vehicle.

Third, the two power supply units are designed in a symmetrical structure. When a power supply unit fails, it can be cut off and isolated online, and the vehicle can continue to run, avoiding the removal of passengers and improving the on-time rate of the vehicle.

Fourth, the AC and DC shared bus, reducing the wiring of the vehicle; or, the AC power supply line and the DC power supply line are controlled separately, and the circuit redundancy is high.

Fifth, the AC and DC detection devices of the two power supply units detect the voltage of the pantograph network at the same time, which improves the reliability of detection, reduces misoperation, and ensures the safe operation of the circuit.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of the AC and DC grid side circuit according to the first embodiment of the present invention.

Figure 2 is a flow diagram of AC power supply voltage in the first embodiment.

Fig. 3 is a flow diagram of the DC power supply voltage in the first embodiment.

Fig. 4 is a process diagram of switching from an AC power supply mode to a DC power supply mode in the first embodiment.

FIG. 5 is a schematic diagram of the structure of the AC and DC grid side circuit according to the second embodiment of the present invention.

Fig. 6 is a flow diagram of AC power supply voltage in the second embodiment.

Fig. 7 is a flow diagram of the DC power supply voltage in the second embodiment.

Fig. 8 is a process diagram of switching from an AC power supply mode to a DC power supply mode in the second embodiment.

FIG. 9 is a schematic diagram of the circuit structure of the AC and DC grid side of the third embodiment of the present invention.

Fig. 10 is a flow diagram of AC power supply voltage in the third embodiment.

Fig. 11 is a flow diagram of the DC power supply voltage in the third embodiment.

Fig. 12 is a process diagram of switching from an AC power supply mode to a DC power supply mode in the third embodiment.

Among them, 0-contact net, 1-pantograph, 2-AC/DC detection device, 3-AC vacuum circuit breaker, 31-grounding switch, 104-first AC/DC transfer switch, 204-second AC/DC transfer switch, 51-first arrester, 52-second arrester, 53-third arrester, 6-DC circuit breaker (with high-voltage box), 7-second high-voltage isolating switch, 8-high-voltage cable, 9-shop jumper, 10- Voltage transformer, 11-first current transformer, 12-main transformer, 13-converter, 14-traction motor, 15-second current transformer, 16-grounding device, 17-first high voltage isolation switch, 2017 -The third high-voltage isolation switch, 18-the third AC-DC transfer switch, 304-the fourth AC-DC transfer switch, 308-AC high-voltage cable, 309-AC workshop jumper, 3017-AC high-voltage isolation switch, 19-DC high-voltage isolation Switch, 20-DC high-voltage cable, 21-DC workshop jumper.

detailed description

In order to make the above-mentioned technical problems solved, the content of the invention, and the effect of the invention more obvious and easy to understand, the following describes the invention in further detail with reference to the drawings and embodiments.

Example one

As shown in Figure 1, the AC and DC grid-side circuit of the EMU includes two sets of symmetrically arranged power supply units, high-voltage cables 8 and a first high-voltage isolating switch 17 that is normally closed;

Each power supply unit includes a pantograph for receiving the voltage on the catenary 0, a normally closed second high-voltage isolating switch 7, an AC and DC detection device 2, a normally open AC vacuum circuit breaker 3, a main transformer 12, and a converter 13. Grounding device 16, normally open first AC/DC transfer switch 104, normally open DC circuit breaker 6; among them, the output end of pantograph 1 passes through the second high voltage isolating switch 7, AC/DC detection device 2, AC The vacuum circuit breaker 3, the main transformer 12, and the converter 13 are connected to the traction motor 14 of the EMU; one end of the first AC/DC transfer switch 104 is connected between the AC/DC detection device 2 and the AC vacuum circuit breaker 3. The other end of the DC transfer switch 104 is connected to the traction motor 14 of the EMU through the DC circuit breaker 6, the main transformer 12, and the converter 13 in turn; the main transformer 12 and the converter 13 are both grounded through the grounding device 16; the main transformer 12 and The converter 13 is suitable for AC and DC power supply input.

The two power supply units are connected by a high-voltage cable 8. The connection point between the power supply unit and the high-voltage cable 8 is set between the second high-voltage isolating switch 7 and the AC/DC detection device 2; the first high-voltage isolating switch 17 is set at the high-voltage between the two power supply units. Cable 8.

The AC vacuum circuit breaker 3 is grounded through a grounding switch 31.

The AC and DC grid-side circuit of the EMU also includes a workshop jumper 9 arranged on the high-voltage cable 8 between the two power supply units. The high-voltage cable 8 and the workshop jumper 9 are shared by AC and DC.

The AC and DC grid-side circuit of the EMU also includes a voltage transformer 10 between the AC and DC detection device 2 and the AC vacuum circuit breaker 3, and a first current transformer 11 between the AC vacuum circuit breaker 3 and the main transformer 12 , A second current transformer 15 provided between the main transformer 12 and the grounding device 16.

The AC-DC grid-side circuit of the EMU also includes a first lightning arrester 51 arranged between the second high-voltage isolating switch 7 and the AC-DC detection device 2, and a second arrester 51 arranged between the first AC-DC transfer switch 104 and the DC circuit breaker 6. The arrester 52 is a third arrester 53 provided between the AC vacuum circuit breaker 3 and the main transformer 12.

The main components of the AC power supply loop include: catenary 0, pantograph 1, AC and DC detection device 2, AC vacuum circuit breaker 3, grounding switch 31, second high-voltage isolating switch 7, high-voltage cable 8, workshop jumper 9, main Transformer 12, converter 13, traction motor 14, grounding device 16, first high-voltage isolation switch 17.

The main components of the DC power supply circuit include: catenary 0, pantograph 1, AC/DC detection device 2, first AC/DC transfer switch 104, DC circuit breaker 6 (with high-voltage box), second high-voltage isolation switch 7, high-voltage cable 8. Workshop jumper 9, main transformer 12, converter 13, traction motor 14, second current transformer 15, grounding device 16, first high voltage isolation switch 17.

The basic functions of each component in the AC and DC grid-side circuit of the EMU are described as follows:

Pantograph 1-used to receive the voltage on the catenary 0;

The second high-voltage isolation switch 7-used to cut off and isolate the pantograph 1;

AC/DC detection device 2-used to detect the voltage system of the bow net after the bow is raised, and output the corresponding results to the vehicle control unit;

AC vacuum circuit breaker 3 and grounding switch 31-used to connect and disconnect the AC circuit and protect the entire circuit;

The first AC-DC transfer switch 104-used for switching, conducting and disconnecting the AC-DC circuit;

DC circuit breaker 6-used to connect and disconnect the DC circuit, and protect the entire circuit (complete with high-voltage box);

The first high-voltage isolating switch 17-used to switch on and off the AC and DC circuits;

Main transformer 12, converter 13, traction motor 14-used to receive AC and DC voltage, output the corresponding voltage through rectification and inverter, and control the action of traction motor 14 to achieve the functions of traction and braking of the vehicle;

Other components such as lightning arresters and various transformers are components of other protection and control functions of this circuit, and are auxiliary equipment of this circuit.

The invention is suitable for AC and DC contactors 0, and is suitable for AC 25kV, 15kV, 16.7Hz, DC 3000V, DC 1500V pantograph network power supply system. It can automatically detect the power supply system of the bow network, and switch between AC and DC power supply modes online. The AC and DC detection devices of the two power supply units simultaneously detect the grid voltage, and when the detection results of the two are consistent, the subsequent AC and DC working mode operations are entered.

When the present invention works normally, the single bow will supply power to the whole vehicle.

The working principle of the present invention: the pantograph 1 of the left power supply unit in FIG. 1 is raised, and the AC and DC detection device 2 judges the AC and DC network voltage of the catenary 0. If it is detected that the current grid voltage is AC power supply (such as AC 25kV or 15kV), it means that the vehicle is in AC power supply mode, the first high-voltage isolation switch 17 remains closed, and the first AC-DC transfer switches 104 of the two power supply units remain stationary and closed at the same time The AC vacuum circuit breaker 3 of the two power supply units is connected to the main transformer 12 to complete the power supply in the AC power supply mode. If it is detected that the current grid voltage is DC power supply (such as DC 3000V or 1500V), it means that the whole vehicle is in DC power supply mode, the first high-voltage isolation switch 17 remains closed, and the first AC-DC transfer switches 104 of the two power supply units switch from grounding to DC When the AC vacuum circuit breaker 3 remains open, the DC circuit breaker 6 is closed, and the main transformer 12 is switched on to complete power supply in the DC power supply mode.

Description of fault isolation operation: Whether the circuit of the present invention is in the AC power supply mode or the DC power supply mode, the fault isolation operation method is the same, and the description is only given in the AC power supply mode as an example.

When the vehicle is in the state of falling bow and no electricity:

If the pantograph 1 of a power supply unit fails, the second high-voltage isolation switch 7 is disconnected to isolate the faulty pantograph 1. Raise the bow of another normal power supply unit to supply power to the entire vehicle equipment to ensure the normal operation of the vehicle.

If a certain power supply unit equipment (such as transformer 12, converter 13, etc.) fails, after disconnecting the first high-voltage isolation switch 17, raise the bow of another normal power supply unit to supply power to the other power supply unit to ensure that the vehicle can be half train run.

When the vehicle is in a live-bow state (if the pantograph 1 of the left power supply unit in Figure 1 is raised, power is supplied to the equipment of the left power supply unit and the right power supply unit):

If the pantograph 1 of the right power supply unit fails, you can directly disconnect the second high-voltage isolation switch 7 of the right power supply unit to isolate the faulty pantograph 1 and keep the vehicle running; if the right power supply unit except the pantograph If the equipment outside 1 (such as transformer 12, converter 13, etc.) fails, disconnect the first high-voltage isolation switch 17 to isolate the faulty power supply unit on the right to ensure the normal operation of the power supply unit on the left;

If the pantograph 1 of the left power supply unit fails, the AC vacuum circuit breakers 3 of the two power supply units are disconnected, and the second high-voltage isolating switch 7 of the left power supply unit is disconnected to isolate the faulty pantograph 1 on the left, and the right power supply The pantograph 1 of the unit, the AC vacuum circuit breaker 3 of the two power supply units are closed, and the main transformer 12 is connected, so that the vehicle can run normally as a whole train.

If the equipment (such as transformer 12, converter 13, etc.) of the left power supply unit other than the pantograph 1 fails, disconnect the AC vacuum circuit breaker 3 of the left power supply unit to isolate the faulty equipment of the left power supply unit. The first high-voltage isolation switch 17 is kept in a closed state to supply power to the normal power supply unit on the right side to ensure that the vehicle can run in a half train.

The method for controlling the AC and DC grid-side circuit of the EMU of the present invention includes: when two power supply units are not faulty,

The AC/DC detection device 2 detects the network voltage of the catenary 0, and if it detects that the current network voltage of the catenary 0 is AC, the first high-voltage isolating switch 17 is kept closed, and the first AC-DC conversion switches 104 of the two power supply units are kept open , Close the AC vacuum circuit breakers 3 of the two power supply units, the catenary 0 is connected to the main transformer 12, and power is supplied by the traction motor 14 in the AC power supply mode; if it is detected that the current catenary 0 grid voltage is DC, the first high voltage is maintained The isolating switch 17 is closed to keep the AC vacuum circuit breakers 3 of the two power supply units open. At the same time, the first AC and DC transfer switches 104 and the DC circuit breaker 6 of the two power supply units are closed. In the power supply mode, power is supplied through the traction motor 14.

When a pantograph 1 fails, the second high-voltage isolation switch 7 in the corresponding power supply unit is disconnected to isolate the pantograph 1 that has failed, and another power supply unit supplies power to the EMU. The circuit can operate normally.

When equipment other than the pantograph 1 in a power supply unit fails, the first high-voltage isolation switch 17 is disconnected to isolate the faulty equipment of the power supply unit that has failed, and another power supply unit supplies power to the EMU. . The circuit can run normally for half of the train.

Description of AC/DC power supply switching:

Switch from AC power supply mode to DC power supply mode: When the vehicle is operating normally in AC mode, before entering DC power supply mode, first disconnect the AC vacuum circuit breakers 3 of the two power supply units to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle coasts Go to the DC power supply area and maintain the ascending state of the pantograph 1, and finally the AC/DC detection device 2 detects the current catenary 0 grid voltage. When it detects that the current catenary 0 grid voltage is DC, close the two power supply units The first AC/DC transfer switch 104 and the DC circuit breaker 6 are switched to the DC power supply mode. That is, the switch from AC power supply to DC power supply is completed.

Switch from DC power supply mode to AC power supply mode: When the vehicle is running normally in DC mode, before entering AC power supply mode, first disconnect the DC circuit breakers 6 of the two power supply units to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle taxis to AC power supply area and maintain the ascending state of the pantograph 1, and finally the AC/DC detection device 2 detects the current catenary 0 grid voltage, and when it detects that the current catenary 0 grid voltage is AC, disconnect the two power supply units The first AC-DC transfer switch 104 is closed, and the AC vacuum circuit breakers 3 of the two power supply units are closed to switch to the AC power supply mode. That is, the switch from DC power supply to AC power supply is completed.

Figure 2 shows the voltage flow diagram in AC power supply mode. Raise the pantograph 1 of the left power supply unit, and the AC/DC detection device 2 judges the AC/DC network voltage of the catenary 0. If it is detected that the current grid voltage is AC power supply (such as AC 25kV or 15kV), the first high-voltage isolation switch 17 remains closed, the first AC-DC transfer switch 104 remains stationary (the default is the grounding position), and the AC vacuum of the two power supply units is closed at the same time The circuit breaker 3 turns on the main transformer 12 to complete the power supply in the AC power supply mode.

When a failure occurs in AC power supply mode: upgrade the power supply unit bow, if the pantograph 1 of another power supply unit fails, directly cut off the second high-voltage isolation switch 7 of the other power supply unit to isolate the faulty pantograph 1, and the whole vehicle can still be used The whole vehicle is running; if the equipment of another power supply unit other than the pantograph 1 fails, the first high-voltage isolating switch 17 can be disconnected, the faulty power supply unit is cut off, and the train runs halfway; if the power supply unit except the pantograph 1 If equipment (such as transformer 12, converter 13, etc.) is faulty, directly disconnect the AC vacuum circuit breaker 3 of the power supply unit to isolate the faulty equipment. If the pantograph 1 of the power supply unit fails, the second high-voltage isolation switch 7 is used to isolate the faulty pantograph 1, and then a lift operation is required. The bow of another power supply unit is raised to supply power to the entire vehicle unit, and the vehicle can keep the entire vehicle running .

Figure 3 shows the voltage flow diagram in DC power supply mode. Raise the pantograph 1 of the left power supply unit, and the AC/DC detection device 2 judges the AC/DC network voltage of the catenary 0. If it is detected that the current grid voltage is DC power supply (such as DC 3000V or 1500V), keep the first high-voltage isolating switch 17 closed, the first AC-DC transfer switch 104 of the two power supply units will switch from the ground position to the DC position, and the AC vacuum circuit breaker 3 will remain The disconnected state remains unchanged, the DC circuit breaker 6 is closed, and the main transformer 12 is connected to complete the power supply in the DC power supply mode.

When a failure occurs in the DC power supply mode: If the pantograph 1 of another power supply unit fails, directly cut off the second high-voltage isolation switch 7 of the other power supply unit to isolate the faulty pantograph 1, and the whole vehicle can still be used. The whole vehicle is running; if the equipment of another power supply unit other than the pantograph 1 fails, the first high-voltage isolating switch 17 can be disconnected, the faulty power supply unit is cut off, and the train runs halfway; if the power supply unit except the pantograph 1 If equipment (such as transformer 12, converter 13, etc.) is faulty, directly disconnect the DC circuit breaker 6 of the power supply unit to isolate the faulty equipment. If the pantograph 1 of the power supply unit fails, the second high-voltage isolation switch 7 is used to isolate the faulty pantograph 1, and then a lift operation is required. The bow of another power supply unit is raised to supply power to the entire vehicle unit, and the vehicle can keep the entire vehicle running .

Figure 4 shows a schematic diagram of the process of switching from AC power supply mode to DC power supply mode. When the vehicle is operating normally in AC power supply mode, the vehicle is in AC power supply mode. Before entering DC power supply mode (AC/DC conversion no-power zone), the vehicle needs to cut off the power supply of two units of AC vacuum circuit breakers 3 to ensure that the vehicle is in a bowless network. Power supply state, the vehicle taxis to the DC power supply area, the pantograph 1 keeps the bow ascending state, and the AC/DC detection device 2 detects the current state of the bow network to ensure that when DC power is supplied, the first AC/DC conversion switch 104 of the two power supply units Switch from the ground position to the DC position, and close the DC circuit breaker 6 at the same time, switch to the DC power supply mode, that is, complete the switch from AC power supply to DC power supply.

The process of switching from the DC power supply mode to the AC power supply mode is similar, and will not be repeated here, but it does not affect the understanding and implementation of the present invention by those skilled in the art.

Example two

As shown in Figure 5, the AC and DC grid-side circuit of the EMU includes two sets of symmetrically arranged power supply units, high-voltage cables 8 and a third high-voltage isolating switch 2017 that is normally closed;

Each power supply unit includes a pantograph 1, an AC/DC detection device 2, a normally open AC vacuum circuit breaker 3, a main transformer 12, a converter 13, a grounding device 16, and a normally open first The second AC-DC transfer switch 204, the normally open DC circuit breaker 6, the single-pole double-throw third AC-DC transfer switch 18; among them, the output end of the pantograph 1 passes through the AC/DC detection device 2, the AC vacuum circuit breaker 3, The main transformer 12 and the converter 13 are connected to the traction motor 14 of the EMU; one end of the second AC-DC transfer switch 204 is connected between the AC-DC detection device 2 and the AC vacuum circuit breaker 3, and the second AC-DC transfer switch 204 The other end is connected to one end of the DC circuit breaker 6. The other end of the DC circuit breaker 6 is connected to the traction motor 14 of the EMU through the main transformer 12 and the converter 13 in turn. The other end of the DC circuit breaker 6 is also connected to the third AC/DC transfer switch 18. The first stationary end of the third AC-DC transfer switch 18 is connected between the AC vacuum circuit breaker 3 and the main transformer 12; the first stationary end of the third AC-DC transfer switch 18 is normally Terminal is connected to the movable terminal of the third AC/DC switch 18;

Both the main transformer 12 and the converter 13 are grounded through a grounding device 16; the main transformer 12 and the converter 13 are suitable for AC and DC power supply input.

The two power supply units are connected by a high-voltage cable 8, the movable end of the third AC-DC switch 18 is connected to the high-voltage cable 8, and the third high-voltage isolating switch 2017 is provided on the high-voltage cable 8 between the two power supply units. The high-voltage cable 8 and the workshop jumper 9 are shared by AC and DC.

The AC vacuum circuit breaker 3 is grounded through a grounding switch 31.

The AC and DC grid-side circuit of the EMU also includes a workshop jumper 9 arranged on the high-voltage cable 8 between the two power supply units.

The AC/DC grid-side circuit of the EMU also includes a first lightning arrester 51 arranged between the pantograph 1 and the AC/DC detection device 2, and a second lightning arrester 52 arranged between the second AC/DC switch 204 and the DC circuit breaker 6 , A third lightning arrester 53 provided between the AC vacuum circuit breaker 3 and the main transformer 12.

The main components of the AC power supply loop include: catenary 0, pantograph 1, AC/DC detection device 2, AC vacuum circuit breaker 3, grounding switch 31, third AC/DC switch 18, high voltage cable 8, workshop jumper 9, The main transformer 12, the converter 13, the traction motor 14, the grounding device 16, and the third high-voltage isolation switch 2017.

The main components of the DC power supply loop include: catenary 0, pantograph 1, AC/DC detection device 2, second AC/DC transfer switch 204, DC circuit breaker 6 (with high voltage box), third AC/DC transfer switch 18, high voltage Cable 8, workshop jumper 9, main transformer 12, converter 13, traction motor 14, second current transformer 15, grounding device 16, third high voltage isolation switch 2017.

Pantograph 1-used to receive the voltage on the catenary 0;

The second AC-DC conversion switch 204 and the third AC-DC conversion switch 18 are used for switching, conducting and disconnecting AC and DC circuits;

The third high-voltage isolation switch 2017-used to turn on and break AC and DC circuits;

The invention is suitable for AC and DC contactors 0, and is suitable for AC 25kV, 15kV, 16.7Hz, DC 3000V, DC 1500V pantograph network power supply system. It can automatically detect the power supply system of the bow network, and switch between AC and DC power supply modes online.

The working principle of the present invention: the pantograph 1 of the left power supply unit in FIG. 5 is lifted, and the AC/DC detection device 2 judges the AC/DC network voltage of the catenary 0. If it is detected that the current grid voltage is AC power supply (such as AC 25kV or 15kV), it means that the vehicle is in AC power supply mode, the third high-voltage isolation switch 2017 remains closed, and the second AC-DC transfer switches 204 of the two power supply units remain stationary and closed at the same time The AC vacuum circuit breaker 3 in the left power supply unit turns on the main transformer 12 in the left power supply unit to complete the power supply of the left power supply unit. At the same time, the third AC-DC transfer switches 18 of the two power supply units are both set to the AC position (that is, the moving end and the second fixed end are connected), and the main transformer 12 in the right power supply unit is turned on to complete the power supply in the AC power supply mode. . If it is detected that the current grid voltage is DC power supply (such as DC 3000V or 1500V), it means that the whole vehicle is in DC power supply mode, the third high-voltage isolation switch 2017 remains closed, and the second AC-DC transfer switch 204 of the two power supply units is switched from grounding to DC When the AC vacuum circuit breaker 3 of the two power supply units remains open, the DC circuit breaker 6 in the left power supply unit is closed, and the main transformer 12 in the left power supply unit is turned on to complete the power supply of the left power supply unit. At the same time, the third AC-DC transfer switches 18 of the two power supply units are both set to the DC position (that is, the moving end is connected to the first fixed end), and the main transformer 12 in the right power supply unit is switched on to complete the power supply in the DC power supply mode. .

When the vehicle is in the state of falling bow and no electricity:

If a power supply unit fails, the third high-voltage isolation switch 2017 is disconnected to isolate the faulty power supply unit. Raise the bow of another normal power supply unit to supply power to the equipment of the other power supply unit to ensure that the vehicle can run half-train.

When the vehicle is in a live-bow state (if the pantograph 1 of the left power supply unit in Figure 5 is raised, power is supplied to the equipment of the left power supply unit and the right power supply unit):

If the right power supply unit fails, the third high-voltage isolation switch 2017 can be disconnected to isolate the faulty right power supply unit to ensure the normal operation of the left power supply unit.

If the left power supply unit fails, disconnect the AC vacuum circuit breaker 3 of the left power supply unit, lower the pantograph 1 of the left power supply unit, and then disconnect the third high voltage isolating switch 2017 to raise the right power supply unit And close the AC vacuum circuit breaker 3 of the right power supply unit to supply power to the equipment of the right power supply unit to ensure that the vehicle can run half-train.

Raise the pantograph 1 of a certain power supply unit, and the AC/DC detection device 2 corresponding to the raised power supply unit detects the network voltage of the catenary 0;

If it is detected that the current catenary 0 network voltage is AC, the third high-voltage isolating switch 2017 is kept closed, the second AC-DC transfer switch 204 of the two power supply units is kept open, and the AC vacuum circuit breaker 3 of the raised bow power supply unit is closed. , The catenary 0 is connected to the main transformer 12 of the elevated power supply unit, and power is supplied by the traction motor 14 of the elevated power supply unit in the AC power supply mode; at the same time, the moving ends of the third AC/DC transfer switches 18 of the two power supply units are connected to The second stationary end is connected, the catenary 0 is connected to the main transformer 12 of the non-lifting power supply unit, and power is supplied through the traction motor 14 of the non-lifting power supply unit in the AC power supply mode;

If it is detected that the current catenary 0 grid voltage is DC, keep the third high voltage isolating switch 2017 closed, keep the AC vacuum circuit breakers 3 of the two power supply units open, and keep the moving end and the first stationary end of the two power supply units The second AC-DC transfer switch 204 and the DC circuit breaker 6 of the raised bow power supply unit are closed at the same time, and the catenary 0 is connected to the main transformers 12 of the two power supply units. In the DC power supply mode, the traction motors of the two power supply units are passed through 14 power supply.

When a device in a certain power supply unit fails, the third high-voltage isolation switch 2017 is turned off to isolate the faulty device of the failed power supply unit, and another power supply unit supplies power to the EMU. The circuit can run normally for half of the train.

Description of AC/DC power supply switching:

Switch from AC power supply mode to DC power supply mode: When the vehicle is operating normally in AC mode, before entering DC power supply mode, first disconnect the AC vacuum circuit breakers 3 of the two power supply units to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle coasts Go to the DC power supply area and maintain the ascending state of the pantograph 1. Finally, the AC/DC detection device 2 detects the current catenary 0 grid voltage. When it detects that the current catenary 0 grid voltage is DC, close the raised bow power supply The second AC-DC transfer switch 204 and the DC circuit breaker 6 of the unit are simultaneously connected to the moving end and the first non-moving end of the third AC-DC transfer switch 18 of the two power supply units to switch to the DC power supply mode. That is, the switch from AC power supply to DC power supply is completed.

Switch from DC power supply mode to AC power supply mode: When the vehicle is running normally in DC mode, before entering AC power supply mode, first disconnect the DC circuit breakers 6 of the two power supply units to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle taxis to AC power supply area and maintain the ascending state of the pantograph 1, and finally the AC/DC detection device 2 detects the current catenary 0 grid voltage, and when it detects that the current catenary 0 grid voltage is AC, disconnect the two power supply units The second AC/DC transfer switch 204 is closed, and the AC vacuum circuit breaker 3 in the raised bow power supply unit is closed, and the moving end and the second fixed end of the third AC/DC transfer switch 18 in the two power supply units are connected at the same time to switch to AC power supply mode. That is, the switch from DC power supply to AC power supply is completed.

Figure 6 shows the voltage flow diagram in AC power supply mode. Raise the pantograph 1 of the left power supply unit, and the AC/DC detection device 2 judges the AC/DC network voltage of the catenary 0. If it is detected that the current grid voltage is AC power supply (such as AC 25kV or 15kV), the second AC/DC transfer switch 204 remains stationary (the default is the grounding position), closes the AC vacuum circuit breaker 3 of the left power supply unit, and turns on the main transformer 12 Complete the power supply of the left power supply unit. At the same time, the third AC-DC transfer switches 18 of the two power supply units are both set to the AC position (that is, the moving end is connected to the second fixed end), the third high-voltage isolation switch 2017 remains closed, and the main transformer of the right power supply unit is connected. 12. The power supply in AC power supply mode is completed.

When a failure occurs in AC power supply mode: If the power supply unit fails, if another power supply unit fails, you can directly disconnect the third high-voltage isolating switch 2017 to remove the faulty power supply unit and run half of the train; if the power supply unit fails, you need to replace it. Raise operation, raise the pantograph 1 of the non-faulty power supply unit to supply power to the normal unit, and also use the third high-voltage isolation switch 2017 to isolate the faulty unit.

Figure 7 shows the voltage flow diagram in DC power supply mode. Raise the pantograph 1 of the left power supply unit, and the AC/DC detection device 2 judges the AC/DC network voltage of the catenary 0. If it is detected that the current grid voltage is DC power supply (such as DC 3000V or 1500V), the second AC/DC switch 204 of the left power supply unit switches from the ground position to the DC position, and the AC vacuum circuit breakers 3 of the two power supply units remain open. , Close the DC circuit breaker 6 in the left power supply unit, and switch on the main transformer 12 in the left power supply unit to complete the power supply of the power supply unit. At the same time, the third AC-DC transfer switches 18 of the two power supply units are both set to the DC position (that is, the moving end is connected to the first fixed end), the third high-voltage isolating switch 2017 is kept closed, and the main transformer 12 of the right power supply unit is turned on. , The power supply in DC power supply mode is completed.

When a failure occurs in the DC power supply mode: If the power supply unit fails, if another power supply unit fails, you can directly disconnect the third high-voltage isolation switch 2017, cut off the faulty power supply unit, and run half of the train; if the power supply unit fails, it needs to be replaced. In operation, the pantograph 1 of the non-faulty power supply unit is raised to supply power to the normal unit, and the third high-voltage isolation switch 2017 is also used to isolate the faulty unit.

Figure 8 shows a schematic diagram of the process of switching from AC power supply mode to DC power supply mode. When the vehicle is operating normally in AC power supply mode, the vehicle is in AC power supply mode. Before entering DC power supply mode (AC/DC conversion no-power zone), the vehicle needs to cut off the power supply of two units of AC vacuum circuit breakers 3 to ensure that the vehicle is in a bowless network. Power supply status, the vehicle taxis to the DC power supply area, the pantograph 1 maintains the ascending status, and the AC/DC detection device 2 detects the current status of the bow network to ensure that when DC power is supplied, the second AC/DC conversion of the ascended power supply unit The switch 204 is switched from the ground position to the DC position, and at the same time, the DC circuit breaker 6 of the raised bow power supply unit is closed to switch to the DC power supply mode, that is, the switch from AC power supply to DC power supply is completed.

Example three

As shown in Figure 9, the AC and DC grid-side circuit of the EMU includes two sets of symmetrically arranged power supply units, AC high voltage cables 308, DC high voltage cables 20, normally closed AC high voltage isolating switches 3017, and normally closed DC high voltage isolating switches 19;

Each power supply unit includes a pantograph 1, an AC/DC detection device 2, a normally open AC vacuum circuit breaker 3, a main transformer 12, a converter 13, a grounding device 16, and a normally open first Four AC/DC transfer switch 304, normally open DC circuit breaker 6; among them, the output end of the pantograph 1 passes through the AC/DC detection device 2, the AC vacuum circuit breaker 3, the main transformer 12, the converter 13 and the EMU in turn The traction motor 14 is connected; one end of the fourth AC-DC transfer switch 304 is connected between the AC-DC detection device 2 and the AC vacuum circuit breaker 3, and the other end of the fourth AC-DC transfer switch 304 passes through the DC circuit breaker 6, the main transformer 12 in turn The converter 13 is connected to the traction motor 14 of the EMU; the main transformer 12 and the converter 13 are grounded through the grounding device 16; the main transformer 12 and the converter 13 are suitable for AC and DC power supply input.

The AC high-voltage cable 308 and the DC high-voltage cable 20 are both set between the two power supply units; the connection point between the power supply unit and the AC high-voltage cable 308 is set between the AC vacuum circuit breaker 3 and the main transformer 12; The connection point is set between the DC circuit breaker 6 and the main transformer 12;

The AC high voltage isolating switch 3017 is arranged on the AC high voltage cable 308 between the two power supply units; the DC high voltage isolating switch 19 is arranged on the DC high voltage cable 20 between the two power supply units.

The AC vacuum circuit breaker 3 is grounded through a grounding switch 31.

The AC and DC grid-side circuit of the EMU also includes an AC workshop jumper 309 on the AC high voltage cable 308 between the two power supply units, and a DC workshop jumper 21 on the DC high voltage cable 20 between the two power supply units. The AC high voltage cable 308 and the AC workshop jumper 309 are used in the AC power supply mode, and the DC high voltage cable 20 and the DC workshop jumper 21 are used in the DC power supply mode.

The AC/DC grid-side circuit of the EMU also includes a first lightning arrester 51 arranged between the pantograph 1 and the AC/DC detection device 2, and a second lightning arrester 52 arranged between the fourth AC/DC switch 304 and the DC circuit breaker 6 , A third lightning arrester 53 provided between the AC vacuum circuit breaker 3 and the main transformer 12.

The main components of the AC power supply loop include: catenary 0, pantograph 1, AC and DC detection device 2, AC vacuum circuit breaker 3, grounding switch 31, AC high voltage cable 308, AC workshop jumper 309, main transformer 12, converter Device 13, traction motor 14, grounding device 16, AC high voltage isolation switch 3017.

The main components of the DC power supply loop include: catenary 0, pantograph 1, AC/DC detection device 2, fourth AC/DC transfer switch 304, DC circuit breaker 6 (with high voltage box), DC high voltage isolation switch 19, DC high voltage cable 20. DC workshop jumper 21, main transformer 12, converter 13, traction motor 14, second current transformer 15, grounding device 16.

Pantograph 1-used to receive the voltage on the catenary 0;

The fourth AC-DC transfer switch 304-used for switching, conducting and disconnecting the AC-DC circuit;

AC high voltage isolation switch 3017-used to turn on and break AC and DC circuits;

DC high voltage isolating switch 19-used to turn on and break AC and DC circuits;

The AC and DC contact network 0 of the present invention is suitable for AC 25kV, 50Hz, 15kV, 16.7Hz, DC 3000V, and DC 1500V pantograph network power supply system.

The circuit of the present invention can automatically detect the power supply system of the pantograph network, and can switch the AC and DC power supply modes online.

The working principle of the present invention: the pantograph 1 of a certain power supply unit in Fig. 9 is raised, and the AC/DC detection device 2 judges the AC/DC network voltage of the catenary 0. If it is detected that the current grid voltage is AC power supply (such as AC 25kV, 50Hz or 15kV, 16.7Hz), it means that the vehicle is in AC power supply mode, the AC high-voltage isolation switch 3017 remains closed, and the fourth AC-DC transfer switch 304 of the two power supply units remains off. The AC vacuum circuit breaker 3 in the raised bow power supply unit is closed, and the main transformer 12 is turned on to complete the power supply of the power supply unit. At the same time, the main transformer 12 in the unlifted bow power supply unit is turned on to complete the power supply in the AC power supply mode. If it is detected that the current grid voltage is DC power supply (such as DC 3000V or 1500V), it means that the whole vehicle is in DC power supply mode, the DC high-voltage isolation switch 19 remains closed, and the fourth AC-DC transfer switch 304 in the raised power supply unit is switched from the ground position. When it reaches the DC position, the AC vacuum circuit breaker 3 remains open, closes the DC circuit breaker 6 in the raised bow power supply unit, and turns on the main transformers 12 in the two power supply units to complete power supply in the DC power supply mode.

When the vehicle is in the state of falling bow and no electricity:

If a power supply unit fails, disconnect the AC high voltage isolation switch 3017 to isolate the faulty power supply unit. Raise the bow of another normal power supply unit to supply power to the equipment of the other power supply unit to ensure that the vehicle can run half-train.

When the vehicle is in a live-bow state (if the pantograph 1 of the left power supply unit in Figure 9 is raised, power is supplied to the equipment of the left power supply unit and the right power supply unit):

If the right power supply unit fails, the AC high-voltage isolation switch 3017 can be disconnected to isolate the faulty power supply unit on the right to ensure the normal operation of the left power supply unit.

If the left power supply unit fails, disconnect the AC vacuum circuit breaker 3 of the left power supply unit, and lower the pantograph 1 of the left power supply unit, then disconnect the AC high-voltage isolating switch 3017, and raise the right power supply unit. The pantograph 1 and the AC vacuum circuit breaker 3 of the right power supply unit are closed to supply power to the equipment of the right power supply unit to ensure that the vehicle can run half-train.

If it is detected that the current catenary 0 network voltage is AC, the AC high-voltage isolation switch 3017 is kept closed, the fourth AC-DC transfer switch 304 of the two power supply units is kept open, and the AC vacuum circuit breaker 3 of the raised bow power supply unit is closed. Catenary 0 is connected to the main transformer 12 of the raised bow power supply unit, and power is supplied by the traction motor 14 of the raised bow power supply unit in the AC power supply mode; at the same time, the catenary 0 is connected to the main transformer 12 of the unlifted bow power supply unit. In the AC power supply mode, power is supplied by the traction motor 14 of the unlifted power supply unit;

If it is detected that the current catenary 0 grid voltage is DC, the DC high-voltage isolating switch 19 is kept closed, the AC vacuum circuit breakers 3 of the two power supply units are kept open, and the fourth AC-DC transfer switch 304 of the raised bow power supply unit is closed at the same time. The main transformer 12 of the two power supply units is connected to the DC circuit breaker 6 and the catenary 0, and power is supplied through the traction motors 14 of the two power supply units in the DC power supply mode.

When a device in a power supply unit fails, the AC high-voltage isolation switch 3017 is disconnected to isolate the faulty device of the failed power supply unit, and another power supply unit supplies power to the EMU. Ensure that the circuit can run normally for half of the train.

Description of AC/DC power supply switching:

Switch from AC power supply mode to DC power supply mode: When the vehicle is operating normally in AC mode, before entering DC power supply mode, first disconnect the AC vacuum circuit breakers 3 of the two power supply units to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle coasts Go to the DC power supply area and maintain the ascending state of the pantograph 1. Finally, the AC/DC detection device 2 detects the current catenary 0 grid voltage. When it detects that the current catenary 0 grid voltage is DC, close the raised bow power supply The fourth AC/DC transfer switch 304 and the DC circuit breaker 6 of the unit, and the DC high-voltage isolation switch 19 are kept closed, and switch to the DC power supply mode. That is, the switch from AC power supply to DC power supply is completed.

Switch from DC power supply mode to AC power supply mode: When the vehicle is running normally in DC mode, before entering AC power supply mode, first disconnect the DC circuit breakers 6 of the two power supply units to ensure that the vehicle is in the state of no-bow network power supply, and then the vehicle taxis to AC power supply area and maintain the ascending state of the pantograph 1, and finally the AC/DC detection device 2 detects the current catenary 0 grid voltage, and when it detects that the current catenary 0 grid voltage is AC, disconnect the two power supply units The fourth AC-DC transfer switch 304 is closed, and the AC vacuum circuit breaker 3 in the raised bow power supply unit is closed, and the AC high-voltage isolating switch 3017 is kept closed to switch to the AC power supply mode. That is, the switch from DC power supply to AC power supply is completed.

Figure 10 shows the voltage flow diagram in AC power supply mode. Raise the pantograph 1 of the left power supply unit, and the AC/DC detection device 2 judges the AC/DC network voltage of the catenary 0. If it is detected that the current grid voltage is AC power supply (such as AC 25kV, 50Hz or 15kV, 16.7Hz), it means that the vehicle is in AC power supply mode, the AC high-voltage isolation switch 3017 remains closed, and the fourth AC-DC transfer switch 304 remains stationary (default Is the grounding position), close the AC vacuum circuit breaker 3 of the left power supply unit at the same time, turn on the main transformer 12 of the left power supply unit to complete the power supply of this power supply unit, and turn on the main transformer 12 of the right power supply unit to complete the AC power supply Power supply in mode.

When a failure occurs in AC power supply mode: upgrade the power supply unit, if another power supply unit fails, you can directly disconnect the AC high-voltage isolating switch 3017, cut off the faulty power supply unit, and run half of the train; if the power supply unit fails, you need to replace it In operation, the pantograph 1 of the non-faulty power supply unit is raised to supply power to the normal unit, and the AC high-voltage isolation switch 3017 is also used to isolate the faulty unit.

Figure 11 shows the voltage flow diagram in DC power supply mode. Raise the pantograph 1 of the left power supply unit, and the AC/DC detection device 2 judges the AC/DC network voltage of the catenary 0. If it is detected that the current grid voltage is DC power supply (such as DC 3000V or 1500V), it means that the whole vehicle is in DC power supply mode, keep the DC high voltage isolating switch 19 closed, and the fourth AC/DC transfer switch 304 of the left power supply unit switches from grounding to DC When the AC vacuum circuit breakers 3 of the two power supply units remain open, the DC circuit breaker 6 of the left power supply unit is closed, and the main transformers 12 of the two power supply units are connected to complete the power supply in the DC power supply mode.

When a failure occurs in the DC power supply mode: If the other power supply unit fails, you can directly disconnect the DC high-voltage isolating switch 19, cut off the faulty power supply unit, and run half of the train; if the power supply unit fails, it needs to be upgraded. , Raise the pantograph 1 of the non-faulty power supply unit to supply power to the normal unit, and also use the DC high-voltage isolation switch 19 to isolate the faulty unit.

Figure 12 shows a schematic diagram of the process of switching from AC power supply mode to DC power supply mode. When the vehicle is operating normally in AC power supply mode, the vehicle is in AC power supply mode. Before entering DC power supply mode (AC/DC conversion no-power zone), the vehicle needs to cut off the power supply of two units of AC vacuum circuit breakers 3 to ensure that the vehicle is in a bowless network. Power supply status, the vehicle taxis to the DC power supply area, the pantograph 1 maintains the ascending status, and the AC/DC detection device 2 detects the current status of the bow network to ensure that when DC power is supplied, the fourth AC/DC conversion of the ascended power supply unit The switch 304 is switched from the ground position to the DC position, and at the same time, the DC circuit breaker 6 of the raised bow power supply unit is closed to switch to the DC power supply mode, that is, the switch from AC power supply to DC power supply is completed.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art are Under the enlightenment of the present invention, many forms can be made without departing from the purpose of the present invention and the protection scope of the claims, and these all fall within the protection scope of the present invention.

Claims

An AC/DC grid-side circuit of an EMU, which is characterized by comprising two sets of power supply units, a high-voltage cable (8) and a first high-voltage isolating switch (17) that is normally closed;

Each power supply unit includes a pantograph (1) for receiving voltage on the catenary (0), a normally closed second high-voltage isolating switch (7), an AC and DC detection device (2), and a normally open AC vacuum circuit breaker ( 3) Main transformer (12), converter (13), grounding device (16), normally open first AC/DC transfer switch (104), normally open DC circuit breaker (6); among them, the pantograph The output terminal of (1) passes through the second high-voltage isolation switch (7), AC/DC detection device (2), AC vacuum circuit breaker (3), main transformer (12), converter (13) and the traction of the EMU in turn The motor (14) is connected; one end of the first AC/DC transfer switch (104) is connected between the AC/DC detection device (2) and the AC vacuum circuit breaker (3), and the other end of the first AC/DC transfer switch (104) is in turn It is connected to the traction motor (14) of the EMU through the DC circuit breaker (6), the main transformer (12), and the converter (13); the main transformer (12) and the converter (13) are all connected to the grounding device (16) Ground

The two power supply units are connected by a high-voltage cable (8), and the connection point between the power supply unit and the high-voltage cable (8) is set between the second high-voltage isolating switch (7) and the AC/DC detection device (2); the first high-voltage isolating switch (17) ) Is set on the high-voltage cable (8) between the two power supply units.
An AC/DC grid-side circuit of an EMU, which is characterized by comprising two sets of power supply units, a high-voltage cable (8) and a normally closed third high-voltage isolating switch (2017);

Each power supply unit includes a pantograph (1) for receiving the voltage on the catenary (0), an AC/DC detection device (2), a normally open AC vacuum circuit breaker (3), a main transformer (12), and a converter (13) Grounding device (16), normally open second AC/DC transfer switch (204), normally open DC circuit breaker (6), single-pole double-throw third AC/DC transfer switch (18); The output end of the pantograph (1) is connected to the traction motor (14) of the EMU through the AC and DC detection device (2), AC vacuum circuit breaker (3), main transformer (12), and converter (13) in turn; One end of the second AC/DC transfer switch (204) is connected between the AC/DC detection device (2) and the AC vacuum circuit breaker (3), and the other end of the second AC/DC transfer switch (204) is connected to one end of the DC circuit breaker (6) The other end of the DC circuit breaker (6) is connected to the traction motor (14) of the EMU through the main transformer (12) and the converter (13) in turn. The other end of the DC circuit breaker (6) is also connected to the third AC/DC conversion The first stationary end of the switch (18) is connected, and the second stationary end of the third AC/DC transfer switch (18) is connected between the AC vacuum circuit breaker (3) and the main transformer (12); under normal conditions, the third The first stationary end of the AC-DC transfer switch (18) is connected to the movable end of the third AC-DC transfer switch (18);

Both the main transformer (12) and the converter (13) are grounded through the grounding device (16);

The two power supply units are connected by a high-voltage cable (8), the movable end of the third AC/DC switch (18) is connected to the high-voltage cable (8), and the third high-voltage isolating switch (2017) is set on the high-voltage cable between the two power supply units (8) On.
An EMU AC and DC grid-side circuit, which is characterized by comprising two groups of independent power supply units, AC high voltage cables (308), DC high voltage cables (20), normally closed AC high voltage isolation switches (3017), and normally closed DC High-voltage isolation switch (19);

Each power supply unit includes a pantograph (1) for receiving the voltage on the catenary (0), an AC/DC detection device (2), a normally open AC vacuum circuit breaker (3), a main transformer (12), and a converter (13) Grounding device (16), normally open fourth AC/DC switch (304), normally open DC circuit breaker (6); among them, the output end of the pantograph (1) passes through the AC/DC detection device in turn (2) The AC vacuum circuit breaker (3), the main transformer (12), and the converter (13) are connected to the traction motor (14) of the EMU; one end of the fourth AC/DC transfer switch (304) is connected to the AC/DC Between the detection device (2) and the AC vacuum circuit breaker (3), the other end of the fourth AC/DC transfer switch (304) passes through the DC circuit breaker (6), the main transformer (12), the converter (13) and The traction motor (14) of the EMU is connected; the main transformer (12) and the converter (13) are all grounded through the grounding device (16);

The AC high voltage cable (308) and the DC high voltage cable (20) are located between the two power supply units; the connection point between the power supply unit and the AC high voltage cable (308) is located between the AC vacuum circuit breaker (3) and the main transformer (12) The connection point between the power supply unit and the DC high-voltage cable (20) is set between the DC circuit breaker (6) and the main transformer (12);

The AC high voltage isolation switch (3017) is arranged on the AC high voltage cable (308) between the two power supply units; the DC high voltage isolation switch (19) is arranged on the DC high voltage cable (20) between the two power supply units.
A method for controlling the AC/DC grid-side circuit of the EMU according to claim 1, characterized in that, when there is no fault in the two power supply units, it comprises:

The AC/DC detection device (2) detects the network voltage of the catenary (0). If it detects that the current catenary (0) is AC, the first high-voltage isolating switch (17) is kept closed, and the first high-voltage isolation switch (17) is kept closed. An AC/DC transfer switch (104) is opened, the AC vacuum circuit breakers (3) of the two power supply units are closed, the contact net (0) is connected to the main transformer (12), and power is supplied through the traction motor (14) in the AC power supply mode ; If it is detected that the current catenary (0) network voltage is DC, keep the first high-voltage isolating switch (17) closed, keep the AC vacuum circuit breakers (3) of the two power supply units open, and close the two power supply units at the same time The first AC-DC transfer switch (104) and the DC circuit breaker (6), the contact net (0) is connected to the main transformer (12), and the power is supplied by the traction motor (14) in the DC power supply mode.
The control method of the AC/DC grid-side circuit of the EMU according to claim 4, characterized in that when a pantograph (1) fails, the second high-voltage isolating switch (7) in the corresponding power supply unit is disconnected , Another power supply unit supplies power to the EMU.
The method for controlling the AC/DC grid-side circuit of the EMU according to claim 4, characterized in that, when equipment other than the pantograph (1) in a certain power supply unit fails, the first high-voltage isolating switch ( 17), another power supply unit supplies power to the EMU.
The control method for the AC and DC grid-side circuit of the EMU according to claim 4, characterized in that, before the AC power supply mode is switched to the DC power supply mode, the AC vacuum circuit breakers (3) of the two power supply units are first disconnected, and then the vehicle coasts to DC power supply area and maintain the ascending state of the pantograph (1), and finally the AC/DC detection device (2) detects the current catenary (0) network voltage, when it is detected that the current catenary (0) network voltage is DC At this time, the first AC/DC transfer switch (104) and the DC circuit breaker (6) of the two power supply units are closed to switch to the DC power supply mode.
The method for controlling the AC and DC grid-side circuit of the EMU according to claim 4, characterized in that, before the DC power supply mode is switched to the AC power supply mode, the DC circuit breakers (6) of the two power supply units are first disconnected, and then the vehicle coasts to the AC power supply mode. Power supply area and keep the pantograph (1) in the ascending state, and finally the AC/DC detection device (2) detects the current catenary (0) network voltage, when it is detected that the current catenary (0) network voltage is AC , Disconnect the first AC/DC transfer switches (104) of the two power supply units, and close the AC vacuum circuit breakers (3) of the two power supply units to switch to the AC power supply mode.
A method for controlling the AC/DC grid-side circuit of the EMU according to claim 2, characterized in that, when the two power supply units have no faults, the method comprises:

Raise the pantograph (1) of a certain power supply unit, and the AC/DC detection device (2) corresponding to the raised power supply unit detects the network voltage of the catenary (0);

If it is detected that the current catenary (0) grid voltage is AC, keep the third high-voltage isolation switch (2017) closed, keep the second AC-DC transfer switches (204) of the two power supply units open, and close the raised bow power supply unit The AC vacuum circuit breaker (3), the contact network (0) is connected to the main transformer (12) of the raised bow power supply unit, and the power is supplied by the traction motor (14) of the raised bow power supply unit in the AC power supply mode; at the same time, the two The moving end of the third AC/DC transfer switch (18) of the power supply unit is connected to the second fixed end, the contact net (0) is connected to the main transformer (12) of the power supply unit of the non-lifting bow, and it passes through the main transformer (12) of the non-lifting power supply unit under the AC power supply mode. The power supply of the traction motor (14) of the bow power supply unit;

If it is detected that the current catenary (0) grid voltage is DC, keep the third high voltage isolating switch (2017) closed, keep the AC vacuum circuit breakers (3) of the two power supply units open, and keep the moving ends of the two power supply units Connected to the first stationary end, and at the same time close the second AC/DC transfer switch (204) and DC circuit breaker (6) of the raised bow power supply unit, and the contact network (0) is connected to the main transformers (12) of the two power supply units. In the DC power supply mode, power is supplied by the traction motors (14) of the two power supply units.
The control method of the AC/DC grid-side circuit of the EMU according to claim 9, wherein when a device in a power supply unit fails, the third high-voltage isolation switch (2017) is turned off, and the other power supply unit Supply power to the EMU.
The control method of the AC/DC grid-side circuit of the EMU according to claim 9, characterized in that, before the AC power supply mode is switched to the DC power supply mode, the AC vacuum circuit breakers (3) of the two power supply units are first disconnected, and then the vehicle coasts to DC power supply area and maintain the ascending state of the pantograph (1), and finally the AC/DC detection device (2) detects the current catenary (0) network voltage, when it is detected that the current catenary (0) network voltage is DC When, close the second AC-DC transfer switch (204) and DC circuit breaker (6) of the raised bow power supply unit, and simultaneously connect the moving end and the first stationary end of the third AC-DC transfer switch (18) of the two power supply units End, switch to DC power supply mode.
The method for controlling the AC and DC grid-side circuit of the EMU according to claim 9, characterized in that, before the DC power supply mode is switched to the AC power supply mode, the DC circuit breakers (6) of the two power supply units are first disconnected, and then the vehicle coasts to the AC power supply mode. Power supply area and keep the pantograph (1) in the ascending state, and finally the AC/DC detection device (2) detects the current catenary (0) network voltage, when it is detected that the current catenary (0) network voltage is AC , Disconnect the second AC/DC transfer switch (204) of the two power supply units, and close the AC vacuum circuit breaker (3) in the raised bow power supply unit, and connect the third AC/DC transfer switch (18) of the two power supply units at the same time ) The moving end and the second fixed end are switched to AC power supply mode.
A method for controlling the AC/DC grid-side circuit of the EMU according to claim 3, characterized in that, when there is no fault in the two power supply units, it comprises:

Raise the pantograph (1) of a certain power supply unit, and the AC/DC detection device (2) corresponding to the raised power supply unit detects the network voltage of the catenary (0);

If it is detected that the current catenary (0) grid voltage is AC, keep the AC high-voltage isolation switch (3017) closed, keep the fourth AC-DC switch (304) of the two power supply units open, and close the power supply unit The AC vacuum circuit breaker (3) and the contact net (0) are connected to the main transformer (12) of the raised bow power supply unit, and power is supplied by the traction motor (14) of the raised bow power supply unit in the AC power supply mode; at the same time, the contact net (0) Connect the main transformer (12) of the power supply unit of the non-lifting bow, and supply power through the traction motor (14) of the power supply unit of the non-lifting bow in the AC power supply mode;

If it is detected that the current catenary (0) grid voltage is DC, keep the DC high-voltage isolating switch (19) closed, keep the AC vacuum circuit breakers (3) of the two power supply units open, and close the first power supply unit of the raised bow power supply unit at the same time. Four AC/DC transfer switches (304) and DC circuit breakers (6), the contact net (0) connects the main transformers (12) of the two power supply units, and the traction motors (14) of the two power supply units pass through the DC power supply mode powered by.
The method for controlling the AC/DC grid-side circuit of the EMU according to claim 13, characterized in that, when a device in a power supply unit fails, the AC high-voltage isolation switch (3017) is disconnected, and the other power supply unit The EMU provides power supply.
The method for controlling the AC/DC grid-side circuit of the EMU according to claim 13, characterized in that, before the AC power supply mode is switched to the DC power supply mode, the AC vacuum circuit breakers (3) of the two power supply units are first disconnected, and then the vehicle coasts to DC power supply area and maintain the ascending state of the pantograph (1), and finally the AC/DC detection device (2) detects the current catenary (0) network voltage, when it is detected that the current catenary (0) network voltage is DC At this time, the fourth AC-DC transfer switch (304) and the DC circuit breaker (6) of the raised bow power supply unit are closed, and the DC high-voltage isolating switch (19) is kept closed to switch to the DC power supply mode.
The method for controlling the AC and DC grid-side circuit of the EMU according to claim 13, characterized in that, before the DC power supply mode is switched to the AC power supply mode, the DC circuit breakers (6) of the two power supply units are first disconnected, and then the vehicle coasts to the AC power supply mode. Power supply area and keep the pantograph (1) in the ascending state, and finally the AC/DC detection device (2) detects the current catenary (0) network voltage, when it is detected that the current catenary (0) network voltage is AC , Disconnect the fourth AC/DC switch (304) of the two power supply units, close the AC vacuum circuit breaker (3) in the power supply unit that has been raised, and keep the AC high voltage isolating switch (3017) closed, and switch to AC power supply mode.