CN114633640A - Power switching system and method of railway vehicle and railway vehicle - Google Patents
Power switching system and method of railway vehicle and railway vehicle Download PDFInfo
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- CN114633640A CN114633640A CN202210050621.5A CN202210050621A CN114633640A CN 114633640 A CN114633640 A CN 114633640A CN 202210050621 A CN202210050621 A CN 202210050621A CN 114633640 A CN114633640 A CN 114633640A
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- detection device
- voltage detection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/53—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells in combination with an external power supply, e.g. from overhead contact lines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
- B60L5/18—Current collectors for power supply lines of electrically-propelled vehicles using bow-type collectors in contact with trolley wire
- B60L5/22—Supporting means for the contact bow
- B60L5/28—Devices for lifting and resetting the collector
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to the technical field of railway vehicles, and provides a power switching system and method of a railway vehicle and the railway vehicle. The power switching system of a railway vehicle includes: a current transformer; the three-phase uncontrolled rectifier module comprises a common anode and a common cathode, the common anode is respectively connected with the current transformer and the steel rail, and the common cathode is connected with the current transformer; the power pack is electrically connected with the three-phase uncontrolled rectifying module; the first end of the pantograph is used for being connected with a power grid, and the second end of the pantograph is connected with the common cathode; the first end of the first voltage detection device is connected with the pantograph, and the second end of the first voltage detection device is connected with the common anode; the first end of the second voltage detection device is connected with the common cathode, and the second end of the second voltage detection device is connected with the common anode. The power switching system of the railway vehicle can select a power pack power supply mode and a power grid power supply mode, and can complete switching of the power supply modes. And whether the power supply modes can be switched can be determined by detecting corresponding voltage values, so that the two power supply modes can be prevented from running simultaneously, and safety accidents are avoided.
Description
Technical Field
The invention relates to the technical field of railway vehicles, in particular to a power switching system and method of a railway vehicle and the railway vehicle.
Background
The double-power motor train unit using the power pack and the power grid as power sources can be applied to electrified railway sections and non-electrified railway sections. In view of the above, it would be desirable to provide a power switching system for a rail vehicle capable of switching power sources.
Disclosure of Invention
The invention provides a power switching system and method of a railway vehicle and the railway vehicle, which are used for switching power sources.
An embodiment of the invention provides a power switching system of a rail vehicle, which includes:
a current transformer;
the three-phase uncontrolled rectifier module comprises a common anode and a common cathode, the common anode is respectively connected with the current transformer and the steel rail, and the common cathode is connected with the current transformer;
the power pack is electrically connected with the three-phase uncontrolled rectifying module;
the first end of the pantograph is used for being connected with a power grid, and the second end of the pantograph is connected with the common cathode;
a first voltage detection device, a first end of which is connected with the pantograph and a second end of which is connected with the common anode;
a second voltage detection device, wherein a first end is connected with the common cathode, and a second end is connected with the common anode;
when power pack power supply is selected, under the condition that the voltage value detected by the first voltage detection device is determined not to be detected and the voltage value detected by the second voltage detection device is within an allowable range, power is supplied to the converter through the power pack;
when the power supply of the power grid is selected, under the condition that the voltage value detected by the first voltage detection device is determined to be in an allowable range and the voltage value is not detected by the second voltage detection device, the power is supplied to the converter through the power grid.
According to one embodiment of the invention, the device further comprises a line contactor, a pre-charging contactor and a pre-charging resistor;
the circuit contactor is arranged between the common cathode and the converter, the pre-charging contactor is connected with the pre-charging resistor in series, and the pre-charging contactor and the pre-charging resistor are connected with the circuit contactor in parallel after being connected in series.
According to an embodiment of the present invention, further comprising a high speed circuit breaker, through which the second end of the pantograph is connected with the common cathode;
wherein a first end of the high-speed circuit breaker is connected with a second end of the pantograph, and a second end of the high-speed circuit breaker is connected with the common cathode.
According to one embodiment of the invention, the system further comprises a first isolating switch;
the first isolating switch is arranged between the pantograph and the high-speed circuit breaker.
According to one embodiment of the invention, the device further comprises a grounding wire and a second isolating switch;
and the second end of the pantograph and the common cathode are connected with the grounding wire through the second isolating switch.
According to one embodiment of the invention, the lightning arrester further comprises a lightning arrester;
the first end of the lightning arrester is connected with the second end of the pantograph, and the second end of the lightning arrester is grounded.
According to one embodiment of the invention, further comprising a fuse;
the fuse is arranged between the first voltage detection device and the first end of the high-speed circuit breaker.
Another embodiment of the present invention further provides a power switching method, implemented based on the power switching system of a rail vehicle as described in any one of the above embodiments, when selecting a power pack to supply power, including:
lowering the pantograph;
starting the power pack;
closing the pre-charging contactor when it is determined that the first voltage detection device does not detect the voltage value and the voltage value detected by the second voltage detection device is in an allowable range;
when the power supply of the power grid is selected, the method comprises the following steps:
stopping the power pack;
raising the pantograph;
and closing the high-speed circuit breaker and the pre-charging contactor when the voltage value detected by the first voltage detection device is determined to be in an allowable range and the voltage value is not detected by the second voltage detection device.
According to an embodiment of the invention, when the power pack is selected to supply power, the method further comprises the following steps:
when the first voltage detection device detects the voltage, sending a simultaneous power supply alarm;
and/or sending a power pack power supply abnormity alarm when the voltage value detected by the second voltage detection device is determined not to be in the allowable range.
According to an embodiment of the invention, when selecting the power supply of the power grid, the method further comprises the following steps:
when the voltage value detected by the first voltage detection device is determined not to be in the allowable range, detecting the closing states of the high-speed circuit breaker, the pre-charging contactor and the line contactor, and opening all the high-speed circuit breaker, the pre-charging contactor and the line contactor which are in the closing states;
and/or sending power pack abnormal power supply alarm when the second voltage detection device detects the voltage.
According to an embodiment of the present invention, after said starting said power pack, further comprising:
and detecting the opening and closing states of the high-speed circuit breaker, the pre-charging contactor and the line contactor, and opening all the high-speed circuit breaker, the pre-charging contactor and the line contactor in a closed state.
In another aspect, an embodiment of the present invention further provides a rail vehicle, which includes the power switching system of a rail vehicle as described in any one of the above, or when power switching is performed, the power switching method of a rail vehicle as described in any one of the above is adopted.
According to the power switching system of the railway vehicle, when the power pack is selected for power supply, the pantograph can be lowered to be disconnected with a power grid, then the power pack is started, and when the fact that the first voltage detection device does not detect the voltage value and the voltage value detected by the second voltage detection device is within the allowable range is determined, the power pack supplies power to the converter. When the grid power supply is selected, the power pack may be stopped, the pantograph may be raised, and the converter may be supplied with power through the grid when it is determined that the voltage value detected by the first voltage detection device is in the allowable range and the voltage value is not detected by the second voltage detection device.
In this way, the power switching system of the railway vehicle provided by the embodiment of the invention can select the power pack power supply mode and the power grid power supply mode, and can complete switching of the power supply modes. And whether the power supply modes can be switched can be determined by detecting corresponding voltage values, so that the two power supply modes can be prevented from running simultaneously, and safety accidents are avoided.
According to the power switching method provided by the embodiment of the invention, in the process of switching the power supply modes, whether the power supply modes can be switched is determined by detecting the corresponding voltage value, so that the two power supply modes can be prevented from running simultaneously, and safety accidents are avoided.
Further, the rail vehicle according to the present invention has all the advantages described above because it has the power switching system of the rail vehicle as described above or adopts the power switching method of the rail vehicle as described above.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a power switching system of a rail vehicle in some embodiments provided by the present invention;
FIG. 2 is a schematic flow chart illustrating operations for selecting a power pack power mode in some embodiments provided herein;
FIG. 3 is a schematic flow chart of actions for selecting a grid power mode in some embodiments provided by the present invention;
FIG. 4 is a schematic flow chart diagram of a power switching method in some embodiments provided by the present disclosure;
FIG. 5 is a schematic flow chart of selecting a power pack to provide power in some embodiments provided by the present invention;
FIG. 6 is a schematic flow chart of selecting a grid supply in some embodiments provided by the present invention;
reference numerals:
1. a three-phase uncontrolled rectifying module; 2. a common anode; 3. a common cathode; 4. a steel rail; 5. a line contactor; 6. pre-charging a contactor; 7. pre-charging a resistor; 8. a power pack; 9. a pantograph; 10. a high speed circuit breaker; 11. a first voltage detection device; 12. a second voltage detection device; 13. a first isolation switch; 14. a second isolation switch; 15. a fuse; 16. a lightning arrester; 17. high-voltage electric box.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 6, a power switching system of a railway vehicle in an embodiment provided by the present invention will be described.
Specifically, the power switching system of the railway vehicle comprises a current transformer, a three-phase uncontrolled rectifier module 1, a power pack 8, a pantograph 9, a first voltage detection device 11 and a second voltage detection device 12.
Related contents of the three-phase uncontrolled rectifier module 1 belong to the prior art, and details about the principle and the structure thereof are not described again. The three-phase uncontrolled rectifier module 1 comprises a power input end, a common anode 2 and a common cathode 3. The common anode 2 and the common cathode 3 are both electrically connected to the current transformer, for example by wires. The common anode 2 is also electrically connected with the steel rail 4, namely the steel rail 4 is used as a zero potential point.
The converter can be a main and auxiliary integrated traction converter.
And the power pack 8 is electrically connected with the power input end of the three-phase uncontrolled rectifying module. The power pack 8 typically includes an electric generator and an internal combustion engine. The internal combustion engine is in transmission connection with the generator to drive the generator to generate electricity. And the power output end of the generator is electrically connected with the power input end of the three-phase uncontrolled rectifying module 1.
The first end of the pantograph 9 is used for connecting with the power grid, and the second end of the pantograph 9 is connected with the common anode.
A first end of the first voltage detection device 11 is connected to the pantograph 9, and a second end of the first voltage detection device 11 is connected to the common anode 2. As shown in fig. 1, when the pantograph 9 is connected to the grid, the first voltage detection device 11 can detect the voltage value of the grid.
A first terminal of the second voltage detection device 12 is connected to the common cathode 3, and a second terminal of the second voltage detection device 12 is connected to the common anode 2. When the power pack 8 works normally, the second voltage detection device 12 can detect the voltage value output by the three-phase uncontrolled rectifier module 1.
Alternatively, the first voltage detection device 11 and the second voltage detection device 12 may each be a voltage sensor.
According to the power switching system of the railway vehicle provided by the embodiment of the invention, when the power pack is selected for power supply, the pantograph 9 can be lowered to be disconnected with a power grid, then the power pack 8 is started, and when the voltage value detected by the first voltage detection device 11 is determined not to be detected and the voltage value detected by the second voltage detection device 12 is determined to be in the allowable range, the power pack 8 is used for supplying power to the converter. When the grid power supply is selected, the power pack 8 may be stopped, the pantograph 9 may be raised, and the converter may be supplied with power through the grid when it is determined that the voltage value detected by the first voltage detection device 11 is in the allowable range and the voltage value is not detected by the second voltage detection device 12.
By the arrangement, the power switching system of the railway vehicle provided by the embodiment of the invention can select the power supply mode of the power pack and the power supply mode of the power grid, and can complete the switching of the power supply modes. And whether the power supply modes can be switched can be determined by detecting corresponding voltage values, so that the two power supply modes can be prevented from running simultaneously, and safety accidents are avoided.
In some embodiments provided by the present invention, the power switching system of the rail vehicle further comprises a line contactor 5, a pre-charge contactor 6, and a pre-charge resistor 7.
A line contactor 5 is provided between the common cathode 3 and the current transformer for switching the common cathode 3 on and off the current transformer. The pre-charging contactor 6 is connected in series with the pre-charging resistor 7, and the pre-charging contactor and the pre-charging resistor are connected in parallel with the line contactor 5 after being connected in series.
In some embodiments provided herein, the power switching system of a rail vehicle further comprises a high speed circuit breaker.
The second end of the pantograph is connected with the common cathode through a high-speed circuit breaker.
The first end of the high-speed circuit breaker is connected with the second end of the pantograph, and the second end of the high-speed circuit breaker is connected with the common cathode.
Specifically, when the power pack power supply is selected, the pantograph 9 may be lowered to be disconnected from the grid, the power pack 8 may then be started, and when it is determined that the voltage value is not detected by the first voltage detection device 11 and the voltage value detected by the second voltage detection device 12 is within the allowable range, the pre-charging contactor may be closed to conduct the power pack with the converter so that the power pack 8 supplies power to the converter.
When the grid power supply is selected, the power pack 8 may be stopped, then the pantograph 9 may be raised, and when it is determined that the voltage value detected by the first voltage detection device 11 is within the allowable range and the voltage value is not detected by the second voltage detection device 12, the high-speed circuit breaker and the pre-charging contactor may be closed to conduct the grid and the converter, so that the grid supplies power to the converter.
At the moment when the power supply end, such as the power grid or the power pack 8, is connected with the converter, the current in the circuit is large, and if the circuit contactor 5 is directly closed, the electric elements can be burnt. Therefore, the pre-charging contactor 6 can be closed first, and at this time, the pre-charging resistor 7 is in the loop, so that the voltage in the circuit can be shared, the current in the loop is reduced, and the element is prevented from being burnt out due to overlarge current. After a certain time, the line contactor 5 is then closed again.
In some embodiments provided by the present invention, the power switching system of the rail vehicle further comprises a first disconnector 13.
The first disconnector 13 is disposed between the pantograph 9 and the high-speed circuit breaker 10. When the power pack power supply is selected, after the high-speed circuit breaker 10 is switched off, the first disconnecting switch 13 can be switched off, so that the first voltage detection device 11 can not detect the voltage value, and the power pack 8 can be started normally. Thus, even if the pantograph 9 may not be completely separated from the power grid or electrified due to other reasons, the problem of double-power simultaneous power supply is not caused, and the power supply safety and the power switching efficiency are improved.
In some embodiments provided by the present invention, the power switching system of the rail vehicle further comprises a ground line and a second disconnector 14.
The second end of the pantograph 9 and the common cathode 3 are both connected to the ground line through a second isolation switch 14. So set up, in the in-process of overhauing or maintaining, can open second isolator 14, make equipment ground connection to guarantee constructor's personal safety.
In some embodiments provided by the present invention, the power switching system of the rail vehicle further comprises a fuse 15.
The fuse 15 is disposed between the first voltage detection device 11 and the first end of the high speed circuit breaker 10. The safety of the first voltage detection device 11 can be guaranteed by arranging the fuse 15, and the first voltage detection device 11 is prevented from being burnt.
In some embodiments provided by the present invention, the power switching system of the rail vehicle further comprises a high voltage electrical box 17.
The three-phase uncontrolled rectifier module 1, the high-speed circuit breaker 10, the first isolating switch 13, the second isolating switch 14 and the fuse 15 can be arranged in the high-voltage electric box 17, the number of the installation seats in the vehicle body is reduced by arranging the high-voltage electric box 17, the difficulty of wire wiring is reduced, and the operability of equipment maintenance can be improved.
In some embodiments provided by the present invention, the power switching system of the railway vehicle further comprises a lightning arrester 16.
A first end of the arrester 16 is connected to a second end of the pantograph 9, and a second end of the arrester 16 is grounded. The problem of vehicle being struck by lightning can be avoided by providing the arrester 16.
Of course, the respective portions in the above respective embodiments may be combined.
For example, in some embodiments provided herein, a power switching system for a rail vehicle includes: the three-phase uncontrolled rectifier module 1, a pre-charging device, a power pack 8, a pantograph 9, a high-speed circuit breaker 10, a first voltage detection device 11, a second voltage detection device 12, a first isolating switch 13, a grounding wire, a second isolating switch 14, a lightning arrester 16 and a fuse 15.
The three-phase uncontrolled rectifying module 1 comprises a power input end, a common anode 2 and a common cathode 3, wherein the common anode 2 and the common cathode 3 are both connected with the converter, and the common anode 2 is connected with a steel rail 4. The pre-charging device comprises a line contactor 5, a pre-charging contactor 6 and a pre-charging resistor 7, wherein the line contactor 5 is arranged between the common cathode 3 and the converter, the pre-charging contactor 6 is connected with the pre-charging resistor 7 in series, and the pre-charging contactor 6 and the pre-charging resistor 7 are connected in parallel with the line contactor 5 after being connected in series. The power pack 8 is electrically connected with the power input end. The pantograph 9 has a first end for connection to the grid, a second end connected to a first end of a high-speed circuit breaker 10, and a second end of the high-speed circuit breaker 10 connected to the common cathode 3.
The first voltage detection device 11 has a first end connected to the first end of the high-speed circuit breaker 10, and a second end connected to the common anode 2. The second voltage detection device 12 has a first terminal connected to the common cathode 3 and a second terminal connected to the common anode 2. The first disconnector 13 is disposed between the pantograph 9 and the high-speed circuit breaker 10. The second end of the pantograph 9 and the common cathode 3 are both connected to the ground line through a second isolation switch 14. A first end of the arrester 16 is connected to a second end of the pantograph 9, and a second end of the arrester 16 is grounded. The fuse 15 is disposed between the first voltage detection device 11 and the first end of the high speed circuit breaker 10.
Referring to fig. 2-6, the present invention provides a power switching method in an embodiment.
Specifically, the power switching method is implemented based on the power switching system of the railway vehicle of any one of the above. The power switching method includes step S100 and step S200. It should be noted that the reference numerals of step S100 and step S200 are for convenience of description, and the execution order of the two steps is not limited at all.
And S100, selecting a power pack to supply power. When the vehicle is running to the non-electric railway section, the power supply of the selective power pack can be implemented by triggering a corresponding button or knob by an operator, such as a driver.
The selective power pack power supply includes step S101, step S102, and step S103.
Step S101 is to lower the pantograph 9.
Referring to fig. 2, further, the pantograph 9 lowering may include: sending a pantograph lowering signal to the pantograph 9, detecting whether the pantograph 9 is in place after sending the pantograph lowering signal for a period of time, sending an alarm of not lowering the pantograph in place if detecting that the pantograph 9 is not in place, prompting an operator, and sending the pantograph lowering signal again. If detecting that the pantograph 9 has been lowered to the position, step S102 is executed.
In this way, by detecting the pantograph lowering state of the pantograph 9 and using the pantograph lowering state of the pantograph 9 as a condition whether to operate in the next step, it is possible to effectively avoid a problem that the power pack 8 supplies power while the pantograph 9 is connected to the power grid.
And step S102, starting the power pack 8. That is, the internal combustion engine is started to drive the generator to generate electricity.
Further, after the power pack 8 is started, when the converter end does not detect a power pack permission load access command, the method further comprises the following steps:
the open/close states of the high-speed circuit breaker 10, the precharge contactor 6, and the line contactor 5 are detected, and all of them in the closed state are opened.
By detecting the open/close state of the high-speed circuit breaker 10 and opening the high-speed circuit breaker 10 when the high-speed circuit breaker 10 is closed, communication with the common cathode 3 can be avoided when the pantograph 9 is abnormally detected by pantograph lowering. And the pre-charging contactor 6 and the line contactor 5 are disconnected, so that the connection with the converter can be prevented when the engine runs unstably.
Step S103, when it is determined that the voltage value is not detected by the first voltage detection device 11 and the voltage value detected by the second voltage detection device 12 is in the allowable range, the precharge contactor 6 is closed.
When the first voltage detection device 11 does not detect the voltage value, it indicates that no current is introduced into the converter in the power grid, and the problem of simultaneous power supply by dual motors does not exist. And when the voltage value detected by the second voltage detection device 12 is within the allowable range, it indicates that the power pack 8 is stable in operation, and the power pack 8 allows the load to be connected, the pre-charging contactor 6 is closed, so that the three-phase uncontrolled rectifier module 1 is conducted with the converter, and after a certain time interval, the line contactor 5 can be closed. The converter can be output according to a power supply mode of the battery pack.
In some embodiments provided herein, selecting the power pack to supply further comprises: when it is determined that the first voltage detection means 11 detects the voltage value, a simultaneous power supply alarm is sent. When the first voltage detection device 11 detects the voltage value, it is indicated that the grid can be conducted with the converter, and the state of the pantograph 9 and the state of the high-speed circuit breaker 10 need to be checked.
And/or sending a power pack 8 power supply abnormity alarm when the voltage value detected by the second voltage detection device 12 is determined not to be in the allowable range. The second voltage detection device 12 detects that the voltage value is not within the allowable range, and timely prompts an operator to detect the state of the power pack 8.
And step S200, selecting a power grid for power supply. When the vehicle is moving to the electrified railway section, an operator, such as a driver, may select the grid supply mode by activating a corresponding button or knob.
Referring to fig. 6, selecting the grid power supply includes step S201, step S202, and step S203.
Step S201 stops the power pack 8.
Referring to fig. 3, further, the shutting down the power pack 8 includes: and sending a stop command to the power pack 8, and detecting whether the power pack 8 stops or not after the stop command is sent. If the power pack 8 is not stopped, sending an alarm that the power pack 8 is not stopped to prompt an operator that the power pack is not normally stopped, and sending a stop instruction of the power pack 8 again. If the power pack 8 is stopped, step S202 is executed.
Therefore, the problem that the power pack 8 and the power grid supply power simultaneously can be effectively avoided by detecting the running state of the power pack and using the running state of the power pack as the condition whether to run or not in the next step.
Step S202, the pantograph 9 is lifted. I.e. the pantograph 9 is driven to rise against the grid and thus to conduct with the grid.
Step S203, when it is determined that the voltage value detected by the first voltage detection device 11 is within the allowable range and the voltage value is not detected by the second voltage detection device 12, the high speed circuit breaker 10 and the precharge contactor 6 are closed.
When the voltage value detected by the first voltage detection device 11 is within the allowable range, it indicates that the pantograph 9 is normally connected to the grid and is on, and power supply is possible. The second voltage detection device 12 does not detect the voltage value, which means that the power pack 8 has no current output, so that the problem of dual-power simultaneous power supply does not exist. The high-speed circuit breaker 10 and the pre-charging contactor 6 are closed to conduct the grid and the converter, and after a time interval, the line contactor 5 can be closed. And the converter outputs according to the power grid power supply mode.
In some embodiments provided by the present invention, selecting a grid supply further includes:
when it is determined that the voltage value detected by the first voltage detection device 11 is not within the allowable range, the open/close states of the high-speed circuit breaker 10, the precharge contactor 6, and the line contactor 5 are detected, and all of them in the closed state are opened. When the voltage value detected by the first voltage detection device 11 is not within the allowable range, it indicates that the condition for conducting the grid and the converter is not satisfied at this time, and the high-speed circuit breaker 10, the pre-charging contactor 6 and the line contactor 5 should be prevented from being closed, so as to prevent the grid and the converter from being conducted.
And/or sending an abnormal power supply alarm of the power pack 8 when the second voltage detection device 12 detects the voltage. When the second voltage detection device 12 detects the voltage value, it indicates that the power pack 8 can supply power, and at this time, an abnormal power supply alarm of the power pack 8 is sent to prompt an operator to detect the running state of the power pack 8.
The embodiment of the invention also provides a railway vehicle.
Specifically, the rail vehicle comprises the power switching system of the rail vehicle as described in any one of the above. Or when power switching is performed, the power switching method of the rail vehicle as described above is employed.
It should be noted that the power switching system of the railway vehicle including the above-mentioned railway vehicle also includes all the advantages thereof, and the details are not described herein. Meanwhile, if the rail vehicle adopts the power switching method of the rail vehicle, all advantages of the rail vehicle are included, and detailed description is omitted here.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A power switching system for a rail vehicle, comprising:
a current transformer;
the three-phase uncontrolled rectifying module comprises a common anode and a common cathode, wherein the common anode is respectively connected with the current transformer and the steel rail, and the common cathode is connected with the current transformer;
the power pack is electrically connected with the three-phase uncontrolled rectifying module;
the first end of the pantograph is used for being connected with a power grid, and the second end of the pantograph is connected with the common cathode;
a first voltage detection device, a first end of which is connected with the pantograph and a second end of which is connected with the common anode;
a second voltage detection device, a first end of which is connected with the common cathode and a second end of which is connected with the common anode;
when power pack power supply is selected, under the condition that the voltage value detected by the first voltage detection device is determined not to be detected and the voltage value detected by the second voltage detection device is within an allowable range, power is supplied to the converter through the power pack;
when the power supply of the power grid is selected, under the condition that the voltage value detected by the first voltage detection device is determined to be in an allowable range and the voltage value is not detected by the second voltage detection device, the power is supplied to the converter through the power grid.
2. The rail vehicle power switching system of claim 1, further comprising a line contactor, a pre-charge contactor, and a pre-charge resistor;
the circuit contactor is arranged between the common cathode and the converter, the pre-charging contactor is connected with the pre-charging resistor in series, and the pre-charging contactor and the pre-charging resistor are connected with the circuit contactor in parallel after being connected in series.
3. The rail vehicle power switching system of claim 2, further comprising a high speed circuit breaker through which the second end of the pantograph is connected with the common cathode;
wherein a first end of the high-speed circuit breaker is connected with a second end of the pantograph, and a second end of the high-speed circuit breaker is connected with the common cathode.
4. The rail vehicle power switching system of claim 3, further comprising a first isolation switch;
the first isolating switch is arranged between the pantograph and the high-speed circuit breaker.
5. The power switching system of a railway vehicle as claimed in any one of claims 3, further comprising a ground line and a second isolation switch;
and the second end of the pantograph and the common cathode are connected with the grounding wire through the second isolating switch.
6. A power switching method implemented based on the power switching system of a railway vehicle according to any one of claims 3 to 5, when selecting power pack supply, comprising:
lowering the pantograph;
starting the power pack;
closing the pre-charging contactor when it is determined that the first voltage detection device does not detect the voltage value and the voltage value detected by the second voltage detection device is in an allowable range;
when the power supply of the power grid is selected, the method comprises the following steps:
stopping the power pack;
raising the pantograph;
closing the high-speed circuit breaker and the pre-charging contactor when it is determined that the voltage value detected by the first voltage detection device is within an allowable range and the voltage value is not detected by the second voltage detection device.
7. The power switching method according to claim 6, further comprising, when selecting power pack supply:
when the first voltage detection device detects the voltage, sending a simultaneous power supply alarm;
and/or sending a power pack power supply abnormity alarm when the voltage value detected by the second voltage detection device is determined not to be in the allowable range.
8. The power switching method according to claim 6, further comprising, when selecting a grid supply:
when the voltage value detected by the first voltage detection device is determined not to be in the allowable range, detecting the closing states of the high-speed circuit breaker, the pre-charging contactor and the line contactor, and opening all the high-speed circuit breaker, the pre-charging contactor and the line contactor which are in the closing states;
and/or sending power pack abnormal power supply alarm when the second voltage detection device detects the voltage.
9. The power switching method according to any one of claim 6, further comprising, after the activating the power pack:
and detecting the opening and closing states of the high-speed circuit breaker, the pre-charging contactor and the line contactor, and opening all the high-speed circuit breaker, the pre-charging contactor and the line contactor in a closed state.
10. A rail vehicle, characterized by comprising the power switching system of a rail vehicle according to any one of claims 1 to 5 or employing the power switching method of a rail vehicle according to any one of claims 6 to 9 when performing power switching.
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| CN202210050621.5A CN114633640B (en) | 2022-01-17 | 2022-01-17 | Power switching system and method of railway vehicle and railway vehicle |
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| CN202210050621.5A CN114633640B (en) | 2022-01-17 | 2022-01-17 | Power switching system and method of railway vehicle and railway vehicle |
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| CN114633640B (en) | 2023-09-26 |
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