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CN109228873B - Train and train power supply system and electric leakage detection and recovery device and method thereof - Google Patents

Train and train power supply system and electric leakage detection and recovery device and method thereof Download PDF

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Publication number
CN109228873B
CN109228873B CN201710558457.8A CN201710558457A CN109228873B CN 109228873 B CN109228873 B CN 109228873B CN 201710558457 A CN201710558457 A CN 201710558457A CN 109228873 B CN109228873 B CN 109228873B
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load
power
receiving unit
power receiving
leakage
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CN109228873A (en
Inventor
郭名扬
李道林
任林
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BYD Co Ltd
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BYD Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a train and a train power supply system and a leakage detection recovery device and method thereof, wherein the leakage detection recovery device comprises: a plurality of earth leakage protection components; a plurality of first insulation detection assemblies; the controllers are used for controlling all the power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected, controlling each vehicle-mounted battery pack to supply power to at least one corresponding load, and judging the load leakage condition of the corresponding power receiving unit according to the load insulation resistance; and the vehicle control unit is used for positioning the power receiving unit with the load leakage according to the load leakage condition sent by each controller to obtain the power receiving unit without the load leakage, and sending a power grid high-voltage power-on command to the controller corresponding to the power receiving unit without the load leakage. The device can carry out the electric leakage location to the train to and the control does not take place the power supply of the electric wire netting of receiving of load electric leakage and resume, does not influence the normal operating of not taking place load electric leakage carriage.

Description

Train and train power supply system and electric leakage detection and recovery device and method thereof
Technical Field
The invention relates to the technical field of trains, in particular to a leakage detection and recovery device of a train power supply system, the train power supply system, a train and a leakage detection and recovery method of the train power supply system.
Background
At present, a train is supplied with power through a power grid, and the train cannot normally run when a high-voltage leakage fault occurs at a power grid end.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, the first objective of the present invention is to provide a leakage detection and recovery device for a train power supply system, which can locate the leakage of a train and control a power receiving unit without load leakage to recover the power supply of a power grid, without affecting the normal operation of a train car without load leakage.
The second purpose of the invention is to provide a train power supply system.
A third object of the invention is to propose a train.
The fourth purpose of the invention is to provide a leakage detection recovery method for a train power supply system.
In order to achieve the above object, a first embodiment of the present invention provides a leakage detection recovery device for a train power supply system, where the train power supply system includes a plurality of power receiving units, a power grid for supplying power to the plurality of power receiving units, each of the plurality of power receiving units includes at least one load, a first switch assembly for controlling whether the power grid supplies power to the at least one load, an on-board battery pack, and a second switch assembly for controlling whether the on-board battery pack supplies power to the at least one load, and the leakage detection recovery device includes: each leakage protection assembly is correspondingly connected between a train body of the corresponding power receiving unit and a high-voltage negative electrode of the power grid, and is used for detecting whether the train has high-voltage power leakage of the power grid or not, and triggering a first switch assembly in the corresponding power receiving unit to be disconnected and outputting a leakage signal when the train has the high-voltage power leakage of the power grid; a plurality of first insulation detection components, each of which is provided corresponding to one power receiving unit, and is configured to detect a load insulation resistance of the corresponding power receiving unit when each on-vehicle battery pack supplies power to the corresponding at least one load; the controllers are used for controlling all the power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected according to the leakage signal, enabling each vehicle-mounted battery pack to supply power to at least one corresponding load by controlling each second switch assembly to be closed, and judging the load leakage condition of the corresponding power receiving unit according to the load insulation resistance detected by each first insulation detection assembly; the vehicle control unit is used for receiving the load electric leakage condition sent by each controller, positioning the power receiving unit with the load electric leakage according to the load electric leakage condition sent by each controller to obtain the power receiving unit without the load electric leakage, and sending a power grid high-voltage power-on command to the controller corresponding to the power receiving unit without the load electric leakage, wherein after receiving the power grid high-voltage power-on command, the controller corresponding to the power receiving unit without the load electric leakage controls the first switch assembly corresponding to the power receiving unit without the load electric leakage to be closed and the second switch assembly to be opened so that the power receiving unit without the load electric leakage can restore the power supply of the power grid.
According to the leakage detection and recovery device of the train power supply system of the embodiment of the invention, each leakage protection component triggers the first switch component in the corresponding power receiving unit to be disconnected and output a leakage signal when detecting that the train has high-voltage leakage of a power grid, each first insulation detection component detects the load insulation resistance of the corresponding power receiving unit when each vehicle-mounted battery pack supplies power to the corresponding at least one load, a plurality of controllers judge that at least two first switch components are disconnected according to the leakage signal, control all the power receiving units to be disconnected from the power grid, supply power to the corresponding at least one load by controlling each second switch component, judge the load leakage condition of the corresponding power receiving unit according to the load insulation resistance detected by each first insulation detection component, and the whole vehicle controller receives the load leakage condition sent by each controller, and positioning the power receiving unit with the load leakage according to the load leakage condition sent by each controller to obtain the power receiving unit without the load leakage, and sending a power grid high-voltage power-on command to the controller corresponding to the power receiving unit without the load leakage, wherein after receiving the power grid high-voltage power-on command, the controller corresponding to the power receiving unit without the load leakage controls the first switch component corresponding to the power receiving unit without the load leakage to be closed and the second switch component to be opened so that the power receiving unit without the load leakage recovers power supply of the power grid. Therefore, the device can carry out electric leakage positioning on the train and control the power receiving unit without load electric leakage to recover power supply of the power grid, and normal operation of the carriage without load electric leakage is not influenced.
In addition, the leakage detection and recovery device for the train power supply system according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, each first switch assembly comprises: one end of the first circuit breaker is connected with a high-voltage positive pole of the power grid; one end of the first positive contactor is connected with the other end of the first breaker, and the other end of the first positive contactor is connected to the positive end of the at least one load; one end of the first negative contactor is connected with a high-voltage negative pole of the power grid, and the other end of the first negative contactor is connected to a negative pole end of the at least one load; and each electric leakage protection assembly triggers a corresponding first circuit breaker to be disconnected when detecting that the train has high-voltage electric leakage of a power grid so as to disconnect the first switch assembly in the corresponding power receiving unit.
According to one embodiment of the invention, each second switch assembly comprises: one end of the second positive contactor is connected with the positive electrode of the vehicle-mounted battery pack, and the other end of the second positive contactor is respectively connected with the other end of the first positive contactor and the positive end of the at least one load; one end of the second negative contactor is connected with the negative electrode of the vehicle-mounted battery pack, and the other end of the second negative contactor is respectively connected with the other end of the first negative contactor and the negative end of the at least one load; after all the power receiving units are controlled to be disconnected from the power grid by controlling all the first circuit breakers, the first positive contactors and the first negative contactors in the corresponding power receiving units to be disconnected, each controller in the plurality of controllers also controls the second positive contactors and the second negative contactors in the corresponding power receiving units to be closed so that each vehicle-mounted battery pack supplies power to the corresponding at least one load.
According to an embodiment of the present invention, the controller corresponding to the power receiving unit in which no load leakage occurs restores the power supply of the power grid by controlling the second positive contactor and the second negative contactor in the corresponding power receiving unit to be both opened and controlling the first circuit breaker, the first positive contactor and the first negative contactor in the corresponding power receiving unit to be all closed.
According to an embodiment of the present invention, each of the plurality of controllers is further configured to determine whether a load insulation resistance of the corresponding power receiving unit is smaller than a preset value, and determine that load leakage occurs in the corresponding power receiving unit when the load insulation resistance of the corresponding power receiving unit is smaller than the preset value.
According to an embodiment of the present invention, each of the first insulation detecting members includes: one end of the first resistor is connected with the negative electrode end of the vehicle-mounted battery pack; one end of the second resistor is connected with the train body; a first end of the first change-over switch is connected with the other end of the first resistor; a first end of the first bidirectional power supply is connected with a second end of the first change-over switch, a second end of the first bidirectional power supply is connected with a third end of the first change-over switch, and the third end and the fourth end of the first bidirectional power supply are connected and then connected to the other end of the second resistor; a first voltage detector for detecting a voltage of the first bidirectional power supply; a first current detector for detecting a forward current and a reverse current flowing through the second resistor; a first detection unit configured to calculate a load insulation resistance of a corresponding power receiving unit from a voltage of the first bidirectional power supply, a forward current and a reverse current flowing through the second resistor, and resistance values of the first resistor and the second resistor.
According to an embodiment of the present invention, the first detection unit calculates the load insulation resistance according to the following formula, wherein Rx is 2 × U1/(L1 + L2) -R1-R2, wherein Rx is the load insulation resistance, U1 is a voltage of the first bidirectional power supply, L1 and L2 are a forward current and a reverse current flowing through the second resistor, respectively, and R1 and R2 are resistance values of the first resistor and the second resistor, respectively.
According to an embodiment of the present invention, each power receiving unit further includes a DC-DC converter, a first end of the DC-DC converter is connected to the other end of the first positive contactor, a second end of the DC-DC converter is connected to the other end of the first negative contactor, a third end of the DC-DC converter is connected to the positive electrode of the on-board battery pack, a fourth end of the DC-DC converter is connected to the negative electrode of the on-board battery pack, the first end and the second end of the DC-DC converter are input ends, the third end and the fourth end of the DC-DC converter are output ends, the input ends and the output ends are isolated from each other, wherein when the power grid supplies power to the train, the power grid further charges the on-board battery pack through the DC-DC converter.
In order to achieve the above object, a second aspect of the present invention provides a train power supply system, including the leakage detection and recovery apparatus of the train power supply system according to the first aspect of the present invention.
According to the train power supply system provided by the embodiment of the invention, through the electric leakage detection and recovery device of the train power supply system, the electric leakage of the train can be positioned, and the power receiving unit without load electric leakage is controlled to recover the power supply of the power grid, so that the normal operation of the carriage without load electric leakage is not influenced.
In order to achieve the above object, a third embodiment of the present invention provides a train, including the leakage detection recovery device of the train power supply system according to the first embodiment of the present invention.
According to the train provided by the embodiment of the invention, through the electric leakage detection and recovery device of the train power supply system, electric leakage positioning can be carried out, and the power receiving unit without load electric leakage is controlled to recover power supply of a power grid, so that the normal operation of a carriage without load electric leakage is not influenced.
In order to achieve the above object, a fourth aspect of the present invention provides a leakage detection recovery method for a train power supply system, where the train power supply system includes a plurality of power receiving units and a power grid for supplying power to the plurality of power receiving units, each of the plurality of power receiving units includes at least one load, a first switch assembly for controlling whether the power grid supplies power to the at least one load, an on-board battery pack, and a second switch assembly for controlling whether the on-board battery pack supplies power to the at least one load, and the leakage detection recovery method includes: detecting whether the train has high-voltage electric leakage of the power grid through each electric leakage protection component connected between the train body of each power receiving unit and the high-voltage negative pole of the power grid; when detecting that the train has high-voltage electric leakage of a power grid, triggering a first switch assembly in a corresponding power receiving unit to be disconnected and outputting an electric leakage signal; when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal, all power receiving units are controlled to be disconnected with the power grid, each second switch assembly is controlled to enable each vehicle-mounted battery pack to supply power to at least one corresponding load, and the load insulation resistance of each power receiving unit is detected; judging the load leakage condition of each power receiving unit according to the load insulation resistance of each power receiving unit; positioning the power receiving unit with load electric leakage according to the load electric leakage condition of each power receiving unit to obtain the power receiving unit without load electric leakage, and sending a battery high-voltage power-on command to a controller corresponding to the power receiving unit without load electric leakage; and after receiving the power grid high-voltage power-on command, the controller corresponding to the power receiving unit without load leakage controls the first switch component corresponding to the power receiving unit without load leakage to be closed and the second switch component to be opened so as to enable the power receiving unit without load leakage to recover power supply of the power grid.
According to the electric leakage detection recovery method of the train power supply system, whether the train has high-voltage electric leakage or not is detected through each electric leakage protection assembly connected between the train body of each power receiving unit and the high-voltage negative electrode of the power grid, when the train has the high-voltage electric leakage, the first switch assemblies in the corresponding power receiving units are triggered to be disconnected, an electric leakage signal is output, all the power receiving units are controlled to be disconnected with the power grid when at least two first switch assemblies are judged to be disconnected according to the electric leakage signal, each vehicle-mounted battery pack supplies power to at least one corresponding load by controlling each second switch assembly, the load insulation resistance of each power receiving unit is detected, then the load electric leakage condition of each power receiving unit is judged according to the load insulation resistance of each power receiving unit, and finally the power receiving unit which has the load electric leakage is positioned according to the load electric leakage condition of each power receiving unit to obtain the electric leakage condition of the non-load And the controller corresponding to the power receiving unit without load leakage receives the power grid high-voltage power-on command and then controls the first switch component corresponding to the power receiving unit without load leakage to be switched on and switched off so as to enable the power receiving unit without load leakage to recover the power supply of the power grid. Therefore, the train can be positioned in a leakage mode, the power receiving unit without load leakage is controlled to recover power supply of the power grid, and normal operation of the compartment without load leakage is not affected.
In addition, the leakage detection and recovery method for the train power supply system provided by the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the determining the load leakage condition of each power receiving unit according to the load insulation resistance of each power receiving unit respectively comprises: judging whether the load insulation resistance of each power receiving unit is smaller than a preset value or not; and when the load insulation resistance of any power receiving unit is smaller than a preset value, judging that the power receiving unit generates load electric leakage.
According to one embodiment of the invention, each first switch assembly comprises: one end of the first circuit breaker is connected with a high-voltage positive pole of the power grid; one end of the first positive contactor is connected with the other end of the first breaker, and the other end of the first positive contactor is connected to the positive end of the at least one load; one end of the first negative contactor is connected with a high-voltage negative pole of the power grid, and the other end of the first negative contactor is connected to a negative pole end of the at least one load; and each electric leakage protection assembly triggers a corresponding first circuit breaker to be disconnected when detecting that the train has high-voltage electric leakage of a power grid so as to disconnect the first switch assembly in the corresponding power receiving unit.
According to one embodiment of the invention, each second switch assembly comprises: one end of the second positive contactor is connected with the positive electrode of the vehicle-mounted battery pack, and the other end of the second positive contactor is respectively connected with the other end of the first positive contactor and the positive end of the at least one load; one end of the second negative contactor is connected with the negative electrode of the vehicle-mounted battery pack, and the other end of the second negative contactor is respectively connected with the other end of the first negative contactor and the negative end of the at least one load; wherein, the controller that the receiving unit that does not take place load electric leakage corresponds receives after the electric wire netting high pressure power-on order through control first switch module and the second switch module that the receiving unit that does not take place load electric leakage corresponds so that the receiving unit that does not take place load electric leakage resumes the electric wire netting power supply, includes: the controller that the receiving unit that does not take place load electric leakage corresponds is all disconnected through the second positive contactor and the second negative contactor of control correspondence in the receiving unit to through the control correspond first circuit breaker, first positive contactor and the first negative contactor in the receiving unit all closed, so that the receiving unit that does not take place load electric leakage resumes the electric wire netting power supply.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,
fig. 1 is a schematic diagram of a leakage detection recovery apparatus of a train power supply system according to an embodiment of the present invention;
FIG. 2 is a circuit topology diagram of an insulation detection assembly according to one embodiment of the present invention;
fig. 3 is a flowchart of a leakage detection recovery method of a train power supply system according to an embodiment of the present invention; and
fig. 4 is a flowchart of a leakage detection recovery method for a train power supply system according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a leakage detection recovery device of a train power supply system, a train and a leakage detection positioning method of the train power supply system according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an electrical leakage detection recovery device of a train power supply system according to an embodiment of the present invention, wherein, as shown in fig. 1, the train power supply system includes a plurality of power receiving units 10, a power grid for supplying power to the plurality of power receiving units 10, each of the plurality of power receiving units 10 includes at least one load L OAD, a first switch assembly 20 for controlling whether the power grid supplies power to the at least one load L OAD, an on-board battery pack 30, a second switch assembly 40 for controlling whether the on-board battery pack 30 supplies power to the at least one load, and the electrical leakage detection recovery device includes a plurality of electrical leakage protection assemblies 50, a plurality of first insulation detection assemblies 60, a plurality of controllers 70, and a vehicle controller (not specifically shown)
Wherein each leakage protection assembly 50 of the plurality of leakage protection assemblies 50 is arranged corresponding to one power receiving unit 10, each leakage protection assembly 50 is correspondingly connected between the train body 80 of the corresponding power receiving unit 10 and the high voltage negative pole of the power grid, each leakage protection assembly 50 is used for detecting whether the train has high voltage leakage of the power grid, and triggering the first switch assembly 20 in the corresponding power receiving unit 10 to be disconnected and output a leakage signal when the train has high voltage leakage of the power grid is detected, each first insulation detection assembly 60 of the plurality of first insulation detection assemblies 60 is arranged corresponding to one power receiving unit 10, each first insulation detection assembly 60 is used for detecting the load insulation resistance Rx. of the corresponding power receiving unit 10 when each on-board battery pack 30 supplies power to the corresponding at least one load L OAD, each controller 70 is used for controlling all power receiving units 10 to be disconnected from the power grid when at least two first switch assemblies 20 are judged to be disconnected according to the leakage signal, and for controlling each second power receiving each on-board battery pack 30 to supply power to the corresponding at least one load L, and respectively receiving a leakage detection assembly 60 to control the corresponding on-line 10 to send a leakage control command to the power receiving the electrical leakage of the corresponding load 10 to obtain the electrical leakage of the electrical leakage control of the electrical leakage of the electrical grid 10, wherein the electrical leakage control unit 10 to control the electrical leakage of the electrical load 10 to control unit 10 to control the electrical leakage of the electrical grid 10 to control unit 10 to control the electrical leakage of the electrical grid.
Further, according to an embodiment of the present invention, each controller 70 of the plurality of controllers 70 is further configured to determine whether the load insulation resistance Rx of the corresponding power receiving unit 10 is smaller than a preset value, and determine that the load leakage occurs in the corresponding power receiving unit 10 when the load insulation resistance Rx of the corresponding power receiving unit 10 is smaller than the preset value. The preset value can be preset according to actual conditions.
Specifically, when the train is powered by the power grid, the positive pole of the battery pack 30 is subjected to current flow through the rigid contact rail, and the negative pole of the battery pack is subjected to current flow through the rigid contact rail, the positive pole of the battery pack 30 is insulated from the train body 80. as shown in fig. 1, taking the power receiving unit 10 as three, each power receiving unit 10 corresponds to one compartment of the train, each power receiving unit 10 includes a plurality of loads L OAD. when the train is powered by the power grid, the first switch assembly 20 is closed, the second switch assembly 40 is opened, the earth leakage protection assembly 50 can detect whether the train has high voltage electrical leakage, and trigger the first switch assembly 20 in the corresponding power receiving unit 10 to open and output an electrical leakage signal to the controller 70 when the occurrence of high voltage electrical leakage of the train is detected, if the controller 70 determines that at least two first switch assemblies 20 are opened according to the electrical leakage signal, the plurality of controllers 70 control the electrically disconnect all the power receiving units 10 from the power grid, to improve safety, and control each second switch assembly 20 to close, to supply the corresponding load L to enable the train to operate, after the second switch assembly 20 has received the electrical leakage signal, the electrical leakage control unit 70 has received the electrical leakage, the electrical leakage control unit 70 has not detected, the electrical leakage signal, the electrical leakage control unit 70 has detected, and has not sent the electrical leakage to the electrical leakage control unit 10 to determine that the electrical leakage control unit 10 has occurred, and to send the electrical leakage to the electrical leakage control unit 10 to send the electrical leakage to the electrical load not occurred to the electrical leakage to the electrical load.
In an embodiment of the present invention, as shown in fig. 1, each first switch assembly 20 may include: the first breaker HSCB, the first positive contactor KM1 and the first negative contactor KM 2.
One end of the first circuit breaker HSCB is connected to a high-voltage positive pole of a power grid, one end of the first positive contactor KM1 is connected to the other end of the first circuit breaker HSCB, and the other end of the first positive contactor KM1 is connected to a positive pole end of at least one load L OAD, one end of the first negative contactor KM2 is connected to a high-voltage negative pole of the power grid, and the other end of the first negative contactor KM2 is connected to a negative pole end of at least one load L OAD, and each leakage protection module 50 is configured to open the corresponding first circuit breaker HSCB by triggering the corresponding first switch module 20 in the corresponding power receiving unit 10 when detecting that a train has a high-voltage leakage from the power grid.
In an embodiment of the present invention, as shown in fig. 1, each second switch assembly 20 may include: a second positive contactor KM3 and a second negative contactor KM 4.
One end of the second positive contactor KM3 is connected to the positive electrode of the on-vehicle battery pack 30, the other end of the second positive contactor KM3 is connected to the other end of the first positive contactor KM1 and the positive end of the at least one load L OAD, respectively, one end of the second negative contactor KM4 is connected to the negative electrode of the on-vehicle battery pack 30, and the other end of the second negative contactor KM4 is connected to the other end of the first negative contactor KM2 and the negative end of the at least one load L OAD, respectively, after all of the power receiving units 10 are controlled to be disconnected from the grid by controlling all of the first circuit breaker HSCB, the first positive contactor KM1, and the first negative contactor KM2 in the corresponding power receiving unit 10, each of the plurality of controllers 70 further controls the second positive contactor KM3 and the second negative contactor KM4 in the corresponding power receiving unit 10 to close the on-vehicle battery pack 30 to supply power to the corresponding at least one load L OAD.
When the electric leakage protection assembly 50 detects that the power grid high-voltage leakage occurs to the train, the corresponding HSCB, KM1 and KM2 are triggered to be disconnected and a leakage signal is output to the controller 70, if the controller 70 judges that at least two first switch assemblies 20 are disconnected according to the leakage signal, all the HSCB, KM1 and KM2 are controlled to be disconnected, and each KM3 and KM4 is controlled to be closed so as to supply power to a corresponding load L OAD through the vehicle-mounted battery pack 30, so that the leakage protection is completed without influencing the normal operation of the train, and the safety is improved.
In the embodiment of the present invention, the controller 70 corresponding to the power receiving unit 10 without load leakage controls the second positive contactor KM3 and the second negative contactor KM4 in the corresponding power receiving unit 10 to be in the open state, and controls all of the first breaker HSCB, the first positive contactor KM1 and the first negative contactor KM2 in the corresponding power receiving unit 10 to be closed, so that the power receiving unit 10 without load leakage recovers the grid power supply.
That is, after the second switching element 20 is closed, the first insulation detecting element 60 detects the load insulation resistance Rx of the corresponding power receiving unit 10 and transmits it to the controller 70. The controller 70 determines whether or not a load leakage occurs in the corresponding power receiving unit 10 according to the determination load insulation resistance Rx. If the situation that the power receiving unit 10 has no load leakage is judged, corresponding KM3 and KM4 are controlled to be disconnected, and the first breaker HSCB, the first positive contactor KM1 and the first negative contactor KM2 in the corresponding power receiving unit 10 are controlled to be closed, so that the power receiving unit 10 without load leakage recovers power supply of a power grid, and normal operation of a compartment without load leakage is recovered.
According to an embodiment of the present invention, as shown in fig. 2, each of the first insulation detecting assemblies 60 may include: a first resistor r1, a second resistor r2, a first switch K1, a first bidirectional power supply 601, a first voltage detector V1, a first current detector a1, and a first detection unit 602.
The first voltage detector V1 is used for detecting the voltage U1. of the first bidirectional power supply 601, the first current detector A1 is used for detecting the forward current L and the reverse current 368 2 flowing through the second resistor R2, and the first detection unit 602 is used for calculating the resistance Rx of the insulation load unit Rx 2 according to the voltage U1 of the first bidirectional power supply, the forward current L and the reverse current L flowing through the second resistor R2, the first resistor R1 and the resistance R2 of the first resistor R1 and the second resistor R4642.
The first detection unit 602 calculates the load insulation resistance Rx according to the following formula (1):
Figure BDA0001346438810000091
wherein Rx is an insulation resistance, U1 is a voltage of the first bi-directional power supply 601, L1 and L2 are a forward current and a reverse current respectively flowing through the second resistor R2, and R1 and R2 are resistances of the first resistor R1 and the second resistor R2 respectively.
Specifically, the voltage U1 of the first bi-directional power supply 601 may be detected by the first voltage detector V1, and the forward current L1 and the reverse current L2 passing through the second resistor R2 may be detected by the first current detector a1 the first detection unit 602 may calculate the load insulation resistance Rx through equation (1) according to the voltage U1 of the first bi-directional power supply, the forward current L1 and the reverse current L1 passing through the second resistor R2, and the resistance values R1 and R2 of the first resistor R1 and the second resistor R2, and transmit Rx to the controller 70, so that the controller 70 determines whether load leakage occurs to the corresponding power receiving unit 10 according to Rx.
According to an embodiment of the present invention, as shown in fig. 1, each power receiving unit 10 may further include a DC-DC converter 90. The first end of the DC-DC converter 90 is connected with the other end of the first positive contactor K1, the second end of the DC-DC converter 90 is connected with the other end of the first negative contactor K2, the third end of the DC-DC converter 90 is connected with the positive pole of the vehicle-mounted battery pack 30, the fourth end of the DC-DC converter 90 is connected with the negative pole of the vehicle-mounted battery pack 30, the first end and the second end of the DC-DC converter 90 are input ends, the third end and the fourth end of the DC-DC converter 90 are output ends, and the input ends and the output ends are mutually isolated, wherein when the power grid supplies power to the train, the power grid also charges the vehicle-mounted battery pack 30 through the DC-DC converter 90.
Specifically, the DC-DC converter 90 can isolate the high-voltage loops on the grid side and the vehicle-mounted battery pack 30 side from each other, and when the first switch assembly 20 and the second switch assembly 40 are closed, the grid can also charge the vehicle-mounted battery pack 30 through the DC-DC converter 90.
In an embodiment of the invention, the train may be a straddle monorail train.
In summary, according to the leakage detection and recovery apparatus of a train power supply system in an embodiment of the present invention, each leakage protection component triggers a first switch component in a corresponding power receiving unit to be turned off and output a leakage signal when detecting that a high voltage leakage of a power grid occurs in a train, each first insulation detection component detects a load insulation resistance of the corresponding power receiving unit when each on-board battery pack supplies power to a corresponding at least one load, a plurality of controllers determine, according to the leakage signal, that at least two first switch components are turned off, control all the power receiving units to be turned off from the power grid, and enable each on-board battery pack to supply power to a corresponding at least one load by controlling each second switch component, and determine, according to the load insulation resistance detected by each first insulation detection component, a load leakage condition of the corresponding power receiving unit, and the vehicle controller receives the load leakage condition sent by each controller, and positioning the power receiving unit with the load leakage according to the load leakage condition sent by each controller to obtain the power receiving unit without the load leakage, and sending a power grid high-voltage power-on command to the controller corresponding to the power receiving unit without the load leakage, wherein after receiving the power grid high-voltage power-on command, the controller corresponding to the power receiving unit without the load leakage controls the first switch component corresponding to the power receiving unit without the load leakage to be closed and the second switch component to be opened so that the power receiving unit without the load leakage recovers power supply of the power grid. Therefore, the device can carry out electric leakage positioning on the train and control the power receiving unit without load electric leakage to recover power supply of the power grid, and normal operation of the carriage without load electric leakage is not influenced.
The embodiment of the invention also provides a train power supply system which comprises the electric leakage detection and recovery device of the train power supply system.
According to the train power supply system provided by the embodiment of the invention, through the electric leakage detection and recovery device of the train power supply system, the electric leakage of the train can be positioned, and the power receiving unit without load electric leakage is controlled to recover the power supply of the power grid, so that the normal operation of the carriage without load electric leakage is not influenced.
The embodiment of the invention also provides a train, which comprises the electric leakage detection and recovery device of the train power supply system. Wherein the train may be a straddle monorail train.
According to the train provided by the embodiment of the invention, through the electric leakage detection and recovery device of the train power supply system, electric leakage positioning can be carried out, and the power receiving unit without load electric leakage is controlled to recover power supply of a power grid, so that the normal operation of a carriage without load electric leakage is not influenced.
Fig. 3 is a flowchart of a leakage detection recovery method for a train power supply system according to an embodiment of the present invention. As shown in fig. 1, the train power supply system includes a plurality of power receiving units, a power grid for supplying power to the plurality of power receiving units, each power receiving unit in the plurality of power receiving units includes at least one load, a first switch assembly for controlling whether the power grid supplies power to the at least one load, an on-board battery pack, and a second switch assembly for controlling whether the on-board battery pack supplies power to the at least one load; as shown in fig. 3, the leakage detecting and positioning method includes the following steps:
and S1, detecting whether the train has high-voltage electric leakage of the power grid through each electric leakage protection component connected between the train body of each power receiving unit and the high-voltage negative pole of the power grid.
And S2, when detecting that the high-voltage electric leakage of the power grid occurs to the train, triggering the first switch assembly in the corresponding power receiving unit to be disconnected, and outputting an electric leakage signal.
And S3, controlling all the power receiving units to be disconnected from the power grid when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal, controlling each second switch assembly to enable each vehicle-mounted battery pack to supply power to the corresponding at least one load, and detecting the load insulation resistance Rx of each power receiving unit.
S4, determining the load leakage condition of each power receiving unit according to the load insulation resistance Rx of each power receiving unit.
In the embodiment of the present invention, as shown in fig. 4, the determining the load leakage condition of each power receiving unit according to the load insulation resistance Rx of each power receiving unit includes:
s401, determine whether the load insulation resistance Rx of each power receiving unit is smaller than a preset value. The preset value can be preset according to actual conditions.
S402, when the load insulation resistance Rx of any power receiving unit is smaller than a preset value, it is determined that the power receiving unit has a load leakage.
And S5, positioning the power receiving unit with the load leakage according to the load leakage condition of each power receiving unit to obtain the power receiving unit without the load leakage, and sending a power grid high-voltage power-on command to the controller corresponding to the power receiving unit without the load leakage.
And S6, after receiving the power grid high-voltage power-on command, the controller corresponding to the power receiving unit without load leakage controls the first switch assembly and the second switch assembly corresponding to the power receiving unit without load leakage so as to recover the power supply of the power grid.
Specifically, when the power grid for the train supplies power, the positive electrode receives current through the rigid contact rail, and the negative electrode reflows through the rigid contact rail. The positive and negative poles of the vehicle-mounted battery are insulated from the train body. Each power receiving unit corresponds to one compartment of the train, and each power receiving unit comprises a plurality of loads. When the train is powered by a power grid, whether the train has high-voltage power grid leakage or not is detected through the leakage protection assembly, and when the train has high-voltage power grid leakage, the first switch assembly in the corresponding power receiving unit is triggered to be disconnected and a leakage signal is output. And if the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal, all the power receiving units are controlled to be disconnected from the power grid, and each second switch assembly is controlled to be closed so as to supply power to the corresponding load through the vehicle-mounted battery pack, so that the train can normally run. After the second switch assembly is closed, detecting load insulation resistance Rx of the corresponding power receiving unit, judging whether the load insulation resistance Rx of each power receiving unit is smaller than a preset value, and if the load insulation resistance Rx of any power receiving unit is smaller than the preset value, judging that the power receiving unit generates load electric leakage, namely judging that the high-voltage loop of the vehicle-mounted battery pack generates electric leakage. And then, positioning the power receiving unit with the load electric leakage according to the load electric leakage condition sent by each controller to obtain the power receiving unit without the load electric leakage, and sending a power grid high-voltage power-on command to the controller corresponding to the power receiving unit without the load electric leakage. After the controller corresponding to the power receiving unit without load leakage receives a power grid high-voltage power-on command, the controller controls the first switch assembly to be closed and the second switch assembly to be opened, so that the power receiving unit without load leakage recovers power supply of a power grid. Therefore, the method can perform electric leakage positioning on the train, control the power receiving unit without load electric leakage to recover power supply of the power grid, and does not influence the normal operation of the carriage without load electric leakage.
According to an embodiment of the present invention, as shown in fig. 1, each of the first switch assemblies may include: the first circuit breaker, first positive contactor, first negative contactor.
One end of the first breaker is connected with a high-voltage positive pole of a power grid, one end of the first positive contactor is connected with the other end of the first breaker, and the other end of the first positive contactor is connected to a positive pole end of at least one load. One end of the first negative contactor is connected with a high-voltage negative pole of the power grid, and the other end of the first negative contactor is connected to a negative pole end of at least one load. Each electric leakage protection assembly triggers the corresponding first circuit breaker to be disconnected when detecting that the high-voltage electric leakage of the power grid occurs to the train, so that the first switch assembly in the corresponding power receiving unit is disconnected.
In an embodiment of the present invention, as shown in fig. 1, each of the second switch assemblies may include: a second positive contactor and a second negative contactor.
One end of the second positive contactor is connected with the positive pole of the vehicle-mounted battery pack, and the other end of the second positive contactor is connected with the other end of the first positive contactor and the positive pole end of the at least one load respectively. One end of the second negative contactor is connected with the negative pole of the vehicle-mounted battery pack, and the other end of the second negative contactor is connected with the other end of the first negative contactor and the negative pole end of the at least one load respectively. The controller that the power receiving unit that does not take place load electric leakage corresponds receives the electric wire netting high pressure and goes up electric command back through first switch module and the second switch module that the power receiving unit that control does not take place load electric leakage corresponds so that the power receiving unit that does not take place load electric leakage resumes the electric wire netting power supply, includes: the controller corresponding to the power receiving unit without load leakage controls the second positive contactor and the second negative contactor in the corresponding power receiving unit to be both opened, and controls the first breaker, the first positive contactor and the first negative contactor in the corresponding power receiving unit to be all closed, so that the power receiving unit without load leakage can recover power supply of a power grid.
Specifically, after the second switch element is closed, the first insulation detection element detects the load insulation resistance Rx of the corresponding power receiving unit, and sends the load insulation resistance Rx to the controller. The controller judges whether the corresponding power receiving unit has the load leakage condition according to the judgment load insulation resistance Rx. And if the situation that the corresponding power receiving unit does not generate load leakage is judged, the corresponding second positive contactor and the second negative contactor are controlled to be disconnected, and the first breaker, the first positive contactor and the first negative contactor in the corresponding power receiving unit are controlled to be closed completely, so that the power receiving unit without load leakage recovers the power supply of the power grid, and the normal operation of the compartment without load leakage is recovered.
In an embodiment of the invention, the train may be a straddle monorail train.
To sum up, according to the leakage detection and recovery method of the train power supply system in the embodiment of the present invention, whether a high voltage leakage of a power grid occurs in a train is detected by each leakage protection assembly connected between a train body of each power receiving unit and a high voltage negative electrode of the power grid, when it is detected that the high voltage leakage of the power grid occurs in the train, the first switch assembly in the corresponding power receiving unit is triggered to be turned off, a leakage signal is output, it is determined according to the leakage signal that all the power receiving units are turned off when at least two first switch assemblies are turned off, each on-board battery pack supplies power to at least one corresponding load by controlling each second switch assembly, and a load insulation resistance of each power receiving unit is detected, then, a load leakage condition of each power receiving unit is determined according to the load insulation resistance of each power receiving unit, and finally, the power receiving unit with the load leakage is positioned according to the load leakage condition of each power receiving unit to And the controller corresponding to the power receiving unit without load leakage receives the power grid high-voltage power-on command and then controls the first switch component corresponding to the power receiving unit without load leakage to be switched on and switched off so as to enable the power receiving unit without load leakage to recover the power supply of the power grid. Therefore, the train can be positioned in a leakage mode, the power receiving unit without load leakage is controlled to recover power supply of the power grid, and normal operation of the compartment without load leakage is not affected.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (14)

1. An electric leakage detection and recovery device for a train power supply system, wherein the train power supply system comprises a plurality of power receiving units, a power grid for supplying power to the power receiving units, each power receiving unit in the power receiving units comprises at least one load, a first switch assembly for controlling whether the power grid supplies power to the at least one load, an on-board battery pack, a second switch assembly for controlling whether the on-board battery pack supplies power to the at least one load, and the electric leakage detection and recovery device comprises:
each leakage protection assembly is correspondingly connected between a train body of the corresponding power receiving unit and a high-voltage negative electrode of the power grid, and is used for detecting whether the train has high-voltage power leakage of the power grid or not, and triggering a first switch assembly in the corresponding power receiving unit to be disconnected and outputting a leakage signal when the train has the high-voltage power leakage of the power grid;
a plurality of first insulation detection components, each of which is provided corresponding to one power receiving unit, and is configured to detect a load insulation resistance of the corresponding power receiving unit when each on-vehicle battery pack supplies power to the corresponding at least one load;
the controllers are used for controlling all the power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected according to the leakage signal, controlling each second switch assembly to enable each vehicle-mounted battery pack to supply power to at least one corresponding load, and judging the load leakage condition of the corresponding power receiving unit according to the load insulation resistance detected by each first insulation detection assembly;
the vehicle control unit is used for receiving the load electric leakage condition sent by each controller, positioning the power receiving unit with load electric leakage according to the load electric leakage condition sent by each controller to obtain the power receiving unit without load electric leakage, and sending a power grid high-voltage power-on command to the controller corresponding to the power receiving unit without load electric leakage, wherein,
and after receiving the power grid high-voltage power-on command, the controller corresponding to the power receiving unit without load leakage controls the first switch assembly and the second switch assembly corresponding to the power receiving unit without load leakage so as to recover the power supply of the power grid.
2. The electrical leakage detection recovery apparatus for a train power supply system according to claim 1, wherein each of the first switch assemblies includes:
one end of the first circuit breaker is connected with a high-voltage positive pole of the power grid;
one end of the first positive contactor is connected with the other end of the first breaker, and the other end of the first positive contactor is connected to the positive end of the at least one load;
one end of the first negative contactor is connected with a high-voltage negative pole of the power grid, and the other end of the first negative contactor is connected to a negative pole end of the at least one load;
and each electric leakage protection assembly triggers a corresponding first circuit breaker to be disconnected when detecting that the train has high-voltage electric leakage of a power grid so as to disconnect the first switch assembly in the corresponding power receiving unit.
3. The electrical leakage detection recovery apparatus for a train power supply system according to claim 2, wherein each of the second switch assemblies includes:
one end of the second positive contactor is connected with the positive electrode of the vehicle-mounted battery pack, and the other end of the second positive contactor is respectively connected with the other end of the first positive contactor and the positive end of the at least one load;
one end of the second negative contactor is connected with the negative electrode of the vehicle-mounted battery pack, and the other end of the second negative contactor is respectively connected with the other end of the first negative contactor and the negative end of the at least one load;
after all the power receiving units are controlled to be disconnected from the power grid by controlling all the first circuit breakers, the first positive contactors and the first negative contactors in the corresponding power receiving units to be disconnected, each controller in the plurality of controllers also controls the second positive contactors and the second negative contactors in the corresponding power receiving units to be closed so that each vehicle-mounted battery pack supplies power to the corresponding at least one load.
4. The electrical leakage detection and recovery device for a train electrical power supply system according to claim 3, wherein the controller corresponding to the electrical power receiving unit in which no electrical leakage occurs is configured to control the second positive contactor and the second negative contactor in the corresponding electrical power receiving unit to be both opened, and control the first circuit breaker, the first positive contactor and the first negative contactor in the corresponding electrical power receiving unit to be all closed, so that the electrical power receiving unit in which no electrical leakage occurs is configured to recover the grid electrical power supply.
5. The electrical leakage detection and recovery apparatus for a train power supply system according to any one of claims 1 to 4, wherein each of the plurality of controllers is further configured to determine whether or not a load insulation resistance of a corresponding power receiving unit is smaller than a preset value, and determine that load leakage occurs in the corresponding power receiving unit when the load insulation resistance of the corresponding power receiving unit is smaller than the preset value.
6. The electrical leakage detection recovery apparatus for a train power supply system according to claim 1, wherein each of the first insulation detection units comprises:
one end of the first resistor is connected with the negative electrode end of the vehicle-mounted battery pack;
one end of the second resistor is connected with the train body;
a first end of the first change-over switch is connected with the other end of the first resistor;
a first end of the first bidirectional power supply is connected with a second end of the first change-over switch, a second end of the first bidirectional power supply is connected with a third end of the first change-over switch, and the third end and the fourth end of the first bidirectional power supply are connected and then connected to the other end of the second resistor;
a first voltage detector for detecting a voltage of the first bidirectional power supply;
a first current detector for detecting a forward current and a reverse current flowing through the second resistor;
a first detection unit configured to calculate a load insulation resistance of a corresponding power receiving unit from a voltage of the first bidirectional power supply, a forward current and a reverse current flowing through the second resistor, and resistance values of the first resistor and the second resistor.
7. The electrical leakage detection recovery apparatus for a train power supply system according to claim 6, wherein the first detection unit calculates the load insulation resistance according to the following formula:
Rx＝2*U1/(L1+L2)-R1-R2
wherein Rx is the load insulation resistor, U1 is the voltage of the first bidirectional power supply, L1 and L2 are the forward current and the reverse current flowing through the second resistor, respectively, and R1 and R2 are the resistances of the first resistor and the second resistor, respectively.
8. The electrical leakage detection recovery apparatus for a train power supply system according to claim 3, each power receiving unit further comprises a DC-DC converter, a first end of the DC-DC converter is connected with the other end of the first positive contactor, the second end of the DC-DC converter is connected with the other end of the first negative contactor, the third end of the DC-DC converter is connected with the anode of the vehicle-mounted battery pack, the fourth end of the DC-DC converter is connected with the cathode of the vehicle-mounted battery pack, the first end and the second end of the DC-DC converter are input ends, the third end and the fourth end of the DC-DC converter are output ends, the input ends and the output ends are isolated from each other, when the power grid supplies power to the train, the power grid also charges the vehicle-mounted battery pack through the DC-DC converter.
9. A train power supply system characterized by comprising the electric leakage detection recovery device of the train power supply system according to any one of claims 1 to 8.
10. A train characterized by comprising a leak detection recovery device of a train power supply system according to any one of claims 1 to 8.
11. An electric leakage detection recovery method for a train power supply system, wherein the train power supply system includes a plurality of power receiving units and a power grid for supplying power to the plurality of power receiving units, each of the plurality of power receiving units includes at least one load, a first switch assembly for controlling whether the power grid supplies power to the at least one load, an on-board battery pack, and a second switch assembly for controlling whether the on-board battery pack supplies power to the at least one load, and the electric leakage detection recovery method includes the steps of:
detecting whether the train has high-voltage electric leakage of the power grid through each electric leakage protection component connected between the train body of each power receiving unit and the high-voltage negative pole of the power grid;
when detecting that the train has high-voltage electric leakage of a power grid, triggering a first switch assembly in a corresponding power receiving unit to be disconnected and outputting an electric leakage signal;
when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal, all power receiving units are controlled to be disconnected with the power grid, each second switch assembly is controlled to enable each vehicle-mounted battery pack to supply power to at least one corresponding load, and the load insulation resistance of each power receiving unit is detected;
judging the load leakage condition of each power receiving unit according to the load insulation resistance of each power receiving unit;
positioning the power receiving unit with load electric leakage according to the load electric leakage condition of each power receiving unit to obtain the power receiving unit without load electric leakage, and sending a power grid high-voltage power-on command to a controller corresponding to the power receiving unit without load electric leakage;
and after receiving the power grid high-voltage power-on command, the controller corresponding to the power receiving unit without load leakage controls the first switch component corresponding to the power receiving unit without load leakage to be closed and the second switch component to be opened so as to enable the power receiving unit without load leakage to recover power supply of the power grid.
12. The electrical leakage detection and recovery method according to claim 11, wherein the determining the load electrical leakage condition of each power receiving unit according to the load insulation resistance of each power receiving unit comprises:
judging whether the load insulation resistance of each power receiving unit is smaller than a preset value or not;
and when the load insulation resistance of any power receiving unit is smaller than a preset value, judging that the power receiving unit generates load electric leakage.
13. The leakage detection recovery method according to claim 11 or 12, wherein each first switch component comprises:
one end of the first circuit breaker is connected with a high-voltage positive pole of the power grid;
one end of the first positive contactor is connected with the other end of the first breaker, and the other end of the first positive contactor is connected to the positive end of the at least one load;
one end of the first negative contactor is connected with a high-voltage negative pole of the power grid, and the other end of the first negative contactor is connected to a negative pole end of the at least one load;
and each electric leakage protection assembly triggers a corresponding first circuit breaker to be disconnected when detecting that the train has high-voltage electric leakage of a power grid so as to disconnect the first switch assembly in the corresponding power receiving unit.
14. The leakage detection recovery method according to claim 13, wherein each of the second switch assemblies comprises:
one end of the second positive contactor is connected with the positive electrode of the vehicle-mounted battery pack, and the other end of the second positive contactor is respectively connected with the other end of the first positive contactor and the positive end of the at least one load;
one end of the second negative contactor is connected with the negative electrode of the vehicle-mounted battery pack, and the other end of the second negative contactor is respectively connected with the other end of the first negative contactor and the negative end of the at least one load;
wherein, the controller that the receiving unit that does not take place load electric leakage corresponds receives after the electric wire netting high pressure power-on order through control first switch module and the second switch module that the receiving unit that does not take place load electric leakage corresponds so that the receiving unit that does not take place load electric leakage resumes the electric wire netting power supply, includes:
the controller that the receiving unit that does not take place load electric leakage corresponds is all disconnected through the second positive contactor and the second negative contactor of control correspondence in the receiving unit to through the control correspond first circuit breaker, first positive contactor and the first negative contactor in the receiving unit all closed, so that the receiving unit that does not take place load electric leakage resumes the electric wire netting power supply.
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