WO2023050517A1 - Système de traction à accumulation d'énergie et procédé de commande associé, et véhicule de transport ferroviaire - Google Patents

Système de traction à accumulation d'énergie et procédé de commande associé, et véhicule de transport ferroviaire Download PDF

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Publication number
WO2023050517A1
WO2023050517A1 PCT/CN2021/127244 CN2021127244W WO2023050517A1 WO 2023050517 A1 WO2023050517 A1 WO 2023050517A1 CN 2021127244 W CN2021127244 W CN 2021127244W WO 2023050517 A1 WO2023050517 A1 WO 2023050517A1
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Prior art keywords
traction
energy storage
control switch
power
power supply
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PCT/CN2021/127244
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English (en)
Chinese (zh)
Inventor
蒋奉兵
张宾
李学明
张义
刘清
毛康鑫
何维
朱宇龙
徐江辉
李敏
熊煜宇
Original Assignee
株洲中车时代电气股份有限公司
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Publication of WO2023050517A1 publication Critical patent/WO2023050517A1/fr

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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
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
    • B60L9/24—Electric propulsion with power supply external to the vehicle using ac induction motors fed from ac supply lines
    • B60L9/28—Electric propulsion with power supply external to the vehicle using ac induction motors fed from ac supply lines polyphase motors
    • 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
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Definitions

  • the disclosure belongs to the technical field of rail transportation, and in particular relates to an energy storage type traction system, a control method thereof, and a rail transportation tool.
  • Rail transit trains EMUs, passenger/freight electric locomotives
  • EMUs passenger/freight electric locomotives
  • Rail transit trains can continue to maintain traction in areas without grids if they can not only meet the requirements of the grid power supply system but also have their own energy storage equipment (such as batteries, supercapacitors, fuel cells, etc.) This can not only improve the efficiency of train transportation, but also improve the availability of trains. At the same time, it also has the advantages of greenness and environmental protection. It is an important development trend in the field of rail transit in the world.
  • the traction function of the energy storage equipment is added to the rail transit train, it is usually considered to add a DC/DC link in the intermediate DC circuit of the traction conversion equipment to realize energy storage and power supply.
  • the DC/DC link often adopts a circuit without isolation.
  • the intermediate voltage level of the traction conversion equipment must depend on the rated insulation voltage of the energy storage equipment. If the intermediate voltage level of the traction conversion equipment needs to be increased, the rated insulation voltage of the energy storage equipment must be increased, thereby increasing the volume and weight of the energy storage equipment. and cost key indicators.
  • the main purpose of the present disclosure is to provide an energy storage type traction system and its control method and a rail vehicle, so as to solve the problem that the energy storage device and the intermediate DC unit of the traction converter device are directly connected in the same circuit when the grid power supply system is used.
  • the intermediate voltage level of the traction conversion equipment must depend on the rated insulation voltage of the energy storage equipment. If the intermediate voltage level of the traction conversion equipment needs to be increased, the rated insulation voltage of the energy storage equipment must be increased, thereby increasing the volume and weight of the energy storage equipment. Issues with key metrics of cost.
  • the present disclosure provides a control method for an energy storage traction system.
  • the energy storage traction system includes a grid power supply, a traction transformer, a four-quadrant rectifier, an intermediate DC unit, an auxiliary inverter, a traction inverter, a storage functional equipment, a bidirectional AC/DC converter, a first control switch, a second control switch, a third control switch and a fourth control switch;
  • the grid power supply, traction transformer, first control switch, four-quadrant rectifier, and intermediate DC unit are connected in sequence.
  • the output end of the intermediate DC unit is connected to the auxiliary load through the auxiliary inverter, and the output end of the intermediate DC unit is also connected to the auxiliary load through the traction inverter.
  • the traction motor is connected;
  • the energy storage device, the second control switch, the bidirectional AC/DC converter and the auxiliary load are connected in sequence; the energy storage device is also connected to the secondary winding of the traction transformer through the third control switch; the energy storage device is also connected to the secondary winding of the traction transformer through the fourth control switch.
  • the output terminals of the intermediate DC unit are connected;
  • the control method of the energy storage traction system includes:
  • the power supply mode of the energy storage traction system is grid power supply, and the bidirectional AC/DC converter is not faulty, control the first control switch and the second control switch to close, control the third control switch and the fourth control switch to open so that the AC power of the grid power supply is stepped down by the traction transformer, and then the intermediate DC unit is boosted by the four-quadrant rectifier, and the traction voltage obtained by inverting the traction inverter supplies power to the traction motor, and the auxiliary inverter The load voltage obtained by the inverter supplies power to the auxiliary load;
  • the bidirectional AC/DC converter If the charging request sent by the energy storage device is detected, start the bidirectional AC/DC converter, so that the bidirectional AC/DC converter can rectify the load voltage to obtain the charging voltage, and use the charging voltage to charge the energy storage device;
  • the bidirectional AC/DC converter If the power supply mode of the energy storage traction system is power supply for energy storage equipment, and the bidirectional AC/DC converter is not faulty, control the first control switch to open, and control the second switch, the third control switch and the fourth control switch to close , and start the bidirectional AC/DC converter, so that the DC power of the energy storage device will be uncontrolled rectified by the four-quadrant rectifier after passing through the secondary winding of the traction transformer, supplying power to the intermediate DC unit, and reversed by the traction inverter
  • the obtained traction voltage supplies power to the traction motor, and the bidirectional AC/DC converter inverts the direct current of the energy storage device to obtain the load voltage to supply power to the auxiliary load.
  • the present disclosure also provides an energy storage type traction system, including a grid power supply, a traction transformer, a four-quadrant rectifier, an intermediate DC unit, an auxiliary inverter, a traction inverter, an energy storage device, a bidirectional AC/DC converter, a first control switch, a second control switch, a third control switch and a fourth control switch;
  • the grid power supply, traction transformer, first control switch, four-quadrant rectifier, and intermediate DC unit are connected in sequence.
  • the output end of the intermediate DC unit is connected to the auxiliary load through the auxiliary inverter, and the output end of the intermediate DC unit is also connected to the auxiliary load through the traction inverter.
  • the traction motor is connected;
  • the energy storage device, the second control switch, the bidirectional AC/DC converter and the auxiliary load are connected in sequence; the energy storage device is also connected to the secondary winding of the traction transformer through the third control switch; the energy storage device is also connected to the secondary winding of the traction transformer through the fourth control switch.
  • the output terminals of the intermediate DC unit are connected;
  • the power supply mode of the energy storage traction system is grid power supply, and the bidirectional AC/DC converter is not faulty, the first control switch and the second control switch are closed, the third control switch and the fourth control switch are opened, and After the AC power of the power grid is stepped down by the traction transformer, the intermediate DC unit is boosted by the four-quadrant rectifier, and the traction voltage obtained by inversion by the traction inverter supplies power to the traction motor, and the auxiliary inverter performs inversion The resulting load voltage supplies power to the auxiliary load;
  • the bidirectional AC/DC converter If the charging request is sent by the energy storage device, start the bidirectional AC/DC converter, so that the bidirectional AC/DC converter can rectify the load voltage to obtain the charging voltage, and use the charging voltage to charge the energy storage device;
  • the first control switch is turned off, the second switch, the third control switch and the fourth control switch are closed, And start the bidirectional AC/DC converter, so that the direct current of the energy storage device will be rectified by the four-quadrant rectifier after passing through the secondary winding of the traction transformer, and the intermediate DC unit will be powered, and the traction inverter will be used for inversion
  • the obtained traction voltage supplies power to the traction motor, and the bidirectional AC/DC converter inverts the direct current of the energy storage device to obtain the load voltage to supply power to the auxiliary load.
  • the present disclosure also provides a rail vehicle, including the above-mentioned energy storage type traction system.
  • the above-mentioned rail vehicle includes at least one of a motor vehicle, a locomotive and an engineering vehicle.
  • FIG. 1 is a topological diagram of a grid-powered traction system in the related art
  • Fig. 2 is a topological diagram of an energy storage traction system in the related art
  • Fig. 3 is a topological diagram of an embodiment of the energy storage traction system of the present disclosure
  • Fig. 4 is a working flow chart of the energy storage traction system when the grid power supply is powered under normal working conditions
  • Fig. 5 is a working flow chart of the energy storage type traction system when the energy storage device supplies power under normal working conditions
  • FIG. 6 is an equivalent circuit diagram when a bidirectional AC/DC converter fails in the energy storage traction system of the present disclosure
  • Fig. 7 is the working flow diagram of the energy storage type traction system when the grid power supplies power under the fault condition
  • Fig. 8 is a working flow diagram of the energy storage traction system when the energy storage device supplies power under fault conditions
  • Fig. 9 is a topological diagram of another embodiment of the energy storage traction system of the present disclosure.
  • Fig. 10 is the working flow diagram of the energy storage type traction system when the storage power supply is used for power supply under normal working conditions;
  • Fig. 11 is a working flow chart of the energy storage traction system when the depot is powered by the power supply under fault conditions.
  • FIG 1 is a topology diagram of the traction system of the grid power supply system in the related art.
  • the EMU or electric locomotive is usually powered by the grid power supply system (such as 25kV/50Hz), and the main circuit schematic diagram of the traction system is shown in the figure 1, the traction converter device 12 adopts the main and auxiliary integrated structure.
  • the single-phase 25kV/50Hz alternating current passes through the pantograph and the circuit breaker to the traction transformer 11, and after being stepped down by the traction transformer 11, it supplies power to the traction converter 12 through the secondary winding.
  • the traction converter 12 first charges the intermediate DC unit 122 through the pre-charging component 121, then starts the four-quadrant rectifier (Four-Quadrant Converter, 4QC) to raise the intermediate voltage to a stable value, and then passes the traction inverter (Inverter, INV)
  • the three-phase alternating current with adjustable output voltage and frequency enables the traction motor to obtain the desired torque and speed.
  • auxiliary inverter Auxiliary Inverter, AINV
  • auxiliary transformer auxiliary transformer, filter, etc.
  • FIG. 2 shows the related technology. Topology diagram of the energy storage traction system. As shown in FIG. 2 , the energy storage device 15 is connected to the intermediate DC circuit through a DC/DC link 16 .
  • the DC/DC link 16 In order to reduce the volume of the energy storage device 15, the DC/DC link 16 often adopts a circuit without isolation. However, in this way, the energy storage device 15 is directly connected to the intermediate DC unit 122 of the traction conversion device 12 in the grid power supply system. In the same circuit, the intermediate voltage level of the traction conversion device 12 must depend on the rated insulation voltage of the energy storage device 15. If the intermediate voltage level of the traction conversion device 12 needs to be increased, the rated insulation voltage of the energy storage device 15 must be increased, thereby The key indicators of the volume, weight and cost of the energy storage device 15 are added.
  • the present disclosure provides the following technical solutions.
  • FIG. 3 is a topological diagram of an embodiment of the energy storage traction system of the present disclosure. As shown in FIG. Inverter AINV, traction inverter INV, energy storage device 15, bidirectional AC/DC converter 17, first control switch QS1, second control switch QS2, third control switch QS3 and fourth control switch QS4.
  • the grid power supply 10, the traction transformer 11, the first control switch QS1, the four-quadrant rectifier 4QC, and the intermediate DC unit 122 are connected in sequence, and the output terminal of the intermediate DC unit 122 is connected to the auxiliary load through the auxiliary inverter AINV
  • the output end of the intermediate DC unit 122 is also connected to the traction motor through the traction inverter INV.
  • the energy storage device 15, the second control switch QS2, the bidirectional AC/DC converter 17 and the auxiliary load are connected in sequence; the energy storage device 15 is also connected to the secondary winding of the traction transformer 11 through the third control switch QS3; the energy storage device 15 It is also connected to the output terminal of the intermediate DC unit 122 through the fourth control switch QS4.
  • the present disclosure also provides a control method for the energy storage traction system. It includes the following steps a to c.
  • Step a If the power supply mode of the energy storage traction system is the grid power supply 10, and the bidirectional AC/DC converter 17 is not faulty, control the first control switch QS1 and the second control switch QS2 to close, and control the third control switch QS3 and the fourth control switch QS4 are disconnected, so that the AC power of the grid power supply 10 is stepped down by the traction transformer 11, and then the intermediate DC unit 122 is boosted by the four-quadrant rectifier 4QC, and the traction inverter INV performs inversion to obtain the The traction voltage supplies power to the traction motor, and the load voltage obtained through inversion by the auxiliary inverter AINV supplies power to the auxiliary load.
  • the AC power of the grid power supply 10 is stepped down by the traction transformer 11 to supply power to the traction converter device 12 through the secondary winding, and the four-quadrant rectification module of the traction converter device 12 raises the intermediate voltage to a certain set point. constant voltage.
  • the traction inverter INV start the traction inverter INV output voltage, three-phase alternating current with adjustable frequency, so that the traction motor can obtain the desired torque and speed to drive the train, or when the train brakes, the traction inverter INV reverses the braking energy Feedback to the intermediate DC unit 122, and then feed back to the grid through the four-quadrant rectification module of the traction conversion device 12; on the other hand, the auxiliary inverter AINV will be started to output auxiliary power to supply power for auxiliary loads.
  • Step b If the charging request sent by the energy storage device 15 is detected, start the bidirectional AC/DC converter 17, so that the bidirectional AC/DC converter 17 rectifies the load voltage to obtain a charging voltage, and then uses the charging voltage to charge the storage device.
  • the device 15 can be charged.
  • the energy storage device 15 monitors its own power condition in real time, and sends a charging request when it needs to be charged.
  • the energy storage device 15 is charged after the charging voltage is obtained through rectification.
  • Step c If the power supply mode of the energy storage traction system is to supply power to the energy storage device 15, and the bidirectional AC/DC converter 17 does not fail, control the first control switch QS1 to turn off, and control the second switch and the third control switch QS3 and the fourth control switch QS4 are closed, and start the bidirectional AC/DC converter 17, so that after the direct current of the energy storage device 15 passes through the secondary winding of the traction transformer 11, the four-quadrant rectifier 4QC performs uncontrolled rectification, and the intermediate
  • the DC unit 122 supplies power, and the traction voltage obtained by inverting the traction inverter INV supplies power to the traction motor, and the bidirectional AC/DC converter 17 inverts the DC power of the energy storage device 15 to obtain a load voltage for the auxiliary load powered by.
  • the DC power of the energy storage device 15 passes through the 11th side winding of the traction transformer on the one hand, and then passes through the four-quadrant rectifier 4QC for uncontrolled rectification to supply power to the intermediate DC circuit, so that the four-quadrant rectifier 4QC does not operate, and there is no need to
  • the secondary side winding of the traction transformer 11 is chopped, so the heat dissipation is less and the loss is also less, and the use of these devices is safer.
  • the traction inverter INV reversely feeds the braking energy to
  • the intermediate DC unit 122 will reversely charge the energy storage device 15 through the four-quadrant rectifier 4QC; on the other hand, it will start the bidirectional AC/DC converter 17, and output three-phase alternating current through "reverse" inverter to supply power for the auxiliary load.
  • the energy storage traction system further includes a pre-charging component 121; the traction transformer 11 and the energy storage device 15 are respectively connected to the four-quadrant rectifier 4QC through the pre-charging component 121 .
  • the intermediate DC unit 122 before the intermediate DC unit 122 is boosted by the four-quadrant rectifier 4QC, or, before the four-quadrant rectifier 4QC performs uncontrolled rectification and supplies power to the intermediate DC unit 122, it further includes: Cell 122 is precharged.
  • control method of the energy storage type traction system may also perform the following steps: if the power supply mode of the energy storage type traction system supplies power to the grid power supply 10, the traction inverter INV provides reverse For the braking force, use the four-quadrant rectifier 4QC to invert the braking voltage corresponding to the reverse braking force, and feed it back to the grid power supply 10 .
  • control method of the energy storage type traction system may further perform the following steps: if the power supply mode of the energy storage type traction system supplies power to the energy storage device 15, the traction inverter INV provides a reverse For the braking force, use the four-quadrant rectifier 4QC to step down the braking voltage corresponding to the reverse braking force, and after obtaining the charging voltage, use the charging voltage to charge the energy storage device 15 .
  • a bidirectional AC/DC converter 17 that takes power from an auxiliary inverter AINV with a lower voltage level is provided, and the energy storage device 15, the third control switch QS3 , the secondary winding of the traction transformer 11; connect the energy storage device 15, the fourth control switch QS4, and the output end of the intermediate DC unit 122, and connect the energy storage device 15, the second control switch QS2, the bidirectional AC/DC, the auxiliary inverter
  • the output end of the inverter AINV is connected to realize the positive charging of the energy storage device 15 and the reverse power supply for the auxiliary load, and the isolation link can be canceled, which saves the volume and weight of the energy storage extended-range traction system and the main circuit is simple to implement.
  • the intermediate voltage level of the traction converter device 12 must depend on the rated voltage of the energy storage device 15 In terms of insulation voltage, the rated insulation voltage of the energy storage device 15 does not need to depend on the voltage level of the intermediate DC unit 122 of the traction converter, which is more conducive to the miniaturization and weight reduction of the energy storage device 15 or the power and voltage level of the traction converter promote.
  • Fig. 4 is a working flow chart of the energy storage traction system when the power grid is powered under normal working conditions. As shown in FIG. 4 , the working process of the energy storage traction system may include the following steps 400 to 413 .
  • Step 400 the grid power supply 10 supplies power.
  • Step 401 pre-charging link.
  • Step 402 the four-quadrant rectifier 4QC starts.
  • Step 403 start the traction inverter INV.
  • Step 404 output traction force.
  • Step 405 pulling the train to run.
  • Step 406 braking the train.
  • Step 407 exert braking force.
  • Step 408 start the auxiliary inverter AINV.
  • Step 409 the auxiliary load starts to work.
  • Step 410 whether the energy storage device 15 satisfies the charging condition, if yes, execute step 411 , if not, execute step 413 .
  • Step 411 the bidirectional AC/DC converter 17 starts.
  • Step 412 the energy storage device 15 starts charging.
  • Step 413 the energy storage device 15 is not charged.
  • step 403 and the execution order of step 408 are in no particular order.
  • Fig. 5 is a working flow chart of the energy storage traction system when the energy storage device supplies power under normal working conditions. As shown in FIG. 5 , the working process of the energy storage traction system may include the following steps 500 to 509 .
  • Step 500 the energy storage device 15 supplies power.
  • Step 501 pre-charging link.
  • Step 502 the four-quadrant rectifier 4QC does not control the rectification.
  • Step 503 start the traction inverter INV.
  • Step 504 output traction force.
  • Step 505 pulling the train to run.
  • Step 506 braking the train.
  • Step 507 exert braking force.
  • Step 508 the bidirectional AC/DC module starts.
  • Step 509 the auxiliary load starts to work.
  • step 501 and the execution order of step 508 are not in any order.
  • Fig. 6 is an equivalent circuit diagram when the bidirectional AC/DC converter in the energy storage traction system of the present disclosure fails.
  • the control method for the energy storage traction system of this embodiment may also perform the following steps a1 to b1.
  • Step a1 if the power supply mode of the energy storage traction system is the grid power supply 10, and the bidirectional AC/DC converter 17 fails, control the first control switch QS1 to close, control the third control switch QS3 and the fourth control switch QS4 Disconnect, so that after the AC power of the grid power supply 10 is stepped down by the traction transformer 11, the intermediate DC unit 122 is boosted by the four-quadrant rectifier 4QC, and the traction voltage obtained by inverting the traction inverter INV supplies power to the traction motor , the load voltage obtained through inversion by the auxiliary inverter AINV supplies power to the auxiliary load.
  • Step b1 If the power supply mode of the energy storage traction system is the energy storage device 15, and the bidirectional AC/DC converter 17 fails, control the first control switch QS1 to turn off, control the third control switch QS3 and the fourth control switch The switch QS4 is closed, so that the direct current of the energy storage device 15 passes through the secondary winding of the traction transformer 11, and then is choppered and boosted by the four-quadrant rectifier 4QC to supply power to the intermediate DC unit 122, and is inverted by the traction inverter INV
  • the obtained traction voltage supplies power to the traction motor, and the load voltage obtained through inversion by the auxiliary inverter AINV supplies power to the auxiliary load.
  • the DC power of the energy storage device 15 passes through the 11th side winding of the traction transformer, and then the pre-charging link of the traction converter charges the intermediate DC circuit, and then passes through the four-quadrant rectifier 4QC bidirectional DC/DC "forward"
  • the chopper boost supplies power to the intermediate DC circuit (the chopper reactor is the leakage inductance of the 11th side winding of the traction transformer).
  • the traction inverter INV start the traction inverter INV output voltage, three-phase alternating current with adjustable frequency, so that the traction motor can obtain the desired torque and speed to drive the train, or when the train brakes, the traction inverter INV reverses the braking energy Feedback to the intermediate DC unit 122 and then through the four-quadrant rectifier 4QC bidirectional DC/DC "reverse" step-down to charge the energy storage device 15; on the other hand, the auxiliary inverter AINV will be started to output auxiliary power to supply power for auxiliary loads.
  • Fig. 7 is a working flow chart of the energy storage traction system when the grid power supplies power under fault conditions. As shown in FIG. 7 , the working process of the energy storage traction system may include the following steps 700 to 709 .
  • Step 700 the grid power supply 10 supplies power.
  • Step 701 pre-charging link.
  • Step 702 the four-quadrant rectifier 4QC starts.
  • Step 703 start the traction inverter INV.
  • Step 704 output traction force.
  • Step 705 pulling the train to run.
  • Step 706 braking the train.
  • Step 707 exert braking force.
  • Step 708 start the auxiliary inverter AINV.
  • Step 709 the auxiliary load starts to work.
  • step 703 and the execution order of step 708 are in no particular order.
  • Fig. 8 is a working flow chart of the energy storage traction system when the energy storage device supplies power under fault conditions. As shown in FIG. 8 , the working process of the energy storage traction system may include steps 800 to 809 as follows.
  • Step 800 the energy storage device 15 supplies power.
  • Step 801 pre-charging link.
  • Step 802 bidirectional DC/DC chopping by the four-quadrant rectifier 4QC.
  • Step 803 start the traction inverter INV.
  • Step 804 output traction force.
  • Step 805 pulling the train to run.
  • Step 806 braking the train.
  • Step 807 exert braking force.
  • Step 808 start the auxiliary inverter AINV.
  • Step 809 the auxiliary load starts to work.
  • step 803 is not in any order of execution order of step 808 .
  • Fig. 9 is a topological diagram of another embodiment of the energy storage traction system of the present disclosure. As shown in FIG. 9 , the energy storage traction system further includes a storage power supply 18 . The storage power supply 18 is connected to the auxiliary load.
  • control method of the energy storage traction system of this embodiment may also perform the following steps a2 to b2.
  • Step a2 If the power supply mode of the energy storage traction system is the power supply 18 for the warehouse, and the bidirectional AC/DC converter 17 is not faulty, control the first control switch QS1 and the second control switch QS2 to close, and control the third control switch The switch QS3 and the fourth control switch QS4 are disconnected, and the auxiliary inverter AINV and the traction inverter INV are started, so that the AC power of the storage power supply 18 supplies power to the auxiliary load, and the AC power of the storage power supply 18 is auxiliary inverted After rectified and boosted by the inverter AINV, the intermediate DC unit 122 is powered, and the traction motor is powered by the traction voltage obtained through inversion by the traction inverter INV.
  • the power supply 18 for the warehouse directly supplies power to the auxiliary load; for example, after receiving the instruction of the motor car for the warehouse, the auxiliary inverter AINV is started, and the intermediate voltage is raised to A certain set voltage, and then start the traction inverter INV output voltage, three-phase alternating current with adjustable frequency, so that the traction motor can obtain the desired torque and speed to traction the train.
  • Step b2 if the charging request sent by the energy storage device 15 is detected, start the bidirectional AC/DC converter 17, so that the bidirectional AC/DC converter 17 can rectify the AC power of the storage power supply 18 to obtain the charging voltage, then use The charging voltage charges the energy storage device 15 .
  • the bidirectional AC/DC module when the energy storage device 15 sends a charging request command, the bidirectional AC/DC module is activated to charge the energy storage unit through "forward" 3 AC/DC rectification.
  • control method of the energy storage traction system of this embodiment may also perform the following steps a3 to b3.
  • Step a3 If the power supply mode of the energy storage traction system is the power supply 18 for the warehouse, and the bidirectional AC/DC converter 17 fails, control the first control switch QS1 to turn off, control the third control switch QS3 and the fourth control switch The switch QS4 is closed, and the auxiliary inverter AINV and the traction inverter INV are started, so that the AC power of the storage power supply 18 supplies power to the auxiliary load, and the AC power of the storage power supply 18 is rectified and boosted by the auxiliary inverter AINV , to supply power to the intermediate DC unit 122, and to supply power to the traction motor with the traction voltage obtained through inversion by the traction inverter INV.
  • the storage power supply 18 can still directly supply power to the auxiliary load; at the same time, the auxiliary inverter module is started, and the intermediate voltage is raised to a certain set voltage after being rectified and boosted by three-phase four-terminal PWM. For example, after receiving the depot motor car order, start the traction inverter module output voltage, three-phase alternating current with adjustable frequency, so that the traction motor can obtain the desired torque and speed to drive the train.
  • Step b3 If the charging request sent by the energy storage device 15 is detected, the DC power of the intermediate DC unit 122 is stepped down by the four-quadrant rectifier 4QC to obtain a charging voltage, and the energy storage device 15 is charged using the charging voltage.
  • the energy storage unit after the energy storage unit sends a charge request command, the energy storage unit is charged through the bidirectional DC/DC step-down of the four-quadrant module.
  • Fig. 10 is a working flow chart of the energy storage type traction system when the storage power supply 18 supplies power under normal working conditions. As shown in FIG. 10 , the working process of the energy storage traction system may include the following steps 100 to 1011 .
  • Step 100 the library supplies power with the power supply 18 .
  • Step 101 the auxiliary load starts to work.
  • Step 102 whether there is a traction instruction, if there is a traction instruction, execute step 103, if there is no traction instruction, execute step 1011.
  • Step 103 start the auxiliary inverter AINV.
  • Step 104 start the traction inverter INV.
  • Step 105 output traction force.
  • Step 106 pulling the train to run.
  • Step 107 whether the energy storage device 15 meets the charging condition, if the energy storage device 15 meets the charging condition, execute step 108, if the energy storage device 15 does not meet the charging condition, execute step 1010.
  • Step 108 the bidirectional AC/DC converter 17 starts.
  • Step 109 the energy storage device 15 starts charging.
  • Step 1010 the energy storage device 15 is not charged.
  • Step 1011 the auxiliary inverter AINV is not started.
  • step 101 the execution order of step 101, the execution order of step 102, and the execution order of step 108 are not in any order.
  • Fig. 11 is a working flow chart of the energy storage traction system when the warehouse power supply 18 supplies power under fault conditions. As shown in FIG. 11 , the working process of the energy storage traction system may include the following steps 110 to 1111 .
  • Step 110 the library supplies power with the power supply 18 .
  • Step 111 the auxiliary load starts to work.
  • Step 112 start the auxiliary inverter module.
  • Step 113 whether there is a traction instruction, if there is a traction instruction, execute step 114 , if there is no traction instruction, execute step 117 .
  • Step 114 start the traction inverter INV.
  • Step 115 output traction force.
  • Step 116 pulling the train to run.
  • Step 117 the auxiliary inverter AINV is not started.
  • Step 118 whether the energy storage device 15 meets the charging condition, if the energy storage device 15 meets the charging condition, execute step 119 , if the energy storage device 15 does not meet the charging condition, execute step 1111 .
  • Step 119 chopping by the four-quadrant rectifier 4QCDC/DC.
  • Step 1110 the energy storage device 15 starts charging.
  • Step 1111 the energy storage device 15 is not charged.
  • the present disclosure also provides a rail vehicle, including the energy storage traction system of the above embodiment.
  • the rail vehicle may include at least one of a train, a locomotive and an engineering vehicle.
  • the energy storage type traction system and its control method and rail vehicle of the present disclosure by setting a bidirectional AC/DC converter that takes power from an auxiliary inverter with a lower voltage level, the energy storage device, the third control switch , the secondary winding of the traction transformer; connect the output of the energy storage device, the fourth control switch, and the intermediate DC unit, and connect the output of the energy storage device, the second control switch, the bidirectional AC/DC, and the auxiliary inverter , it can charge the energy storage device in the forward direction and supply power to the auxiliary load in the reverse direction, and the isolation link can be canceled, which saves the volume and weight of the energy storage extended-range traction system.
  • the main circuit is simple to implement and has good engineering application value.
  • the intermediate voltage level of the traction conversion equipment must depend on the rated insulation voltage of the energy storage equipment, and the rated insulation voltage of the energy storage equipment does not need Relying on the voltage level of the intermediate DC unit of the traction converter is more conducive to the miniaturization and weight reduction of energy storage equipment or the improvement of the power and voltage level of the traction converter.
  • the present disclosure realizes charging the energy storage device in the forward direction and reversely supplying power to the auxiliary load.
  • the energy storage device and the auxiliary inverter are connected in the same circuit, and the rated insulation voltage of the energy storage device does not need to depend on the voltage of the intermediate DC unit. It is more conducive to the miniaturization and weight reduction of energy storage equipment or the improvement of power and voltage levels of traction converters.
  • references to the terms “one embodiment,” “some embodiments,” “example,” “specific examples,” or “some examples” means that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present disclosure.
  • schematic representations of the above terms do not necessarily refer to the same embodiment or example.
  • the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Abstract

La présente invention concerne un système de traction à accumulation d'énergie et un procédé de commande associé, et un véhicule de transport ferroviaire. Le système comprend une source d'alimentation de réseau électrique, un transformateur de traction, un redresseur à quatre quadrants, une unité à courant continu intermédiaire, un onduleur auxiliaire, un onduleur de traction, un dispositif d'accumulation d'énergie, un convertisseur CA/CC bidirectionnel, un premier commutateur de commande, un deuxième commutateur de commande, un troisième commutateur de commande et un quatrième commutateur de commande, le dispositif d'accumulation d'énergie, le troisième commutateur de commande et un enroulement secondaire du transformateur de traction étant connectés ; le dispositif d'accumulation d'énergie, le quatrième commutateur de commande et une extrémité de sortie de l'unité à courant continu intermédiaire sont connectés ; et le dispositif d'accumulation d'énergie, le deuxième commutateur de commande, le convertisseur CA/CC bidirectionnel et une extrémité de sortie de l'onduleur auxiliaire sont connectés.
PCT/CN2021/127244 2021-09-30 2021-10-29 Système de traction à accumulation d'énergie et procédé de commande associé, et véhicule de transport ferroviaire WO2023050517A1 (fr)

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