CN111532146B - Non-net self-walking energy storage and unidirectional AC/DC converter system for rail transit - Google Patents
Non-net self-walking energy storage and unidirectional AC/DC converter system for rail transit Download PDFInfo
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- CN111532146B CN111532146B CN202010331438.3A CN202010331438A CN111532146B CN 111532146 B CN111532146 B CN 111532146B CN 202010331438 A CN202010331438 A CN 202010331438A CN 111532146 B CN111532146 B CN 111532146B
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- lithium titanate
- battery pack
- titanate battery
- unidirectional
- contactor
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- 238000004146 energy storage Methods 0.000 title claims abstract description 50
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 130
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 130
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 130
- 238000004891 communication Methods 0.000 claims abstract description 25
- 238000009413 insulation Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000012423 maintenance Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims description 25
- 238000012545 processing Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 6
- 230000006855 networking Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
-
- 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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/007—Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/04—Cutting off the power supply under fault conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a non-network self-walking energy storage and unidirectional AC/DC conversion system for rail traffic, which comprises a first lithium titanate battery pack, a positive electrode fuse, a voltage sensor, an insulation detection module, a current sensor, a positive electrode contactor, a traction power supply output interface, a unidirectional AC/DC converter, an AC380V power supply interface, a negative electrode fuse, a negative electrode contactor, a manual maintenance switch, a BMS battery management system, a communication and control interface, a pre-charging contactor, a pre-charging resistor and a second lithium titanate battery pack. The principle is to store electric energy in the lithium titanate battery pack, when the vehicle needs to put into the energy storage system, the vehicle sends a put-in signal, and after the BMS receives the starting signal, the BMS controls the positive contactor and the negative contactor in the energy storage system to be closed, and power is supplied to the vehicle traction system through the traction power supply output interface. When the normal power supply system of the vehicle is restored, the unidirectional AC/DC converter rectifies the AC380V power supply into direct current to charge the lithium titanate battery pack.
Description
Technical Field
The invention relates to the crossing fields of rail transit power supply technology, current transformation technology and energy storage technology, in particular to a non-network self-walking energy storage and unidirectional AC/DC current transformation system for rail transit.
Background
The non-network self-walking system for rail transit combines the rail transit power supply and current transformation technology with the lithium titanate battery energy storage technology to form an independent system which is arranged at the bottom of a city rail and a motor car, and when the normal power failure of the car occurs, the car is controlled to be put into the non-network self-walking energy storage and unidirectional AC/DC current transformation system to realize the non-network self-walking of the car.
Rail transit such as subway and motor train is considered as the most green traffic mode with characteristics such as large traffic volume, fast speed, safety, environmental protection, energy saving. The power supply system of the vehicle is particularly important because of large traffic volume and low driving interval. At present, most subway vehicles mainly rely on external power supply of a contact net or a third rail, and when an external power supply fails, the vehicles only wait for rescue. However, each year, there is a case of operation interruption of the subway line caused by an external power supply fault, and the subway station with large traffic volume can gather passengers of a plurality of vehicles, which causes adverse effects on normal operation of public transportation. Therefore, the demand of the vehicle network-free self-running can be more and more urgent under the emergency that the external power supply of the train is paralyzed on the basis of the vehicle-mounted energy storage device operation in each city. However, the vehicle-mounted energy storage batteries for the rail transit vehicles are generally lead-acid and cadmium-nickel batteries, and the batteries have the characteristics of short service life, environmental protection, memory effect, difficult maintenance and the like. Therefore, the invention is a safe, reliable and environment-friendly netless self-walking energy storage and unidirectional AC/DC converter system.
The invention is proved by various tests, and explosion and fire can not happen under various conditions of the test verification, so that the invention is absolutely safe and reliable.
The invention can realize the net-free self-running of the vehicle, and the cycle life is more than 10000 times.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a non-net self-walking energy storage and unidirectional AC/DC converter system for rail transit. The system comprises a butt joint interface with the rail transit vehicle, and can provide electric energy according to the requirement. The invention aims to provide a network-free self-walking power supply for rail transit vehicles.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A networked self-propelled energy storage and unidirectional AC/DC conversion system for rail transit, comprising: the lithium titanate battery pack I1, a positive electrode fuse 2, a voltage sensor 3, an insulation detection module 4, a current sensor 5, a positive electrode contactor 6, a traction power supply output interface 7, a unidirectional AC/DC converter 8, an AC380V power supply interface 9, a negative electrode fuse 10, a negative electrode contactor 11, a manual maintenance switch 12, a BMS battery management system 13, a communication control interface 14, a pre-charging contactor 15, a pre-charging resistor 16 and a lithium titanate battery pack II 17;
the positive electrode of the first lithium titanate battery pack 1 is connected with one end of the positive electrode fuse 2; the other end of the positive electrode fuse 2 is respectively connected with one end of the voltage sensor 3, a positive electrode monitoring interface of the insulation detection module 4 and one end of the current sensor 5; the other end of the current sensor 5 is respectively connected with one end of the positive electrode contactor 6 and one end of the pre-charging contactor 15; the other end of the precharge contactor 15 is connected with one end of a precharge resistor 16; the other end of the positive contactor 6 is connected with the other end of the pre-charging resistor 16 and then is respectively connected with the traction power supply output interface 7 and the positive electrode of the direct current side of the unidirectional AC/DC converter 8; the alternating current side of the unidirectional AC/DC converter 8 is connected with an AC380V power interface 9;
The negative electrode of the second lithium titanate battery pack 17 is connected with one end of the negative electrode fuse 10; the other end of the negative electrode fuse 10 is respectively connected with one end of the negative electrode contactor 11, the other end of the voltage sensor 3 and a negative electrode monitoring interface of the insulation detection module 4; the other end of the negative electrode contactor 11 is respectively connected with the traction power supply output interface 7 and the direct-current side negative electrode of the unidirectional AC/DC converter 8; the negative electrode of the first lithium titanate battery pack 1 is connected with the positive electrode of the second lithium titanate battery pack 17 through a manual maintenance switch 12; the BMS battery management system 13 is connected with the communication and control interface 14, and the BMS battery management system 13 is also connected with the voltage sensor 3, the insulation detection module 4, the current sensor 5, the positive electrode contactor 6, the negative electrode contactor 11, the pre-charging contactor 15 and the lithium titanate battery pack II 17 respectively;
the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 are used for storing electric energy and supplying the electric energy to a traction system of the rail transit vehicle through the traction power supply output interface 7;
The positive electrode fuse 2 is used for overload and short-circuit protection of a loop of the non-network self-walking energy storage and unidirectional AC/DC converter system;
The voltage sensor 3 is used for sampling and processing the positive voltage of the first lithium titanate battery pack 1 and the negative voltage of the second lithium titanate battery pack 17, then transmitting voltage signals to the BMS battery management system 13, and the BMS battery management system 13 is used for analyzing and monitoring the received voltage signals and then carrying out fault judgment and early warning;
The insulation monitoring module 4 is used for monitoring the insulation state between the positive electrode of the first lithium titanate battery pack 1 and the ground of the negative electrode of the second lithium titanate battery pack 17, and if the insulation monitoring value does not meet the power-on requirement, the BMS battery management system 13 disconnects the positive electrode contactor 6 and the negative electrode contactor 11;
The current sensor 5 is used for sampling and processing charge and discharge currents of the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17, then transmitting current signals to the BMS battery management system 13, and the BMS battery management system 13 is used for monitoring and recording the received current signals and then judging and early warning faults;
the positive electrode contactor 6 and the negative electrode contactor 11 are used for performing power-on and power-off control on the non-network self-walking energy storage and unidirectional AC/DC conversion system, and the BMS battery management system 13 is used for controlling the closing and opening of the positive electrode contactor 6 and the negative electrode contactor 11 so as to realize the power-on and power-off control on the non-network self-walking energy storage and unidirectional AC/DC conversion system;
The traction power supply output interface 7 is used for being connected with a traction system of the rail transit vehicle, so that electric energy stored by the non-network self-walking energy storage and unidirectional AC/DC conversion system is supplied to the traction system of the rail transit vehicle through the traction power supply output interface 7;
The unidirectional AC/DC converter 8 is used for requesting charging by the BMS battery management system 13 through the communication and control interface 14 when the network voltage of the rail transit vehicle is normal and the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 are fed or need to be charged, and the unidirectional AC/DC converter 8 takes an AC380V power supply as input and outputs a direct current power supply to charge the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17;
The AC380V power interface 9 is used as an interface between the non-network self-propelled energy storage and unidirectional AC/DC converter system and an AC380V alternating current bus of the rail transit vehicle, and when the rail transit vehicle needs to charge the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17, the rail transit vehicle charges the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 through the AC380V power interface 9;
the negative electrode fuse 10 is used for overload and short-circuit protection of a loop of the non-network self-walking energy storage and unidirectional AC/DC converter system;
the manual maintenance switch 12 is used for effectively disconnecting a circuit between the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 when the non-network self-walking energy storage and unidirectional AC/DC converter system is overhauled, so that the safety of overhaulers is ensured;
The BMS battery management system 13 is configured to monitor states of the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17, ensure that the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 are in a healthy working state, control closing and opening of the pre-charge contactor 15, the positive electrode contactor 6 and the negative electrode contactor 11 according to the states of the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17, and monitor states of the pre-charge contactor 15, the positive electrode contactor 6 and the negative electrode contactor 11; the system is used for communicating with a TCMS of a rail transit vehicle through a communication and control interface 14, reporting the states of a self-propelled energy storage and unidirectional AC/DC conversion system without a network in real time, and charging a first lithium titanate battery pack 1 and a second lithium titanate battery pack 17 according to a charging strategy; the system is used for monitoring and diagnosing the networking self-walking energy storage and unidirectional AC/DC converter system through the communication and control interface 14; the battery management system is used for receiving the current signal sent by the current sensor 5 and the voltage signal sent by the voltage sensor 3, analyzing and processing the current and voltage signals, judging whether to charge and discharge according to the current and voltage requested by the BMS battery management system 13, if the current and voltage signals exceed the protection limit value requested by the BMS battery management system 13, the BMS battery management system 13 can protect, and the current and voltage are required to be reduced or reduced, and even the positive contactor 6 and the negative contactor 11 are cut off;
The communication and control interface 14 is used for being connected with a communication interface of the TCMS of the rail transit vehicle for data transmission and control; the communication and control interface 14 is also used for providing a DC110V working power supply for the BMS battery management system 13;
the pre-charge contactor 15 and the pre-charge resistor 16 are used for pre-charging the filter capacitor on the DC side of the unidirectional AC/DC converter 8.
On the basis of the scheme, the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 have both power characteristics and energy characteristics, and are more suitable for occasions with limited vehicle installation space and increased networking self-walking functions.
Based on the above scheme, the unidirectional AC/DC converter 8 charges the lithium titanate battery pack 1 and the lithium titanate battery pack 17 in a constant current step-down charging manner, the BMS battery management system 13 sends a charging mode and a charging current and voltage value, and the unidirectional AC/DC converter 8 charges according to a request instruction of the BMS battery management system 13.
On the basis of the scheme, the pre-charging contactor 15 and the pre-charging resistor 16 can pre-charge the unidirectional AC/DC converter 8, so that impact current caused by the power-on of the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 is avoided.
Based on the above scheme, the manual maintenance switch 12 plays a role of isolating the power supply and dividing the voltage.
On the basis of the scheme, the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 directly supply power to a traction system of the rail transit vehicle, DC/DC boost conversion is not needed, and hardware cost is saved.
According to the technical scheme, the non-network self-running of the rail transit vehicle can be realized, the battery adopts a lithium titanate battery, and a Battery Management System (BMS) is configured, so that the BMS can monitor the state of the storage battery energy storage system in real time. Not only the reliability of power supply is increased, but also the safety of the vehicle is enhanced. The system also integrates a unidirectional AC/DC converter, and the integration level is higher. The invention is suitable for various rail transit vehicles, and is safe and reliable.
Drawings
The invention has the following drawings:
Figure 1 is a block diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a non-net self-walking energy storage and unidirectional AC/DC conversion system for rail transit, comprising: the lithium titanate battery pack I1, a positive electrode fuse 2, a voltage sensor 3, an insulation detection module 4, a current sensor 5, a positive electrode contactor 6, a traction power supply output interface 7, a unidirectional AC/DC converter 8, an AC380V power supply interface 9, a negative electrode fuse 10, a negative electrode contactor 11, a manual maintenance switch 12, a BMS battery management system 13, a communication control interface 14, a pre-charging contactor 15, a pre-charging resistor 16 and a lithium titanate battery pack II 17;
the positive electrode of the first lithium titanate battery pack 1 is connected with one end of the positive electrode fuse 2; the other end of the positive electrode fuse 2 is respectively connected with one end of the voltage sensor 3, a positive electrode monitoring interface of the insulation detection module 4 and one end of the current sensor 5; the other end of the current sensor 5 is respectively connected with one end of the positive electrode contactor 6 and one end of the pre-charging contactor 15; the other end of the precharge contactor 15 is connected with one end of a precharge resistor 16; the other end of the positive contactor 6 is connected with the other end of the pre-charging resistor 16 and then is respectively connected with the traction power supply output interface 7 and the positive electrode of the direct current side of the unidirectional AC/DC converter 8; the alternating current side of the unidirectional AC/DC converter 8 is connected with an AC380V power interface 9;
The negative electrode of the second lithium titanate battery pack 17 is connected with one end of the negative electrode fuse 10; the other end of the negative electrode fuse 10 is respectively connected with one end of the negative electrode contactor 11, the other end of the voltage sensor 3 and a negative electrode monitoring interface of the insulation detection module 4; the other end of the negative electrode contactor 11 is respectively connected with the traction power supply output interface 7 and the direct-current side negative electrode of the unidirectional AC/DC converter 8; the negative electrode of the first lithium titanate battery pack 1 is connected with the positive electrode of the second lithium titanate battery pack 17 through a manual maintenance switch 12; the BMS battery management system 13 is connected with the communication and control interface 14, and the BMS battery management system 13 is also connected with the voltage sensor 3, the insulation detection module 4, the current sensor 5, the positive electrode contactor 6, the negative electrode contactor 11, the pre-charging contactor 15 and the lithium titanate battery pack II 17 respectively;
the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 are used for storing electric energy and supplying the electric energy to a traction system of the rail transit vehicle through the traction power supply output interface 7;
The positive electrode fuse 2 is used for overload and short-circuit protection of a loop of the non-network self-walking energy storage and unidirectional AC/DC converter system;
The voltage sensor 3 is used for sampling and processing the positive voltage of the first lithium titanate battery pack 1 and the negative voltage of the second lithium titanate battery pack 17, then transmitting voltage signals to the BMS battery management system 13, and the BMS battery management system 13 is used for analyzing and monitoring the received voltage signals and then carrying out fault judgment and early warning;
The insulation monitoring module 4 is used for monitoring the insulation state between the positive electrode of the first lithium titanate battery pack 1 and the ground of the negative electrode of the second lithium titanate battery pack 17, and if the insulation monitoring value does not meet the power-on requirement, the BMS battery management system 13 disconnects the positive electrode contactor 6 and the negative electrode contactor 11;
The current sensor 5 is used for sampling and processing charge and discharge currents of the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17, then transmitting current signals to the BMS battery management system 13, and the BMS battery management system 13 is used for monitoring and recording the received current signals and then judging and early warning faults;
the positive electrode contactor 6 and the negative electrode contactor 11 are used for performing power-on and power-off control on the non-network self-walking energy storage and unidirectional AC/DC conversion system, and the BMS battery management system 13 is used for controlling the closing and opening of the positive electrode contactor 6 and the negative electrode contactor 11 so as to realize the power-on and power-off control on the non-network self-walking energy storage and unidirectional AC/DC conversion system;
The traction power supply output interface 7 is used for being connected with a traction system of the rail transit vehicle, so that electric energy stored by the non-network self-walking energy storage and unidirectional AC/DC conversion system is supplied to the traction system of the rail transit vehicle through the traction power supply output interface 7;
The unidirectional AC/DC converter 8 is used for requesting charging by the BMS battery management system 13 through the communication and control interface 14 when the network voltage of the rail transit vehicle is normal and the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 are fed or need to be charged, and the unidirectional AC/DC converter 8 takes an AC380V power supply as input and outputs a direct current power supply to charge the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17;
The AC380V power interface 9 is used as an interface between the non-network self-propelled energy storage and unidirectional AC/DC converter system and an AC380V alternating current bus of the rail transit vehicle, and when the rail transit vehicle needs to charge the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17, the rail transit vehicle charges the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 through the AC380V power interface 9;
the negative electrode fuse 10 is used for overload and short-circuit protection of a loop of the non-network self-walking energy storage and unidirectional AC/DC converter system;
the manual maintenance switch 12 is used for effectively disconnecting a circuit between the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 when the non-network self-walking energy storage and unidirectional AC/DC converter system is overhauled, so that the safety of overhaulers is ensured;
The BMS battery management system 13 is configured to monitor states of the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17, ensure that the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 are in a healthy working state, control closing and opening of the pre-charge contactor 15, the positive electrode contactor 6 and the negative electrode contactor 11 according to the states of the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17, and monitor states of the pre-charge contactor 15, the positive electrode contactor 6 and the negative electrode contactor 11; the system is used for communicating with a TCMS of a rail transit vehicle through a communication and control interface 14, reporting the states of a self-propelled energy storage and unidirectional AC/DC conversion system without a network in real time, and charging a first lithium titanate battery pack 1 and a second lithium titanate battery pack 17 according to a charging strategy; the system is used for monitoring and diagnosing the networking self-walking energy storage and unidirectional AC/DC converter system through the communication and control interface 14; the battery management system is used for receiving the current signal sent by the current sensor 5 and the voltage signal sent by the voltage sensor 3, analyzing and processing the current and voltage signals, judging whether to charge and discharge according to the current and voltage requested by the BMS battery management system 13, if the current and voltage signals exceed the protection limit value requested by the BMS battery management system 13, the BMS battery management system 13 can protect, and the current and voltage are required to be reduced or reduced, and even the positive contactor 6 and the negative contactor 11 are cut off;
The communication and control interface 14 is used for being connected with a communication interface of the TCMS of the rail transit vehicle for data transmission and control; the communication and control interface 14 is also used for providing a DC110V working power supply for the BMS battery management system 13;
the pre-charge contactor 15 and the pre-charge resistor 16 are used for pre-charging the filter capacitor on the DC side of the unidirectional AC/DC converter 8.
On the basis of the scheme, the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 have both power characteristics and energy characteristics, and are more suitable for occasions with limited vehicle installation space and increased networking self-walking functions.
Based on the above scheme, the unidirectional AC/DC converter 8 charges the lithium titanate battery pack 1 and the lithium titanate battery pack 17 in a constant current step-down charging manner, the BMS battery management system 13 sends a charging mode and a charging current and voltage value, and the unidirectional AC/DC converter 8 charges according to a request instruction of the BMS battery management system 13.
On the basis of the scheme, the pre-charging contactor 15 and the pre-charging resistor 16 can pre-charge the unidirectional AC/DC converter 8, so that impact current caused by the power-on of the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 is avoided.
Based on the above scheme, the manual maintenance switch 12 plays a role of isolating the power supply and dividing the voltage.
On the basis of the scheme, the first lithium titanate battery pack 1 and the second lithium titanate battery pack 17 directly supply power to a traction system of the rail transit vehicle, DC/DC boost conversion is not needed, and hardware cost is saved.
According to the technical scheme, the non-network self-running of the rail transit vehicle can be realized, the battery adopts a lithium titanate battery, and a Battery Management System (BMS) is configured, so that the BMS can monitor the state of the storage battery energy storage system in real time. Not only the reliability of power supply is increased, but also the safety of the vehicle is enhanced. The system also integrates a unidirectional AC/DC converter, and the integration level is higher. The invention is suitable for various rail transit vehicles, and is safe and reliable.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (6)
1. The utility model provides a no net is from walking energy storage and one-way AC/DC conversion system for track traffic which characterized in that includes: the lithium titanate battery pack comprises a first lithium titanate battery pack (1), a positive electrode fuse (2), a voltage sensor (3), an insulation detection module (4), a current sensor (5), a positive electrode contactor (6), a traction power supply output interface (7), a unidirectional AC/DC converter (8), an AC380V power interface (9), a negative electrode fuse (10), a negative electrode contactor (11), a manual maintenance switch (12), a BMS battery management system (13), a communication control interface (14), a pre-charging contactor (15), a pre-charging resistor (16) and a second lithium titanate battery pack (17);
the positive electrode of the first lithium titanate battery pack (1) is connected with one end of the positive electrode fuse (2); the other end of the positive electrode fuse (2) is respectively connected with one end of the voltage sensor (3), the positive electrode monitoring interface of the insulation detection module (4) and one end of the current sensor (5); the other end of the current sensor (5) is respectively connected with one end of the positive electrode contactor (6) and one end of the pre-charging contactor (15); the other end of the pre-charging contactor (15) is connected with one end of a pre-charging resistor (16); the other end of the positive contactor (6) is connected with the other end of the pre-charging resistor (16) and then is respectively connected with the traction power supply output interface (7) and the direct-current side positive electrode of the unidirectional AC/DC converter (8); the alternating current side of the unidirectional AC/DC converter (8) is connected with an AC380V power interface (9);
The negative electrode of the lithium titanate battery pack II (17) is connected with one end of the negative electrode fuse (10); the other end of the negative electrode fuse (10) is respectively connected with one end of the negative electrode contactor (11), the other end of the voltage sensor (3) and a negative electrode monitoring interface of the insulation detection module (4); the other end of the negative electrode contactor (11) is respectively connected with the traction power supply output interface (7) and the direct-current side negative electrode of the unidirectional AC/DC converter (8); the negative electrode of the first lithium titanate battery pack (1) is connected with the positive electrode of the second lithium titanate battery pack (17) through a manual maintenance switch (12); the BMS battery management system (13) is connected with the communication and control interface (14), and the BMS battery management system (13) is also connected with the voltage sensor (3), the insulation detection module (4), the current sensor (5), the positive electrode contactor (6), the negative electrode contactor (11), the pre-charging contactor (15) and the lithium titanate battery pack II (17) respectively;
The first lithium titanate battery pack (1) and the second lithium titanate battery pack (17) are used for storing electric energy and supplying the electric energy to a traction system of the rail transit vehicle through a traction power supply output interface (7);
the positive electrode fuse (2) is used for overload and short-circuit protection of a loop of the non-network self-walking energy storage and unidirectional AC/DC converter system;
The voltage sensor (3) is used for sampling and processing the positive voltage of the first lithium titanate battery pack (1) and the negative voltage of the second lithium titanate battery pack (17), then transmitting voltage signals to the BMS battery management system (13), and the BMS battery management system (13) is used for analyzing and monitoring the received voltage signals and then carrying out fault judgment and early warning;
The insulation detection module (4) is used for monitoring the insulation state between the anode of the first lithium titanate battery pack (1) and the ground of the cathode of the second lithium titanate battery pack (17), and if the insulation monitoring value does not meet the power-on requirement, the BMS battery management system (13) disconnects the anode contactor (6) and the cathode contactor (11);
The current sensor (5) is used for sampling and processing charge and discharge currents of the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17), then transmitting current signals to the BMS battery management system (13), and the BMS battery management system (13) is used for monitoring and recording the received current signals and then performing fault judgment and early warning;
The positive electrode contactor (6) and the negative electrode contactor (11) are used for controlling the power-on and power-off of the non-network self-walking energy storage and unidirectional AC/DC converter system, and the BMS battery management system (13) is used for controlling the closing and opening of the positive electrode contactor (6) and the negative electrode contactor (11), so that the power-on and power-off control of the non-network self-walking energy storage and unidirectional AC/DC converter system is realized;
the traction power supply output interface (7) is used for being connected with a traction system of the rail transit vehicle, so that electric energy stored by the non-network self-walking energy storage and unidirectional AC/DC conversion system is supplied to the traction system of the rail transit vehicle through the traction power supply output interface (7);
The unidirectional AC/DC converter (8) is used for requesting to charge through the communication and control interface (14) when the network voltage of the rail transit vehicle is normal, and the BMS battery management system (13) takes an AC380V power supply as input and outputs a direct current power supply to charge the lithium titanate battery group I (1) and the lithium titanate battery group II (17) when the lithium titanate battery group I (1) and the lithium titanate battery group II (17) are fed or need to be charged;
The AC380V power interface (9) is used as an interface between the non-network self-walking energy storage and unidirectional AC/DC converter system and an AC380V alternating current bus of the rail transit vehicle, and when the rail transit vehicle needs to charge the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17), the rail transit vehicle charges the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17) through the AC380V power interface (9);
The negative electrode fuse (10) is used for overload and short-circuit protection of a loop of the non-network self-walking energy storage and unidirectional AC/DC converter system;
The manual maintenance switch (12) is used for effectively disconnecting a circuit between the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17) when the non-network self-walking energy storage and unidirectional AC/DC converter system is overhauled, so that the safety of overhaulers is ensured;
The BMS battery management system (13) is used for monitoring states of the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17), ensuring that the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17) are in a healthy working state, controlling closing and opening of the pre-charging contactor (15), the positive electrode contactor (6) and the negative electrode contactor (11) according to the states of the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17), and monitoring the states of the pre-charging contactor (15), the positive electrode contactor (6) and the negative electrode contactor (11); the system is used for communicating with a TCMS of a rail transit vehicle through a communication and control interface (14), reporting the states of a self-propelled energy storage and unidirectional AC/DC conversion system without a network in real time, and charging a first lithium titanate battery pack (1) and a second lithium titanate battery pack (17) according to a charging strategy; the system is used for monitoring and diagnosing the networking self-walking energy storage and unidirectional AC/DC converter system through a communication and control interface (14); the battery management system is used for receiving a current signal sent by the current sensor (5) and a voltage signal sent by the voltage sensor (3), analyzing and processing the current and voltage signals, judging whether to charge and discharge according to the current and voltage requested by the BMS battery management system (13), and if the current and voltage signals exceed the protection limit value requested by the BMS battery management system (13), the BMS battery management system (13) can protect, and is required to reduce current or voltage, and even the positive electrode contactor (6) and the negative electrode contactor (11) are cut off;
the communication and control interface (14) is used for being connected with a communication interface of the TCMS of the rail transit vehicle to carry out data transmission and control; the communication and control interface (14) is also used for providing DC110V working power supply for the BMS battery management system (13);
the pre-charging contactor (15) and the pre-charging resistor (16) are used for pre-charging a filter capacitor on the direct current side of the unidirectional AC/DC converter (8).
2. The non-net self-propelled energy storage and unidirectional AC/DC conversion system for rail transit of claim 1, wherein said first (1) and second (17) lithium titanate battery packs have both power and energy characteristics.
3. The grid-less self-propelled energy storage and unidirectional AC/DC converter system for rail transit of claim 1, wherein the unidirectional AC/DC converter (8) charges the lithium titanate battery pack one (1) and the lithium titanate battery pack two (17) in a constant-current step-down charging manner, the BMS battery management system (13) sends a charging mode and charging current and voltage values, and the unidirectional AC/DC converter (8) charges according to a request instruction of the BMS battery management system (13).
4. The non-net self-propelled energy storage and unidirectional AC/DC conversion system for rail transit as claimed in claim 1, wherein the pre-charge contactor (15) and the pre-charge resistor (16) can pre-charge the unidirectional AC/DC converter (8) to avoid the impact current caused by the power-up of the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17).
5. The grid-less self-propelled energy storage and unidirectional AC/DC conversion system for rail transit of claim 1, wherein said manual maintenance switch (12) acts as an isolated power source and divides the voltage.
6. The non-network self-propelled energy storage and unidirectional AC/DC converter system for rail transit of claim 1, wherein the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17) directly supply power to a traction system of the rail transit vehicle without DC/DC boost conversion, thereby saving hardware cost.
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