CN212400923U - Netless self-walking energy storage and bidirectional AC/DC converter system for rail transit - Google Patents
Netless self-walking energy storage and bidirectional AC/DC converter system for rail transit Download PDFInfo
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- CN212400923U CN212400923U CN202020635139.4U CN202020635139U CN212400923U CN 212400923 U CN212400923 U CN 212400923U CN 202020635139 U CN202020635139 U CN 202020635139U CN 212400923 U CN212400923 U CN 212400923U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The utility model relates to a self-propelled energy storage and two-way AC DC conversion system of walking of no net for track traffic, including lithium titanate group battery one, positive pole fuse, voltage sensor, insulating detection module, current sensor, anodal contactor, traction power supply output interface, two-way AC DC converter, AC380V power source, negative pole fuse, negative pole contactor, manual maintenance switch, BMS battery management system, communication and control interface, pre-charge contactor, pre-charge resistance and lithium titanate group battery two. The principle is that electric energy is stored in a lithium titanate battery pack, when a vehicle needs to be put into an energy storage system, the vehicle sends an input signal, after the BMS receives a starting signal, the BMS controls a positive contactor, a negative contactor and a bidirectional AC/DC converter in the energy storage system to control and convert the electric energy, and finally, the electric energy is supplied to a vehicle traction system and an AC380V auxiliary load through a traction power supply output interface and an AC380V power supply interface.
Description
Technical Field
The utility model relates to a track traffic power supply technique, the alternately field of converter technique and energy storage technique, especially a track traffic is with having no net from walking energy storage and two-way AC/DC converter system.
Background
The rail transit is with having no net from walking system combines rail transit power supply and current conversion technique and lithium titanate battery energy storage technique, forms independent system and installs in city rail and the vehicle bottom of motor car, and when the normal power receiving of vehicle fails, vehicle control puts into having no net from walking energy storage and two-way AC/DC current conversion system and realizes having no net from walking of vehicle.
The rail transit such as subway, motor train and so on is regarded as the most green traffic mode with the characteristics such as the freight volume is big, fast, safety, environmental protection, energy saving. Because of the large traffic volume and the low driving interval, the power supply system of the vehicle is particularly important. At present, most subway vehicles mainly depend on a contact net or a third rail for external power supply in operation, and when an external power supply fails, the vehicles can only wait for rescue. However, there are cases of operation interruption of subway lines due to external power supply failure every year, and many passengers waiting for trains are collected at subway stations with large passenger flow at ordinary times, which causes adverse effects on normal operation of public transportation. Therefore, the demand that the vehicles can automatically run without a network under the emergency condition that the operation trains of all cities are powered off externally based on the vehicle-mounted energy storage devices is more and more urgent. However, the vehicle-mounted energy storage battery for the rail transit vehicle is generally a lead-acid battery and a cadmium-nickel battery, and the batteries have the characteristics of short service life, environmental pollution, memory effect, difficult maintenance and the like. Therefore, the invention is necessary to provide a safe, reliable and environment-friendly netless self-walking energy storage and bidirectional AC/DC converter system.
The utility model discloses through various experimental verifications, explosion and conflagration can not take place under the various condition of experimental verification, absolute safe and reliable.
The utility model discloses can realize the netless of vehicle and walk by oneself to cycle life is more than 10000 times.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the prior art, the utility model aims to provide a rail transit is with having no net from walking energy storage and two-way AC/DC conversion system. The netless self-walking energy storage and bidirectional AC/DC converter system is arranged at the bottom of a rail transit vehicle, electric energy is processed and converted and then stored in a battery pack made of lithium titanate material, and the system comprises a butt joint interface with the rail transit vehicle and can provide the electric energy according to needs. The utility model discloses a aim at providing the netless self-walking power supply for rail transit vehicle.
In order to achieve the above purpose, the utility model adopts the technical proposal that:
a netless self-walking energy storage and bidirectional AC/DC converter system for rail transit comprises: the system comprises a lithium titanate battery pack I1, an anode fuse 2, a voltage sensor 3, an insulation detection module 4, a current sensor 5, an anode contactor 6, a traction power supply output interface 7, a bidirectional AC/DC converter 8, an AC380V power interface 9, a cathode fuse 10, a cathode contactor 11, a manual maintenance switch 12, a BMS battery management system 13, a communication and 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 lithium titanate battery pack I1 is connected with one end of a positive electrode fuse 2; the other end of the positive fuse 2 is respectively connected with one end of the voltage sensor 3, a positive 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 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 positive pole of the main flow side of the bidirectional AC/DC converter 8; the AC side of the bidirectional AC/DC converter 8 is connected with an AC380V power interface 9; the negative electrode of the lithium titanate battery pack I1 is connected with the positive electrode of the lithium titanate battery pack II 17 through a manual maintenance switch 12;
the negative electrode of the lithium titanate battery pack II 17 is connected with one end of a negative electrode fuse 10; the other end of the negative fuse 10 is respectively connected with one end of a negative contactor 11, the other end of the voltage sensor 3 and a negative monitoring interface of the insulation detection module 4; the other end of the negative contactor 11 is respectively connected with the traction power supply output interface 7 and the direct-current side negative electrode of the bidirectional AC/DC converter 8; the BMS battery management system 13 is connected with a communication and control interface 14; the BMS battery management system 13 is also respectively connected with the voltage sensor 3, the insulation detection module 4, the current sensor 5, the anode contactor 6, the cathode contactor 11, the pre-charging contactor 15 and the lithium titanate battery pack II 17;
the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 are used for storing electric energy, supplying the electric energy to an AC380V auxiliary load of a rail transit vehicle through a bidirectional AC/DC converter 8 and an AC380V power interface 9, and supplying power to a traction converter through a traction power supply output interface 7;
the positive fuse 2 is used for carrying out overload and short-circuit protection on a loop of the netless self-walking energy storage and bidirectional AC/DC converter system;
the voltage sensor 3 is used for sampling and processing the positive voltage of the lithium titanate battery pack I1 and the negative voltage of the lithium titanate battery pack II 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 performing fault judgment and early warning;
the insulation monitoring module 4 is used for monitoring the insulation state between the positive electrode of the lithium titanate battery pack I1 and the negative electrode of the lithium titanate battery pack II 17 to the ground, 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 the charging and discharging currents of the lithium titanate battery pack I1 and the lithium titanate battery pack II 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 contactor 6 and the negative contactor 11 are used for electrically controlling the power-on and power-off of the netless self-walking energy storage and bidirectional AC/DC converter system, and the BMS battery management system 13 is used for controlling the on and off of the positive contactor 6 and the negative contactor 11, so that the power-on and power-off control of the netless self-walking energy storage and bidirectional 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 netless self-walking energy storage and bidirectional AC/DC converter system is supplied to the traction system of the rail transit vehicle through the traction power supply output interface 7;
the bidirectional AC/DC converter 8 is used for inverting the electric energy stored in the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 into AC380V when no high-voltage power supply is input to the rail transit vehicle, and supplying power to an AC380V auxiliary load of the rail transit vehicle through an AC380V power interface 9; on the other hand, when the grid voltage of the rail transit vehicle is normal, and the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 feed or need to be charged, the BMS battery management system 13 requests to be charged through the communication and control interface 14, the bidirectional AC/DC converter 8 takes the AC380V power supply as input, and outputs a direct current power supply to charge the lithium titanate battery pack I1 and the lithium titanate battery pack II 17;
the AC380V power interface 9 is used as an interface between a netless self-propelled energy storage and bidirectional AC/DC converter system and an AC380V alternating current bus of a rail transit vehicle, when the rail transit vehicle needs a lithium titanate battery pack I1 and a lithium titanate battery pack II 17 to supply power for an auxiliary load of the rail transit vehicle AC380V, the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 discharge through the AC380V power interface 9, and when the rail transit vehicle needs to charge the lithium titanate battery pack I1 and the lithium titanate battery pack II 17, the rail transit vehicle charges the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 through the AC380V power interface 9;
the negative fuse 10 is used for overload and short-circuit protection of a loop of a netless self-walking energy storage and bidirectional AC/DC converter system;
the manual maintenance switch 12 is used for effectively disconnecting a circuit between the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 when the netless self-walking energy storage and bidirectional AC/DC converter system is maintained, so that the safety of maintenance personnel is ensured;
the BMS battery management system 13 is used for monitoring the states of the lithium titanate battery pack I1 and the lithium titanate battery pack II 17, ensuring that the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 are in a healthy working state, controlling the on and off of the pre-charging contactor 15, the anode contactor 6 and the cathode contactor 11 according to the states of the lithium titanate battery pack I1 and the lithium titanate battery pack II 17, and monitoring the states of the pre-charging contactor 15, the anode contactor 6 and the cathode contactor 11; the system is used for communicating with a track traffic vehicle TCMS through a communication and control interface 14, reporting the states of the net-free self-walking energy storage and bidirectional AC/DC converter system in real time, and charging a lithium titanate battery pack I1 and a lithium titanate battery pack II 17 according to a charging strategy; the system is used for monitoring and diagnosing the netless self-walking energy storage and bidirectional AC/DC converter system through the communication and control interface 14; the 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, if the current and voltage signals exceed the protection limit value requested by the BMS battery management system 13, protecting the BMS battery management system 13, and requiring current reduction or voltage reduction, even cutting off the positive contactor 6 and the negative contactor 11;
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 to provide DC110V operating power to the BMS battery management system 13;
the pre-charging contactor 15 and the pre-charging resistor 16 are both used for pre-charging the filter capacitor on the direct current side of the bidirectional AC/DC converter 8.
On the basis of the scheme, the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 both have power characteristics and energy characteristics, and are more suitable for occasions with limited vehicle installation space and the requirement for increasing the netless self-walking function.
On the basis of the scheme, the bidirectional AC/DC converter 8 charges the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 in a constant-current step-down charging mode, the BMS battery management system 13 sends a charging mode, a charging current and a charging voltage value, and the bidirectional AC/DC converter 8 charges according to a request instruction of the BMS battery management system 13.
On the basis of the above scheme, the pre-charging contactor 15 and the pre-charging resistor 16 can pre-charge the bidirectional AC/DC converter 8, so as to avoid an impact current caused when the lithium titanate battery pack 1 and the lithium titanate battery pack 17 are powered on.
On the basis of the above scheme, the manual maintenance switch 12 plays a role in isolating the power supply and dividing the voltage.
On the basis of the scheme, the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 directly supply power to a traction system of the rail transit vehicle without DC/DC boost conversion, and hardware cost is saved.
Technical scheme can realize rail transit vehicle's no net from walking, the battery adopts lithium titanate battery to disposed Battery Management System (BMS), BMS can real time monitoring battery energy storage system state. Not only the reliability of power supply is increased, but also the safety of the vehicle is enhanced. The system also integrates a bidirectional AC/DC converter to realize bidirectional transmission of electric energy. The utility model is suitable for a multiple track transportation vehicles, safe reliable again.
Drawings
The utility model discloses there is following figure:
fig. 1 is a diagram of the structure 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 utility model provides a pair of energy storage and two-way AC/DC converter system are walked from walking to no net for track traffic, include: the system comprises a lithium titanate battery pack I1, an anode fuse 2, a voltage sensor 3, an insulation detection module 4, a current sensor 5, an anode contactor 6, a traction power supply output interface 7, a bidirectional AC/DC converter 8, an AC380V power interface 9, a cathode fuse 10, a cathode contactor 11, a manual maintenance switch 12, a BMS battery management system 13, a communication and 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 lithium titanate battery pack I1 is connected with one end of a positive electrode fuse 2; the other end of the positive fuse 2 is respectively connected with one end of the voltage sensor 3, a positive 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 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 bidirectional AC/DC converter 8; the AC side of the bidirectional AC/DC converter 8 is connected with an AC380V power interface 9; the negative electrode of the lithium titanate battery pack I1 is connected with the positive electrode of the lithium titanate battery pack II 17 through a manual maintenance switch 12;
the negative electrode of the lithium titanate battery pack II 17 is connected with one end of a negative electrode fuse 10; the other end of the negative fuse 10 is respectively connected with one end of a negative contactor 11, the other end of the voltage sensor 3 and a negative monitoring interface of the insulation detection module 4; the other end of the negative contactor 11 is respectively connected with the traction power supply output interface 7 and the direct-current side negative electrode of the bidirectional AC/DC converter 8; the BMS battery management system 13 is connected with a communication and control interface 14; the BMS battery management system 13 is also respectively connected with the voltage sensor 3, the insulation detection module 4, the current sensor 5, the anode contactor 6, the cathode contactor 11, the pre-charging contactor 15 and the lithium titanate battery pack II 17;
the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 are used for storing electric energy, supplying the electric energy to an AC380V auxiliary load of the rail transit vehicle through a bidirectional AC/DC converter 8 and an AC380V power interface 9, and supplying power to a traction system of the rail transit vehicle through a traction power supply output interface 7;
the positive fuse 2 is used for carrying out overload and short-circuit protection on a loop of the netless self-walking energy storage and bidirectional AC/DC converter system;
the voltage sensor 3 is used for sampling and processing the positive voltage of the lithium titanate battery pack I1 and the negative voltage of the lithium titanate battery pack II 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 performing fault judgment and early warning;
the insulation monitoring module 4 is used for monitoring the insulation state between the positive electrode of the lithium titanate battery pack I1 and the negative electrode of the lithium titanate battery pack II 17 to the ground, 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 the charging and discharging currents of the lithium titanate battery pack I1 and the lithium titanate battery pack II 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 contactor 6 and the negative contactor 11 are used for electrically controlling the power-on and power-off of the netless self-walking energy storage and bidirectional AC/DC converter system, and the BMS battery management system 13 is used for controlling the on and off of the positive contactor 6 and the negative contactor 11, so that the power-on and power-off control of the netless self-walking energy storage and bidirectional 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 netless self-walking energy storage and bidirectional AC/DC converter system is supplied to the traction system of the rail transit vehicle through the traction power supply output interface 7;
the bidirectional AC/DC converter 8 is used for inverting the electric energy stored in the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 into AC380V when no high-voltage power supply is input to the rail transit vehicle, and supplying power to an AC380V auxiliary load of the rail transit vehicle through an AC380V power interface 9; on the other hand, when the grid voltage of the rail transit vehicle is normal, and the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 feed or need to be charged, the BMS battery management system 13 requests to be charged through the communication and control interface 14, the bidirectional AC/DC converter 8 takes the AC380V power supply as input, and outputs a direct current power supply to charge the lithium titanate battery pack I1 and the lithium titanate battery pack II 17;
the AC380V power interface 9 is used as an interface between a netless self-propelled energy storage and bidirectional AC/DC converter system and an AC380V alternating current bus of a rail transit vehicle, when the rail transit vehicle needs a lithium titanate battery pack I1 and a lithium titanate battery pack II 17 to supply power for an auxiliary load of the rail transit vehicle AC380V, the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 discharge through the AC380V power interface 9, and when the rail transit vehicle needs to charge the lithium titanate battery pack I1 and the lithium titanate battery pack II 17, the rail transit vehicle charges the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 through the AC380V power interface 9;
the negative fuse 10 is used for overload and short-circuit protection of a loop of a netless self-walking energy storage and bidirectional AC/DC converter system;
the manual maintenance switch 12 is used for effectively disconnecting a circuit between the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 when the netless self-walking energy storage and bidirectional AC/DC converter system is maintained, so that the safety of maintenance personnel is ensured;
the BMS battery management system 13 is used for monitoring the states of the lithium titanate battery pack I1 and the lithium titanate battery pack II 17, ensuring that the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 are in a healthy working state, controlling the on and off of the pre-charging contactor 15, the anode contactor 6 and the cathode contactor 11 according to the states of the lithium titanate battery pack I1 and the lithium titanate battery pack II 17, and monitoring the states of the pre-charging contactor 15, the anode contactor 6 and the cathode contactor 11; the system is used for communicating with a track traffic vehicle TCMS through a communication and control interface 14, reporting the states of the net-free self-walking energy storage and bidirectional AC/DC converter system in real time, and charging a lithium titanate battery pack I1 and a lithium titanate battery pack II 17 according to a charging strategy; the system is used for monitoring and diagnosing the netless self-walking energy storage and bidirectional AC/DC converter system through the communication and control interface 14; the 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, if the current and voltage signals exceed the protection limit value requested by the BMS battery management system 13, protecting the BMS battery management system 13, and requiring current reduction or voltage reduction, even cutting off the positive contactor 6 and the negative contactor 11;
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 to provide DC110V operating power to the BMS battery management system 13;
the pre-charging contactor 15 and the pre-charging resistor 16 are both used for pre-charging the filter capacitor on the direct current side of the bidirectional AC/DC converter 8.
On the basis of the scheme, the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 both have power characteristics and energy characteristics, and are more suitable for occasions with limited vehicle installation space and the requirement for increasing the netless self-walking function.
On the basis of the scheme, the bidirectional AC/DC converter 8 charges the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 in a constant-current step-down charging mode, the BMS battery management system 13 sends a charging mode, a charging current and a charging voltage value, and the bidirectional AC/DC converter 8 charges according to a request instruction of the BMS battery management system 13.
On the basis of the above scheme, the pre-charging contactor 15 and the pre-charging resistor 16 can pre-charge the bidirectional AC/DC converter 8, so as to avoid an impact current caused when the lithium titanate battery pack 1 and the lithium titanate battery pack 17 are powered on.
On the basis of the above scheme, the manual maintenance switch 12 plays a role in isolating the power supply and dividing the voltage.
On the basis of the scheme, the lithium titanate battery pack I1 and the lithium titanate battery pack II 17 directly supply power to a traction system of the rail transit vehicle without DC/DC boost conversion, and hardware cost is saved.
Technical scheme can realize rail transit vehicle's no net from walking, the battery adopts lithium titanate battery to disposed Battery Management System (BMS), BMS can real time monitoring battery energy storage system state. Not only the reliability of power supply is increased, but also the safety of the vehicle is enhanced. The system also integrates a bidirectional AC/DC converter to realize bidirectional transmission of electric energy. The utility model is suitable for a multiple track transportation vehicles, safe reliable again.
Those not described in detail in this specification are within the skill of the art.
Claims (6)
1. The utility model provides a rail transit is with having no net from walking energy storage and two-way AC/DC conversion system, its characterized in that includes: the device comprises a lithium titanate battery pack I (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 bidirectional 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 and 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 lithium titanate battery pack I (1) is connected with one end of a positive electrode fuse (2); the other end of the positive fuse (2) is respectively connected with one end of the voltage sensor (3), a positive 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 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 bidirectional AC/DC converter (8); the alternating current side of the bidirectional AC/DC converter (8) is connected with an AC380V power interface (9); the negative electrode of the lithium titanate battery pack I (1) is connected with the positive electrode of the lithium titanate battery pack II (17) through a manual maintenance switch (12);
the negative electrode of the lithium titanate battery pack II (17) is connected with one end of a negative electrode fuse (10); the other end of the negative fuse (10) is respectively connected with one end of a negative contactor (11), the other end of the voltage sensor (3) and a negative monitoring interface of the insulation detection module (4); the other end of the negative contactor (11) is respectively connected with the traction power supply output interface (7) and the direct current side negative electrode of the bidirectional AC/DC converter (8); the BMS battery management system (13) is connected with the communication and control interface (14); the BMS battery management system (13) is also respectively connected with a voltage sensor (3), an insulation detection module (4), a current sensor (5), a positive contactor (6), a negative contactor (11), a pre-charging contactor (15) and a lithium titanate battery pack II (17);
the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17) are used for storing electric energy, supplying the electric energy to an AC380V auxiliary load of a rail transit vehicle through a bidirectional AC/DC converter (8) and an AC380V power interface (9), and supplying power to a traction system of the rail transit vehicle through a traction power supply output interface (7);
the positive fuse (2) is used for carrying out overload and short-circuit protection on a loop of a netless self-walking energy storage and bidirectional AC/DC converter system;
the voltage sensor (3) is used for sampling and processing the positive voltage of the lithium titanate battery pack I (1) and the negative voltage of the lithium titanate battery pack II (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 performing fault judgment and early warning;
the insulation detection module (4) is used for monitoring the insulation state between the anode of the lithium titanate battery pack I (1) and the cathode of the lithium titanate battery pack II (17) to the ground, 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 the charging and discharging currents of the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17), then current signals are transmitted 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 carrying out fault judgment and early warning;
the positive contactor (6) and the negative contactor (11) are used for electrically controlling the power-on and power-off of the netless self-walking energy storage and bidirectional AC/DC converter system, and the BMS battery management system (13) is used for controlling the on and off of the positive contactor (6) and the negative contactor (11), so that the power-on and power-off control of the netless self-walking energy storage and bidirectional 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 netless self-walking energy storage and bidirectional AC/DC converter system is supplied to the traction system of the rail transit vehicle through the traction power supply output interface (7);
the bidirectional AC/DC converter (8) is used for inverting the electric energy stored in the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17) into AC380V when no high-voltage power supply is input into the rail transit vehicle, and supplying power to an AC380V auxiliary load of the rail transit vehicle through an AC380V power interface (9); on the other hand, when the grid voltage of the rail transit vehicle is normal, the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17) feed or need to be charged, the BMS battery management system (13) requests to be charged through the communication and control interface (14), the bidirectional AC/DC converter (8) takes the AC380V power supply as input, and outputs a direct current power supply to charge the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17);
the AC380V power interface (9) is used as an interface between a netless self-propelled energy storage and bidirectional AC/DC converter system and an AC380V alternating current bus of a rail transit vehicle, when the rail transit vehicle needs a first lithium titanate battery pack (1) and a second lithium titanate battery pack (17) to supply power for an AC380V auxiliary load of the rail transit vehicle, the first lithium titanate battery pack (1) and the second lithium titanate battery pack (17) discharge through the AC380V power interface (9), 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 fuse (10) is used for carrying out overload and short-circuit protection on a loop of the netless self-walking energy storage and bidirectional AC/DC converter system;
the manual maintenance switch (12) is used for effectively disconnecting a circuit between the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17) when the netless self-walking energy storage and bidirectional AC/DC converter system is maintained, so that the safety of maintenance personnel is ensured;
the BMS battery management system (13) is used for monitoring the states of the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17), ensuring that the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17) are in a healthy working state, controlling the on and off of the pre-charging contactor (15), the anode contactor (6) and the cathode contactor (11) according to the states of the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17), and monitoring the states of the pre-charging contactor (15), the anode contactor (6) and the cathode contactor (11); the system is used for communicating with a track traffic vehicle TCMS through a communication and control interface (14), reporting the states of the netless self-walking energy storage and bidirectional AC/DC converter system in real time, and charging a lithium titanate battery pack I (1) and a lithium titanate battery pack II (17) according to a charging strategy; the system is used for monitoring and diagnosing the netless self-walking energy storage and bidirectional AC/DC converter system through a communication and control interface (14); the system is used for receiving a current signal sent by a current sensor (5) and a voltage signal sent by a 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 a BMS battery management system (13), if the current and voltage signals exceed the protection limit value requested by the BMS battery management system (13), protecting the BMS battery management system (13), requiring to reduce the current or voltage, and even cutting off a positive contactor (6) and a negative contactor (11);
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 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 bidirectional AC/DC converter (8).
2. The netless self-propelled energy storage and bidirectional AC/DC converter system for rail transit as claimed in claim 1, wherein the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17) both have power characteristics and energy characteristics.
3. The net-free self-propelled energy storage and bidirectional AC/DC converter system for rail transit as claimed in claim 1, wherein the bidirectional AC/DC converter (8) is a constant current step-down charging mode by charging the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17), the BMS battery management system (13) sends charging mode and charging current and voltage values, and the bidirectional AC/DC converter (8) performs charging according to the request command of the BMS battery management system (13).
4. The netless self-propelled energy storage and bidirectional AC/DC converter system for rail transit as claimed in claim 1, wherein the pre-charging contactor (15) and the pre-charging resistor (16) can pre-charge the bidirectional AC/DC converter (8) to avoid surge current caused by power-up of the lithium titanate battery pack one (1) and the lithium titanate battery pack two (17).
5. The netless self-propelled energy storage and bidirectional AC/DC converter system for rail transit as claimed in claim 1, characterized in that said manual service switch (12) functions to isolate the power supply and to divide the voltage.
6. The netless self-propelled energy storage and bidirectional AC/DC converter system for rail transit as defined in claim 1, wherein the lithium titanate battery pack I (1) and the lithium titanate battery pack II (17) directly supply power to a traction system of a rail transit vehicle without DC/DC boost conversion, thereby saving hardware cost.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020635139.4U CN212400923U (en) | 2020-04-24 | 2020-04-24 | Netless self-walking energy storage and bidirectional AC/DC converter system for rail transit |
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| CN202020635139.4U CN212400923U (en) | 2020-04-24 | 2020-04-24 | Netless self-walking energy storage and bidirectional AC/DC converter system for rail transit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111591148A (en) * | 2020-04-24 | 2020-08-28 | 北京北交新能科技有限公司 | Netless self-walking energy storage and bidirectional AC/DC converter system for rail transit |
| CN114228752A (en) * | 2021-12-23 | 2022-03-25 | 中车长春轨道客车股份有限公司 | Novel energy storage system suitable for virtual track direction train |
| CN116788072A (en) * | 2023-05-22 | 2023-09-22 | 北京北九方轨道交通科技有限公司 | Power supply system of electric locomotive |
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2020
- 2020-04-24 CN CN202020635139.4U patent/CN212400923U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111591148A (en) * | 2020-04-24 | 2020-08-28 | 北京北交新能科技有限公司 | Netless self-walking energy storage and bidirectional AC/DC converter system for rail transit |
| CN114228752A (en) * | 2021-12-23 | 2022-03-25 | 中车长春轨道客车股份有限公司 | Novel energy storage system suitable for virtual track direction train |
| CN114228752B (en) * | 2021-12-23 | 2024-04-23 | 中车长春轨道客车股份有限公司 | Energy storage system suitable for virtual track guide train |
| CN116788072A (en) * | 2023-05-22 | 2023-09-22 | 北京北九方轨道交通科技有限公司 | Power supply system of electric locomotive |
| CN116788072B (en) * | 2023-05-22 | 2024-03-29 | 北京北九方轨道交通科技有限公司 | Power supply system of electric locomotive |
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