CN110228372B - Third rail and lithium battery hybrid power supply circuit - Google Patents
Third rail and lithium battery hybrid power supply circuit Download PDFInfo
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- CN110228372B CN110228372B CN201910524925.9A CN201910524925A CN110228372B CN 110228372 B CN110228372 B CN 110228372B CN 201910524925 A CN201910524925 A CN 201910524925A CN 110228372 B CN110228372 B CN 110228372B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 101
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000012546 transfer Methods 0.000 claims description 13
- 238000002955 isolation Methods 0.000 claims 2
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 6
- 238000004146 energy storage Methods 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
- B60L5/38—Current collectors for power supply lines of electrically-propelled vehicles for collecting current from conductor rails
- B60L5/39—Current collectors for power supply lines of electrically-propelled vehicles for collecting current from conductor rails from third rail
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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
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A third rail and lithium battery hybrid power supply circuit is characterized in that under the emergency condition that the third rail has no network voltage, electric energy required by vehicle emergency traction is supplied by an emergency traction lithium battery; and the power supply conversion between the third rail and the lithium battery is controlled by the change-over switch box. The technical scheme of the invention realizes emergency traction power supply of the lithium battery of the urban rail vehicle, can meet the requirement of emergency traction energy consumption of long-time heavy current discharge based on the advantages of the lithium battery, and solves the traction problems of traction in special non-electricity areas (such as sections, knife and fork intersections, and the like), emergency working condition traction and complex ramp working conditions. The hybrid power supply circuit is higher in safety, when a power supply network fails, the vehicle can be automatically pulled to a nearby station to unload passengers and return to a garage, the vehicle does not need to be pulled for rescue, and the vehicle self-rescue function can be realized.
Description
Technical Field
The invention relates to the technical field of power supply of urban rail vehicles, in particular to a third rail and lithium battery hybrid power supply circuit.
Background
At present, urban rail vehicles are mainly powered through a single mode of a contact network or a third rail, the power supply mode has the characteristics of maturity, reliability, convenience in installation and layout and the like, but the problems of grid faults and vehicle traction in special non-electricity areas (section internal moving warehouse, intersection and the like) in the current vehicle operation cannot be solved. The current emergency traction scheme is only suitable for short-distance straight lines, cannot meet emergency traction requirements of ramps and complex working conditions, and has a plurality of limiting requirements on vehicles.
In an emergency traction scheme in the prior art, a scheme of hybrid power supply of a third rail and an alkaline storage battery is adopted, the scheme is to assist a vehicle to pass through a dead zone by increasing the capacity of a vehicle storage battery, and the scheme is generally applicable to a straight line with short dead zone distance. The scheme selects the alkaline storage battery as a power source, and the alkaline storage battery has the defects of low energy density, low power density, short cycle life, large weight and large volume, so that the alkaline storage battery cannot meet the requirements of long-distance operation and frequent use of emergency traction of the subway vehicle.
In another emergency traction scheme in the prior art, a scheme of ground power supply and super capacitor hybrid power supply is adopted, and the scheme has three charging modes: (1) the method comprises the following steps that (1) a vehicle is parked and charged to store energy by using a terminal station and an intermediate station, (2) the terminal station is charged, and (3) the whole line adopts ground power supply and charges a super capacitor; the power supply mode is that the power supply is only carried out by adopting a super capacitor (off-line operation) when the vehicle passes through the intersection, and the power supply is carried out by adopting a ground power supply mode under other working conditions. By adopting the emergency traction scheme, more charging stations are required, and the capital construction cost is high; frequent charging is needed, the service life of the super capacitor is short, frequent replacement is realized, and the cost is high; in addition, the volume and the weight are large due to the need of configuring large capacity; due to the technical limitation of the super capacitor, the conventional super capacitor is not suitable for large-current discharge of a subway vehicle for a long time, cannot be drawn for a long distance, and is only mounted on a tramcar at present.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
In order to solve the above technical problems, an embodiment of the present invention provides a third rail and lithium battery hybrid power supply circuit, which can supply power to a vehicle in normal operation by using a third rail power supply mode, and can drive the vehicle to move at a low speed by using energy stored in a lithium battery when the third rail power supply is interrupted, so that the vehicle is automatically towed to a desired station or is moved to a garage.
The embodiment of the invention discloses a third rail and lithium battery hybrid power supply circuit, which comprises:
under the emergency condition that the third rail has no network voltage, the electric energy required by the emergency traction of the vehicle is supplied by an emergency traction lithium battery; and the number of the first and second electrodes,
the power supply conversion of the third rail and the lithium battery is controlled by the change-over switch box.
Further, in an emergency situation where the third rail has no mains voltage, the vehicle auxiliary system emergency load is powered by the alkaline storage battery.
Further, in the change-over switch box, K1 in the power supply mode switch is used for connecting three rail positions; k2 in the power supply mode switch is used for connecting a lithium battery potential.
Further, the change-over switch box is arranged on the motor car.
Furthermore, after K2 in the power supply mode switch is connected with a lithium battery position, a lithium battery box is connected to a whole vehicle bus through an auxiliary isolating switch box after being boosted through a converter, and power is supplied to traction equipment.
Further, the lithium cell setting is on the trailer, the converter with supplementary isolator case sets up on the trailer.
Further, powering the traction device includes: the current flows into the high-voltage electrical box and the filter reactor, then is input into the traction inverter, and is rectified to output the current required by the traction motor so as to provide kinetic energy for the traction motor.
Further, after K2 in the power supply mode switch is connected with the lithium battery position, the brake resistor fan contactor is disconnected, and the brake resistor box quits working.
Further, the lithium battery is charged during the vehicle stop or coasting phase.
Furthermore, the third rail current is connected to the converter through the auxiliary isolating switch box, and is used for charging the lithium battery after rectification and voltage transformation.
By adopting the technical scheme, the invention at least has the following beneficial effects:
the technical scheme of the invention realizes emergency traction power supply of the lithium battery of the urban rail vehicle, can meet the requirement of emergency traction energy consumption of long-time heavy current discharge based on the advantages of the lithium battery, and solves the traction problems of traction in special non-electricity areas (such as sections, knife and fork intersections, and the like), emergency working condition traction and complex ramp working conditions. The hybrid power supply circuit is higher in safety, when a power supply network fails, the vehicle can be automatically pulled to a nearby station to unload passengers and return to a garage, the vehicle does not need to be pulled for rescue, and the vehicle self-rescue function can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a third rail power supply energy flow diagram in a third rail and lithium battery hybrid power supply according to an embodiment of the present invention;
fig. 2 is a power supply energy flow diagram of a lithium battery in a third rail and lithium battery hybrid power supply according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a charging energy flow of a lithium battery in a third rail and lithium battery hybrid power supply according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a hybrid power supply circuit of a third rail and a lithium battery according to an embodiment of the invention;
fig. 5 is a circuit diagram of a hybrid power supply circuit of a third rail and a lithium battery according to an embodiment of the invention;
fig. 6 is a circuit diagram of a hybrid power supply circuit of a third rail and a lithium battery according to an embodiment of the invention;
fig. 7 is a circuit diagram of a hybrid power supply circuit of a third rail and a lithium battery according to an embodiment of the invention.
Wherein:
IVS: auxiliary isolating switch box, IVHB: auxiliary high-speed circuit breaker, SIV: auxiliary inverter, BCG: battery charger box, BATB: battery box, MS: main isolating switch box, CS: transfer switch box, MF: main fuse box, HB: high-speed breaker box, VVVF: traction inverter, BT: traction lithium battery box, DC/DC: DC/DC converter, BHB: bus circuit breaker box, BF: bus fuse box, CCD current collector, ARR: arrester, HV: high-voltage electrical box, FL: filter reactor, IM: traction motor, BR: brake resistor box, BFANC: brake resistance fan contactor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
As shown in fig. 1 to 6, the embodiment of the invention discloses a third rail and lithium battery hybrid power supply circuit, in an emergency situation where the third rail has no grid voltage, electric energy required by vehicle emergency traction is supplied by an emergency traction lithium battery; and the power supply conversion between the third rail and the lithium battery is controlled by the change-over switch box.
According to the technical scheme, a lithium battery (preferably a lithium titanate battery) is used as a power battery, and energy storage and output conversion of the lithium battery are realized through a bidirectional DC/DC converter, so that the emergency traction vehicle runs. The lithium titanate battery has the advantages of high energy density and high power density, is superior in cycle life, low-temperature performance, safety and the like, and can meet the requirement of emergency traction energy consumption for long-time heavy-current discharge.
The emergency traction working process of lithium battery power supply can be as follows: the vehicle is static on a straight track, and a driver activates a power supply mode switch on the control console to convert a traction system from a third rail power supply mode into a lithium battery power supply mode, so that the vehicle is automatically pulled under the condition of no high-voltage input, and the function of transferring the vehicle to a garage is realized. The lithium battery provides voltage required by a traction power supply through a DC/DC converter of the boosting device, the lithium battery only ensures the load work of a basic traction system of a vehicle during emergency traction, and a lithium battery power supply mode is mainly used in a section and a ramp non-electricity area.
The hybrid power supply circuit disclosed by the embodiment of the invention mainly realizes the emergency traction function of the vehicle, completes the safe conversion of two power supply modes and reasonably controls the electric energy transmission. When the power grid has no fault and the vehicle runs on the positive line, a third rail power supply mode is adopted, electric energy is transmitted to the traction inverter through the third rail, the electric energy is rectified by the traction inverter to supply power for the traction motor, the other part of electric energy is transformed by the DC/DC converter and then stored in the lithium battery, and the flow direction of the electric energy is shown in figure 1.
In the hybrid power supply circuit disclosed by the embodiment of the invention, when a vehicle breaks down and has no high voltage or passes through a special area, the lithium battery is changed into a power supply by activating a lithium battery power supply mode, the power is boosted by the DC/DC converter and reversely transmitted to the traction inverter, the traction inverter supplies power to the traction motor after rectification, the vehicle is driven to run at a low speed, and the current flows to the mode shown in figure 2.
In the hybrid power supply circuit disclosed in the embodiment of the invention, after the emergency traction is completed, the state of charge SOC of the lithium battery is low, that is, the remaining power is low, and after the power supply network recovers power supply, energy needs to be supplemented to the battery (for example, at a station stop or an idling stage), and at this time, an energy flow diagram is shown in fig. 3.
As shown in fig. 4-6, when the third rail is started to supply power, the hybrid power supply circuit disclosed in an embodiment of the present invention first needs to rotate the power supply mode switch to the three-rail position, and the current enters the M/M1 car bus breaker box (BHB) through the Current Collector (CCD), and is further connected to the three-rail circuit of the transfer switch box (CS), as shown in fig. 5. At this time, a K1 contact of a transfer switch box (CS) in fig. 4 is closed, current flows into a high-voltage electrical box (HV) and a filter reactor (FL), the current is input into a traction inverter (VVVF), and is rectified to output current required by a traction motor, so that kinetic energy is provided for the traction motor, and the traction motor (IM) is started to drive a vehicle to run. The brake resistor Box (BR) is connected to the traction inverter (VVVF) for feeding back regenerative braking energy.
When the emergency power supply of the lithium battery is started, the power supply mode switch is firstly required to be rotated to a battery position, a lithium battery Box (BT) positioned on a T vehicle is boosted to 750V voltage through a DC/DC converter (DC/DC), and is transmitted to a whole vehicle bus through an auxiliary isolating switch box (IVS) to supply power for the traction equipment. Then, as shown in fig. 4, the lithium battery traction bus is transmitted from the T car to a traction main loop of the M/M1 car, and is connected to a battery circuit of a transfer switch box (CS) of the M/M1 car, a K2 contact is closed, current flows into a high-voltage electrical box (HV) and a filter reactor (FL), is input to a traction inverter (VVVF), and is rectified to output current required by the traction motor, so that kinetic energy is provided for the traction motor, and the traction motor (IM) is started to drive the vehicle to run. Under the emergency power supply working condition of the lithium battery, the brake resistor Box (BR) is withdrawn from working, and the brake resistor fan contactor (BFANC) is disconnected.
When the lithium battery is charged, the third rail current is connected to a DC/DC converter (DC/DC) through an auxiliary isolating switch box (IVS), and the lithium battery is charged after rectification and voltage transformation.
In some embodiments of the invention, the lithium battery pack for emergency traction is arranged under a T-car, and the battery pack is a lithium titanate battery with rated voltage DC 607V. In the emergency situation of the third rail without grid voltage, the emergency load of the vehicle auxiliary system is powered by two groups of alkaline storage battery packs arranged on the Tc vehicle, and the electric energy required by the emergency traction of the vehicle is powered by an emergency traction lithium battery arranged on the T vehicle. The conversion of the two working conditions is controlled by a change-over switch box under each motor car, and the conversion of the voltage is realized by a DC/DC converter of the T car.
The lithium battery power supply circuit is activated through the change-over switch and the emergency traction mode switch CS, a DC/DC converter located in the T car boosts the voltage of the lithium battery into the voltage required by traction of the traction inverters VVVVF, and the voltage is sent to the traction inverters VVVF through the train bus.
In the hybrid power supply circuit disclosed by the embodiment of the invention, besides conventional third rail traction system equipment, the third rail and lithium battery hybrid circuit is also required to be provided with a conversion switch box, an auxiliary isolating switch box, a DC/DC converter, a traction lithium battery box, a high-voltage distribution box (I), a power supply mode switch, a control circuit breaker, a workshop high-voltage connector and a high-voltage distribution box (II).
The functions of the components are as follows:
(1) change-over switch box
The function of the transfer switch box is to switch the main loop bus from the third rail power supply to the lithium battery power supply. When the third rail is powered normally, the switch in the change-over switch box is arranged at the position of the third rail, the 750V bus is connected to the change-over switch box through the bus fuse and the bus breaker, and then is connected with other high-voltage electrical boxes to finally supply power to the traction motor.
When the third rail has no high voltage, the switch in the change-over switch box is switched to a battery position, and the lithium battery supplies power to the traction system through the bus.
(2) Auxiliary isolating switch box
The auxiliary isolating switch box has the function of breaking the line connection between the 750V high-voltage bus and the DC/DC converter box. When the vehicle normally runs, the auxiliary isolating switch box provides a positive line and a negative line of a 750V loop for the DC/DC converter box, and the DC/DC converter reduces the voltage to direct-current voltage for charging the lithium battery.
When the equipment needs to be overhauled, the auxiliary isolating switch is arranged at an isolating position, and the equipment is subjected to maintenance tests such as inspection, voltage resistance and the like. After the maintenance and test work is completed, the switch is restored to the normal 'running' position.
(3) DC/DC converter box
The DC/DC converter box has two working conditions:
under normal working conditions, the DC/DC converter box transforms the voltage obtained from the 750V bus to the voltage for charging the lithium battery, and provides electric energy for charging the lithium battery.
Under the third rail fault working condition or when the third rail passes through the special dead zone, the voltage of the lithium battery is boosted to 750V by the DC/DC converter box and then transmitted to the traction inverter of each motor car, so that the energy required by the emergency traction of the vehicle is provided.
(4) Traction lithium battery box
The traction lithium battery box is used for providing direct-current voltage for the traction lithium battery in a state that the third rail is in a power-free state, the direct-current voltage is transformed into 750V through the DC/DC converter box, and then the electric energy for emergency traction is provided for the motor car traction inverter.
(5) High-voltage branch box 1
The function of the high-voltage distribution box (I) is to provide a distribution point on a 750V bus and provide a wiring point for the input end of the auxiliary isolating switch box.
(6) Workshop high-voltage connector
The workshop high-voltage connector has the function of connecting the high-voltage buses of the two carriages to form a complete auxiliary power supply bus line. The installation mode that both ends are connectors is adopted, and both ends are connected to the socket during normal operation; when the vehicle is unfolded and woven, the connecting plug and the wire are collected, so that the vehicle can be unfolded and woven conveniently and quickly.
(7) High-voltage branch box 2
The high-voltage distribution box (II) has the function of providing a distribution point for a lithium battery power supply bus and connecting the change-over switch box to the auxiliary power supply main loop.
Examples
Now, a scheme is introduced by taking a three-action three-towing urban rail vehicle as an example, wherein the grouping type is-Tc + M + M-T + M + Tc-. When the vehicle is in lithium battery emergency traction, three motor cars provide power required by the traction of the train for the whole train, the change-over switch is arranged on the M \ M1\ M three motor cars, the lithium battery box BT, the DC/DC converter and the auxiliary isolating switch box IVS are arranged on the trailer T and are connected with each other through the high-voltage bus, and the topological structure of the hybrid power supply circuit is shown in fig. 7.
The emergency traction condition of the storage battery for warehousing of the urban rail vehicle is as follows:
the first condition is as follows: (1) 20% o slope 325m (AW3) + straight road 500m (AW 3);
and a second condition: (2)24.2 per thousand grade 200m (AW3) +3.5 per thousand grade 150m (AW3) + flat road 150m
Considering that the condition I is more difficult than the condition II, the whole lithium battery emergency traction scheme is designed according to the condition I, and the condition I can meet the requirement of full-line emergency traction.
Besides conventional third rail traction system equipment, the lithium battery traction circuit needs to be provided with the following equipment, which is detailed in table 1.
TABLE 1 lithium battery supply configuration
The key of the design of the main circuit is the control mode of high-voltage circuit conversion, and the two power supply modes are converted and controlled through the conversion switch box CS.
When the third rail supplies power, a 750V high-voltage bus is output through the bus breaker box BHB, rectified traction current is output through the main disconnecting switch box MS, the transfer switch box CS, the high-voltage electrical box HV, the filter reactor FL and the traction inverter VVVF to provide kinetic energy for the traction motor and drive the vehicle to run, and the circuit is shown in fig. 5, wherein the lithium battery traction bus and the third rail 750V bus are connected to the transfer switch box CS in parallel.
When the lithium battery is used for emergency power supply, the vehicle obtains the energy of the lithium battery through the transfer switch box CS, as shown in fig. 6, the transfer switch box CS of the M \ M1\ M three-section motor vehicle and the DC/DC converter of the T vehicle are connected to a 750V circuit together through the lithium battery traction bus, the driving electric energy is output through the lithium battery box BT of the T vehicle and the DC/DC converter, and the driving electric energy is transmitted to the M \ M1\ M three-section motor vehicle through the bus.
The main circuit of the lithium battery power supply is designed as shown in fig. 4, when emergency traction is performed, the lithium battery box is inverted and boosted to 750V voltage through the DC/DC converter, and the voltage is transmitted to the bus through the auxiliary isolating switch box IVS to supply power to traction equipment. When the lithium battery is charged, current is connected to the DC/DC converter through the bus auxiliary isolating switch box IVS, and the lithium battery is charged after rectification and voltage transformation.
In summary, the hybrid power supply circuit disclosed in the embodiment of the invention solves the technical problems of emergency traction of the vehicle through a long-distance ramp, safe garage transfer and reasonable control of the power supply mode when the third rail of the urban railway vehicle is powered off or passes through a special dead zone. Meanwhile, the problems of short cycle life, low energy density, large volume and weight, low power density and the like of the energy storage element are solved, and energy storage and output of the energy storage element are reasonably controlled.
It should be particularly pointed out that various components or steps in the above embodiments can be mutually intersected, replaced, added or deleted, and therefore, the reasonable permutation and combination changes also belong to the protection scope of the invention, and the protection scope of the invention should not be limited to the embodiments.
The above is an exemplary embodiment of the present disclosure, and the order of disclosure of the above embodiment of the present disclosure is only for description and does not represent the merits of the embodiment. It should be noted that the discussion of any embodiment above is exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to those examples, and that various changes and modifications may be made without departing from the scope, as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (6)
1. A third rail and lithium battery hybrid power supply circuit is characterized by comprising:
under the emergency condition that the third rail has no network voltage, the electric energy required by the emergency traction of the vehicle is supplied by an emergency traction lithium battery; and the number of the first and second electrodes,
the power supply conversion between the third rail and the lithium battery is controlled by a change-over switch box;
a lithium battery traction bus and a third rail bus are connected into the transfer switch box in parallel, and K1 in a power supply mode switch is used for connecting a three-rail position in the transfer switch box; the current enters a bus breaker box of the motor car through a current collector and is further connected to a three-rail circuit of a change-over switch box, a K1 contact of the change-over switch box is closed, the current flows into a high-voltage electrical appliance box and a filter reactor, is input to a traction inverter, and is rectified to output the current required by a traction motor so as to provide kinetic energy for the traction motor;
under normal working conditions, the converter transforms the voltage obtained from the third rail bus to the voltage for charging the lithium battery, and provides electric energy for charging the lithium battery;
k2 in the power supply mode switch is used for connecting a lithium battery position; in the emergency situation that the third rail has no network voltage, after K2 in the power supply mode switch is connected with a lithium battery position, a lithium battery box is connected to a bus of the whole vehicle through an auxiliary isolating switch box after being boosted through a converter to supply power to traction equipment; in the emergency situation of the third rail without network voltage, the emergency load of the vehicle auxiliary system is powered by the alkaline storage battery; the power supply mode switch is rotated to a battery position, a lithium battery box positioned on the trailer is boosted to 750V voltage through a converter, and the boosted voltage is transmitted to a bus of the whole vehicle through an auxiliary isolating switch box to supply power to the traction equipment; the lithium battery traction bus is transmitted from the trailer to a traction main loop of the motor car and is connected into a battery circuit of a change-over switch box of the motor car, a K2 contact is closed, and current flows into a high-voltage electrical box and a filter reactor and is input to a traction inverter.
2. The hybrid power supply circuit of claim 1, wherein the transfer switch box is disposed on a motor car.
3. The hybrid power supply circuit of claim 1, wherein the lithium battery is disposed on a trailer, and the converter and the auxiliary isolation switch box are disposed on the trailer.
4. The third rail and lithium battery hybrid power supply circuit according to claim 2, wherein after the K2 in the power supply mode switch is connected to the lithium battery level, the brake resistor blower contactor is turned off, and the brake resistor box is turned off.
5. The hybrid power supply circuit of claim 1, wherein the lithium battery is charged during a stop or coasting phase of the vehicle.
6. The power supply circuit of claim 1, wherein the third rail current is connected to the converter through the auxiliary isolation switch box, and the third rail current is rectified and transformed to charge the lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910524925.9A CN110228372B (en) | 2019-06-18 | 2019-06-18 | Third rail and lithium battery hybrid power supply circuit |
Applications Claiming Priority (1)
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| CN113665361B (en) * | 2020-04-30 | 2023-05-09 | 比亚迪股份有限公司 | Vehicle high-voltage power supply system, control method thereof and vehicle |
| CN113060172A (en) * | 2021-03-10 | 2021-07-02 | 交控科技股份有限公司 | Air conditioning system of wisdom train high pressure energy storage formula power supply |
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| CN115556777A (en) * | 2022-10-14 | 2023-01-03 | 中车大连机车车辆有限公司 | Power supply system and method for connecting auxiliary circuit of EMU power car with train supply circuit |
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| CN102991363B (en) * | 2012-12-07 | 2015-08-05 | 南车株洲电力机车有限公司 | A kind of storage battery of city rail vehicle and pantograph tractive power supply system |
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