CN107128183A - A kind of electric EMU is met an urgent need tractive power supply system - Google Patents
A kind of electric EMU is met an urgent need tractive power supply system Download PDFInfo
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- CN107128183A CN107128183A CN201710363844.6A CN201710363844A CN107128183A CN 107128183 A CN107128183 A CN 107128183A CN 201710363844 A CN201710363844 A CN 201710363844A CN 107128183 A CN107128183 A CN 107128183A
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- alternating current
- link
- phase alternating
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- power supply
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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
- B60L9/00—Electric propulsion with power supply external to the vehicle
- B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
- B60L9/24—Electric propulsion with power supply external to the vehicle using ac induction motors fed from ac supply lines
- B60L9/28—Electric propulsion with power supply external to the vehicle using ac induction motors fed from ac supply lines polyphase motors
-
- 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
Abstract
A kind of electric EMU is met an urgent need tractive power supply system, including：Tractive transformer, for being depressured to contact net high-tension electricity；Two rectifiers, for by the secondary side winding AC rectification of tractive transformer into intermediate DC link voltage；Two inverters, for from intermediate DC link power taking, and are reverse into three-phase alternating current；Two-way AuCT, for from intermediate DC link power taking, and is reverse into three-phase alternating current, or after bidirectional charger power taking, boosting is rectified into the voltage of intermediate DC link；Assistant load, for obtaining three-phase alternating current from two-way AuCT or bidirectional charger by assistant load power supply buses；Bidirectional charger, for obtaining three-phase alternating current from two-way AuCT three-phase alternating current outlet side, and by three-phase alternating current step-down rectifier into direct current, powered to connected lithium titanate battery and DC load, or for from lithium titanate battery power taking, boosting is reverse into three-phase alternating current, is powered to AuCT.
Description
Technical field
The present invention relates to electric EMU Traction Drive and control field, and in particular to a kind of emergent traction of electric EMU is supplied
Electric system.
Background technology
Electric EMU in the process of running, because many reasons such as electric power system failure, non-Electric region traveling, special weather may
Electric EMU can be caused to have a power failure.Under power down mode, electric EMU can only be parked on circuit and wait for rescue, during rescue, electronic
Control, emergency lighting and emergency ventilation electricity consumption of the car group by the battery offer of its own in emergency circumstances, but existing storage
Battery capacity can not meet long-time control, emergency lighting and emergency ventilation demand, when occurring power-off fault, in Yi Yin compartments
The factors such as high temperature, anoxic cause live confusion, there is potential safety hazard.
The content of the invention
Met an urgent need tractive power supply system the embodiments of the invention provide a kind of electric EMU, with normal conditions, emergent work
Realizing bidirectional electric energy flow can be realized under condition and under loopback operating mode of requiring assistance, the normal or emergency operating of electric EMU is maintained.
To achieve these goals, the embodiments of the invention provide a kind of emergent tractive power supply system of electric EMU, the electricity
The emergent tractive power supply system of EMUs includes：
Tractive transformer, contact net is connected by High-Voltage Electrical Appliances such as pantographs, for being depressured from contact net power taking；
Two rectifiers, are respectively connecting to the tractive transformer, for the secondary side winding of the tractive transformer to be handed over
Electric rectification is flowed into the voltage of intermediate DC link；
Two inverters, are connected to intermediate DC link, for from the intermediate DC link power taking, and are reverse into three-phase
Alternating current, is rotated with controlled motor；
Two-way AuCT, is connected to intermediate DC link, for from the intermediate DC link power taking, and is reverse into
Three-phase alternating current, or after bidirectional charger power taking, boosting is rectified into the voltage of intermediate DC link；
Bidirectional charger, the two-way AuCT is connected to by assistant load power supply buses, for from described pair
Three-phase alternating current is obtained to AuCT, and by three-phase alternating current decompression drop direct current, to connected lithium titanate battery
And DC load is powered, or for from lithium titanate battery power taking, boosting to be reverse into three-phase alternating current, to the two-way auxiliary converter
Device is powered；
Assistant load, is connected to the two-way AuCT, for by assistant load power supply buses, (3AC380V to be female
Line) obtain three-phase alternating current from the two-way AuCT or the bidirectional charger.
In one embodiment, under traction state, the tractive transformer is by High-Voltage Electrical Appliances such as pantographs from the contact
Net power taking be depressured, the rectifier by the secondary side winding AC rectification of the tractive transformer into intermediate DC link electricity
Pressure；The inverter is reverse into the connected motor rotation of three-phase alternating current electric control after the intermediate DC link power taking；
The two-way AuCT is reverse into three-phase alternating current and supplies electricity to the assistant load confession after the intermediate DC link power taking
The three-phase alternating current electric rectification that the two-way AuCT inversion is obtained is depressured into after DC voltage by electricity, the bidirectional charger
Powered to the DC load and lithium titanate battery.
In one embodiment, without external high pressure, under walking state, the bidirectional charger is by the direct current of lithium titanate battery
Voltage is reverse into three-phase alternating current and supplies electricity to the two-way AuCT and assistant load power supply buses；The two-way AuCT
The three-phase alternating current that the bidirectional charger inversion is obtained is rectified into the DC voltage needed for the intermediate DC link；It is described
Inverter is obtained after DC voltage from the intermediate DC link, is reverse into the rotation of three-phase alternating current electric control traction electric machine；It is described
Assistant load and DC load enter emergency pattern, maintain setting loaded work piece.
In one embodiment, the setting load includes：Cooling system, control system, emergency ventilation, emergency lighting.
In one embodiment, under rescue loopback state, the dc source of lithium battery is reverse into three by the bidirectional charger
Cross streams supply electricity to the two-way AuCT and assistant load bus provides input；The two-way AuCT intersects three
Flow the DC voltage needed for electric rectification into intermediate DC link；The inverter after the intermediate DC link power taking, for
Its motor excitation connected, and after the completion of excitation, the electric power generation is controlled, maintain DC link voltage；It is described two-way
AuCT is powered after intermediate DC link power taking to the assistant load and bidirectional charger.
In one embodiment, the intermediate DC link includes：LC filters, DC support electric capacity, grounded inspection circuit
And excess voltage protection, the LC filters, DC support electric capacity, grounded inspection circuit and excess voltage protection are simultaneously
Connection is connected to the positive and negative two ends of medium voltage.
In one embodiment, the LC filters are made up of inductance and the first electric capacity.
In one embodiment, the DC support electric capacity constitutes capacitance group by multiple second electric capacity, delays for filtering with energy
Punching.
In one embodiment, the grounded inspection circuit is made up of first resistor, second resistance and the 3rd electric capacity, for equipment
Earthing detection.
In one embodiment, the excess voltage protection is made up of transistor and 3rd resistor, passes through the transistor
Open and turn off, maintain medium voltage.
Met an urgent need tractive power supply system using the electric EMU of the embodiment of the present invention, can in normal conditions, emergent operating mode
Realizing bidirectional electric energy flow can be realized under lower and loopback operating mode of requiring assistance, the normal or emergency operating of electric EMU is maintained.Overcome existing
Have needs rescue under the malfunctions such as power failure in technology, battery capacity can not meet long-time emergency lighting and emergency ventilation demand
The problem of, and caused by the factor such as high temperature, anoxic in compartment live confusion etc. safety problem.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the emergent tractive power supply system of electric EMU of the embodiment of the present invention；
Fig. 2 is electric energy trend of the emergent tractive power supply system of electric EMU of the embodiment of the present invention under normal traction state
Schematic diagram；
Fig. 3 for the embodiment of the present invention electric EMU meet an urgent need tractive power supply system without external high pressure under walking state
Electric energy moves towards schematic diagram
Fig. 4 is electric energy trend of the emergent tractive power supply system of electric EMU of the embodiment of the present invention under rescue loopback state
Schematic diagram；
Fig. 5 is the structural representation of the intermediate DC link 105 of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the structural representation of the emergent tractive power supply system of electric EMU of the embodiment of the present invention, as shown in figure 1, should
The emergent tractive power supply system 100 of electric EMU includes：
Tractive transformer 101, contact net 102 is connected by High-Voltage Electrical Appliances such as pantographs, for being dropped from the power taking of contact net 102
Pressure.
Two rectifiers 103, are respectively connecting to tractive transformer 101, for the secondary side winding of tractive transformer 101 to be handed over
Electric rectification is flowed into the voltage of intermediate DC link 105, or from the power taking of intermediate DC link 105, is reverse into single-phase alternating current and is passed through
Tractive transformer 101 feeds back to contact net 102.In one embodiment, rectifier 103 is four-quadrant rectifier.
Two inverters 104, are connected to intermediate DC link 105, then inverse for from the power taking of intermediate DC link 105
Become three-phase alternating current, to control connected motor M to rotate, or from power taking at motor M, be rectified into intermediate DC link
105 voltage.
Two-way AuCT 106, is connected to intermediate DC link 105, for from the power taking of intermediate DC link 105, so
After be reverse into three-phase alternating current, powered to assistant load 107 and bidirectional charger 108, or from the power taking of bidirectional charger 108, rise
Pressure is rectified into direct current, is powered to intermediate DC link 105.
Bidirectional charger 108, two-way auxiliary converter is connected to by assistant load power supply buses (3AC380V buses) 111
Device 106, for obtaining three-phase alternating current from two-way AuCT 106, and by three-phase alternating current decompression drop direct current, gives it
The lithium titanate battery 109 and DC load 110 of connection are powered；Or from the connected power taking of lithium titanate battery 109, inversion of boosting
Into three-phase alternating current, powered to two-way AuCT 106.
Assistant load 107, two-way AuCT is connected to by assistant load power supply buses (3AC380V buses) 111
106 and bidirectional charger 108, for obtaining three-phase alternating current at two-way AuCT 106 or bidirectional charger 108.
In Fig. 1,100 be the emergent traction power supply system of electric EMU with the dotted line frame on right side 100 in the dotted line frame in left side
System.
The emergent tractive power supply system of the electric EMU of the embodiment of the present invention can work under normal traction state, and Fig. 2 is
Emergent electric energy of the tractive power supply system under normal traction state of the electric EMU of the embodiment of the present invention moves towards schematic diagram.Such as Fig. 2
Arrow trend shown in, under traction state, under normal traction state, electric EMU can pass through electricity from contact net power taking
The emergent tractive power supply system of EMUs gives lithium titanate battery to charge.Specifically, tractive transformer 101 passes through the high-tension electricities such as pantograph
Device is depressured from the power taking of contact net 102, and rectifier 103 is by the secondary side winding AC rectification of tractive transformer 101 into intermediate dc
The voltage of link 105；Inverter 104 is reverse into three-phase alternating current electric control connected after the power taking of intermediate DC link 105
Motor M rotates.Two-way AuCT 106 is reverse into three-phase alternating current and supplies electricity to assistant load after the power taking of intermediate DC link 105
The three-phase alternating current electric rectification that the two-way inversion of AuCT 106 is obtained is depressured into direct current by 107 power supplies, bidirectional charger 108
Powered after pressure to the DC load 110 and lithium titanate battery 109.
In one embodiment, the DC voltage after decompression is DC110V voltages, and the present invention is not limited.
The electric EMU of the embodiment of the present invention meet an urgent need tractive power supply system can without external high pressure from work under walking state
Make, no external high pressure from walking state can be such as pantograph and catenary fault, storehouse line non-Electric region.Fig. 3 is electronic for the embodiment of the present invention
The emergent tractive power supply system of car group is moving towards schematic diagram without external high pressure from the electric energy under walking state.Arrow such as Fig. 3 is moved towards
It is shown, without external high pressure under walking state, electric EMU can by electric EMU meet an urgent need tractive power supply system, by metatitanic acid
Lithium battery can be converted to emergent motor when drawing and the electric energy needed for assistant load.Specifically, bidirectional charger 108 is by metatitanic acid
The DC voltage of lithium battery 109 is reverse into three-phase alternating current and supplies electricity to two-way AuCT 106 and the power supply buses of assistant load 107；
The three-phase alternating current that the inversion of bidirectional charger 108 is obtained is rectified into needed for intermediate DC link 105 by two-way AuCT 106
DC voltage；Inverter 104 is obtained after DC voltage from intermediate DC link 105, is reverse into three-phase alternating current electric control traction
Motor rotates；Assistant load 107 and DC load 110 enter emergency pattern, maintain setting loaded work piece.
In one embodiment, setting load includes：Cooling system, control system, emergency ventilation, emergency lighting, decompression
DC voltage afterwards is DC110V voltages, and the present invention is not limited
The emergent tractive power supply system of the electric EMU of the embodiment of the present invention can work under rescue loopback state, rescue back
It can be such as locomotive traction loopback to send state.Fig. 4 is rescuing for the emergent tractive power supply system of electric EMU of the embodiment of the present invention
The electric energy helped under loopback state moves towards schematic diagram.As shown in Fig. 4 arrow trend, solid arrow is that rescue is passed back to motor excitation
Electric energy trend, dotted line for rescue loopback state under rescue loopback electric power generation to auxiliary power supply.Under rescue loopback state, electricity
EMUs can be by the emergent tractive power supply system of electric EMU, excitation needed for lithium titanate battery electric energy is converted into traction electric machine
Electric energy, after the completion of excitation, traction electric machine enters generating state, and generating electricity be able to power to lithium titanate battery, maintains simultaneously
Vehicle aids in electricity consumption.The dc source of lithium titanate battery 109 is reverse into three-phase alternating current by bidirectional charger 108, to two-way auxiliary
Current transformer 106 and assistant load bus 111 is helped to provide input；Three-phase alternating current is rectified into centre by two-way AuCT 106
DC voltage needed for DC link 105；Inverter 104 is after the power taking of intermediate DC link 105, for connected motor M
Excitation, and after the completion of motor M excitations, control motor M to generate electricity, maintain the voltage of intermediate DC link 105；Two-way auxiliary becomes
Device 106 is flowed after the power taking of intermediate DC link 105, is powered to assistant load 107 and bidirectional charger 108.
Fig. 5 is the structural representation of the intermediate DC link 105 of the embodiment of the present invention, as shown in figure 5, intermediate DC link
105 include：LC filters 501, DC support electric capacity 502, grounded inspection circuit 503 and excess voltage protection 504.LC is filtered
Wave apparatus 501, DC support electric capacity 502, grounded inspection circuit 503 and excess voltage protection 504 are connected in parallel in centre
The positive and negative two ends of voltage (A, B two ends).
LC filters 501 are used to be filtered processing, such as Fig. 1, and LC filters 501 are by inductance L1 and the first electric capacity structure
C1 into.
DC support electric capacity 502 is used to filter and energy snubber, as shown in figure 5, DC support electric capacity 502 is by multiple second
Electric capacity C2 constitutes capacitance group.
Grounded inspection circuit 503 is detected for equipment ground, as shown in figure 5, grounded inspection circuit 503 is by first resistor
R1, second resistance R2 and the 3rd electric capacity C3 are constituted, for equipment ground detection.First resistor R1, second resistance R2 and the 3rd electricity
Hold C3 one end ground connection, the first resistor R1 other end connects the other end connection B at A ends, second resistance R2 and the 3rd electric capacity C3
End.
Excess voltage protection 504 being opened and being turned off by the transistor, maintains medium voltage, mistake as shown in Figure 5
Voltage protection circuit 504 is made up of transistor T9 and 3rd resistor R3.
Utilize the embodiment of the present invention electric EMU meet an urgent need tractive power supply system, it is possible to achieve intermediate DC link energy with
Storage battery energy can realize two-way flow, realize that the controllable variable of energy in bidirectional flow is changed.Can in normal conditions, emergent work
Realizing bidirectional electric energy flow can be realized under condition and under loopback operating mode of requiring assistance, the normal or emergency operating of electric EMU is maintained.Overcome
Rescue is needed under the malfunctions such as power failure in the prior art, battery capacity can not meet long-time emergency lighting and emergency ventilation need
The problem of asking, and caused by the factor such as high temperature, anoxic in compartment live confusion etc. safety problem.
The present invention realizes the fast of electric energy using good low temperature characteristic, high power density characteristic and the long-life of lithium titanate battery
Fast charge and discharge and bulk storage, meet electric EMU traction requirements emergent at low temperature.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help to understand the method and its core concept of the present invention；Simultaneously for those of ordinary skill in the art,
According to the thought of the present invention, it will change in specific embodiments and applications, in summary, in this specification
Appearance should not be construed as limiting the invention.
Claims (10)
- The tractive power supply system 1. a kind of electric EMU is met an urgent need, it is characterised in that including：Tractive transformer, contact net is connected by High-Voltage Electrical Appliances such as pantographs, for being depressured from contact net power taking；Two rectifiers, are respectively connecting to the tractive transformer, for by the secondary side winding alternating current of the tractive transformer It is rectified into the voltage of intermediate DC link；Two inverters, are connected to intermediate DC link, for from the intermediate DC link power taking, and are reverse into three-phase alternating current Electricity, is rotated with controlled motor；Two-way AuCT, is connected to intermediate DC link, for from the intermediate DC link power taking, and is reverse into three-phase Alternating current, or after bidirectional charger power taking, boosting is rectified into the voltage of the intermediate DC link；The bidirectional charger, the two-way AuCT is connected to by assistant load power supply buses, for from described pair Three-phase alternating current is obtained to AuCT, and by three-phase alternating current decompression drop direct current, to connected lithium titanate battery And DC load is powered, or for from the lithium titanate battery power taking, boosting to be reverse into three-phase alternating current, to the two-way auxiliary Current transformer is powered；Assistant load, is connected to the two-way AuCT, for by assistant load power supply buses from the two-way auxiliary Current transformer or the bidirectional charger obtain three-phase alternating current.
- The tractive power supply system 2. electric EMU according to claim 1 is met an urgent need, it is characterised in that under traction state, institute State tractive transformer to be depressured from the contact net power taking by High-Voltage Electrical Appliances such as pantographs, the rectifier is by the traction voltage transformation Voltage of the secondary side winding AC rectification of device into intermediate DC link；The inverter is from the intermediate DC link power taking Afterwards, it is reverse into the connected motor rotation of three-phase alternating current electric control；The two-way AuCT is from the intermediate dc ring Save after power taking, be reverse into three-phase alternating current and supply electricity to the assistant load and power, the bidirectional charger is by the two-way auxiliary converter The three-phase alternating current electric rectification that device inversion is obtained is depressured into after DC voltage powers to the DC load and lithium titanate battery.
- The tractive power supply system 3. electric EMU according to claim 1 is met an urgent need, it is characterised in that walked certainly without external high pressure Under row state, the DC voltage of lithium titanate battery is reverse into three-phase alternating current and supplies electricity to the two-way auxiliary change by the bidirectional charger Flow device and assistant load power supply buses；The three-phase alternating current that the two-way AuCT obtains the bidirectional charger inversion It is rectified into the DC voltage needed for the intermediate DC link；The inverter obtains DC voltage from the intermediate DC link Afterwards, it is reverse into the rotation of three-phase alternating current electric control traction electric machine；The assistant load and DC load enter emergency pattern, dimension Hold setting loaded work piece.
- The tractive power supply system 4. electric EMU according to claim 3 is met an urgent need, it is characterised in that the setting load bag Include：Cooling system, control system, emergency ventilation, emergency lighting.
- The tractive power supply system 5. electric EMU according to claim 1 is met an urgent need, it is characterised in that in rescue loopback state Under, the dc source of lithium battery is reverse into three-phase alternating current and supplies electricity to the two-way AuCT and auxiliary by the bidirectional charger Load bus provide input；Three-phase alternating current is rectified into the direct current needed for intermediate DC link by the two-way AuCT Pressure；The inverter is after the intermediate DC link power taking, for connected motor excitation, and after the completion of excitation, control The electric power generation is made, DC link voltage is maintained；The two-way AuCT is after intermediate DC link power taking, to institute State assistant load and bidirectional charger is powered.
- The tractive power supply system 6. electric EMU according to claim 1 is met an urgent need, it is characterised in that the intermediate DC link Including：LC filters, DC support electric capacity, grounded inspection circuit and excess voltage protection, the LC filters, direct current Support Capacitor, grounded inspection circuit and excess voltage protection are connected in parallel in the positive and negative two ends of medium voltage.
- The tractive power supply system 7. electric EMU according to claim 6 is met an urgent need, it is characterised in that the LC filters by Inductance and the first electric capacity are constituted.
- The tractive power supply system 8. electric EMU according to claim 6 is met an urgent need, it is characterised in that the DC support electric capacity Capacitance group is constituted by multiple second electric capacity, for filtering and energy snubber.
- The tractive power supply system 9. electric EMU according to claim 6 is met an urgent need, it is characterised in that the grounded inspection circuit It is made up of first resistor, second resistance and the 3rd electric capacity, for equipment ground detection.
- The tractive power supply system 10. electric EMU according to claim 6 is met an urgent need, it is characterised in that the overvoltage protection Circuit is made up of transistor and 3rd resistor, opening and turning off by the transistor, maintains medium voltage.
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| CN109383530A (en) * | 2018-12-05 | 2019-02-26 | 中车长春轨道客车股份有限公司 | A kind of motor-car trailer system that emergency is walked certainly |
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