CN110239359A - The elimination circuit and method of dual current system electric locomotive tractive transformer D.C. magnetic biasing when power supply system switches - Google Patents
The elimination circuit and method of dual current system electric locomotive tractive transformer D.C. magnetic biasing when power supply system switches Download PDFInfo
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- CN110239359A CN110239359A CN201910633367.XA CN201910633367A CN110239359A CN 110239359 A CN110239359 A CN 110239359A CN 201910633367 A CN201910633367 A CN 201910633367A CN 110239359 A CN110239359 A CN 110239359A
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- 230000003137 locomotive effect Effects 0.000 title claims abstract description 75
- 230000009977 dual effect Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008030 elimination Effects 0.000 title claims abstract 4
- 238000003379 elimination reaction Methods 0.000 title claims abstract 4
- 238000004804 winding Methods 0.000 claims abstract description 40
- 230000005389 magnetism Effects 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims description 17
- 230000007935 neutral effect Effects 0.000 claims description 14
- 238000004146 energy storage Methods 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000005347 demagnetization Effects 0.000 claims description 2
- 230000001808 coupling effect Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 15
- 230000000694 effects Effects 0.000 description 5
- 238000009499 grossing Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
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- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 230000003534 oscillatory effect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 208000032368 Device malfunction Diseases 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
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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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/007—Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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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
- 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
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The present invention provides the elimination circuit and method of a kind of dual current system electric locomotive D.C. magnetic biasing in tractive transformer in power supply system switching, including tractive transformer, four quadrant convertor, traction invertor and single tuning incude filter；It includes inductance L, power tube VT, diode VD, capacitor C, PI controller and switch S that single tuning, which incudes filter,5, in parallel with power tube VT after cathode and capacitor the C series connection of diode VD, the source electrode of power tube VT meets one end of inductance L and the anode of diode VD, the second winding of another termination of inductance L, switch S5In parallel with diode VD, PI controller connects the grid of power tube VT.The present invention is converted by the structure for incuding filter to single tuning, compared to by the forward and reverse continuous alternating of some cycles and gradually being decayed to by alternating current for zero demagnetizing method, as long as the parameter matching of system is appropriate, so that it may realize the purpose for eliminating tractive transformer iron core remanent magnetism.
Description
Technical field
The present invention relates to the straight tractive transformer for handing over dual current system electric locomotive in power supply system is handed over, specifically electric locomotive from
The technology for eliminating of direct current supply standard D.C. magnetic biasing into tractive transformer when the switching of Alternating Current Power Supply standard.
Background technique
With the fast development of China express railway transport development, electric propulsion is by the characteristics of its is efficient, convenient, cleaning
It is being widely used in the field of traffic such as high-speed railway and inter-city passenger rail.Currently, the power supply system of China's rail traffic is basic
Be divided into two kinds: one is the Alternating Current Power Supply standard for high-speed railway and 25kV, 50Hz of inter-city passenger rail, another kind is for city
The direct current supply standard of the 1.5kV (750V) of city's rail traffic subway and light rail.It is asked to solve the interconnection of rail traffic
Topic reduces a large amount of repeated construction engineering, reduces electric locomotive traction and city rail draws the investment cost of comprehensive substation,
Multithread tractive power supply system comes into being.But under the dc power supply system, the tractive winding of Multiple coil tractive transformer fills
When the effect of smoothing reactor, flowing through up to hundreds of amperes of DC current at this time can make transformer generate DC magnetic bias phenomena.
If, when electric locomotive switches from direct current supply standard to Alternating Current Power Supply standard, tractive transformer can be due to surplus without processing
The presence of magnetic and generate very big excitation surge current, seriously threaten the operational safety of electric locomotive.
The DC magnetic bias phenomena of transformer refers to: DC current is flowed into the winding of power transformer, makes transformer
Iron core magnetic bias, change the operating point of transformer.D.C. magnetic biasing has the harm of power transformer bring: (1) noise becomes larger,
The noise of substation is mainly by transformer bring, and the noise of transformer will increase original several times even when D.C. magnetic biasing
Tens times.(2) vibration aggravation, the vibration of transformer body is mainly core vibration caused by silicon steel sheet magnetostriction, and magnetic flux is inclined
Shifting makes exciting current distort, and magnetostriction is caused to aggravate, transformer vibration aggravation the problem of become larger than noise it is even more serious,
Strong vibration can make transformer related components fall off, and pose a serious threat to the safe operation of transformer.(3) loss increases
Add, the loss of transformer has core loss and winding loss, and under the action of DC current, exciting current be will increase, and makes transformation
The winding loss of device increases, while the leakage field of transformer also will increase, when core loss increase.(4) voltage waveform distortion works as iron
Core works at depth saturation region, and exciting current is distorted, and leakage magnetic flux increases, and pinnacle waveform is presented in main flux, makes voltage wave
Shape distortion will lead to protective relaying device malfunction, causes capacitor group and static passive compensation device (SVC) to be overloaded, causes
Generator hot-spot and mechanical oscillation cause high voltage DC power transmission converter station end alternating current filter to overload.When more in system
Platform transformer simultaneously by D.C. magnetic biasing when, will cause the total reactive requirement of system and be significantly increased, system voltage it is possible that
Catastrophic fluctuation threatens to the stable operation of system.
The tractive power supply system of dual current system electric locomotive includes direct current standard and exchange standard, as shown in Figure 1, working as electric power machine
When vehicle operates in AC Condition, electric locomotive obtains alternating voltage from ac contactor net by exchange pantograph, by vehicle-mounted change
High Level AC Voltage is depressured and is input in single-phase four quadrant convertor at satisfactory voltage class by depressor, exports direct current
Then DC voltage is reverse into three-phase alternating current by traction invertor and supplies traction electric machine by pressure；When electric locomotive operates in
When direct current operating condition, electric locomotive by direct current pantograph from direct current contact net obtain DC voltage, by transformer it is secondary around
Group provides DC voltage directly to inversion unit, i.e. the secondary winding of transformer is served as smoothing reactor under direct current operating condition and made
With realizing the multifunctional multiplexing of transformer, improve the utilization rate of electric locomotive equipment.Neutral section is electric locomotive in double fluid
The transition stage switched under standard is stayed for remanent magnetism of the electric locomotive when direct current operating condition is switched to AC Condition in eliminating transformer
Lower time margin.
Since the DC magnetic bias phenomena in traction transformer of electric locomotive is not by the direct current of inflow transformer neutral point
Caused by stream, so common D.C. magnetic biasing administering method: neutral point series resistor, neutral point serial capacitance, neutral point concatenation
Capacitance-resistance etc. is not available in multithread standard electric locomotive, and the demagnetizing method for being currently used for multithread electric locomotive mainly has direct current
Magnetic method and two kinds of AC demagnetization method are gone, but is required to generate the equipment of electric current or voltage that amplitude gradually decays, is unfavorable for
Save the resource distribution of the vehicle-mounted tractive power supply system of electric locomotive.How to make full use of in traction drive original equipment and
Element realizes that degaussing effect has important engineering and theoretical value.
Summary of the invention
In order to solve the problems, such as that structure is complicated, inconvenient for demagnetizer in the prior art, the invention proposes a kind of double
The technology for eliminating of stream electric locomotive tractive transformer D.C. magnetic biasing when power supply system switches, draws in existing double-current system and supplies
In electric system, the structure of single tuning induction filter is carried out converting a last available second order decay oscillating circuit,
Realize degaussing.
The purpose of the present invention is what is realized using following technical scheme:
The tractive power supply system of dual current system electric locomotive mainly includes tractive transformer, four quadrant convertor and traction inversion
Device, as shown in Figure 1, traction drive is the important feature of dual current system electric locomotive.In order to improve the benefit in electric locomotive space
With rate, two sets of transmission systems of traditional dual current system electric locomotive are integrated in one by novel dual current system electric locomotive traction drive
In set system, and a controller is only needed, is that idle vehicle-mounted traction is become under direct current operating condition in place of main difference
The tractive winding of depressor as DC flat-wave reactor use, but in this way caused by consequence will be caused to tractive transformer sternly
The iron core remanent magnetism of weight, what the present invention introduced goes magnetic technology as follows:
As shown in Fig. 2, working as breaker S1、S4It disconnects, S2、S3When closure, electric locomotive is operated under AC Condition, traction
The secondary winding side of transformer can concatenate one or more single tuning induction filters, and the principle using induction filtering can have
The specific subharmonic current for generating valve side of effect is introduced into filter, prevents harmonic current from entering net side to power grid quality
It pollutes, improves the power quality of net side.
Single tuning filter is made of an inductance and capacity cell, as shown in Fig. 2, switch S5Closure, switch
When pipe VT does not have start pulse signal, a single tuning induction filter is constituted, can be filtered by the design to LC parameter
The specific subharmonic current generated except valve side.
Breaker S1、S4Closure, S2、S3When disconnection, electric locomotive is operated under direct current operating condition, and direct current pantograph will obtain
DC voltage by the secondary winding of tractive transformer directly to inverter power supply, wherein the secondary winding of tractive transformer is filled
When the smoothing reactor effect of DC side, but the winding that very big DC current enters transformer is had, generates iron core tight
The D.C. magnetic biasing of weight.
The structure of single tuning filter is converted, by its topology at a boost chopper, as shown in Fig. 2,
Switch S5It disconnects, switching tube VT obtains start pulse signal, that is, constitutes a boost boost chopper.
Using the coupled relation between transformer winding, when DC voltage passes through tractive transformer secondary winding, in inverter
Voltage fluctuation can be generated under the action of switch, can generate induced electromotive force, induction electric in the second winding 3 of tractive transformer
The size of gesture depends on the ripple size of inverter side voltage.
Induced electromotive force in second winding 3 can be by the potential at its both ends under the action of boost boost chopper
It is raised to certain value, realizes the energy storage of capacitor, the control method that boost circuit uses is voltage list closed-loop control.
When electric locomotive is switched to Alternating Current Power Supply standard from direct current supply standard, centre have a distance belong to without
Electric region, electric locomotive must pass through by coasting.
Electric locomotive needs the regular hour by not charged region in coasting, and this period is electric locomotive from DC system
The remanent magnetism of tractive transformer eliminate when formula is switched to exchange standard and provides sufficient time margin.
When coasting passes through not charged region, the first winding 2 of tractive transformer is unable to direct short-circuit, otherwise due to winding
Internal resistance very little can generate a very big dash current, it usually needs series connection resistance R one small constitutes the decaying of RLC order Oscillating
Circuit, the value of R need to meetAs shown in Fig. 2, switch S6Closure, the circuit reduction Cheng Dan of 3 side of the second winding
Tuning induction filter, constitutes a second order decay oscillation circuit using the coupling between transformer winding.
Since the capacitor C in single tuning induction filter has carried out energy storage, it can release energy, pass through the electricity of transformer bay
Magnetic coupling interaction can generate the alternating current of an oscillatory extinction in the first winding 2.
The alternating current of the oscillatory extinction of generation can make to arrange orderly small magnetic pole molecule in tractive transformer iron core again
Rambling state is returned to, to realize the purpose that tractive transformer iron core remanent magnetism is eliminated.
Compared with prior art, the invention has the following beneficial effects: the present invention by incuding filter to single tuning
Structure converted, compared to the degaussing side for by the forward and reverse continuous alternating of some cycles and gradually decaying to zero by alternating current
It for method, only needs to design the parameter of LC here, it is made to meet locomotive operation single tuning induction filter in Alternating Current Power Supply standard
Wave apparatus can eliminate the specific subharmonic of current transformer generation, while meet locomotive operation boost electricity in direct current supply standard
The voltage at the both ends capacitor C can be raised to given value by road, so that it may realize the purpose for eliminating tractive transformer iron core remanent magnetism.This hair
Bright degausser has sufficiently been multiplexed the equipment in system in single tuning induction filter, increases demagnetizer without additional,
The volume and weight for reducing occupancy needed for magnetic machine in the extremely limited space of electric locomotive, mitigates to a certain extent
The weight and cost of locomotive, improve utilization rate, the economy of device.
Detailed description of the invention
Fig. 1 is dual current system electric locomotive Traction Drive power supply system schematic diagram in the prior art；
Fig. 2 is dual current system electric locomotive tractive transformer degaussing systematic schematic diagram of the invention, wherein 1,2,3 respectively indicate
The primary side winding of tractive transformer, secondary the first winding of side and the second winding.
Specific embodiment
Below with reference to embodiment, the present invention will be further described.
When dual current system electric locomotive is switched to Alternating Current Power Supply standard from direct current supply standard, the secondary winding of tractive transformer
DC current generation D.C. magnetic biasing can be flowed by serving as DC side smoothing reactor.The purpose of the invention is to eliminate traction voltage transformation
Remanent magnetism in device improves the security and stability of electric locomotive.With reference to the accompanying drawing to the objectives, technical solutions, and advantages of the present invention
Make further description:
As shown in Figure 1, when being that dual current system electric locomotive operates in exchange standard Traction networks and direct current standard Traction networks respectively
The schematic diagram of traction drive, wherein electric locomotive is not charged at neutral section region, locomotive needs to pass through by coasting.
Only when electric locomotive is switched to Alternating Current Power Supply standard from direct current supply standard, in the winding of tractive transformer
It will appear iron core remanent magnetism, need to eliminate remanent magnetism in this time in electric locomotive coasting by neutral section；Work as electric power
It is not in iron core remanent magnetism, nothing in the winding of tractive transformer when locomotive is switched to direct current supply standard from Alternating Current Power Supply standard
It need to carry out remanent magnetism processing.
When electric locomotive operates in Alternating Current Power Supply standard, as shown in Fig. 2, i.e. breaker S1、S4It disconnects, S2、S3Closure,
It is identical with the straight alternating current power locomotive work principle of traditional friendship at this time, alternating current is obtained from ac contactor net by exchange pantograph
Pressure, is then depressured into satisfactory voltage class by tractive transformer and is input in single-phase four quadrant convertor, passed through
Three-phase alternating current supply traction electric machine is obtained using inverter after intermediate DC voltage-stabilizing.
In order to improve net side power quality, the harmonic current of valve side is avoided to enter ac tracting network, the pair of tractive transformer
Side would generally concatenate one or more single tuning induction filters, and single tuning filter is by an inductance and capacity cell structure
At, as shown in Fig. 2, switch S5Closure, switching tube VT do not have start pulse signal, that is, constitute a single tuning induction filtering
Device can effectively eliminate the specific subharmonic current of valve side generation, prevent it from entering net side.
Simple transformation is carried out to the structure of single tuning filter, it can be by its topology at a boost chopper, such as
Shown in Fig. 2, switch S5It disconnects, switching tube VT connects start pulse signal, that is, constitutes a boost boost chopper, benefit
Energy storage can be carried out to capacitor C with the principle of boost circuit, the capacitor C both end voltage finally obtained are as follows:
VC=Vd/(1-D)
Wherein D is the duty ratio of switching tube VT make pulse trigger signal, VdIt is the input voltage of boost circuit.
When electric locomotive operates in direct current supply standard, as shown in Fig. 2, i.e. breaker S1、S4Closure, S2、S3It disconnects,
Electric locomotive obtains DC voltage from direct current contact net by direct current pantograph, by the secondary winding of transformer directly to inversion
Unit provides DC voltage, and wherein the secondary winding of transformer serves as smoothing reactor use, realizes the multi-functional of transformer
Multiplexing.
It is acted on using the electromagnetic coupling between transformer winding, when DC voltage passes through tractive transformer secondary winding,
Voltage can fluctuate under the influence of inverter switching device variation, and induction then can be generated in the second winding 3 of tractive transformer
Electromotive force, the ripple size for depending mainly on the size of inverter side voltage of induced electromotive force.
When electric locomotive is switched to Alternating Current Power Supply standard from direct current supply standard, it is intermediate can by a distance without
Electric region, electric locomotive need to pass through by coasting, and this period is switched to exchange from direct current supply standard for electric locomotive and supplies
The remanent magnetism of tractive transformer eliminate when electric standard and provides sufficient time margin.
Described above is the operation logic and system configuration of dual current system electric locomotive, below to electric locomotive from DC system
The remanent magnetism removing method of tractive transformer is described when formula is switched to exchange standard:
Sense when electric locomotive operates in direct current supply standard, needs to be switched to Alternating Current Power Supply standard, in electric locomotive
Answer device that can receive a trigger signal by the induced magnet device by rail when will enter neutral section, control after
Electric appliance makes dc circuit breaker S1、S4It disconnects, S5、S6Closure, the landing of direct current pantograph, boost circuit switch pulse signal disappear.
Since the capacitor C in single tuning induction filter has been obtained surely when electric locomotive operates in direct current supply standard
Constant voltage, such electric locomotive is when coasting enters neutral section, as shown in Fig. 2, the first winding 2 of tractive transformer and
Since the effect of electromagnetic coupling will form an oscillation degaussing circuit, the alternating current of the oscillatory extinction of generation can make two windings 3
The orderly small magnetic pole molecule of arrangement comes back to rambling state in tractive transformer iron core, to realize tractive transformer
The purpose that iron core remanent magnetism is eliminated.
Induction when electric locomotive coasting passes through neutral section and will enter the operation of Alternating Current Power Supply standard, in electric locomotive
Device can receive a trigger signal by the induced magnet device by rail when will enter ac tracting network, control
Relay makes AC circuit breaker S2、S3Closure, S6It disconnects, exchange pantograph rises, and is free of remanent magnetism, electricity in tractive transformer at this time
Power locomotive can operate normally.
When electric locomotive operates in Alternating Current Power Supply standard, switch S5Closure, the no pulse letter of the switch of boost circuit
Number, then the specific subharmonic current that valve side can be generated by constituting a single tuning induction filter is eliminated, and valve is prevented
Side harmonic current enters net side, threatens to power supply system safe operation.
Sense when needing to be switched to direct current supply standard from Alternating Current Power Supply standard when electric locomotive operation, in electric locomotive
Answer device that can receive a trigger signal by the induced magnet device by rail when will enter neutral section, control after
Electric appliance movement makes AC circuit breaker S2、S3It disconnects, then exchanges pantograph landing, electric locomotive coasting passes through neutral section.Due to before this
Electric locomotive operates under Alternating Current Power Supply standard, and iron core remanent magnetism will not be generated in tractive transformer, without carrying out remanent magnetism processing.
Inductor meeting when electric locomotive coasting passes through neutral section and will enter the operation of direct current operating condition, in electric locomotive
One trigger signal is received by the induced magnet device by rail when will enter DC Traction Network, controls relay
Device makes dc circuit breaker S1、S4Closure, switch S5It disconnects, direct current pantograph rises, the switch connection trigger pulse of boost circuit
Signal carries out energy storage to capacitor C, eliminates and lead when being switched to Alternating Current Power Supply standard from direct current supply standard for electric locomotive next time
The iron core remanent magnetism drawn in transformer is prepared, and is moved in circles with this.
Being exactly above dual current system electric locomotive from direct current supply standard is switched to Alternating Current Power Supply standard and from AC power supply system
Formula is switched to the breaker actuation process of direct current supply standard and the removing method of tractive transformer iron core remanent magnetism.
Claims (3)
1. the elimination circuit of dual current system electric locomotive D.C. magnetic biasing in tractive transformer when power supply system switches, including traction become
Depressor, the first winding of the secondary winding side of tractive transformer connect four quadrant convertor, traction invertor, and the second winding concatenation is single
Tuning induction filter；It is characterized in that, the single tuning induction filter includes inductance L, power tube VT, diode
VD, capacitor C, PI controller and switch S5, power tube VT in parallel with power tube VT after cathode and capacitor the C series connection of diode VD
Source electrode meet one end of inductance L and the anode of diode VD, the second winding of another termination of inductance L, switch S5With diode VD
Parallel connection, PI controller connect the grid of power tube VT.
2. the dual current system electric locomotive according to claim 1 D.C. magnetic biasing in tractive transformer when power supply system switches
Eliminate circuit, which is characterized in that further include resistance R and switch S6, first winding, resistance R and switch S6Constitute series electrical
Road.
3. D.C. magnetic biasing in the tractive transformer for eliminating circuit based on D.C. magnetic biasing in tractive transformer described in claim 2
Removing method, which comprises the steps of:
Step 1: the switch S when electric locomotive operates in direct current supply standard5It disconnects, switching tube VT connects start pulse signal, i.e.,
A boost boost chopper is constituted, energy storage is carried out to capacitor C using the principle of boost circuit；
Step 2: when electric locomotive is switched to Alternating Current Power Supply standard from direct current supply standard, switch S5With switch S6Closure, switch
Pipe VT break trigger pulse signal, within the time that electric locomotive coasting passes through neutral section, using between tractive transformer winding
Electromagnetic coupling effect and the capacitor C Jing Guo energy storage form a second order decay oscillation demagnetization circuit, in the transformer traction winding
Ringing current is generated, the magnetic potential generated using ringing current realizes the elimination to transformer core remanent magnetism.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910633367.XA CN110239359B (en) | 2019-07-15 | 2019-07-15 | Circuit and method for eliminating direct current magnetic bias of traction transformer of double-current system electric locomotive during switching of power supply systems |
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| CN201910633367.XA CN110239359B (en) | 2019-07-15 | 2019-07-15 | Circuit and method for eliminating direct current magnetic bias of traction transformer of double-current system electric locomotive during switching of power supply systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111645718A (en) * | 2020-07-01 | 2020-09-11 | 中车洛阳机车有限公司 | AC contact net and DC contact net double-power-supply rail flaw detection vehicle |
| TWI836501B (en) * | 2022-07-06 | 2024-03-21 | 致茂電子股份有限公司 | Transformer device |
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| CN111645718B (en) * | 2020-07-01 | 2024-05-24 | 中车洛阳机车有限公司 | Dual-power supply rail flaw detection vehicle for alternating current contact network and direct current contact network |
| TWI836501B (en) * | 2022-07-06 | 2024-03-21 | 致茂電子股份有限公司 | Transformer device |
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| CN110239359B (en) | 2023-03-31 |
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