CN104467455A - Multi-system converter device - Google Patents
Multi-system converter device Download PDFInfo
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- CN104467455A CN104467455A CN201410735027.5A CN201410735027A CN104467455A CN 104467455 A CN104467455 A CN 104467455A CN 201410735027 A CN201410735027 A CN 201410735027A CN 104467455 A CN104467455 A CN 104467455A
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- precharge unit
- direct current
- unit
- charging
- multithread
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a multi-system converter device. The multi-system converter device comprises an alternating current precharge unit and a direct current precharge unit. The input end of the alternating current precharge unit and the input end of the direct current precharge unit are both connected with an overhead line system. The output end of the alternating current precharge unit is connected with a PWM rectifier module. The PWM rectifier module and the direct current precharge unit are both connected with a middle direct current loop. The middle direct current loop is connected with a power supply device through a VVVF inversion module. The alternating current precharge unit and the direct current precharge unit are both connected with a change-over switch. The alternating current precharge unit, the direct current precharge unit, the change-over switch, the PWM rectifier module and the VVVF inversion module are all connected with a drive control unit. Under the traction condition, the multi-system converter device conducts dispatching operation like traction through a traction power supply system; under the braking condition, the multi-system converter device enables regenerative braking energy of a traction motor to be stored and reused through power grid feedback.
Description
Technical field
The present invention relates to track traffic power supply unit, particularly a kind of multithread convertor assembly.
Background technology
External locomotive field extensive market, along with state's railway freight liberalization such as European, African, many network operators use the transit transportation of new expense the best to connect, and the difference that will meet various countries to the locomotive needed for this requires and obtains the approval of these countries.For this reason, operation department proposes the requirement of the standardization of locomotive, standardization, generalization and seriation, develop the multithread traction converter plant adapting to European market, African, the feature of this multithread convertor assembly to adapt to the power supply system difference between zones of different, different country, has wide development space.
Multithread car refers to the train that can run under two or more power supply system.China's track traffic power supply system is mainly divided into two kinds: the AC25kV/50Hz for main line railway power and for the DC1500V(DC750V of urban track traffic city rail subway) power supply.Europe is due to its power supply system more complicated of reason of history, 2 ~ 4 kinds of power supply systems are had between the many neighboring countries in Europe and area, have AC15kV/16.7Hz, AC25kV/50Hz, DC1500V, DC3000V tetra-kinds of supply power modes, the power supply system that american railway adopts is mainly AC12.5kV/60Hz and AC25kV/60Hz two kinds.In order to meet trans-regional, international movement requirement, need to adopt the multithread locomotive that can run under multiple power supply system.
At present, " electrical transmission system for double-power source diesel locomotive (201120185229.9) " propose a kind of dual power source diesel locomotive scheme, this utility model electrical transmission system for double-power source diesel locomotive, effectively can lower the diesel-electric locomotive energy waste of prior art, diesel engine operate power plays inefficient problem.The program is more satisfactory selection as the interim form between conventional internal combustion locomotive and " pure " electric locomotive.This utility model patent application is only confined to diesel locomotive field, and the continuous traction power of lithium battery is less, cannot long-play, and lithium battery useful life is 3-5, the higher and normal utilization demand under can not meeting multiple line voltage standard of cost.
Patent " hybrid power diesel locomotive 200820013138.5 ", proposes a kind of hybrid power diesel locomotive, the energy recovery of program designed path locomotive and control device.Be drive threephase generator to generate electricity by diesel engine, be made into direct current through rectifying device and give DC motor drive locomotive operation.Storage battery and control device thereof is increased between rectifying device and DC motor.This utility model has novel structure, energy-conserving and environment-protective, the feature such as economical and practical, therefore belongs to a kind of and integrate novel hybrid diesel locomotive that is economical and practicality.But the program adopts DC drive system, various aspects of performance, far away not as good as alternating-current actuating system, cannot compare favourably with alternating-current actuating system and normal utilization demand under can not meeting multiple line voltage standard.
Current AC drive locomotive, motor-car and city rail vehicle, all can only run under a kind of line voltage standard, i.e. 25kV/50Hz or DC1500V/750V, and at home, now the slitless connection of main line railway and city rail railway is being attempted in existing urban, this demand current train traction converter plant cannot meet application demand, and in countries and regions such as Europe and South Africa, due to the reason of history, power supply system more complicated, prior art traction converter plant cannot meet the application needs of multivoltage standard, this just needs to develop the traction converter plant being applicable to multiple voltage standard and powering, this kind of convertor assembly automatically can carry out main circuit and function switching under different voltage forms, meet the application needs of multithread car.
Summary of the invention
Technical problem to be solved by this invention is, for above-mentioned the deficiencies in the prior art, provides a kind of multithread convertor assembly.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of multithread convertor assembly, comprise and exchange precharge unit, direct current precharge unit, described interchange precharge unit, direct current precharge unit input are all connected with contact line, and described interchange precharge unit output is connected with PWM rectification module; Described PWM rectification module, direct current precharge unit are all connected with intermediate dc loop; Described intermediate dc loop is connected with power supply unit by VVVF inversion module; Described interchange precharge unit, direct current precharge unit are all connected with change over switch, and described interchange precharge unit, direct current precharge unit, change over switch, PWM rectification module, VVVF inversion module are all connected with motion control unit.
Described direct current precharge unit comprises the first charging contactor and the second charging contactor, described first charging contactor is connected with the first charging resistor, and described second charging contactor is in parallel with the series arm that described first charging contactor, the first charging resistor form; Described first charging resistor accesses described contact line by circuit breaker.Described interchange precharge unit comprises the 3rd charging contactor, the 4th charging contactor; Described 3rd charging contactor, the 4th charging contactor are composed in series series arm with the second charging resistor, the 3rd charging resistor respectively; Two series arms of described interchange precharge unit are in parallel with first line contactor, the second line contactor respectively; Described 3rd charging contactor, the 4th charging contactor are connected with transformer secondary respectively, and described transformer primary side is connected with described contact line.The impact that the big current that direct current precharge unit, interchange precharge unit can effectively reduce electrical network causes support capacitor.
Described intermediate dc loop comprises Support Capacitor; Described Support Capacitor is in parallel with earthing detection unit.Earthing detection unit is mainly used in the detection of intermediate dc loop voltage, sends instruction control PWM rectifying device for motion control unit, maintains the stable of described intermediate dc loop voltage
Described intermediate dc loop also comprises LC filter unit; Filter reactor one end of described LC filter unit is connected with described transformer secondary, and the described filter reactor other end is connected with the secondary resonant capacitance of described LC filter unit.LC filter unit can maintain the stable of intermediate dc loop.
Described secondary resonant capacitance is connected with discharge cell, and discharge cell is for the release by remaining capacity on secondary resonant capacitance.
Described earthing detection unit is in parallel with discharge indicating lamp, and discharge indicating lamp, for observing the discharge scenario of intermediate dc loop Support Capacitor, filtering capacity, for reminding operating personnel when lamp is bright, does not carry out the maintenance activity of described convertor assembly.
Compared with prior art, the beneficial effect that the present invention has is: the present invention, under traction working condition, carries out the traffic controls such as traction by tractive power supply system; Under damped condition, can electrical network feedback be passed through, make traction electric machine regenerating braking energy be stored and reuse.The present invention can meet the railway transportation under different power supply system, and according to the requirement of power supply grid, by changing convertor assembly module capacity, can realize the design of different capacity grade, to meet the needs of different application condition.The demand of different client can be met in different power supply system field, Design and manufacture can be easier to by the program package of locomotive design platform and country variant, different user go out to adapt to Europe, the various different task of African various countries railway and the universal train of rail facility, its development by the high-power multithread train of company's Future Development, enter the technological reserve of carrying out overseas market, be also simultaneously the solution that the slitless connection of domestic main line railway and outmoded conventions railway provides traction converter plant.
Accompanying drawing explanation
Fig. 1 is one embodiment of the invention main circuit diagram;
Fig. 2 is one embodiment of the invention electrical schematic diagram;
Fig. 3 is one embodiment of the invention convertor assembly AC mode control topology figure;
Fig. 4 is one embodiment of the invention flow directing device DC mode control topology figure;
Fig. 5 is one embodiment of the invention change over switch schematic diagram;
Fig. 6 is the switch logic figure between one embodiment of the invention AC mode and DC mode.
Embodiment
Operation principle of the present invention is as follows:
Under AC mode, by traction transformer by line voltage step-down, through PWM rectifier rectification, the direct voltage of stable output, by the alternating current supply traction electric machine that the inversion of VVVF inverter is variable voltage variable frequency, realize the traction work of locomotive, exported the alternating current supply assistant load of variable voltage variable frequency simultaneously by VVVF subordinate inverter, power to other auxiliary equipment of train.Under DC mode, line voltage is without PWM rectifier, so there is no its power consumption, directly pass through LC filter by line voltage filtering, obtain more stable direct current, be the alternating current supply traction electric machine of variable voltage variable frequency by the inversion of VVVF inverter, realize the traction work of train, exported the alternating current supply assistant load of variable voltage variable frequency simultaneously by VVVF subordinate inverter, power to other auxiliary equipment of train.
AC mode and DC mode are switched by change over switch.
Traction transformer is a kind of device of special voltage grade, meet traction load and change violent particular/special requirement, the secondary coil of transformer is furnished with two and exports winding, by the former limit of conversion transformer and time limit turn ratio, when making to power under different contact line conditions, PWM rectification can obtain identical interchange input; The double PWM rectifier corresponding electrical degree that mutually staggers is modulated, and therefore can cancel high-pressure side filter, disturbance current can not over-limit condition.PWM rectifier and transformer time limit winding realize adjustment by means of a change over switch, power stage in single-phase electrical network produces the harmonic current doubling mains frequency in intermediate loop, by the absorption circuit of 33.4Hz, 100Hz design, this harmonic current is absorbed.When DC mode is run, intermediate loop by LC filter with contact electrical network and directly connect, LC filter forms by inputting inductance, transformer time limit winding and intermediate loop electric capacity, and input inductance also can not use traction transformer time limit winding, but adopts the form of separate outer inductance.
For ease of modularization, standardized production, two PWM rectifier of same traction converter plant and VVVF inverter adopt identical phase component, and form the traction current transformation power supply unit of a bogie.In addition, traction converter plant shares an intermediate loop, intermediate circuit is configured with capacitor, LC filter, secondary resonant tank, intermediate voltage detection and earthing detection loop, wherein secondary resonance reactor forms secondary filtering loop under AC mode, under DC mode, jointly form filter reactor L with transformer time limit winding.
As shown in Figure 1, under AC mode, DC link is by PWM rectifier feed; Under DC mode, DC link is directly connected in intermediate loop.This standard for AC and DC750 V(as the rail vehicle run on main line) and AC and DC1500V(as double-current system locomotive) circuit is state-of-the-art technology.According to the IGBT of 6500V, this topological structure is also applicable to the circuit of 3000V.As can be seen here.Same convertor assembly topological structure and control strategy, can be used on the multithread convertor assembly in various voltage type and nearly all power bracket.Such as, when AC and DC 750V, 1500V and 3000V, use the IGBT of 1700V, 3300V, 6500V respectively, module all adopts water-cooling pattern, and operating switch frequency can reach 500 Hz.
In Fig. 1, R1, R2, R3-charging resistor; KM1, KM2, KM3-short circuit contactor; KM4, KM5, KM6-charging contactor; QS1-change over switch; LH1, LH2, LH3, LH4, LH5, LH6-current sensor; 4QS1,4QS2-PWM rectifier; C2-secondary resonant capacitance; R4, R5, R9, R10-discharge resistance; VH1, VH2, VH3, VH4-voltage sensor; LED-voltage indicator lamp; C1-Support Capacitor; RST-copped wave resistance; INV1, INV2, F/INV-VVVF inverter; M1, M2-traction electric machine; T-traction transformer; T3-auxiliary transformer; L2-secondary resonant inductance.
Multithread convertor assembly of the present invention is made up of key modules parts such as single-phase PWM rectifying device, VVVF inverter, TCU motion control unit, change over switch, precharge unit, detecting signal unit, earthing detection unit.
Present invention employs multithread convertor assembly, by the switching of change over switch, go for the work such as the rail traction under different systems, scheduling, meet the transport of trans-regional, international, existing convertor assembly can only adapt to single standard net pressure, main circuit does not have change over switch, can not realize the switching of different systems net pressure operating mode.
Multithread convertor assembly main circuit adopts PWM rectification+VVVF inverter mode; a PWM rectification module is made up of two phase module (half-bridge); VVVF inversion module comprises 3 phase components (each makes a phase component mutually); other 1 phase component in module; an IGBT is as copped wave pipe; another only utilizes its backward diode subparticipation to protect, and its IGBT part is for subsequent use.Double PWM rectifying device and 2 inverters form the power supply unit of whole draw-gear, are that 2 phase asynchronous traction motors are powered.
PWM rectification module and VVVF inversion module adopt modularized design, can exchange completely between the two.
The main circuit of convertor assembly as shown in Figure 1, under AC mode, 25kV 50HZ(15kV 16.7Hz) line voltage through traction transformer step-down be convertor assembly be suitable for voltage, convertor assembly device is from the secondary limit winding (T1 of traction transformer, T2) power taking, after traction converter plant motion control unit (TCU) receives and exchanges command signal, send order to change over switch (Fig. 5), change over switch is switched to and exchanges position, input voltage is first via precharge unit (KM4, R1/KM5, R2), to the electric capacity (C1 of DC loop, C2) charge, current sensor (LH1, LH2) for detecting the size of convertor assembly input current, control topology as shown in Figure 3.During traction working condition, single phase industrial frequence line voltage is the corresponding different net pressure of DC1800V/DC3000V(, different locomotive power requirement through PWM rectification module (4QS1,4QS2) rectification) direct voltage, through VVVF inversion module (INV1, INV2) inversion be three-phase voltage, frequency-adjustable supply traction electric machine (TM1, TM2), be variable voltage variable frequency alternating current through VVVF auxiliary inversion module (F/INV) inversion, through auxiliary transformer (T3) filtering, export to auxiliary system power supply unit; The three-phase voltage that during damped condition, traction electric machine sends feeds back to electrical network after the rectification of VVVF inverter, PWM rectifier inversion, realizes the recycling of energy.
Under DC mode, TCU sends direct current switching command to change over switch (Fig. 5), change over switch is switched to direct current position, DC3000V/DC1500 line voltage is through precharge loop (KM6, R3), after the filtering of LC filter circuit, obtain comparatively galvanic current pressure, to the electric capacity (C1 of DC loop, C2) charge, through VVVF inversion module (INV1, INV2) inversion is three-phase voltage, frequency-adjustable supply traction electric machine (TM1, TM2), be variable voltage variable frequency alternating current through VVVF auxiliary inversion module (F/INV) inversion, through auxiliary transformer (T3) filtering, export to auxiliary system power supply unit, the three-phase voltage that during damped condition, traction electric machine sends feeds back to electrical network after the rectification of VVVF inverter, as line voltage reach certain set point after can open brake resistance, realize the lasting full power braking of DC mode, control topology is as shown in Figure 4.
Switching between AC mode and DC mode is realized by isolation conversion switch.Isolation conversion switch is selected according to the needs of line voltage standard quantity, be described for two line voltage standard below, according to system main circuit diagram 1, needing 3 groups of normally opened contacts (1.5,1.2,1.4) and 3 groups of normally-closed contacts (1.1,1.3,1.6) in this situation altogether, is interlocking between normally open contact and normally closed interlock.The motor control loop element priority of change over switch adopts semiconductor control element of motor, system provides 2 control signal contacts, be respectively AC system signal, DC system signal, the pulse duration 3.5s < t < 4.5s of signal, and 1 electricity allows contact point signal (can be used for DC110V) every operation, can under the operating mode of safety operation at isolating switch, this junction closure.Conversion switch circuit as shown in Figure 5.
As shown in Figure 5, change over switch comprises three parts: main contact (1.1,1.5,1.3; 1.2,1.6,1.4), auxiliary contact (K3, K5, K4, K6) and controller.After changeover switch controller receives the AC and DC order of convertor assembly TCU transmission, control switch main contact and auxiliary contact are switched to corresponding operating state.
Switch logic between multithread convertor assembly AC mode and DC mode as shown in Figure 6.By motion control unit to the switching under each pattern, realize the power transfer under different electric current system, gather each on off state simultaneously, implement the protection to convertor assembly and monitoring.
Under AC mode, contact line traction precharge loop 102 is composed in series respectively by charging contactor KM4, KM5 and charging resistor R1, R2, under traction working condition, by traction power set input AC970V single-phase alternating current, through PWM rectifying device, when motion control unit is DC1370V by intermediate voltage checkout gear (R4, R5 are formed) detection intermediate voltage, closed circuit contactor KM1/KM2(controls simultaneously), disconnect charging contactor (KM4, KM5), complete an intermediate capacitance precharge link.Meanwhile, AC mode input voltage and middle dc voltage can set according to user and project actual needs;
Under DC mode, precharge loop is composed in series by charging contactor (KM6) and charging resistor (R3), charges to intermediate loop Support Capacitor, the impact that the big current effectively reducing electrical network causes capacitor.
Single-phase simple alternating current electric rectification can be constant direct current by PWM rectifying device (4QS1,4QS2), and this rectifying device is made up of two phase module (half-bridge), can for two-way traction input.The output dc voltage of motion control unit control PWM rectification module is stablized, control size and the phase place of convertor assembly net side alternating current, make its close to sinusoidal wave and with line voltage in the same way or anti-phase, the power factor of system is drawn close to 1() or-1(braking).
VVVF inverter (INV1, INV2) is directly coupled with intermediate loop, according to the inversion output order that motion control unit sends, is the three-phase alternating current supply traction electric machine of voltage and frequency-adjustable under traction working condition by described direct voltage inversion; Under damped condition, the three-phase alternating current electric rectification exported by described traction electric machine, inversion feed back to described tractive power supply system; Contain copped wave module in this inverter simultaneously, when shutdown or wheel-slip, carry out quick release and the Overvoltage suppressing of intermediate energy by copped wave resistance (RST), ensure the traffic safety of locomotive.
PWM rectifying device and VVVF inverter adopt water-cooling structure, under meeting high-power condition, and the radiating condition of power component.And two kinds of modular structures are just the same, by regulating the exchange of software simulating function between the two.
Intermediate dc loop includes earthing detection unit (R4, R5), described device adopts two series resistances to realize, this resistance is used for earthing detection, motion control unit is adopted to detect output transducer, when traction power supply loop, when ground connection is born in the positive ground connection of intermediate loop or intermediate loop, resistor neutral voltage imbalance, judged by hardware setting and software, the ground connection waveform of diverse location is compared, failure judgement point, the self-protection of circuit is carried out by the mode of cutting off the electricity supply, this resistance also can be used as the release of intermediate loop Support Capacitor remaining capacity simultaneously.Earthing detection unit is used for the detection of intermediate circuit voltage, sends instruction control PWM rectifying device for motion control unit, maintains the stable of described intermediate circuit voltage.
Intermediate dc loop includes LC filter unit, under AC mode, for 2 subharmonic filterings PWM rectifying device output packet contained, ensures the constant of DC voltage; Under DC mode, transformer time limit winding, secondary resonance reactor and Support Capacitor form DC loop LC filtering jointly, maintain the stable of intermediate loop.
Intermediate dc loop includes secondary capacitor discharge unit (R9), for the release by remaining capacity on secondary resonant capacitance;
VVVF inverter (F/INV) is directly coupled with intermediate loop, for the inversion control instruction sent according to described control device, is constant voltage and frequency, for locomotive assisting system is powered by the DC inverter of described intermediate dc loop input.
Motion control unit is the core cell of convertor assembly; mainly realize the traction/brake control of locomotive, logic control and error protection; realize controlling the real-time control of PWM rectifying device, CVCF inversion module, VVVF inverter and alternating current asynchronous traction electric machine, adhesion utility, meet the requirement of locomotive in the speed of service etc. of power performance, failure operation, rescue ability and expection.
Discharge indicating lamp (LED), for observing the discharge scenario of intermediate loop Support Capacitor, secondary resonant capacitance, for reminding operating personnel when lamp is bright, does not carry out the maintenance activity of described convertor assembly.
The multithread convertor assembly of the embodiment of the present invention, under traction working condition, carries out the traffic controls such as traction by tractive power supply system; Under damped condition, can electrical network feedback be passed through, make traction electric machine regenerating braking energy be stored and reuse.
Claims (7)
1. a multithread convertor assembly, it is characterized in that, comprise and exchange precharge unit, direct current precharge unit, described interchange precharge unit, direct current precharge unit input are all connected with contact line, and described interchange precharge unit output is connected with PWM rectification module; Described PWM rectification module, direct current precharge unit are all connected with intermediate dc loop; Described intermediate dc loop is connected with power supply unit by VVVF inversion module; Described interchange precharge unit, direct current precharge unit are all connected with change over switch, and described interchange precharge unit, direct current precharge unit, change over switch, PWM rectification module, VVVF inversion module are all connected with motion control unit.
2. multithread convertor assembly according to claim 1, it is characterized in that, described direct current precharge unit comprises the first charging contactor and the second charging contactor, described first charging contactor is connected with the first charging resistor, and described second charging contactor is in parallel with the series arm that described first charging contactor, the first charging resistor form; Described first charging resistor accesses described contact line by circuit breaker.
3. multithread convertor assembly according to claim 1 and 2, is characterized in that, described interchange precharge unit comprises the 3rd charging contactor, the 4th charging contactor; Described 3rd charging contactor, the 4th charging contactor are composed in series series arm with the second charging resistor, the 3rd charging resistor respectively; Two series arms of described interchange precharge unit are in parallel with first line contactor, the second line contactor respectively; Described 3rd charging contactor, the 4th charging contactor are connected with transformer secondary respectively, and described transformer primary side is connected with described contact line.
4. multithread convertor assembly according to claim 3, is characterized in that, described intermediate dc loop comprises Support Capacitor; Described Support Capacitor is in parallel with earthing detection unit.
5. multithread convertor assembly according to claim 4, is characterized in that, filter reactor one end of described LC filter unit is connected with described transformer secondary, and the described filter reactor other end is connected with the secondary resonant capacitance of described LC filter unit.
6. multithread convertor assembly according to claim 5, is characterized in that, described secondary resonant capacitance is connected with discharge cell.
7. multithread convertor assembly according to claim 6, is characterized in that, described earthing detection unit is in parallel with discharge indicating lamp.
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| CN105141026A (en) * | 2015-08-21 | 2015-12-09 | 南车青岛四方机车车辆股份有限公司 | Alternating current-direct current conversion control circuit for double-current brake motor train unit |
| CN105459839A (en) * | 2015-11-24 | 2016-04-06 | 唐山轨道客车有限责任公司 | Dual-mode current collecting system and method |
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| CN105539164A (en) * | 2016-01-22 | 2016-05-04 | 株洲南车时代电气股份有限公司 | Double-source electric locomotive converter |
| CN105966266A (en) * | 2016-06-06 | 2016-09-28 | 中车株洲电力机车研究所有限公司 | Main circuit of transmission system |
| CN106671782A (en) * | 2015-11-09 | 2017-05-17 | 中车大连电力牵引研发中心有限公司 | Alternating current electric locomotive traction system |
| CN106712645A (en) * | 2015-11-13 | 2017-05-24 | 南车株洲电力机车研究所有限公司 | Driver for special vehicle |
| CN107627862A (en) * | 2016-07-19 | 2018-01-26 | 株洲中车时代电气股份有限公司 | A kind of multithread convertor equipment |
| CN107834525A (en) * | 2017-11-17 | 2018-03-23 | 中车株洲电力机车有限公司 | A kind of protection system and method for track traffic multithread electric power system |
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| WO2021004267A1 (en) * | 2019-07-05 | 2021-01-14 | 中车资阳机车有限公司 | Topology structure of power battery pack of diesel-electric hybrid power locomotive |
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