CN105720893A - Traction converter with secondary filter circuit - Google Patents
Traction converter with secondary filter circuit Download PDFInfo
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- CN105720893A CN105720893A CN201410722648.XA CN201410722648A CN105720893A CN 105720893 A CN105720893 A CN 105720893A CN 201410722648 A CN201410722648 A CN 201410722648A CN 105720893 A CN105720893 A CN 105720893A
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Classifications
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
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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
- H02P27/08—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 with pulse width modulation
Abstract
The invention provides a traction converter with a secondary filter circuit. The traction converter comprises a rectifier circuit, a secondary filter circuit and an inverter circuit, which are sequentially connected between the positive and negative ends of a bus. The rectifier circuit includes at least one four-quadrant rectifier connected in parallel. The secondary filter circuit, which is used for filtering out second harmonic, includes at least two filter capacitors connected in parallel, at least two filter inductors connected in parallel and at least one discharge resistor, wherein the at least one discharge resistor is connected in series and then connected in parallel to the two ends of the filter capacitors, and the filter inductors and the filter capacitors are connected in series. The inverter circuit includes at least one three-phase inverter connected in parallel, and each three-phase inverter is connected to at least one traction motor. By filtering out second harmonic in bus voltage, the voltage input to the inverters is accurate and reliable, and the traction motors can be driven safely and reliably.
Description
Technical field
The present invention relates to high speed motor car technical group field, particularly relate to a kind of traction convertor with secondary filtering circuit.
Background technology
EMU technology obtains development at full speed in recent years, and traction convertor is the important component part of EMU.Traction electric machine in traction convertor output three-phase alternating current electric drive EMU runs, thus driving the operation of EMUs.
Traction convertor is generally made up of commutator, inverter etc..Wherein, the alternating current of input is carried out rectification process by commutator, and inverter becomes alternating current for the unidirectional current after rectification being processed, to drive traction electric machine to run.But, still containing substantial amounts of second harmonic component in the voltage of rectifier rectification output, these second harmonic component can cause voltage waveform distortion, not only can other devices in current transformer be caused damage, also result in traction convertor and run appearance extremely, affect the operation of traction electric machine.Thus it is guaranteed that rectifier output voltage waveform stabilization, reduce harmonic wave as far as possible, most important for the reliability service of traction electric machine and the device safety of traction convertor.
Summary of the invention
For above-mentioned Problems existing, the present invention provides a kind of traction convertor with secondary filtering circuit, in order to realize the safe and reliable control to traction electric machine.
The invention provides a kind of traction convertor with secondary filtering circuit, including:
Rectification circuit, secondary filtering circuit and the inverter circuit being sequentially connected with；
Described rectification circuit includes at least one four-quadrant rectifier of parallel connection, and two outfans of each described four-quadrant rectifier are connected to anode and the negative terminal of bus；
Described secondary filtering is electrically connected between anode and the negative terminal of described bus, for filtering the second harmonic in busbar voltage；
Described secondary filtering circuit includes filter capacitor that at least two is connected in parallel, at least two is connected in parallel filter inductance and at least one discharge resistance, being connected in the two ends of described filter capacitor after at least one discharge resistance described series connection in parallel, described filter inductance is connected with described filter capacitor；
Described inverter circuit includes at least one three-phase inverter of parallel connection, two inputs of each described three-phase inverter are connected to anode and the negative terminal of described bus, and the three-phase output end of each described three-phase inverter is connected to the corresponding three-phase input end of at least one traction electric machine.
Traction convertor with secondary filtering circuit provided by the invention, including the rectification circuit being sequentially connected with, secondary filtering circuit and inverter circuit.Wherein, rectification circuit includes at least one four-quadrant rectifier of being connected in parallel；Secondary filtering circuit, for filtering the second harmonic in Output Voltage in Rectified Circuits so that the voltage accurate stable more of input inverter circuit；Inverter circuit includes the inverter of at least one parallel connection, for the unidirectional current inputting it is converted to alternating current to drive traction electric machine to run.By filtering the second harmonic in input voltage so that the voltage of input inverter accurately and reliably, advantageously ensures that the safe and reliable driving to traction electric machine.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the traction convertor embodiment one with secondary filtering circuit of the present invention；
Fig. 2 is the electrical block diagram of the traction convertor embodiment two with secondary filtering circuit of the present invention.
Detailed description of the invention
Fig. 1 is the electrical block diagram of traction convertor embodiment one of the present invention, as it is shown in figure 1, this traction convertor includes:
Rectification circuit 1, secondary filtering circuit 2 and the inverter circuit 3 being sequentially connected with；
Specifically, wherein, described rectification circuit 1 includes at least one four-quadrant rectifier of parallel connection, and two outfans of each described four-quadrant rectifier are connected to the anode VDC+ and negative terminal VDC-of bus.
In the present embodiment, for the quantity of four-quadrant rectifier for 2, two four-quadrant rectifiers are expressed as 11 and 12.First four-quadrant rectifier 11 and the second four-quadrant rectifier 12 are in parallel, and first the first outfan E1 and the second outfan F1 of four-quadrant rectifier 11 be connected to the anode VDC+ and negative terminal VDC-of bus, the first input end A3 and the second input B3 of the first four-quadrant rectifier 11 are used for receiving input voltage；The first outfan E2 and the second outfan F2 of the second four-quadrant rectifier 12 are connected to the anode VDC+ and negative terminal VDC-of bus, and the first input end A4 of the second four-quadrant rectifier 12 and the second input B4 is used for receiving another input voltage.Wherein, the input of the two four-quadrant rectifier is all frequency is the alternating current of 50Hz.
Specifically, described secondary filtering circuit 2 is connected between the anode VDC+ of described bus and negative terminal VDC-, for filtering the second harmonic in described rectification circuit 1 output voltage and busbar voltage；Described secondary filtering circuit 2 includes filter capacitor that at least two is connected in parallel, at least two is connected in parallel filter inductance and at least one discharge resistance, being connected in the two ends of described filter capacitor after at least one discharge resistance described series connection in parallel, described filter inductance is connected with described filter capacitor.Specifically, with the quantity of described filter capacitor for 3, the quantity of described filter inductance is 2, the quantity of described discharge resistance is 2 is example, 3 filter capacitors are expressed as C1, C2 and C3, and 2 filter inductances are expressed as L1 and L2, and 2 discharge resistances are expressed as R1 and R2.
Value after electric capacity C1, C2 and C3 parallel connection is decided to be C.Value after inductance L1, L2 parallel connection is decided to be L.Putting aside the impact of resistance, the resonance point of secondary filtering circuit designs near second harmonic, i.e. 100Hz, then resonant frequency:
Can be obtained by the value organizing L and C by above formula more.By considering that the factors such as cost and the volume of electric capacity and inductance can be obtained by the value of one group suitable electric capacity, inductance.
It addition, mainly discharged in filter capacitor two ends by discharge resistance R1 and R2.
In actual applications, the span of filter capacitor may is that C1=C2=C3=(1-3mF)；The span of inductance may is that L1=L2=(0.5-1.5mH)；The span of discharge resistance may is that R2=R3=(10-30k Ω).
In the present embodiment, this secondary filtering circuit adopts the connected mode of the many electric capacity of this use, inductance in parallel, more higher than the mode reliability of use single capacitor, single inductance.The electric current that the connected mode that main cause is in parallel passes through each element is less, improves the life-span of element.
Filtered the second harmonic of busbar voltage by this secondary filtering circuit, decreased wave distortion, improve the control performance of integrally dragging current transformer.Inductance in secondary filtering loop and electric capacity adopt the mode of multiple parallel connections, and discharge resistance adopts the mode of double; two resistant series, improves the life-span of device, also enhances the reliability of system.
Again specifically, described inverter circuit 3 includes at least one three-phase inverter of parallel connection, two inputs of each described three-phase inverter are connected to the anode VDC+ and negative terminal VDC-of described bus, and the three-phase output end of each described three-phase inverter is connected to the corresponding three-phase input end of at least one traction electric machine.The quantity of the three-phase inverter included for inverter circuit for 2, respectively the first three-phase inverter 31 and the second three-phase inverter 32.The first input end A5 and the second input B5 of described first three-phase inverter 31 are connected to the anode VDC+ and negative terminal VDC-of bus, and the three-phase output end of described first three-phase inverter connects at least one traction electric machine；The first input end A6 and the second input B6 of described second three-phase inverter 32 are connected to the anode VDC+ and negative terminal VDC-of bus, and the three-phase output end of described second three-phase inverter 32 connects at least one traction electric machine.
The traction convertor that the present embodiment provides, including the rectification circuit being sequentially connected with, secondary filtering circuit and inverter circuit.Wherein, rectification circuit includes at least one four-quadrant rectifier of being connected in parallel；Secondary filtering circuit, for filtering the second harmonic in Output Voltage in Rectified Circuits so that the voltage accurate stable more of input inverter circuit；Inverter circuit includes the inverter of at least one parallel connection, for the voltage inputting it is converted to alternating current to drive traction electric machine to run.By filtering the second harmonic in input voltage so that the voltage of input inverter accurately and reliably, advantageously ensures that the safe and reliable driving to traction electric machine.
Fig. 2 is the electrical block diagram of traction convertor embodiment two of the present invention, as shown in Figure 2, on the basis of embodiment illustrated in fig. 1, this traction convertor also includes: Support Capacitor 4, the output-parallel of described Support Capacitor 4 and described secondary filtering circuit 2, and it being connected between anode and the negative terminal of described bus, described Support Capacitor 4 is for removing the ripple in described output voltage.
Further, this traction convertor also includes: the first pre-charge circuit 51 and the second pre-charge circuit 52, for controlling the amplitude of variation of input current when described traction convertor initial power-on, makes the amplitude of variation of input current be unlikely to excessive, damages device.
The input A1 of described first pre-charge circuit 51 exports winding P1 with the secondary side of tractive transformer and is connected, the outfan B1 of described first the pre-charge circuit 52 and first input end A3 of the first four-quadrant rectifier 11 connects, and the second input B3 of described first four-quadrant rectifier 11 exports winding N1 with the secondary side of described tractive transformer and is connected；
The input A2 of described second pre-charge circuit 52 exports winding P2 with the secondary side of tractive transformer and is connected, the outfan B2 of described second the pre-charge circuit 52 and first input end A4 of the second four-quadrant rectifier 12 connects, and the second input of described second four-quadrant rectifier 12 exports winding N2 with the secondary side of tractive transformer described in B4 and is connected.
Specifically, described first pre-charge circuit 51 includes the first switch K1, second switch K2 and resistance R3, and described second pre-charge circuit 52 includes the 3rd switch K3；
Described first switch K1 and described resistance R3 is in parallel with described second switch K2 after connecting.
Time actually used, when traction convertor powers on, the first switch K1 Guan Bi in the first pre-charge circuit 51, second switch K2 disconnects, and the 3rd switch K3 of the second pre-charge circuit 52 disconnects.Electric current arrives the first four-quadrant rectifier 11 through resistance R3 so that the curent change amplitude (di/dt) when starting power up is unlikely to excessive, reduces the harm to each device.Switching K1 after 3-10ms to disconnect, K2, K3 close.The span of resistance R3 is 10 Ω-50 Ω.
Specifically, rectification circuit 1 in the present embodiment is made up of two four-quadrant rectifiers in parallel, as shown in Figure 2, first four-quadrant rectifier 11 and the second four-quadrant rectifier 12 are made up of 8 insulated gate bipolar transistors (IGBT) all respectively, namely the IGBT that the first four-quadrant rectifier 11 is characterized by S1-S8 forms, and the IGBT that the second four-quadrant rectifier 12 is characterized by S9-S16 forms.Specifically, the emitter stage of S1 and the colelctor electrode of S3 link together, and the emitter stage of S2 and the colelctor electrode of S4 link together, and the emitter stage of S5 and the colelctor electrode of S7 link together, and the emitter stage of S6 and the colelctor electrode of S8 link together.Wherein, the emitter stage of S1 and S2 links together, and is connected with the first four-quadrant rectifier 11 first input end A3；The emitter stage of S5 and S6 links together, and is connected with the first four-quadrant rectifier 11 second input B3；S1, S2, S5 and S6 colelctor electrode link together, and be connected with the first outfan E1 of the first four-quadrant rectifier 11；S3, S4, S7 and S8 emitter stage link together, and be connected with the second outfan F1 of the first four-quadrant rectifier 11.In like manner, similar annexation is also applied for the second four-quadrant rectifier 12, and concrete annexation as shown in Figure 2, repeats no more.
In the present embodiment, rectification circuit is made up of the four-quadrant rectifier of two cascades, by adopting pulsewidth modulation (Pulse-WidthModulation, hereinafter referred to as PWM) technology control to phase shifting angle, crest and the trough of the input current higher hamonic wave of two commutators just stagger, and enable the higher hamonic wave of electric current to cancel out each other a part.Specifically, in electric traction alternating-current transmission system, owing to the switching frequency of powerful switching device is relatively low, in order to improve power system capacity and reduce the harmonic content of net side input current, generally commutator is adopted multiple technology.The present embodiment specifically adopts the pulse rectifier of doubleization, i.e. two four-quadrant rectifiers, the triangular carrier phase place of two commutators is staggered mutually the phase angle of a pi/2, then the staircase waveform that the waveform generating mode in PWM technology and the phase shift superposition in phase-shifting carrier wave technology obtain is utilized, thus the crest of the input current higher hamonic wave of two commutators and trough just stagger, fractional harmonic in the harmonic content of transformator primary side current is made to cancel out each other.
Again specifically, in the traction convertor of the present embodiment, inverter circuit 3 is made up of two three-phase inverters in parallel, as shown in Figure 2, first three-phase inverter 31 and the second three-phase inverter 32 are made up of 6 IGBT respectively, namely the first three-phase inverter 31 is made up of S17-S22, and the second three-phase inverter 32 is made up of S23-S28.Wherein, for the first three-phase inverter 31, the emitter stage of S17 and the colelctor electrode of S20 link together, the emitter stage of S18 and the colelctor electrode of S21 link together, the emitter stage of S19 and the colelctor electrode of S22 link together, S17, S18 and S19 colelctor electrode link together, and be connected with the first input end A5 of the first three-phase inverter 31, S20, S21 and S22 emitter stage link together, and be connected with the second input B5 of the first three-phase inverter 31.S17, S18 and S19 the three-phase output end of emitter stage respectively the first three-phase inverter 31, be respectively connecting to the corresponding three-phase input end of a few traction electric machine.
Accordingly, for the second three-phase inverter 32, the emitter stage of S23 and the colelctor electrode of S26 link together, the emitter stage of S24 and the colelctor electrode of S27 link together, the emitter stage of S25 and the colelctor electrode of S28 link together, S23, S24 and S25 colelctor electrode link together, and be connected with the first input end A6 of the second three-phase inverter 32, S26, S27 and S28 emitter stage link together, and be connected with the second input B6 of the second three-phase inverter 32.S23, S24 and S25 the three-phase output end of emitter stage respectively the second three-phase inverter 32, be respectively connecting to the corresponding three-phase input end of a few traction electric machine.
In the present embodiment, this traction convertor main circuit includes the pre-charge circuit, rectification circuit, secondary filtering circuit, Support Capacitor and the inverter circuit that are sequentially connected with.Wherein, pre-charge circuit for controlling the amplitude of variation of input current when traction convertor initial power-on so that the amplitude of variation of the electric current of input rectification circuit is unlikely to excessive, advantageously reduces the damage to each device of current transformer；Rectification circuit includes two four-quadrant rectifiers being connected in parallel, by adopting the pulse modulation technology control to phase shifting angle, crest and the trough of the input current higher hamonic wave of two commutators just stagger, and make fractional harmonic in the harmonic content of transformator primary side current cancel out each other；Busbar voltage processes circuit and includes secondary filtering circuit and Support Capacitor, is used for the second harmonic and the ripple that filter in voltage so that the voltage accurate stable more of input inverter circuit；Inverter circuit includes two inverters in parallel, for the unidirectional current inputting it is converted to alternating current to drive traction electric machine to run.By controlling the amplitude of variation of input current, the higher hamonic wave filtered in input current, filtering intermediate-bus voltage second harmonic, ripple so that the voltage of input inverter accurately and reliably, advantageously ensures that the safe and reliable driving to traction electric machine.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (6)
1. the traction convertor with secondary filtering circuit, it is characterised in that including:
Rectification circuit, secondary filtering circuit and the inverter circuit being sequentially connected with；
Described rectification circuit includes at least one four-quadrant rectifier of parallel connection, and two outfans of each described four-quadrant rectifier are connected to anode and the negative terminal of bus；
Described secondary filtering is electrically connected between anode and the negative terminal of described bus, for filtering the second harmonic in described busbar voltage；
Described secondary filtering circuit includes filter capacitor that at least two is connected in parallel, at least two is connected in parallel filter inductance and at least one discharge resistance, being connected in the two ends of described filter capacitor after at least one discharge resistance described series connection in parallel, described filter inductance is connected with described filter capacitor；
Described inverter circuit includes at least one three-phase inverter of parallel connection, two inputs of each described three-phase inverter are connected to anode and the negative terminal of described bus, and the three-phase output end of each described three-phase inverter is connected to the corresponding three-phase input end of at least one traction electric machine.
2. traction convertor according to claim 1, it is characterized in that, also include: Support Capacitor, the output-parallel of described Support Capacitor and described secondary filtering circuit, and it being connected between anode and the negative terminal of described bus, described Support Capacitor is for removing the ripple in described busbar voltage.
3. traction convertor according to claim 1, it is characterised in that the quantity of described filter capacitor is 3, the quantity of described filter inductance is 2, and the quantity of described discharge resistance is 2.
4. traction convertor according to claim 1, it is characterised in that the quantity of described four-quadrant rectifier is 2, the quantity of described three-phase inverter is 2.
5. traction convertor according to claim 4, it is characterised in that also include: the first pre-charge circuit and the second pre-charge circuit, for controlling the amplitude of variation of input current when described traction convertor initial power-on；
The input of described first pre-charge circuit exports winding P1 with the secondary side of tractive transformer and is connected, the outfan of described first pre-charge circuit and the first input end of the first four-quadrant rectifier connect, and the second input of described first four-quadrant rectifier exports winding N1 with the secondary side of described tractive transformer and is connected；
The input of described second pre-charge circuit exports winding P2 with the secondary side of tractive transformer and is connected, the outfan of described second pre-charge circuit and the first input end of the second four-quadrant rectifier connect, and the second input of described second four-quadrant rectifier exports winding N2 with the secondary side of described tractive transformer and is connected.
6. traction convertor according to claim 5, it is characterised in that described first pre-charge circuit includes the first switch, second switch and resistance, and described second pre-charge circuit includes the 3rd switch；
Described first switchs and in parallel with described second switch after described resistant series.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410722648.XA CN105720893A (en) | 2014-12-02 | 2014-12-02 | Traction converter with secondary filter circuit |
| PCT/CN2014/094047 WO2016086457A1 (en) | 2014-12-02 | 2014-12-17 | Traction converter having secondary filtering circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410722648.XA CN105720893A (en) | 2014-12-02 | 2014-12-02 | Traction converter with secondary filter circuit |
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| CN105720893A true CN105720893A (en) | 2016-06-29 |
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| CN201410722648.XA Pending CN105720893A (en) | 2014-12-02 | 2014-12-02 | Traction converter with secondary filter circuit |
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| WO (1) | WO2016086457A1 (en) |
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| CN107786082A (en) * | 2016-08-24 | 2018-03-09 | 汪凤喜 | Voltage regulation filtering device for vehicle voltage |
| CN108631571A (en) * | 2018-05-25 | 2018-10-09 | 中车青岛四方车辆研究所有限公司 | The preliminary filling electrical circuit and control method of traction convertor |
| CN111130329A (en) * | 2018-10-31 | 2020-05-08 | 中车永济电机有限公司 | Intermediate direct current circuit of traction converter and traction converter |
| WO2020093465A1 (en) * | 2018-11-08 | 2020-05-14 | 中车永济电机有限公司 | High-power direct-drive permanent magnet electric transmission system for electric locomotive |
| CN111245208A (en) * | 2018-11-29 | 2020-06-05 | 中车永济电机有限公司 | Traction transformer, traction system and filtering regulation circuit control method of electric locomotive |
| CN112713785A (en) * | 2020-12-22 | 2021-04-27 | 中车永济电机有限公司 | Novel converter main circuit |
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|---|---|---|---|---|
| CN107786082A (en) * | 2016-08-24 | 2018-03-09 | 汪凤喜 | Voltage regulation filtering device for vehicle voltage |
| CN108631571A (en) * | 2018-05-25 | 2018-10-09 | 中车青岛四方车辆研究所有限公司 | The preliminary filling electrical circuit and control method of traction convertor |
| CN111130329A (en) * | 2018-10-31 | 2020-05-08 | 中车永济电机有限公司 | Intermediate direct current circuit of traction converter and traction converter |
| WO2020093465A1 (en) * | 2018-11-08 | 2020-05-14 | 中车永济电机有限公司 | High-power direct-drive permanent magnet electric transmission system for electric locomotive |
| CN111245208A (en) * | 2018-11-29 | 2020-06-05 | 中车永济电机有限公司 | Traction transformer, traction system and filtering regulation circuit control method of electric locomotive |
| CN112713785A (en) * | 2020-12-22 | 2021-04-27 | 中车永济电机有限公司 | Novel converter main circuit |
Also Published As
| Publication number | Publication date |
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| WO2016086457A1 (en) | 2016-06-09 |
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