CN112356856A - Method and system for inhibiting generation of higher harmonics after electric motor axle isolation - Google Patents
Method and system for inhibiting generation of higher harmonics after electric motor axle isolation Download PDFInfo
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- CN112356856A CN112356856A CN202011325503.8A CN202011325503A CN112356856A CN 112356856 A CN112356856 A CN 112356856A CN 202011325503 A CN202011325503 A CN 202011325503A CN 112356856 A CN112356856 A CN 112356856A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002955 isolation Methods 0.000 title claims description 59
- 230000002401 inhibitory effect Effects 0.000 title abstract description 10
- 230000003137 locomotive effect Effects 0.000 claims abstract description 38
- 238000004590 computer program Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000006870 function Effects 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C17/00—Arrangement or disposition of parts; Details or accessories not otherwise provided for; Use of control gear and control systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/02—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power with means for maintaining voltage within a predetermined range
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Transportation (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a method for inhibiting generation of higher harmonics after an electric locomotive axle is isolated, a control system and an electric locomotive. The invention effectively plans the higher harmonic generated during the operation of the cutting shaft by redistributing the phases of the residual shafts after the shaft is isolated, thereby effectively avoiding the adverse effect caused by the high network voltage under the power supply arm.
Description
Technical Field
The invention relates to the technical field of electric locomotive operation, in particular to a method and a system for inhibiting generation of higher harmonics after electric locomotive axle isolation.
Background
With the continuous development of electric locomotives, the reserves of the electric locomotives in China gradually increase, but at the same time, because of the particularity of the electric locomotives, particularly when the IGBT switching frequencies of different locomotives running in a mixed mode are different, higher harmonics with different degrees can be generated in the use process, and under the condition that the capacity of a contact net is limited, the higher harmonics of the electric locomotives cannot be absorbed more and more on the premise that a substation is not expanded due to the fact that the number of the electric locomotives under the same power supply arm is enlarged.
Electric locomotive is at present when the axle cutting application, through measuring, can lead to the increase of 1800Hz near higher harmonic, the stack of higher harmonic can lead to the net voltage that its power supply arm is down to uprise, can surpass the locomotive when serious and allow the protective value who receives the net voltage, make the locomotive break off main circuit breaker, thereby the inside components and parts of protection locomotive are not damaged, but simultaneously because main circuit breaker's disconnection, the locomotive can lose traction force, influence normal driving, can cause the locomotive night point when serious, influence the application order.
At present, a mode for inhibiting generation of higher harmonics caused by shaft isolation is to add a low-pass filter, and the filter is used for filtering redundant higher harmonics before a contact network voltage enters a converter. Specifically, the mode is mainly to filter higher harmonics, so that the converter filters the higher harmonics when detecting the network voltage, and therefore the situation that the locomotive is blocked by traction due to the high network voltage of the contact network is avoided.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a method, a control system and an electric locomotive for suppressing generation of higher harmonics after an electric locomotive axle is isolated, so as to solve the problems in the prior art.
On one hand, the embodiment of the invention discloses a method for inhibiting the generation of higher harmonics after the axle of an electric motor is isolated,
the rectifier phases for the remaining working axes are redistributed while any axis is isolated.
Further, the redistribution of the rectifier phases of the remaining working shafts is to distribute the phases evenly.
Further, comprising:
sending an axis isolation instruction;
and obtaining the number of the residual working shafts based on the shaft isolation instruction, and redistributing the rectifier phases of the residual working shafts to obtain the phase of each residual working shaft.
Further, the axis isolation instructions include any one of single axis isolation, dual axis isolation, and multi axis isolation.
On the other hand, the embodiment of the invention also discloses the electric locomotive, and the method for inhibiting the generation of higher harmonics after the axle of the electric locomotive is isolated is adopted.
In a third aspect, an embodiment of the present invention further discloses an electric motor axle isolation control system, which includes:
an instruction obtaining unit for obtaining an axis isolation instruction;
the judgment and analysis unit acquires the frontal axis isolation instruction based on the instruction acquisition unit, calculates the number of the residual working axes and obtains a rectifier phase redistribution scheme based on the number of the residual working axes;
a processing unit that controls phase redistribution of the rectifiers for the remaining working axes based on the rectifier phase redistribution scheme.
Further, the phase redistribution scheme is a rectifier phase average distribution to the remaining working shafts.
The embodiment of the invention also discloses a computer device, which comprises:
at least one processor; and
a memory storing a computer program executable on the processor, the processor executing the program to perform the method for suppressing generation of higher harmonics after electric power machine axle isolation.
A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the above-mentioned method of suppressing generation of higher harmonics after axle isolation of an electric machine.
By adopting the technical scheme, the invention at least has the following beneficial effects:
the invention effectively plans the higher harmonic generated during the operation of the cutting shaft by redistributing the phases of the residual shafts after the shaft is isolated, thereby effectively avoiding the adverse effect caused by the high network voltage under the power supply arm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a comparison of an embodiment disclosed herein.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
At present, the carrier phase of each axle of the locomotive is a fixed value, even if the axle isolation operation is carried out, the carrier phase after the axle isolation does not change, and the specific carrier phase is shown in table 1 at present.
TABLE 1
| CI1 | CI2 | CI3 | CI4 | CI5 | CI6 | |
| When there is no shaft isolation | 120° | 60° | 0° | 150° | 90° | 30° |
The invention uses the current carrier phase mode, and when any axis is isolated, the rectifier phases of the rest working axes are distributed and adjusted, thereby reducing the generation of higher harmonics. Specifically, some embodiments of the present invention disclose a method for suppressing generation of higher harmonics after an electric motor axle is isolated, and when any axle is isolated, rectifier phases of the remaining working axles are redistributed. Specifically, the redistribution of the rectifier phases of the remaining working shafts is to distribute the phases evenly.
In the method for inhibiting the generation of higher harmonics after the axle isolation of the electric motor disclosed by some embodiments of the invention, a control system sends an axle isolation instruction based on the axle isolation operation of an operation end; the instruction acquisition unit acquires the shaft isolation instruction and transmits the shaft isolation instruction to the judgment and analysis unit, the judgment and analysis unit obtains the number of the remaining working shafts based on the shaft isolation instruction, and the rectifier phases of the remaining working shafts are redistributed based on the number of the remaining working shafts to obtain the phase of each remaining working shaft. The axis isolation instruction includes any one of single axis isolation, double axis isolation, and multi axis isolation. The phase redistribution preferably takes the form of an even distribution. The phases of the rectifiers of the residual isolation states are distributed evenly, and the generation of higher harmonics of the rectifiers is restrained, so that the environment of a contact network is improved, the locomotive protection caused by high network voltage of the locomotive is reduced, and the abnormal operation condition of the locomotive is reduced.
The electric locomotive adopting the method for inhibiting the generation of the higher harmonics after the axle of the electric locomotive is isolated carries out average distribution adjustment on the rectifier phases of the rest working axles when any axle is isolated, thereby reducing the generation of the higher harmonics. The network voltage under the power supply arm is prevented from increasing, and the situation that the network voltage of the power supply arm exceeds the protection value of the locomotive which allows the network voltage to be received due to overhigh network voltage is avoided, so that the locomotive breaks a main circuit breaker to protect the internal components of the locomotive from being damaged. Further avoiding the problems of abnormal running, late driving and the like caused by the loss of traction of the locomotive.
The embodiment of the invention also discloses an electric locomotive axle isolation control system, which comprises:
an instruction obtaining unit for obtaining an axis isolation instruction;
the judgment and analysis unit acquires the frontal axis isolation instruction based on the instruction acquisition unit, calculates the number of the residual working axes and obtains a rectifier phase redistribution scheme based on the number of the residual working axes;
a processing unit that controls phase redistribution of the rectifiers for the remaining working axes based on the rectifier phase redistribution scheme.
Further, the phase redistribution scheme is a rectifier phase average distribution to the remaining working shafts.
The embodiment of the invention also discloses a computer device, which comprises:
at least one processor; and
a memory storing a computer program executable on the processor, the processor executing the program to perform the method for suppressing generation of higher harmonics after electric power machine axle isolation.
A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the above-mentioned method of suppressing generation of higher harmonics after axle isolation of an electric machine.
An embodiment of the invention discloses an electric locomotive, which adopts the method for inhibiting the generation of higher harmonics after the axle isolation of the electric locomotive, when the axle isolation operation does not occur, the carrier phase is as shown in the table 1, and the specific phase distribution condition after the phase angle is adjusted by phase-shifting carrier is shown in the table 2. When any axis is isolated, the rectifier phases of the remaining working axes are equally distributed and adjusted.
TABLE 2
| CI1 | CI2 | CI3 | CI4 | CI5 | CI6 | |
| CI1 isolation | - | O° | 36° | 72° | 108° | 144° |
| CI1,2 isolation | - | - | 0° | 45° | 90° | 135° |
| CI1,2,3 isolation | - | - | - | 0 | 60° | 120° |
| CI1,2,3,4 isolation | - | - | - | - | 0° | 90° |
| CI1,2,3,4,5 isolation | - | - | - | - | - | 30° |
After software is changed, through a software loading test, the higher harmonic waves of the locomotive at about 1800Hz are obviously reduced, and the specific ratio is shown in figure 1. When one-axis isolation to four-axis isolation occurs, 1800Hz harmonic current is increased when the carrier phase redistribution method is not adopted, and the 1800Hz harmonic current is reduced when the carrier phase redistribution method is adopted.
Finally, it should be noted that, as one of ordinary skill in the art can appreciate that all or part of the processes of the methods of the above embodiments can be implemented by a computer program to instruct related hardware, and the program of the method for reading an image file can be stored in a computer readable storage medium, and when executed, the program can include the processes of the embodiments of the methods as described above. The storage medium of the program may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like. The embodiments of the computer program may achieve the same or similar effects as any of the above-described method embodiments.
Furthermore, the methods disclosed according to embodiments of the present invention may also be implemented as a computer program executed by a processor, which may be stored in a computer-readable storage medium. Which when executed by a processor performs the above-described functions defined in the methods disclosed in embodiments of the invention.
Further, the above method steps and system elements may also be implemented using a controller and a computer readable storage medium for storing a computer program for causing the controller to implement the functions of the above steps or elements.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as software or hardware depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments of the present invention.
In one or more exemplary designs, the functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk, blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
It should be particularly noted that the various components or steps in the above embodiments can be mutually intersected, replaced, added or deleted, and therefore, the combination formed by the reasonable permutation and combination conversion shall also belong to the protection scope of the present invention, and the protection scope of the present invention shall not be limited to the embodiments.
The above is an exemplary embodiment of the present disclosure, and the order of disclosure of the above embodiment of the present disclosure is only for description and does not represent the merits of the embodiment. It should be noted that the discussion of any embodiment above is exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to those examples, and that various changes and modifications may be made without departing from the scope, as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (9)
1. A method for suppressing the generation of higher harmonics after the axle of electric motor is isolated,
the rectifier phases for the remaining working axes are redistributed while any axis is isolated.
2. The method for suppressing generation of higher harmonics after axle isolation of an electric machine according to claim 1, wherein said redistributing the rectifier phases of the remaining working axles is to equally distribute the phases.
3. The method for suppressing generation of higher harmonics after axle isolation of an electric motor according to claim 1, comprising:
sending an axis isolation instruction;
and obtaining the number of the residual working shafts based on the shaft isolation instruction, and redistributing the rectifier phases of the residual working shafts to obtain the phase of each residual working shaft.
4. The method for suppressing generation of higher harmonics after axle isolation of an electric motor according to claim 3, wherein the axle isolation command includes any one of single-axle isolation, double-axle isolation and multi-axle isolation.
5. An electric locomotive, characterized in that, the method for suppressing the generation of higher harmonics after the axle isolation of the electric locomotive according to any one of claims 1 to 4 is adopted.
6. An electric motor vehicle axle isolation control system, comprising:
an instruction obtaining unit for obtaining an axis isolation instruction;
the judgment and analysis unit acquires the frontal axis isolation instruction based on the instruction acquisition unit, calculates the number of the residual working axes and obtains a rectifier phase redistribution scheme based on the number of the residual working axes;
a processing unit that controls phase redistribution of the rectifiers for the remaining working axes based on the rectifier phase redistribution scheme.
7. The electric machine axle isolation control system of claim 6, wherein the phase redistribution scheme is rectifier phase averaging distribution to remaining working axles.
8. A computer device, comprising:
at least one processor; and
a memory storing a computer program operable on the processor, wherein the processor executes the program to perform the method of suppressing generation of higher harmonics after electric power locomotive axle isolation according to any one of claims 1 to 4.
9. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, performs the method for suppressing generation of higher harmonics after axle isolation of an electric motor according to any one of claims 1 to 4.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011325503.8A CN112356856A (en) | 2020-11-24 | 2020-11-24 | Method and system for inhibiting generation of higher harmonics after electric motor axle isolation |
| PCT/CN2021/123591 WO2022111099A1 (en) | 2020-11-24 | 2021-10-13 | Method for inhibiting generation of high-order harmonics after isolation of electric locomotive shaft, and system |
| ZA2021/08380A ZA202108380B (en) | 2020-11-24 | 2021-10-28 | Method and system for suppressing an electric locomotive from generating high-order harmonics after axle isolation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011325503.8A CN112356856A (en) | 2020-11-24 | 2020-11-24 | Method and system for inhibiting generation of higher harmonics after electric motor axle isolation |
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| Publication Number | Publication Date |
|---|---|
| CN112356856A true CN112356856A (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011325503.8A Pending CN112356856A (en) | 2020-11-24 | 2020-11-24 | Method and system for inhibiting generation of higher harmonics after electric motor axle isolation |
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| Country | Link |
|---|---|
| CN (1) | CN112356856A (en) |
| WO (1) | WO2022111099A1 (en) |
| ZA (1) | ZA202108380B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022111099A1 (en) * | 2020-11-24 | 2022-06-02 | 中车大连机车车辆有限公司 | Method for inhibiting generation of high-order harmonics after isolation of electric locomotive shaft, and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843044A (en) * | 2012-09-11 | 2012-12-26 | 北京铁道工程机电技术研究所有限公司 | Multi-axis misphase control device |
| CN104078991A (en) * | 2014-07-24 | 2014-10-01 | 东南大学 | Electric locomotive harmonic wave current segregated phase compensation method |
| CN108512436A (en) * | 2017-02-24 | 2018-09-07 | 株洲中车时代电气股份有限公司 | A kind of converter plant and accident isolating controlling method with automatism isolation function |
| US20190131869A1 (en) * | 2017-10-30 | 2019-05-02 | University Of Florida Research Foundation, Inc. | Spwm with dc offset based on total energy reduction |
| CN111756258A (en) * | 2020-06-07 | 2020-10-09 | 中车永济电机有限公司 | Control method of multiple four-quadrant pulse rectifier |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478565B (en) * | 2020-05-23 | 2021-10-26 | 西安科技大学 | Design method of higher harmonic suppression controller of VIENNA rectifier |
| CN112356856A (en) * | 2020-11-24 | 2021-02-12 | 中车大连机车车辆有限公司 | Method and system for inhibiting generation of higher harmonics after electric motor axle isolation |
-
2020
- 2020-11-24 CN CN202011325503.8A patent/CN112356856A/en active Pending
-
2021
- 2021-10-13 WO PCT/CN2021/123591 patent/WO2022111099A1/en active Application Filing
- 2021-10-28 ZA ZA2021/08380A patent/ZA202108380B/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843044A (en) * | 2012-09-11 | 2012-12-26 | 北京铁道工程机电技术研究所有限公司 | Multi-axis misphase control device |
| CN104078991A (en) * | 2014-07-24 | 2014-10-01 | 东南大学 | Electric locomotive harmonic wave current segregated phase compensation method |
| CN108512436A (en) * | 2017-02-24 | 2018-09-07 | 株洲中车时代电气股份有限公司 | A kind of converter plant and accident isolating controlling method with automatism isolation function |
| US20190131869A1 (en) * | 2017-10-30 | 2019-05-02 | University Of Florida Research Foundation, Inc. | Spwm with dc offset based on total energy reduction |
| CN111756258A (en) * | 2020-06-07 | 2020-10-09 | 中车永济电机有限公司 | Control method of multiple four-quadrant pulse rectifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022111099A1 (en) * | 2020-11-24 | 2022-06-02 | 中车大连机车车辆有限公司 | Method for inhibiting generation of high-order harmonics after isolation of electric locomotive shaft, and system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022111099A1 (en) | 2022-06-02 |
| ZA202108380B (en) | 2023-11-29 |
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Application publication date: 20210212 |