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CN112886829A - Traction drive system - Google Patents

Traction drive system Download PDF

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Publication number
CN112886829A
CN112886829A CN202110079836.5A CN202110079836A CN112886829A CN 112886829 A CN112886829 A CN 112886829A CN 202110079836 A CN202110079836 A CN 202110079836A CN 112886829 A CN112886829 A CN 112886829A
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CN
China
Prior art keywords
module
igbt tube
sub
bridge
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110079836.5A
Other languages
Chinese (zh)
Inventor
张巍
王泽�
谌骅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Southern University of Science and Technology
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Southern University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Southern University of Science and Technology filed Critical Southern University of Science and Technology
Priority to CN202110079836.5A priority Critical patent/CN112886829A/en
Publication of CN112886829A publication Critical patent/CN112886829A/en
Pending legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
    • B60L9/24—Electric propulsion with power supply external to the vehicle using ac induction motors fed from ac supply lines
    • B60L9/28—Electric propulsion with power supply external to the vehicle using ac induction motors fed from ac supply lines polyphase motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a traction transmission system. The traction drive system includes: the power supply module is used for providing a power supply signal; one end of the switch module is connected with the power supply module and is used for controlling the power supply state of the power supply module; the rectification module is connected with the other end of the switch module and is used for rectifying the power supply signal; the inversion module is connected with the rectification module and is used for performing inversion operation on the rectified power supply signal; and the motor is connected with the inverter module. The embodiment of the invention can realize the normal operation of the electric locomotive through a set of traction transmission system, improve the operation efficiency of the electric locomotive and reduce the cost of the electric locomotive.

Description

Traction drive system
Technical Field
The invention relates to the field of traction, in particular to a traction transmission system.
Background
The high-power AC traction transmission system is the main transmission mode of the existing freight locomotive.
In the related art, a traction drive system mostly adopts a converter with a two-level topology structure. However, the output power of a single set of converter is limited, and in order to improve the power of the whole vehicle, a plurality of sets of traction converters are required to be adopted to operate in a matched mode, so that the cost of a traction transmission system is improved. In addition, the traction converter is limited by the withstand voltage of the industrial IGBT, and the voltage amplitude output by the two-level traction converter is limited, so that the voltage class of the traction motor is limited within the range of 1-2 KV, and the efficiency of the whole vehicle connected with the converter is limited.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a traction transmission system which can improve the overall efficiency of an electric locomotive.
A traction drive system according to an embodiment of the first aspect of the invention comprises: the power supply module is used for providing a power supply signal; one end of the switch module is connected with the power supply module and is used for controlling the power supply state of the power supply module; the rectification module is connected with the other end of the switch module and is used for rectifying the power supply signal; the inversion module is connected with the rectification module and is used for performing inversion operation on the rectified power supply signal; and the motor is connected with the inverter module.
The traction transmission system provided by the embodiment of the invention has at least the following beneficial effects: through the single-phase pulsating secondary reactive power provided by the rectifier module, the rectifier module and the inverter module do not need to carry out a secondary resonance link, and the capacitor pulsation of the inverter module is ensured within a reasonable range. The electric locomotive can realize normal operation only by using the set of traction transmission system, thereby improving the efficiency of the whole locomotive and reducing the production cost of the whole locomotive.
According to some embodiments of the invention, further comprising: and the auxiliary power supply module is connected with the other end of the switch module and is used for providing an auxiliary electric signal for the electric locomotive.
According to some embodiments of the invention, the rectifier module comprises: the first submodule comprises at least two first half-bridge units and at least two first full-bridge units, and the at least two first half-bridge units are connected with the at least two first full-bridge units at intervals; the second submodule is connected with the first submodule and comprises at least two second half-bridge units and at least two second full-bridge units, and the at least two second half-bridge units are connected with the at least two second full-bridge units at intervals; the first coupling inductor is connected with the first sub-module; and the second coupling inductor is connected with the second submodule.
According to some embodiments of the invention, the inverter module comprises: the first through module is connected with one end of the second sub module and used for reducing harmonic components of the traction transmission system; the third sub-module comprises at least three third half-bridge units, and the at least three third half-bridge units are correspondingly connected with the first through module; a fourth sub-module comprising at least three fourth half-bridge cells; one end of the third coupling inductor is connected with the third sub-module, and the other end of the third coupling inductor is connected with the fourth sub-module; and the second through module is correspondingly connected with at least three fourth half-bridge units and is connected with the other end of the second sub-module.
According to some embodiments of the invention, the first through module comprises: the first switch unit, the second switch unit and the third switch unit are respectively and correspondingly connected with the three third half-bridge units; the second pass-through module includes: the fourth switch unit, the fifth switch unit and the sixth switch unit are respectively and correspondingly connected with the three fourth half-bridge units.
According to some embodiments of the invention, the first through module further comprises: a first capacitor connected to the third switching unit; the first switching unit includes: the collector of the first IGBT tube is connected with the second sub-module, the emitter of the first IGBT tube is respectively connected with the collector of the second IGBT tube and the corresponding third half-bridge unit, and the emitter of the second IGBT tube is connected with the second switch unit; the second switching unit includes: a collector of the third IGBT tube is connected with the second sub-module, an emitter of the third IGBT tube is respectively connected with a collector of the fourth IGBT tube and the corresponding third half-bridge unit, and an emitter of the fourth IGBT tube is connected with the third switch unit; the third switching unit includes: the collector electrode of the fifth IGBT tube is connected with the second sub-module, the emitter electrode of the fifth IGBT tube is respectively connected with the collector electrode of the sixth IGBT tube and the corresponding third half-bridge unit, and the emitter electrode of the sixth IGBT tube is connected with the first capacitor.
According to some embodiments of the invention, the second pass-through module further comprises: a second capacitor connected to the sixth switching unit; the fourth switching unit includes: a collector of the seventh IGBT tube is connected with the second capacitor, an emitter of the seventh IGBT tube is respectively connected with a collector of the eighth IGBT tube and a corresponding fourth half-bridge unit, and an emitter of the eighth IGBT tube is connected with the second capacitor; the fifth switching unit includes: a ninth IGBT tube and a tenth IGBT tube, wherein a collector of the ninth IGBT tube is connected with the second capacitor, an emitter of the ninth IGBT tube is respectively connected with a collector of the tenth IGBT tube and a corresponding fourth half-bridge unit, and an emitter of the tenth IGBT tube is connected with the second capacitor; the sixth switching unit includes: the collector of the eleventh IGBT tube is connected with the second capacitor, the emitter of the eleventh IGBT tube is respectively connected with the collector of the twelfth IGBT tube and the corresponding fourth half-bridge unit, and the emitter of the twelfth IGBT tube is connected with the second capacitor.
According to some embodiments of the invention, the first, second, third and fourth half-bridge cells each comprise: a third capacitor; a thirteenth IGBT tube, wherein the collector electrode of the thirteenth IGBT tube is connected with the third capacitor; and a collector of the fourteenth IGBT tube is connected with an emitter of the thirteenth IGBT tube, and an emitter of the fourteenth IGBT tube is connected with the third capacitor.
According to some embodiments of the invention, the first full-bridge cell and the second full-bridge cell each comprise: a fourth capacitor; a fifteenth IGBT tube, wherein the collector of the fifteenth IGBT tube is connected with the fourth capacitor; a sixteenth IGBT tube, wherein a collector of the sixteenth IGBT tube is connected with an emitter of the fifteenth IGBT tube, and an emitter of the sixteenth IGBT tube is connected with the fourth capacitor; a seventeenth IGBT tube, wherein a collector electrode of the seventeenth IGBT tube is connected with a collector electrode of the fifteenth IGBT tube; and the collector of the eighteenth IGBT tube is connected with the emitter of the seventeenth IGBT tube, and the emitter of the eighteenth IGBT tube is connected with the emitter of the sixteenth IGBT tube.
According to some embodiments of the invention, the auxiliary power module comprises: a transformer, a primary coil of which is connected with the switch module; a first converter connected to a secondary coil of the transformer; a fifth capacitor connected to the first converter; and the second converter is connected with the fifth capacitor.
According to some embodiments of the invention, a switch module comprises: one end of the first sub-switch is connected with the power supply module, and the other end of the first sub-switch is connected with the rectification module; one end of the first resistor is connected with the power supply module and one end of the first sub-switch respectively; and one end of the second sub-switch is connected with the other end of the first resistor, and the other end of the second sub-switch is connected with the other end of the first sub-switch.
According to some embodiments of the invention, the power supply module comprises: a hauling net; and one end of the pantograph is connected with the traction net, and the other end of the pantograph is respectively connected with one end of the first sub-switch and one end of the first resistor.
According to some embodiments of the invention, further comprising: at least one third sub-switch, one end of which is connected with the second sub-module; and one end of the second resistor is connected with the other end of the third sub-switch, and the other end of the second resistor is connected with the second sub-module.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a block diagram of a traction drive system according to an embodiment of the present invention;
FIG. 2 is another block diagram of a traction drive system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an electrical circuit configuration of the traction drive system according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a half-bridge unit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a full-bridge cell according to an embodiment of the invention.
Reference numerals:
the power supply system comprises a power supply module 100, a switch module 200, a rectification module 300, a first sub-module 310, a second sub-module 320, an inversion module 400, a first through module 410, a third sub-module 420, a fourth sub-module 430, a second through module 440, a motor 500, an auxiliary power supply module 600, a first converter 610 and a second converter 620.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Referring to FIG. 1, an embodiment of the present application provides a traction drive system. The traction drive system includes: the power supply module 100, the switching module 200, the rectifying module 300, the inverting module 400, and the motor 500. The power supply module 100 is used for providing a power supply signal; one end of the switch module 200 is connected to the power supply module 100, and the switch module 200 is used for controlling the power supply state of the power supply module 100; the rectifying module 300 is connected with the other end of the switch module 200, and the rectifying module 300 is used for rectifying the power supply signal; the inversion module 400 is connected with the rectification module 300, and the inversion module 400 is used for performing inversion operation on the rectified power supply signal; the motor 500 is connected to the inverter module 400. Specifically, the traction drive system provided by the embodiment of the present application is applied to an electric locomotive, and the motor 500 is used for controlling the movement of the electric locomotive. The switch module 200 is controlled by an external main control module, and when the main control module controls the switch module 200 to be turned on, the power supply module 100 provides a power supply signal for the subsequent circuit. The rectification module 300 and the inversion module 400 are composed of MMC (modular multilevel converter), and the front-end single-phase MMC four-quadrant converter (rectification module 300) of the traction transmission system connects the switch module 200 and the power supply module 100 and controls the dc bus; the rear-stage inverter-side MMC (inverter module 400) drives the traction motor 500. When the motor 500 actually operates, the direct-current voltage is adjusted by controlling the rectifying module 300, and the quality of the grid-connected current waveform is ensured; controlling the operation speed of the motor 500 by controlling the inverter module 400; the electric locomotive can normally operate under traction, braking and various complex conditions by coordinating the rectification module 300 and the inversion module 400.
The traction transmission system provided by the embodiment of the application has the advantages that the rectification module 300 and the inversion module 400 do not need to carry out a secondary resonance link through the single-phase pulsating secondary reactive power provided by the rectification module 300, and the capacitor pulsation of the inversion module 400 is ensured within a reasonable range. The electric locomotive can realize normal operation only by using the set of traction transmission system, thereby improving the efficiency of the whole locomotive and reducing the production cost of the whole locomotive.
Referring to fig. 2, in some embodiments, the traction drive system further comprises: and the auxiliary power supply module 600 is connected with the other end of the switch module 200 and is used for providing an auxiliary electric signal for the electric locomotive. Specifically, the auxiliary power supply module 600 is connected to the switch module 200, and when the switch module 200 is turned on, the auxiliary power supply module 600 takes power from the ac side of the traction drive system, so as to provide an auxiliary electrical signal to a load such as a car of the electric locomotive according to the ac power. The auxiliary power supply module 600 is a separately designed low-power and small-size power frequency transformer, and power does not need to be taken from an auxiliary winding of the existing power frequency transformer, so that the controllability of the auxiliary power supply module 600 is improved.
Referring to fig. 3, in some embodiments, a rectifier module 300 includes: a first submodule 310, a second submodule 320, a first coupling inductance L1 and a second coupling inductance L2. The first submodule 310 includes at least two first half-bridge cells (HB1) and at least two first full-bridge cells (FB1), and the at least two first half-bridge cells are connected with the at least two first full-bridge cells at intervals. The second submodule 320 is connected to the first submodule 310, and the second submodule 320 includes at least two second half-bridge cells (HB2) and at least two full-bridge cells (FB2), and the at least two second half-bridge cells are connected to the at least two second full-bridge cells at intervals. The first coupling inductor L1 is connected to the first submodule 310, and the second coupling inductor L2 is connected to the second submodule 320.
In particular, the first sub-module 310 comprises at least two first half-bridge cells and two first full-bridge cells, for example: the first sub-module 310 includes a first sub-half-bridge cell, a second sub-half-bridge cell, a first sub-full-bridge cell, and a second sub-full-bridge cell. First sub-half-bridge unit, second sub-half-bridge unit, first sub-full-bridge unit and second sub-full-bridge unit interval connection, first sub-full-bridge unit, first sub-half-bridge unit, second sub-half-bridge unit, the order of second sub-full-bridge unit are connected promptly for first sub-module 310, wherein, first sub-module 310's top and bottom set up a first full-bridge unit respectively, and the mid portion is set up by first full-bridge unit and first half-bridge unit interval. The first coupling inductor L1 is a series single-port network, that is, the switch module 200 is connected to a connection point between the primary winding and the secondary winding of the first coupling inductor L1 through the inductor L0, the primary winding of the first coupling inductor L1 is connected to the first sub-half-bridge unit, and the secondary winding of the first coupling inductor L1 is connected to the second sub-half-bridge unit. The second sub-module 320 comprises at least two second half-bridge cells and two second full-bridge cells, for example: the second sub-module 320 includes a third sub-half-bridge cell, a fourth sub-half-bridge cell, a third sub-full-bridge cell, and a fourth sub-full-bridge cell. The third sub-half bridge unit, the fourth sub-half bridge unit, the third sub-full bridge unit and the fourth sub-full bridge unit are connected at intervals, that is, the second sub-module 320 is connected according to the sequence of the third sub-full bridge unit, the fourth sub-half bridge unit, the third sub-half bridge unit and the fourth sub-full bridge unit, wherein the top and the bottom of the second sub-module 320 are respectively provided with the second full bridge unit, and the middle part is arranged at intervals by the second full bridge unit and the second half bridge unit. The rectifier module 300 reduces the cost of the circuit by a combination of a full bridge and a half bridge. The second coupling inductor L2 is a series single-port network, i.e. the ground terminal is connected to the connection point between the primary coil and the secondary coil of the second coupling inductor L2, the primary coil of the second coupling inductor L2 is connected to the third sub-half-bridge unit, and the secondary coil of the second coupling inductor is connected to the fourth sub-half-bridge unit. By connecting the first coupling inductor L1 with the first sub-module 310 and connecting the second coupling inductor L2 with the second sub-module 320, the harmonic component of the output signal of the traction drive system is reduced, thereby reducing the loss of the motor 500. It is understood that the number of the first half-bridge unit and the first full-bridge unit included in the first sub-module 310, and the number of the second half-bridge unit and the second full-bridge unit included in the second sub-module 320 may be adaptively adjusted according to actual needs, and the embodiment of the present invention is not particularly limited.
In some embodiments, the inverter module 400 includes: a first pass-through module 410, a third sub-module 420, a fourth sub-module 430, a third coupling inductor, and a second pass-through module 440. The first pass-through module 410 is connected to one end of the second sub-module 320 for reducing harmonic components of the traction drive system. The third submodule 420 includes at least three third half-bridge cells (HB3) connected to the first through module 410. The fourth submodule 430 comprises at least three fourth half-bridge cells (HB 4). One end of the third coupling inductor is connected to the third sub-module 420, and the other end of the third coupling inductor is connected to the fourth sub-module 430. The second through module 440 is correspondingly connected to at least three fourth half-bridge units and is connected to the other end of the second sub-module 320.
In some specific embodiments, the first pass-through module 410 includes: the first, second, and third switching units, and the second pass-through module 440 includes: a fourth switching unit, a fifth switching unit, and a sixth switching unit. The three third half-bridge units are respectively and correspondingly connected with the first switch unit, the second switch unit and the third switch unit, and the three fourth half-bridge units are respectively and correspondingly connected with the fourth switch unit, the fifth switch unit and the sixth switch unit. The third coupling inductor comprises a first sub-coupling inductor L3, a second sub-coupling inductor L4 and a third sub-coupling inductor L5, and the first sub-coupling inductor L3, the second sub-coupling inductor L4 and the third sub-coupling inductor L5 are correspondingly connected with the third half-bridge unit and the fourth half-bridge unit. For example: one end of the first sub-coupling inductor L3 is connected to the corresponding third half-bridge unit, and the other end of the first sub-coupling inductor L3 is connected to the corresponding fourth half-bridge unit. The third coupling inductor is a forward-connected series single-port network, that is, a primary coil of the third coupling inductor is connected to the third half-bridge unit, a secondary coil of the third coupling inductor is connected to the fourth half-bridge unit, and a connection point of the primary coil and the secondary coil of the first sub-coupling inductor L3, a connection point of the primary coil and the secondary coil of the second sub-coupling inductor L4, and a connection point of the primary coil and the secondary coil of the third sub-coupling inductor L5 are electrically connected to the three phases of the motor 500, respectively. The first through module 410 and the second through module 440 are respectively disposed at the top end and the bottom end of the inverter module 400, and on the premise of not changing the essence of the MMC topology structure, only the units at the top end and the bottom end of each phase are operated when compensating the stator voltage of the motor 500, and the rest of the units are bypassed, thereby solving the problem that the motor 500 is difficult to start under the condition of extremely low frequency (< 5%).
In some embodiments, the first through module 410 further comprises: the first capacitor C1 and the first capacitor C1 are connected to the third switch unit. The first switching unit includes a first IGBT tube Q1 and a second IGBT tube Q2, the second switching unit includes a third IGBT tube Q3 and a fourth IGBT tube Q4, and the third switching unit includes a fifth IGBT tube Q5 and a sixth IGBT tube Q6. The collector of the first IGBT tube Q1 is connected to the second submodule 320, the emitter of the first IGBT tube Q1 is connected to the collector of the second IGBT tube Q2 and the corresponding third half-bridge unit, and the emitter of the second IGBT tube Q2 is connected to the second switching unit. The collector of the third IGBT tube Q3 is connected to the second submodule 320, the emitter of the third IGBT tube Q3 is connected to the collector of the fourth IGBT tube Q4 and the corresponding third half-bridge unit, and the emitter of the fourth IGBT tube Q4 is connected to the third switching unit. The collector of the fifth IGBT tube Q5 is connected to the second sub-module 320, the emitter of the fifth IGBT tube Q5 is connected to the collector of the sixth IGBT tube Q6 and the corresponding third half-bridge unit, and the emitter of the sixth IGBT tube Q6 is connected to the first capacitor C1. Specifically, the running state of the motor 500 is controlled by respectively controlling the on and off of a first IGBT tube Q1, a second IGBT tube Q2, a third IGBT tube Q3, a fourth IGBT tube Q4, a fifth IGBT tube Q5 and a sixth IGBT tube Q6.
In some embodiments, the second pass-through module 440 further comprises: and a second capacitor C2 connected to the sixth switching unit. The fourth switching unit comprises a seventh IGBT tube Q7 and an eighth IGBT tube Q8, the fifth switching unit comprises a ninth IGBT tube Q9 and a tenth IGBT tube Q10, and the sixth switching unit comprises an eleventh IGBT tube Q11 and a twelfth IGBT tube Q12. The collector of the seventh IGBT Q7 is connected to the second capacitor, the emitter of the seventh IGBT Q7 is connected to the collector of the eighth IGBT Q8 and the corresponding fourth half-bridge unit, and the emitter of the eighth IGBT Q8 is connected to the second capacitor. The collector of the ninth IGBT Q9 is connected to the second capacitor, the emitter of the ninth IGBT Q9 is connected to the collector of the tenth IGBT Q10 and the corresponding fourth half-bridge unit, and the emitter of the tenth IGBT Q10 is connected to the second capacitor. The collector of the eleventh IGBT Q11 is connected to the second capacitor, the emitter of the eleventh IGBT Q11 is connected to the collector of the twelfth IGBT Q12 and the corresponding fourth half-bridge unit, and the emitter of the twelfth IGBT Q12 is connected to the second capacitor. Specifically, the operating state of the motor 500 is controlled by respectively controlling the on/off of the seventh IGBT tube Q7, the eighth IGBT tube Q8, the ninth IGBT tube Q9, the tenth IGBT tube Q10, the eleventh IGBT tube Q11, and the twelfth IGBT tube Q12.
Referring to fig. 4, in some embodiments, the first half-bridge unit, the second half-bridge unit, the third half-bridge unit, and the fourth half-bridge unit respectively include: third capacitor C3, thirteenth IGBT Q13 and fourteenth IGBT Q14, wherein the collector of thirteenth IGBT Q13 is connected to third capacitor C3, the collector of fourteenth IGBT Q14 is connected to the emitter of thirteenth IGBT Q13, and the emitter of fourteenth IGBT Q14 is connected to third capacitor C3. Specifically, the specific connection structures of the first half-bridge unit, the second half-bridge unit, the third half-bridge unit and the fourth half-bridge unit are the same.
In some embodiments, the first full-bridge cell and the second full-bridge cell each comprise: a fourth capacitor C4, a fifteenth IGBT Q15, a sixteenth IGBT Q16, a seventeenth IGBT Q17, and an eighteenth IGBT Q18. The collector of the fifteenth IGBT Q15 is connected to the fourth capacitor C4. The collector of the sixteenth IGBT Q16 is connected to the emitter of the fifteenth IGBT Q15, and the emitter of the sixteenth IGBT Q16 is connected to the fourth capacitor C4. The collector of the seventeenth IGBT Q17 is connected to the collector of the fifteenth IGBT Q15. The collector of the eighteenth IGBT Q18 is connected to the emitter of the seventeenth IGBT Q17, and the emitter of the eighteenth IGBT Q18 is connected to the emitter of the sixteenth IGBT Q16. Specifically, the specific connection structure of the first full-bridge cell and the second full-bridge cell is the same.
Referring again to fig. 3, in some embodiments, the auxiliary power module 600 includes: a transformer, a first converter 610, a fifth capacitor C5 and a second converter 620. The connection of the primary winding of the transformer to the switching module 200; the first converter 610 is connected to the secondary winding of the transformer; the fifth capacitor C5 is connected to the first converter 610; the second converter 620 is connected to a fifth capacitor C5. Specifically, the fifth capacitor C5 is a support capacitor, the second converter 620 is connected to a load such as a car of the electric locomotive, and the transformer takes power from the ac side of the switch module 200 through the primary coil, thereby providing an auxiliary electric signal to the load such as the car of the electric locomotive according to the ac power. The auxiliary power supply module 600 is a separately designed low-power and small-size power frequency transformer, and power does not need to be taken from an auxiliary winding of the existing power frequency transformer, so that the controllability of the auxiliary power supply module 600 is improved. It is understood that the auxiliary power module 600 may also use a wide boost range Z source, a quasi-Z source converter, or other boost inverter circuit.
In some embodiments, the switch module 200 includes: a first sub-switch K1, a first resistor R1 and a second sub-switch K2. One end of the first sub-switch K1 is connected to the power supply module 100, and the other end of the first sub-switch K1 is connected to the rectifying module 300. One end of the first resistor R1 is connected to the power supply module 100 and one end of the first sub switch K1, respectively. One end of the second sub-switch K2 is connected to the other end of the first resistor R1, and the other end of the second sub-switch K2 is connected to the other end of the first sub-switch K1. Specifically, the first sub-switch K1 and the second sub-switch K2 are respectively connected to the rectifier module 300 through the inductor L0, and the external main control module controls the power supply module 100 to be in the power transmission state of the rectifier module 300 by controlling the conduction states of the first sub-switch K1 and the second sub-switch K2.
In some embodiments, power module 100 includes: a traction net and a pantograph. One end of the pantograph is connected with the traction net, and the other end of the pantograph is respectively connected with one end of the first sub-switch K1 and one end of the first resistor R1. Specifically, the traction grid is connected to an external power system, and the traction grid transmits power to the rectifier module 300 through the pantograph.
In some embodiments, the traction drive system further comprises: at least one third sub-switch K3 and a second resistor R2. One end of the third sub-switch K3 is connected to the second sub-module 320, one end of the second resistor R2 is connected to the other end of the third sub-switch K3, and the other end of the second resistor R2 is connected to the second sub-module 320. Specifically, the rectifying module 300 is connected to the inverter module 400 through the third sub-switch K3 and the second resistor R2, and the main control module controls the connection state of the rectifying module 300 and the inverter module 400 by controlling the conduction state of the third sub-switch K3. It is understood that the number of the third sub-switches K3 can be adjusted according to practical situations, and the embodiments of the present application are not limited in particular.
In a specific embodiment, the first pass-through module and the second pass-through module should be balanced because a heavy-duty electric locomotive requires a traction motor to operate stably at a very low torque response for a long time in actual conditions. The balance of the first and second pass-through modules capacitance voltages can be controlled in a two-level manner of energy sum and difference, ucpt(first capacitor voltage), ucntEnergy sum (of the second capacitor voltage) can be classified as active regulation, closed-loop output of energy sumAnd the output is taken as a direct current instruction, namely representing active input. Through the PI regulator, the output signal of the rectifier module is directly used as a common mode quantity to be added into voltage commands of an upper bridge arm and a lower bridge arm of the inverter module, under the steady state condition, the first capacitor and the second capacitor have no obvious low-order harmonic, and the inverter module outputs a smooth motor control signal.
The traction transmission system provided by the embodiment of the application improves the driving efficiency of the electric locomotive and reduces the driving cost of the electric locomotive through the specific connection structure and connection relation of the rectification module and the inversion module. Through the specific connection structure of the first through module and the second through module and the capacitance balancing method, the electric locomotive can still normally operate under the extremely low frequency working condition, and the applicability of the traction transmission system is improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims (13)

1. Traction drive system for an electric locomotive, characterized in that it comprises:
the power supply module is used for providing a power supply signal;
one end of the switch module is connected with the power supply module and is used for controlling the power supply state of the power supply module;
the rectification module is connected with the other end of the switch module and is used for rectifying the power supply signal;
the inversion module is connected with the rectification module and is used for performing inversion operation on the rectified power supply signal;
and the motor is connected with the inverter module.
2. The traction drive system as recited in claim 1, further comprising:
and the auxiliary power supply module is connected with the other end of the switch module and is used for providing an auxiliary electric signal for the electric locomotive.
3. The traction drive system as recited in claim 2, wherein the rectifier module comprises:
the first submodule comprises at least two first half-bridge units and at least two first full-bridge units, and the at least two first half-bridge units are connected with the at least two first full-bridge units at intervals;
the second submodule is connected with the first submodule and comprises at least two second half-bridge units and at least two second full-bridge units, and the at least two second half-bridge units are connected with the at least two second full-bridge units at intervals;
the first coupling inductor is connected with the first sub-module;
and the second coupling inductor is connected with the second submodule.
4. The traction drive system of claim 3, wherein the inverter module comprises:
the first through module is connected with one end of the second sub module and used for reducing harmonic components of the traction transmission system;
the third sub-module comprises at least three third half-bridge units, and the at least three third half-bridge units are correspondingly connected with the first through module;
a fourth sub-module comprising at least three fourth half-bridge cells;
one end of the third coupling inductor is connected with the third sub-module, and the other end of the third coupling inductor is connected with the fourth sub-module;
and the second through module is correspondingly connected with at least three fourth half-bridge units and is connected with the other end of the second sub-module.
5. The traction drive system as recited in claim 4, wherein the first through module comprises: the first switch unit, the second switch unit and the third switch unit are respectively and correspondingly connected with the three third half-bridge units;
the second pass-through module includes: the fourth switch unit, the fifth switch unit and the sixth switch unit are respectively and correspondingly connected with the three fourth half-bridge units.
6. The traction drive system as in claim 5, wherein the first through module further comprises: a first capacitor connected to the third switching unit;
the first switching unit includes: the collector of the first IGBT tube is connected with the second sub-module, the emitter of the first IGBT tube is respectively connected with the collector of the second IGBT tube and the corresponding third half-bridge unit, and the emitter of the second IGBT tube is connected with the second switch unit;
the second switching unit includes: a collector of the third IGBT tube is connected with the second sub-module, an emitter of the third IGBT tube is respectively connected with a collector of the fourth IGBT tube and the corresponding third half-bridge unit, and an emitter of the fourth IGBT tube is connected with the third switch unit;
the third switching unit includes: the collector electrode of the fifth IGBT tube is connected with the second sub-module, the emitter electrode of the fifth IGBT tube is respectively connected with the collector electrode of the sixth IGBT tube and the corresponding third half-bridge unit, and the emitter electrode of the sixth IGBT tube is connected with the first capacitor.
7. The traction drive system as recited in claim 6, wherein the second pass-through module further comprises: a second capacitor connected to the sixth switching unit;
the fourth switching unit includes: a collector of the seventh IGBT tube is connected with the second capacitor, an emitter of the seventh IGBT tube is respectively connected with a collector of the eighth IGBT tube and a corresponding fourth half-bridge unit, and an emitter of the eighth IGBT tube is connected with the second capacitor;
the fifth switching unit includes: a ninth IGBT tube and a tenth IGBT tube, wherein a collector of the ninth IGBT tube is connected with the second capacitor, an emitter of the ninth IGBT tube is respectively connected with a collector of the tenth IGBT tube and a corresponding fourth half-bridge unit, and an emitter of the tenth IGBT tube is connected with the second capacitor;
the sixth switching unit includes: the collector of the eleventh IGBT tube is connected with the second capacitor, the emitter of the eleventh IGBT tube is respectively connected with the collector of the twelfth IGBT tube and the corresponding fourth half-bridge unit, and the emitter of the twelfth IGBT tube is connected with the second capacitor.
8. The traction drive system according to any one of claims 4 to 7, wherein the first half-bridge unit, the second half-bridge unit, the third half-bridge unit and the fourth half-bridge unit each comprise:
a third capacitor;
a thirteenth IGBT tube, wherein the collector electrode of the thirteenth IGBT tube is connected with the third capacitor;
and a collector of the fourteenth IGBT tube is connected with an emitter of the thirteenth IGBT tube, and an emitter of the fourteenth IGBT tube is connected with the third capacitor.
9. The traction drive system of claim 8, wherein the first full-bridge cell and the second full-bridge cell each comprise:
a fourth capacitor;
a fifteenth IGBT tube, wherein the collector of the fifteenth IGBT tube is connected with the fourth capacitor;
a sixteenth IGBT tube, wherein a collector of the sixteenth IGBT tube is connected with an emitter of the fifteenth IGBT tube, and an emitter of the sixteenth IGBT tube is connected with the fourth capacitor;
a seventeenth IGBT tube, wherein a collector electrode of the seventeenth IGBT tube is connected with a collector electrode of the fifteenth IGBT tube;
and the collector of the eighteenth IGBT tube is connected with the emitter of the seventeenth IGBT tube, and the emitter of the eighteenth IGBT tube is connected with the emitter of the sixteenth IGBT tube.
10. The traction drive system of claim 9, wherein the auxiliary power module comprises:
a transformer, a primary coil of which is connected with the switch module;
a first converter connected to a secondary coil of the transformer;
a fifth capacitor connected to the first converter;
and the second converter is connected with the fifth capacitor.
11. The traction drive system of claim 10, wherein the switch module comprises:
one end of the first sub-switch is connected with the power supply module, and the other end of the first sub-switch is connected with the rectification module;
one end of the first resistor is connected with the power supply module and one end of the first sub-switch respectively;
and one end of the second sub-switch is connected with the other end of the first resistor, and the other end of the second sub-switch is connected with the other end of the first sub-switch.
12. The traction drive system of claim 11, wherein the power module comprises:
a hauling net;
and one end of the pantograph is connected with the traction net, and the other end of the pantograph is respectively connected with one end of the first sub-switch and one end of the first resistor.
13. The traction drive system as recited in claim 12, further comprising:
at least one third sub-switch, one end of which is connected with the second sub-module;
and one end of the second resistor is connected with the other end of the third sub-switch, and the other end of the second resistor is connected with the second sub-module.
CN202110079836.5A 2021-01-21 2021-01-21 Traction drive system Pending CN112886829A (en)

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Application publication date: 20210601