CN113067484A - Current transformer - Google Patents
Current transformer Download PDFInfo
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- CN113067484A CN113067484A CN201911418488.9A CN201911418488A CN113067484A CN 113067484 A CN113067484 A CN 113067484A CN 201911418488 A CN201911418488 A CN 201911418488A CN 113067484 A CN113067484 A CN 113067484A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- 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
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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
- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20927—Liquid coolant without phase change
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Thermal Sciences (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Inverter Devices (AREA)
Abstract
The converter provided by the invention adopts the main circuit provided with the full SiC power unit to replace the traditional silicon Si power unit, so that the frequency range of the converter variable voltage variable frequency power supply is enlarged, the grid side current harmonic wave is reduced and the quality of the converter power supply is improved under the same environment, working condition and heat dissipation condition.
Description
Technical Field
The invention relates to the technical field of power electronic devices, in particular to a converter.
Background
The high-speed continuous development of economy puts pressure on environmental protection and energy supply. The active development of green economy becomes a new mode of economic development in China, and energy conservation and emission reduction become the primary tasks in China. Power electronics are the key to power electronics technology, controlling the core of electrical energy generation, transmission, conversion and storage. The energy transmission efficiency can be greatly improved by improving the performance of the power electronic device, and the power electronic device technology is one of the key technologies for saving energy, reducing consumption and developing green economy in China.
At present, devices such as Insulated Gate Bipolar Transistors (IGBTs) and Metal-Oxide-Semiconductor Field Effect transistors (MOSFETs) based on silicon materials have performance approaching the theoretical limit determined by physical characteristics of the materials, but cannot meet the requirements of energy conservation and emission reduction on the performance of power electronic devices. Furthermore, a silicon-insulated gate bipolar transistor Si IGBT is used as a converter of the device, and a low switching frequency control method is usually adopted to increase the output current of the power device and reduce the temperature rise of the IGBT.
However, the SiIGBT converter adopts a low switching frequency control method, which increases the output current of the power device, resulting in poor quality of the input/output power supply.
Disclosure of Invention
The invention provides a converter, which improves the efficiency of input and output end equipment under the condition of unchanged power density and provides a high-quality power supply for a traction motor.
In a first aspect, the present invention provides a current transformer comprising: a Traction Control Unit (TCU) and a main circuit provided with a full SiC power Unit;
the main circuit is respectively connected with the output end of the traction transformer and the input end of the traction motor; the traction control device TCU is connected with the full SiC power unit of the main circuit;
the traction transformer supplies power to the converter;
and the traction control device TCU is used for controlling the main circuit to output current for controlling the traction motor to work.
Further, the full SiC power cell includes:
the first full SiC power unit, the second full SiC power unit and the full SiC inversion power unit;
the first full SiC power unit is connected with a first end of the traction transformer, the second full SiC power unit is connected with a second end of the traction transformer, and the full SiC inversion power unit is connected with the traction motor; the first full SiC power unit, the second full SiC power unit and the full SiC inversion power unit are respectively connected to a P endpoint and a Q endpoint on a bus of the main circuit;
the first full SiC power unit and the second full SiC power unit are used for converting alternating current voltage input by the traction transformer into direct current voltage; and the full SiC inversion power unit is used for converting the direct-current voltage into alternating-current voltage.
In a specific implementation, the main circuit further includes:
support capacitances C1, C2, and C3;
the support capacitor C1 is connected in parallel with the first full SiC power cell; the support capacitor C2 is connected in parallel with the second full SiC power cell;
the supporting capacitor C3 is connected with the inversion power unit in parallel.
In a specific implementation, the main circuit further includes:
a secondary filtering unit;
two ends of the secondary filtering unit are respectively connected with the P endpoint and the Q endpoint; the secondary filtering unit includes: an inductor L, a capacitor C11 and a capacitor C12; the capacitor C11 and the capacitor C12 are connected in parallel and then are connected in series with the inductor L;
and the secondary filtering unit is used for filtering the bus alternating current component of the main circuit.
In a specific implementation, the main circuit further includes:
a contactor;
the contactor is connected between the traction transformer and the first full SiC power unit; the contactor includes: a main contactor K1, a precharge contactor K2, and a precharge resistor R1; the pre-charging contactor K2 is connected with the pre-charging resistor R1 in series and then is connected with the main contactor K1 in parallel;
the contactor is used for controlling the on and off of the converter.
In a specific implementation, the main circuit further includes:
an overpressure absorbing unit;
one end of the overvoltage absorption unit is connected with the second full SiC power unit, and the other end of the overvoltage absorption unit is connected with the Q end point;
the overpressure absorbing unit includes: a current sensor A1 and a resistor R2 for overvoltage absorption of the main circuit voltage.
Optionally, the main circuit further includes:
a composite busbar;
the composite busbar is used for connecting the first full SiC power unit, the second full SiC power unit, the full SiC inverter power unit and supporting capacitors C1, C2 and C3.
In a specific implementation, the main circuit further includes:
a slow discharge resistor R3;
two ends of the slow discharge resistor R3 are respectively connected with the P end point and the Q end point, and the slow discharge resistor R3 is used for releasing electric energy stored at the direct current side of the main circuit after the converter is powered off and reducing the voltage between the direct current buses of the main circuit.
In a specific implementation, the main circuit further includes:
a ground protection resistance unit;
two ends of the grounding protection resistance unit are respectively connected with the P end point and the Q end point; the ground protection resistance unit includes: resistors R11, R12, R13, a voltage sensor A2 and a filter capacitor C21;
the resistors R11, R12 and R13 are connected in series, the voltage sensor A2, the filter capacitor C21 and the resistor R13 are connected in parallel, and one end of the filter capacitor C21 is grounded.
In a specific implementation, the converter further includes:
a cooling device;
the cooling device includes: a water-cooled substrate and a cooling pipeline;
the water-cooled substrate is attached to the full SiC power unit;
and the cooling pipeline is connected with the input end and the output end of the water-cooling substrate, so that cooling water flows through the water-cooling substrate of the full SiC power unit to cool the full SiC power unit.
The converter provided by the embodiment of the invention adopts the main circuit provided with the full SiC power unit to replace the traditional silicon Si power unit, so that the frequency range of the converter variable voltage variable frequency power supply is expanded, the grid side current harmonic wave is reduced and the quality of the converter power supply is improved under the same environment, working condition and heat dissipation condition.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a first embodiment of a current transformer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of a current transformer according to the present invention;
fig. 3 is a schematic structural diagram of a third embodiment of a current transformer according to an embodiment of the present invention;
fig. 4 is a schematic layout diagram of an embodiment of a current transformer according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As used herein, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Reference throughout this specification to "one embodiment" or "another embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in this embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The converter provided by the invention can be applied to an electric transmission system of an electric locomotive.
The power unit generally adopted by the existing 3300V-grade high-power locomotive and motor car converter is a silicon-silicon (Si) power unit, and in view of the requirements of high voltage and large current of a system and the defect of high switching loss of a Si-IGBT device, a low switching frequency control mode is usually adopted, so that the output current of the power device is increased, the temperature rise of the IGBT is reduced, and the quality of an input and output power supply is low easily caused.
In order to overcome the problems in the prior art, the scheme provides a converter, and in a possible application scene, a converter suitable for a high-power electric locomotive is designed by taking a 3300V grade full Silicon Carbide (SiC) power device as a core device. Under the same environment, working condition and heat dissipation condition, the switching frequency of the converter using the full SiC power device is integrally doubled compared with that of the converter using the Si power device, the efficiency of input and output end equipment can be improved under the condition that the heating power of the converter is not changed, and a variable-voltage variable-frequency high-quality power supply is provided for a locomotive. The switching loss is low due to the full SiC power device.
This scheme is illustrated in detail below by means of several specific examples.
Fig. 1 is a schematic structural diagram of a first embodiment of a current transformer according to an embodiment of the present invention, and as shown in fig. 1, the current transformer includes: a Traction Control Unit (TCU) 01 and a main circuit 02 provided with an all SiC power Unit.
The main circuit 02 is respectively connected with the output end of the traction transformer 03 and the input end of the traction motor 04; the traction control device 01 is connected with the all-SiC power unit 11 of the main circuit 02; the traction transformer 03 supplies power to the converter; the traction control device 01 is used for controlling the main circuit 02 to output current for controlling the work of the traction motor 04.
Optionally, the traction transformer is a single-phase transformer, and the single-phase alternating-current voltage is input to the main circuit.
The traction control device 01 is further connected to an upper computer, for example, a Main Processing Unit (MPU) of a train, and receives a control instruction sent by the upper computer, where the control instruction is used to instruct the converter to operate to generate traction force of a corresponding magnitude, and the traction control device 01 receives the control instruction, that is, controls the four-quadrant side and the inverter side of the full SiC power Unit of the converter, so that the main circuit outputs current of a corresponding magnitude to control the traction motor to operate and generate traction force indicated by the control instruction. It should be understood that the switching frequency of the full SiC power unit is greatly increased (the switching frequency is increased by about one time in the same heat dissipation environment) compared with the switching frequency of the Si power unit, and the traction control device 01 correspondingly controls the switching frequency of the full SiC power unit, for example, the switching frequency is set according to the carrier frequency in the four-quadrant side modulation mode of the full SiC power unit, the modulation curve is set on the inverter side, and the switching frequency is controlled according to the modulation curve.
The converter provided by the embodiment comprises a traction control device TCU and a main circuit provided with a full SiC power unit, wherein the main circuit is respectively connected with the output end of a traction transformer and the input end of a traction motor, the traction control device TCU is connected with the full SiC power unit of the main circuit, the traction transformer supplies power to the converter, and the traction control device TCU is used for controlling the main circuit to output current for controlling the work of the traction motor.
On the basis of the embodiment shown in fig. 1, fig. 2 is a schematic structural diagram of a second embodiment of a current transformer provided in the embodiment of the present invention, and as shown in fig. 2, the full SiC power unit 11 includes:
a first full SiC power unit 101, a second full SiC power unit 102, and a full SiC inverter power unit 103;
the first full SiC power unit 101 is connected to a first end of the traction transformer 03, the second full SiC power unit 102 is connected to a second end of the traction transformer 03, and the full SiC inverter power unit 103 is connected to the traction motor 04.
First full SiC power cell 101, second full SiC power cell 102, and full SiC inverter power cell 103 are each connected to the P and Q terminals, respectively, on the bus of the main circuit.
The first full SiC power unit 101 and the second full SiC power unit 102 are used for converting an alternating current voltage input by the traction transformer 03 into a stable direct current voltage; the full SiC inverter power unit 103 is configured to convert a dc voltage into an ac voltage, and output the ac voltage to the traction motor.
As an example, the traction control device 01 sets a switching frequency for the first full SiC power unit 101 and the second full SiC power unit 102 according to a carrier frequency in a four-quadrant-side modulation scheme of the full SiC power unit, and implements four-quadrant control over the first full SiC power unit 101 and the second full SiC power unit 102; the traction control device 01 sets a modulation curve for the full SiC inverter power unit 103 on the inverter side, and controls the switching frequency according to the modulation curve, thereby realizing the inverter control of the full SiC inverter power unit 103.
Optionally, the first full SiC power unit is a four-quadrant rectification full SiC power unit, the second full SiC power unit is a four-quadrant chopper-containing full SiC power unit, and the second full SiC power unit is configured to control a dc voltage of the main circuit to be stable, for example, when a bus voltage exceeds a preset value, the bus voltage is lower than the preset value by the second SiC power unit.
Fig. 3 is a schematic structural diagram of a third embodiment of a current transformer according to an embodiment of the present invention.
As an example, as shown in fig. 3, the first full SiC power unit 101 is composed of four power devices, and each two of the four power devices are connected in series and then connected in parallel to constitute the first full SiC power unit 101. The second full SiC power unit 102 is composed of 5 power devices, three groups of power devices are connected in parallel to form the second full SiC power unit 102, two groups of power devices are connected in series to form the second full SiC power unit, and the other group of power devices includes one power device. The full SiC inversion power unit consists of 6 power devices, and every two full SiC inversion power units are connected in series and then connected in parallel to form the full SiC inversion power unit.
Optionally, the power device may be a half-bridge packaged silicon carbide-Metal Oxide Semiconductor Field Effect Transistor (SiC-Metal-Oxide-Semiconductor Field-Effect Transistor, SiC-MOSFET).
Optionally, each power unit is connected with a digital driving unit, and the digital driving unit is used for driving the power unit to work according to the control of the traction control device TCU, and can reliably drive a 3300V full SiC power device.
Optionally, a low-inductance composite busbar is designed inside each power unit, so as to meet the requirement of a SiC device on high switching frequency.
As shown in fig. 3, the main circuit 02 further includes: a support capacitor 3 comprising C1, C2, and C3; a support capacitor C1 is connected in parallel with the first full SiC power cell.
A support capacitor C2 is connected in parallel with the second full SiC power cell; and the support capacitor C3 is connected with the inversion power unit in parallel.
The supporting capacitors C1, C2 and C3 are used for supporting direct-current bus voltage, providing reactive power exchange for four-quadrant inversion and compensation of transient power imbalance caused by inconsistent switching frequencies of four-quadrant side and inversion side.
As shown in fig. 3, the main circuit 02 further includes:
a secondary filtering unit 12; two ends of the secondary filtering unit 12 are respectively connected with a P end point and a Q end point of the bus.
The secondary filtering unit 12 includes: an inductor L, a capacitor C11 and a capacitor C12; the capacitor C11 and the capacitor C12 are connected in parallel and then connected in series with the inductor L.
The secondary filter unit 12 is configured to perform filtering processing on the bus ac component of the main circuit 02. For example, the second filtering unit 12 filters out the harmonic of the 100Hz ac component generated by the four-quadrant side control, so as to ensure the stability of the bus dc voltage.
As shown in fig. 3, the main circuit 02 further includes:
a contactor 13; contactor 13 is connected between traction transformer 03 and first full SiC power cell 101.
The contactor 13 includes: a main contactor K1, a precharge contactor K2, and a precharge resistor R1; the pre-charging contactor K2 is connected in series with a pre-charging resistor R1 and then connected in parallel with the main contactor K1.
The contactor 13 is used for controlling the on-off of the converter, when the converter needs to be switched on, the pre-charging contactor K2 is closed firstly, so that a pre-charging loop is switched on, the damage of devices caused by overlarge instantaneous current is avoided, when the voltage is stable, the main contactor K1 is closed, the pre-charging contactor K2 is disconnected, and the pre-charging process is completed.
As shown in fig. 3, the main circuit 02 further includes:
an overpressure absorbing unit 14; one end of the overvoltage absorption unit 14 is connected to the second full SiC power unit, and the other end of the overvoltage absorption unit 14 is connected to the Q terminal.
The overpressure absorbing unit 14 includes: and the current sensor A1 and the resistor R2 are used for absorbing overvoltage of the voltage of the main circuit and preventing the bus voltage from exceeding a preset value.
In one possible design, the main circuit 02 further comprises:
a composite busbar (not shown); the composite busbar is used for connecting the first full SiC power unit 101, the second full SiC power unit 102, the full SiC inversion power unit 103, the supporting capacitors C1, C2 and C3, stray inductance is reduced through the composite busbar, and a low inductance loop is provided for a main circuit.
As shown in fig. 3, the main circuit 02 further includes:
a ground protection resistance unit 15; both ends of the ground protection resistance unit 15 are connected to the P terminal and the Q terminal, respectively.
The ground protection resistance unit 15 includes: resistors R11, R12, R13, a voltage sensor A2 and a filter capacitor C21; the resistors R11, R12 and R13 are connected in series, the voltage sensor A2, the filter capacitor C21 and the resistor R13 are connected in parallel, and one end of the filter capacitor C21 is grounded.
By acquiring and analyzing the value provided by the voltage sensor a2 in the ground protection resistance unit 15, it can be determined whether the converter circuit is abnormal, and the voltage value acquired by the voltage sensor a2 is typically one third of the bus voltage of the main circuit.
As shown in fig. 3, the main circuit 02 further includes:
and two ends of the slow discharge resistor 16 are respectively connected with the P endpoint and the Q endpoint, and the slow discharge resistor 16 is used for releasing the bus voltage of the main circuit after the converter is powered off to avoid damaging devices.
Optionally, the slow discharge resistor R3 may be an external device disposed in the general locomotive cabinet.
In one possible design, the converter further comprises: the cooling device at least comprises a water-cooling base plate and a cooling pipeline.
The cooling pipeline is connected with the input end and the output end of the water-cooling substrate, so that cooling water flows through the water-cooling substrate of the full SiC power unit to carry out cooling treatment on the full SiC power unit.
Optionally, the cooling device further comprises: water pump, pipeline, casing, connecting piece etc..
Fig. 4 is a schematic layout diagram of an embodiment of a current transformer according to the present invention. As shown in fig. 4, a first full SiC power unit 1 and a second full SiC power unit 2 are disposed at the left side part of the middle part of the converter, and are used for converting the power frequency ac voltage into a dc voltage; the right part is provided with a full Sic inversion power unit 5 which inverts the direct current voltage into a corresponding alternating current voltage to be supplied to a load, such as a traction motor; the supporting capacitor 3 is arranged close to the side of each power unit and used for supporting direct-current bus voltage, providing reactive power exchange for four quadrants and inversion and compensating the instant power imbalance caused by the inconsistency of the switching frequencies of the four quadrants and the inversion; a secondary filter capacitor 4, which is arranged at the left part of the lower part of the converter, is connected with a secondary filter inductor arranged in the traction transformer assembly in series, and is used for filtering the bus alternating current component of the main circuit, such as 100Hz pulsation; the traction control device TCU 6 is distributed at the right side part of the upper part of the converter and is used for controlling the converter to realize the alternating current-direct current-alternating current conversion output of the frequency conversion; the contactor 7 is arranged at the upper left part of the converter, comprises a main contactor, a pre-charging contactor and a pre-charging resistor and is used for controlling the converter to be started and shut down; the composite busbar 8 is used for connecting each power unit and the support capacitor and providing a low-inductance loop for the main circuit; the chopper resistor 9 is arranged on the left side of the top of the converter, connected with the overvoltage chopper branch of the second full SiC power unit and used for performing overvoltage absorption on the voltage of the main circuit and preventing the bus voltage from exceeding a preset value; the grounding protection resistance unit 10 is arranged at the top of the converter and used for judging whether the converter circuit is abnormal or not; and the water cooling pipeline 11 is used for cooling the full SiC power unit.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The converter is characterized by comprising a traction control device TCU and a main circuit provided with a full SiC power unit;
the main circuit is respectively connected with the output end of the traction transformer and the input end of the traction motor; the traction control device TCU is connected with the full SiC power unit of the main circuit;
the traction transformer supplies power to the converter;
and the traction control device TCU is used for controlling the main circuit to output current for controlling the traction motor to work.
2. The converter of claim 1, wherein the full SiC power cell comprises:
the first full SiC power unit, the second full SiC power unit and the full SiC inversion power unit;
the first full SiC power unit is connected with a first end of the traction transformer, the second full SiC power unit is connected with a second end of the traction transformer, and the full SiC inversion power unit is connected with the traction motor; the first full SiC power unit, the second full SiC power unit and the full SiC inversion power unit are respectively connected to a P endpoint and a Q endpoint on a bus of the main circuit;
the first full SiC power unit and the second full SiC power unit are used for converting alternating current voltage input by the traction transformer into direct current voltage; and the full SiC inversion power unit is used for converting the direct-current voltage into alternating-current voltage.
3. The converter according to claim 2, wherein the main circuit further comprises: support capacitances C1, C2, and C3;
the support capacitor C1 is connected in parallel with the first full SiC power cell; the support capacitor C2 is connected in parallel with the second full SiC power cell; the supporting capacitor C3 is connected with the inversion power unit in parallel.
4. The converter according to claim 1, wherein the main circuit further comprises: a secondary filtering unit;
two ends of the secondary filtering unit are respectively connected with the P endpoint and the Q endpoint; the secondary filtering unit includes: an inductor L, a capacitor C11 and a capacitor C12; the capacitor C11 and the capacitor C12 are connected in parallel and then are connected in series with the inductor L;
and the secondary filtering unit is used for filtering the alternating current component of the main circuit direct current bus.
5. The converter according to claim 2, wherein the main circuit further comprises: a contactor;
the contactor is connected between the traction transformer and the first full SiC power unit; the contactor includes: a main contactor K1, a precharge contactor K2, and a precharge resistor R1; the pre-charging contactor K2 is connected with the pre-charging resistor R1 in series and then is connected with the main contactor K1 in parallel;
the contactor is used for controlling the on and off of the converter.
6. The converter according to claim 1, wherein the main circuit further comprises: an overpressure absorbing unit;
one end of the overvoltage absorption unit is connected with the second full SiC power unit, and the other end of the overvoltage absorption unit is connected with the Q end point; the overpressure absorbing unit includes: a current sensor A1 and a resistor R2 for overvoltage absorption of the main circuit voltage.
7. The converter according to claim 3, wherein the main circuit further comprises: a composite busbar;
the composite busbar is used for connecting the first full SiC power unit, the second full SiC power unit, the full SiC inverter power unit and supporting capacitors C1, C2 and C3.
8. The converter according to claim 1, wherein the main circuit further comprises: a slow discharge resistor R3;
two ends of the slow discharge resistor R3 are respectively connected with the P end point and the Q end point, and the slow discharge resistor R3 is used for releasing electric energy stored at the direct current side of the main circuit after the converter is powered off and reducing the voltage between the direct current buses of the main circuit.
9. The converter according to claim 1, wherein the main circuit further comprises: a ground protection resistance unit;
the two ends of the grounding protection resistance unit are respectively connected with the P end point and the Q end point, and the grounding protection resistance unit comprises: resistors R11, R12, R13, a voltage sensor A2 and a filter capacitor C21; the resistors R11, R12 and R13 are connected in series, the voltage sensor A2, the filter capacitor C21 and the resistor R13 are connected in parallel, and one end of the filter capacitor C21 is grounded.
10. The converter according to any of claims 1 to 9, further comprising: a cooling device;
the cooling device includes: a water-cooled substrate and a cooling pipeline;
the water-cooled substrate is attached to the full SiC power unit;
and the cooling pipeline is connected with the input end and the output end of the water-cooling substrate, so that cooling water flows through the water-cooling substrate of the full SiC power unit to cool the full SiC power unit.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060127704A1 (en) * | 2004-12-10 | 2006-06-15 | Stephen Raiser | Hybrid fuel cell system with battery capacitor energy storage system |
| CN103684002A (en) * | 2012-09-24 | 2014-03-26 | 通用电气公司 | Energy conversion system |
| CN104201908A (en) * | 2014-09-24 | 2014-12-10 | 武汉大学 | Solid-state transformer based locomotive AC-DC-AC traction system and method |
| CN105711431A (en) * | 2014-12-02 | 2016-06-29 | 永济新时速电机电器有限责任公司 | High speed train bogie power supply mode traction converter main circuit |
| CN105720822A (en) * | 2015-12-08 | 2016-06-29 | 国家电网公司 | Bidirectional DC/DC converter based on serial connection of SiC devices |
| CN205967754U (en) * | 2016-08-15 | 2017-02-22 | 华南理工大学 | Multi -functional argon arc of digital siC inverter type welds power based on DSC |
| CN106513956A (en) * | 2016-12-12 | 2017-03-22 | 华南理工大学 | SiC inverter-type plasma cutting power source |
| CN108859874A (en) * | 2017-05-15 | 2018-11-23 | 中车株洲电力机车研究所有限公司 | One kind is completely through alternating current traction power supply system |
| CN109459675A (en) * | 2018-11-16 | 2019-03-12 | 国网江苏省电力有限公司盐城供电分公司 | A kind of SiC power device applications platform for testing characteristics |
| CN209170265U (en) * | 2018-11-30 | 2019-07-26 | 中车永济电机有限公司 | A kind of high-power permanent magnet directly drives electric locomotive current transformer |
| CN110323954A (en) * | 2019-08-08 | 2019-10-11 | 中车青岛四方车辆研究所有限公司 | Three level traction power modules and inverter circuit based on SiC power device |
| CN110445398A (en) * | 2019-07-08 | 2019-11-12 | 中车永济电机有限公司 | A kind of SiC-MOSFET power cell |
-
2019
- 2019-12-31 CN CN201911418488.9A patent/CN113067484A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060127704A1 (en) * | 2004-12-10 | 2006-06-15 | Stephen Raiser | Hybrid fuel cell system with battery capacitor energy storage system |
| CN103684002A (en) * | 2012-09-24 | 2014-03-26 | 通用电气公司 | Energy conversion system |
| CN104201908A (en) * | 2014-09-24 | 2014-12-10 | 武汉大学 | Solid-state transformer based locomotive AC-DC-AC traction system and method |
| CN105711431A (en) * | 2014-12-02 | 2016-06-29 | 永济新时速电机电器有限责任公司 | High speed train bogie power supply mode traction converter main circuit |
| CN105720822A (en) * | 2015-12-08 | 2016-06-29 | 国家电网公司 | Bidirectional DC/DC converter based on serial connection of SiC devices |
| CN205967754U (en) * | 2016-08-15 | 2017-02-22 | 华南理工大学 | Multi -functional argon arc of digital siC inverter type welds power based on DSC |
| CN106513956A (en) * | 2016-12-12 | 2017-03-22 | 华南理工大学 | SiC inverter-type plasma cutting power source |
| CN108859874A (en) * | 2017-05-15 | 2018-11-23 | 中车株洲电力机车研究所有限公司 | One kind is completely through alternating current traction power supply system |
| CN109459675A (en) * | 2018-11-16 | 2019-03-12 | 国网江苏省电力有限公司盐城供电分公司 | A kind of SiC power device applications platform for testing characteristics |
| CN209170265U (en) * | 2018-11-30 | 2019-07-26 | 中车永济电机有限公司 | A kind of high-power permanent magnet directly drives electric locomotive current transformer |
| CN110445398A (en) * | 2019-07-08 | 2019-11-12 | 中车永济电机有限公司 | A kind of SiC-MOSFET power cell |
| CN110323954A (en) * | 2019-08-08 | 2019-10-11 | 中车青岛四方车辆研究所有限公司 | Three level traction power modules and inverter circuit based on SiC power device |
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