CN107911033B - Design method for optimizing total stray inductance of main circuit and locomotive variable-current power unit - Google Patents
Design method for optimizing total stray inductance of main circuit and locomotive variable-current power unit Download PDFInfo
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- CN107911033B CN107911033B CN201711388371.1A CN201711388371A CN107911033B CN 107911033 B CN107911033 B CN 107911033B CN 201711388371 A CN201711388371 A CN 201711388371A CN 107911033 B CN107911033 B CN 107911033B
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- 238000013461 design Methods 0.000 title claims abstract description 38
- 230000003137 locomotive effect Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010521 absorption reaction Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims description 59
- 239000003990 capacitor Substances 0.000 claims description 23
- 238000004088 simulation Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
-
- 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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
-
- 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
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- 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
-
- 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
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a design method for optimizing the overall stray inductance of a main circuit and a locomotive variable current power unit. The invention provides an optimal design method of the stray inductance of the main circuit aiming at the influence of the stray inductance of the main circuit on a switching device, and the method is applied to the design and development of a variable current power unit of an internal combustion locomotive. The design can reduce the use of the absorption circuit of the switching device, reduce the design cost and the volume and the weight of the device while ensuring the reliable operation of the switching device, and ensure that the design of a locomotive converter system is more optimized.
Description
Technical Field
The invention belongs to the technical field of diesel locomotives, relates to a locomotive variable-current power unit, and particularly relates to a design method for optimizing total stray inductance of a main circuit and the locomotive variable-current power unit.
Background
The development of locomotive alternating current transmission technology adopts a high-power IGBT as a converter of a switching device, and the application of the converter is increasingly wide. With the improvement of the power level of the converter, the requirements on the voltage resistance, overcurrent, insulation, heat dissipation and other capacities are more severe, and a high-power switching device, a large-size passive element and a heat dissipation system are often needed to be adopted, so that the size of connecting wires among the switching devices is increased, the distance between conductors is prolonged, and the stray parameters of a main circuit connecting wire are increased. The stray parameters of the direct current bus can cause damage to devices and equipment, and have great influence on the reliability and the operation performance of the system, especially in the transient current conversion process.
The alternating current transmission system of the diesel locomotive generates power for a single diesel engine unit, the diesel engine drags a main generator to output three-phase alternating current voltage, and the traction motor is driven through an uncontrolled rectifying circuit, a chopper circuit, an intermediate direct current link and an inverter circuit to complete locomotive traction control, and the principle of the main circuit of the system is shown as a figure 1.
Because of the limitation of locomotive space, and also in order to facilitate the maintenance of the main circuit, the existing converter power unit gradually adopts a modularized design, and integrates a plurality of switch devices of the main circuit, a driving circuit, a radiator, a main circuit wire and the like to form the power unit. The power unit main circuit connection also starts to adopt a laminated busbar technology to replace the traditional cable stranded wire mode, stray inductance of the main circuit is reduced by increasing overlapping coupling area between positive and negative buses, meanwhile, connection between high-current and high-voltage switching devices is realized by utilizing a smaller space, system cost is reduced, and equipment reliability and quality are improved.
Because the locomotive main circuit comprises a rectifying unit, a direct current link in the middle of a chopping unit, an inverter circuit and the like, the locomotive main circuit as a composite busbar connected with the main circuit also comprises various types, such as: rectifying + chopper module composite busbar, inverter module composite busbar, capacitor busbar connected with intermediate support capacitor, etc. In the prior art, the design division is finer, but because of the difference of the design division, as the designer of the power module, only the stray inductance parameter of the composite busbar of the module is considered, and the designer of the converter cabinet usually only considers the rationality of the structure for the design of the capacitor busbar, because the converter cabinet is not directly connected with a switching device, and the electrical performance of the converter cabinet cannot be considered. As the whole assembled converter, an absorption circuit is needed to be added to avoid damage to the switching device caused by the overall stray inductance parameter.
In the prior art, although the stray inductance of a single power module meets the requirements, the stray inductance value of the whole system still cannot meet the requirements of a switching device, so that an absorption circuit is additionally added, and the reliable operation of the switching device is ensured. The absorption circuit increases the volume and weight of the power unit, occupies large space, and causes the system to be bulky and the design cost to be increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a design method for optimizing the overall stray inductance of a main circuit and a locomotive variable current power unit.
The aim of the invention is realized by the following technical scheme:
8. the invention firstly provides a design method for optimizing the overall stray inductance of a main circuit, which comprises the following steps: the main circuit is connected with the composite busbar, and in the design of the power module and the busbar of the supporting capacitor of the converter, the stray inductance design parameters of the whole system are considered, the requirements of the stray inductances of all parts are met, and the absorption circuit is eliminated.
Further, in the above method: according to the layout and structure requirements of the device, designing a composite busbar of a single module, and performing simulation analysis and test to ensure that stray inductance of the composite busbar of the single module meets the application requirements of the device; and then, assembling the composite busbar of the single module and the composite busbar of the supporting capacitor of the converter to perform joint simulation, and adjusting the layout of the device according to the simulation result so as to adjust the structure of the composite busbar, change the shape of the output end of the composite busbar, the shape and the size of the lap joint surface and the connection mode of the output terminals, so that the stray inductance of the composite busbar of the single module is minimized, and the stray inductance of a main circuit system is minimized.
The invention also provides a locomotive variable current power unit based on the design method for optimizing the total stray inductance of the main circuit: the direct current output end of the rectifying and chopping module composite busbar, the direct current input end of the inversion module composite busbar and the output end terminal of the capacitor composite busbar are connected back to back; the capacitor composite busbar is connected with the output of the rectifying and chopping module composite busbar and the input of the inversion module composite busbar; the intermediate loop support capacitor is arranged near the direct current bus terminal of the power module.
Further, the rectifying and chopping module composite busbar is arranged in the rectifying and chopping power module, and the rectifying and chopping power module comprises bridge arms of a rectifying circuit and chopping branches of a chopping circuit, namely each group of bridge arms and one path of chopping branches form a rectifying and chopping power phase module.
The rectifying circuit is composed of three groups of independent bridge arms. The inverter circuit is formed by connecting three independent three-phase full-bridge controllable inverter power modules in parallel.
The chopper circuit is composed of three independent chopper branches.
The invention has the following beneficial effects:
the invention provides a design method for optimizing the total stray inductance of a main circuit and a locomotive variable current power unit, which aims at the influence of the stray inductance of the main circuit on a switching device, provides the optimal design method for the stray inductance of the main circuit, and is applied to the design and development of the variable current power unit of an internal combustion locomotive. The design can reduce the use of the absorption circuit of the switching device, reduce the design cost and the volume and the weight of the device while ensuring the reliable operation of the switching device, and ensure that the design of a locomotive converter system is more optimized.
Furthermore, the invention adopts the low-inductance composite busbar technology, saves space, is convenient for installation and maintenance, and reduces maintenance cost.
Furthermore, the systematic and integrated stray inductance design of the main circuit ensures the reliable operation of the switching device.
Furthermore, the invention omits an IGBT absorption loop, reduces the cost of a power unit and reduces the volume and the weight.
Drawings
FIG. 1 is a schematic diagram of a main circuit of an AC transmission system of an internal combustion locomotive;
FIG. 2 is a main circuit topology of the present invention;
FIG. 3 is a schematic diagram of a power cell layout of the present invention;
FIG. 4 is a schematic diagram of a composite busbar structure of the converter cabinet of the invention;
fig. 5 is a schematic structural diagram of a composite busbar 1 of a rectifying module according to the present invention;
fig. 6 is a schematic structural diagram of an inverter module composite busbar 2 according to the present invention.
Wherein: 1 is a rectifying and chopping module composite busbar; 2 is an inversion module composite busbar; 3 is a capacitor composite busbar; 4 is a capacitor.
Detailed Description
In the switching process of the high-power frequency converter switching device, high peak voltage can be generated due to the influence of parasitic inductance on a direct-current energy storage capacitor to a direct-current bus of the IGBT device and self inductance of the IGBT module, and the peak voltage can overheat the device and even cause the IGBT to run away and exceed a rated safe working area of the device to be damaged. Therefore, the peak voltage generated in the switching process must be limited within the allowable range, and one of the methods adopts the stacked busbar technology to reduce the distributed inductance of the power busbar of the direct current loop.
In design, the influence of stray inductance on the turn-off of the power device is not only influenced by the stray inductance in a single power module, but also influenced by the stray inductance of the power module and the supporting capacitor which are connected as a part of the main circuit. After the connection of the converter cabinet is completed, the total stray inductance of the system is not a simple superposition of the stray inductances of the composite busbar of the power modules, and different lap joint surface designs have great influence on the stray inductances of the system.
Therefore, the invention firstly proposes a design method for optimizing the overall stray inductance of a main circuit, which comprises the following steps: the main circuit is connected with the composite busbar, and in the design of the power module and the busbar of the supporting capacitor of the converter, the stray inductance design parameter of the whole system is considered, the stray inductance requirements of all parts are met, and the absorption circuit is canceled, so that the structure of the device is further simplified, the weight is reduced, the volume is reduced, and the cost is reduced.
In the method of the invention: according to the layout and structure requirements of the device, designing a composite busbar of a single module, and performing simulation analysis and test to ensure that stray inductance of the composite busbar of the single module meets the application requirements of the device; and then, assembling the composite busbar of the single module and the composite busbar of the supporting capacitor of the converter to perform joint simulation, and adjusting the layout of the device according to the simulation result so as to adjust the structure of the composite busbar, change the shape of the output end of the composite busbar, the shape and the size of the lap joint surface and the connection mode of the output terminals, so that the stray inductance of the composite busbar of the single module is minimized, and the stray inductance of a main circuit system is minimized.
The invention also provides a locomotive variable current power unit based on the design method for optimizing the total stray inductance of the main circuit, as shown in fig. 4: the direct current output end of the rectifying and chopping module composite busbar 1 (the structure is shown in fig. 5), the direct current input end of the inversion module composite busbar 2 (the structure is shown in fig. 6) and the output end terminal of the capacitor composite busbar 3 are connected back to back; the capacitor composite busbar 3 is connected with the output of the rectifying and chopping module composite busbar 1 and the input of the inversion module composite busbar 2; the intermediate loop support capacitor is arranged near the direct current bus terminal of the power module, so that the connection between the capacitor busbar and the power module is facilitated, the use of the transition busbar is reduced, and the stray inductance is optimized.
The rectifying and chopping module composite busbar 1 is arranged in a rectifying and chopping power module, wherein the rectifying and chopping power module comprises bridge arms of a rectifying circuit and chopping branches of a chopping circuit, namely each group of bridge arms and one path of chopping branches form the rectifying and chopping power module.
As shown in fig. 2 and 3, the locomotive variable-current power unit of the invention further comprises a rectifying circuit, a chopper circuit and an inverter circuit; the rectifying circuit is formed by connecting three groups of bridge arms in parallel to form a complete three-phase rectifying circuit; the chopper circuit comprises three independent chopper branches, and each chopper branch is formed by connecting a single tube and a chopper resistor in series. A group of rectifying bridge arms and a path of chopping branches form a traction rectifying and chopping phase module, and after the three phase modules are connected in parallel, the three phase modules are connected with the positive end and the negative end of a direct current bus in a middle direct current link in a bridging manner; the middle direct current link is connected to the inverter circuit; the inverse transformer circuit is formed by connecting three inverse power modules in parallel. The rectification circuit, the chopper circuit and the inverter circuit are all arranged in a cabinet body of the converter cabinet of the internal combustion locomotive, three mutually independent air channels for radiating are arranged in the cabinet body, and each independent air channel is provided with a traction rectification and chopper phase module and an inverter power module. The inversion power module is a three-phase inversion power unit. The three-phase inversion power unit is connected with a motor.
The whole converter cabinet comprises three rectifying and chopping phase power modules and three-phase inversion power units. Therefore, the whole converter cabinet only comprises two types of modules, the designed system type is favorable for the exchange of power units, and the converter cabinet is convenient to install and maintain.
The three mutually independent air channels are identical in structural layout, the radiator part of the module is arranged in the three air channels, and other parts of the module are arranged at the front part of the air channels and are isolated from the air channels through sealing strips. The uniform layout mode is beneficial to design selection and heat dissipation design of the power module.
The power units of the invention also comprise a radiator, a switching device, a driving plate, an adapting plate, a low-inductance composite busbar, a composite shielding plate and other components, and according to the system instruction, the functions of switching, driving, protecting, radiating and the like of the IGBT are completed, and finally, the input three-phase alternating current is subjected to alternating current-direct current change to drive a traction motor, so that the locomotive traction function is completed.
Claims (6)
1. A design method for optimizing the overall stray inductance of a main circuit is characterized in that the main circuit is connected with a composite busbar, in the design of a power module and a supporting capacitor busbar of a converter, the stray inductance design parameter of the whole system is considered, the requirements of the stray inductances of all parts are met, and an absorption circuit is eliminated;
according to the layout and structure requirements of the device, designing a composite busbar of a single module, and performing simulation analysis and test to ensure that stray inductance of the composite busbar of the single module meets the application requirements of the device; and then, assembling the composite busbar of the single module and the composite busbar of the supporting capacitor of the converter to perform joint simulation, and adjusting the layout of the device according to the simulation result so as to adjust the structure of the composite busbar, change the shape of the output end of the composite busbar, the shape and the size of the lap joint surface and the connection mode of the output terminals, so that the stray inductance of the composite busbar of the single module is minimized, and the stray inductance of a main circuit system is minimized.
2. The locomotive variable current power unit based on the design method for optimizing the overall stray inductance of the main circuit according to claim 1 is characterized in that a direct current output end of the rectifying and chopping module composite busbar (1), a direct current input end of the inversion module composite busbar (2) and an output end terminal of the capacitor composite busbar (3) are connected in a back-to-back mode; the capacitor composite busbar (3) is connected with the output of the rectifying and chopping module composite busbar (1) and the input of the inversion module composite busbar (2); the middle loop supporting capacitor is arranged close to the direct current bus terminal of the power module;
the locomotive variable-current power unit comprises a rectifying circuit, an inverter circuit and a chopper circuit.
3. The locomotive variable current power unit according to claim 2, wherein the rectifying and chopping module composite busbar (1) is arranged in a rectifying and chopping power module, the rectifying and chopping power module comprises bridge arms of a rectifying circuit and chopping branches of a chopping circuit, namely each group of bridge arms and one path of chopping branches form a rectifying and chopping power phase module.
4. A locomotive variable current power unit according to claim 3 wherein the rectifying circuit is comprised of three separate sets of legs.
5. The locomotive variable current power unit of claim 3 wherein the inverter circuit is comprised of three independent three phase full bridge controllable inverter power modules connected in parallel.
6. A locomotive variable current power unit according to claim 3 wherein the chopper circuit is comprised of three separate chopper branches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711388371.1A CN107911033B (en) | 2017-12-20 | 2017-12-20 | Design method for optimizing total stray inductance of main circuit and locomotive variable-current power unit |
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| CN201711388371.1A CN107911033B (en) | 2017-12-20 | 2017-12-20 | Design method for optimizing total stray inductance of main circuit and locomotive variable-current power unit |
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| CN107911033A CN107911033A (en) | 2018-04-13 |
| CN107911033B true CN107911033B (en) | 2024-03-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110797852A (en) * | 2019-10-12 | 2020-02-14 | 中车永济电机有限公司 | High-pressure protection system for diesel locomotive |
| CN113014118A (en) * | 2021-04-21 | 2021-06-22 | 株洲中车时代电气股份有限公司 | Current transformer |
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| CN107911033A (en) | 2018-04-13 |
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