CN117767769A - Air-cooled variable-frequency converter - Google Patents
Air-cooled variable-frequency converter Download PDFInfo
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- CN117767769A CN117767769A CN202211555322.3A CN202211555322A CN117767769A CN 117767769 A CN117767769 A CN 117767769A CN 202211555322 A CN202211555322 A CN 202211555322A CN 117767769 A CN117767769 A CN 117767769A
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- frequency converter
- variable frequency
- air
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- 230000017525 heat dissipation Effects 0.000 claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 25
- 238000013461 design Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 15
- 241000274582 Pycnanthus angolensis Species 0.000 claims description 13
- 239000011087 paperboard Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 12
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000009434 installation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
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- 230000010363 phase shift Effects 0.000 description 1
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- 239000000523 sample Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- 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
- H05K7/14—Mounting supporting structure in casing or on frame or rack
-
- 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
- H05K7/18—Construction of rack or frame
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Ac-Ac Conversion (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
Abstract
The invention relates to an air-cooled variable frequency converter, which comprises a box body, wherein the inside of the box body is divided into a left cabin, a middle cabin and a right cabin, an auxiliary control system arranged in the left cabin, a variable frequency converter valve and a multi-winding transformer which are arranged in the middle cabin and are distributed front and back, a station transformer arranged in the right cabin, and a heat dissipation system for dissipating heat in the box body are arranged in the box body; each phase of the variable frequency converter valve comprises a plurality of cascade module units which are in a flattened design, the input side of each cascade module unit with the same phase is connected with the secondary coil of the multi-winding transformer with the same phase, and the output side of each cascade module unit with the same phase is sequentially connected in series from beginning to end through a connecting row. The invention adopts a modularized design, so that the whole structure of the converter valve is simpler and more compact, the occupied space is reduced, the convenience of subsequent maintenance and overhaul is improved, and the stability of the converter valve during operation is increased.
Description
Technical Field
The invention belongs to the technical field of variable frequency converter valves, and particularly relates to an air-cooled variable frequency converter.
Background
In the technical field of high-capacity high-power electronic frequency conversion and conversion, the frequency conversion converter can convert the traditional power frequency voltage into a wide-frequency wide-voltage power supply, has an alternating-current frequency conversion function, and can realize flexible interconnection of power supply areas.
In the existing frequency conversion converter, the converter valve adopts a valve tower structure, namely, the converter valve comprises a plurality of valve layers and supporting insulators arranged between adjacent valve layers and below the bottommost valve layer, each valve layer comprises a plurality of valve modules, and each valve module comprises a plurality of power electronic devices connected in series. The converter valve of the form is complex in structure, large in occupied space and difficult to maintain and overhaul in the later period, and stability in the using process cannot be guaranteed.
Disclosure of Invention
The invention aims to provide an air-cooled variable-frequency converter so as to solve the problem that a converter valve structure is complex.
The air-cooled variable frequency converter is realized by the following steps:
an air-cooled variable frequency converter comprises a box body, wherein the inside of the box body is divided into a left cabin, a middle cabin and a right cabin, an auxiliary control system arranged in the left cabin, a variable frequency converter valve and a multi-winding transformer which are arranged in the middle cabin and distributed front and back, a station transformer arranged in the right cabin and a heat dissipation system used for dissipating heat in the box body are arranged in the box body;
each phase of the variable frequency converter valve comprises a plurality of cascade module units which are in a flattened design, the input side of each cascade module unit with the same phase is connected with the secondary coil of the multi-winding transformer with the same phase, and the output side of each cascade module unit with the same phase is sequentially connected in series from beginning to end through a connecting row.
Further, a mounting frame is provided at the front side of the intermediate compartment, and the cascade module units are fixed to the mounting frame in a stacked and spaced arrangement.
Further, the installation frame comprises two upper cross beams and two lower cross beams, a plurality of longitudinal beams are arranged between the upper cross beams and the lower cross beams which are opposite to each other, a plurality of fixed guide rails are arranged between the longitudinal beams which are opposite to each other, and the cascade module units are fixed on the two fixed guide rails which are opposite to each other left and right.
Further, the cascade module unit includes a housing, an electrical component mounted in the housing, and a power box board compartment mounted above the housing, an input side wiring row of the cascade module unit extends from a rear end of the housing, and an output side wiring row of the cascade module unit extends from a front end of the housing.
Further, the electrical component comprises a reactor and a voltage transformer which are arranged side by side with the input side wiring row, a current transformer positioned at the front side of the reactor, and an IGBT module and a direct current capacitor positioned at the front side inside the shell;
the reactor and the current transformer are connected in series on one input side wiring row, the voltage transformer is connected in parallel on the two input side wiring rows, and the IGBT module is connected with the direct current capacitor through the laminated busbar.
Further, a bypass switch connected in parallel with the inverter side of the cascade module unit is provided at the front side of the housing.
Further, a radiator positioned below the IGBT module is arranged in the shell;
the rear side of the cascade module unit is provided with an insulating sealing plate, a window opposite to the air outlet of the radiator is formed in the insulating sealing plate, and the air inlet of the radiator is exposed from the front side of the shell.
Further, a shutter heat dissipation hole is formed in the top plate of the power box board card cabin;
the louver radiating holes are of a convex structure.
Further, the heat dissipation system comprises an air duct which is communicated with the middle cabin and the left cabin and is communicated with the middle cabin and the right cabin, a centrifugal fan is arranged at the end part of the air duct, which is positioned at the middle cabin, and air conditioners are respectively arranged in the left cabin and the right cabin.
Further, the fans are respectively located above the rear side of the variable frequency converter valve and above two sides of the multi-winding transformer.
After the technical scheme is adopted, the invention has the following beneficial effects:
the frequency conversion converter valve adopts a flattened cascade module unit structure to form a modularized design, so that the whole structure of the converter valve is simpler and more compact, the occupied space is reduced, the convenience of subsequent maintenance and overhaul is improved, and the stability of the converter valve during operation is improved.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a front view of an air-cooled variable frequency converter according to a preferred embodiment of the present invention;
fig. 2 is a front view of an air-cooled inverter (without front hatch) according to a preferred embodiment of the invention;
fig. 3 is a rear view of an air-cooled inverter (rear door with no parts) according to a preferred embodiment of the present invention;
fig. 4 is a block diagram of an air-cooled inverter (not cased roof) according to a preferred embodiment of the present invention;
FIG. 5 is a top view of an air cooled inverter (without a top cabinet panel, air ducts and fans) in accordance with a preferred embodiment of the present invention;
fig. 6 is a front view of a converter valve of an air cooled converter according to a preferred embodiment of the present invention;
fig. 7 is a rear view of a converter valve of an air cooled variable frequency converter according to a preferred embodiment of the present invention;
fig. 8 is a left side view of a converter valve of an air cooled converter according to a preferred embodiment of the present invention;
fig. 9 is a block diagram of a converter valve (part) of an air-cooled converter according to a preferred embodiment of the present invention;
fig. 10 is a block diagram of a cascading module unit of an air-cooled variable frequency converter according to a preferred embodiment of the present invention;
fig. 11 is a top view of the internal structure (the layer of the IGBT module) of the cascade module unit of the air-cooled variable frequency converter according to the preferred embodiment of the present invention;
fig. 12 is a top view showing the internal structure (the level of the inner part of the power box board cabin) of the cascading module unit of the air-cooled variable frequency converter according to the preferred embodiment of the present invention;
fig. 13 is a structural view of a power box board deck plate of a cascading module unit of an air-cooled variable frequency converter according to a preferred embodiment of the present invention;
fig. 14 is a topology diagram of cascaded modular units of an air-cooled variable frequency converter according to a preferred embodiment of the present invention;
in the figure: the device comprises a box body 1, a left cabin 1-1, a middle cabin 1-2, a right cabin 1-3, a front cabin 1-4, a rear cabin 1-5, a left cabin 1-6, a right cabin 1-7, a multi-winding transformer 2, a variable frequency converter valve 3, a cascading module unit 3-1, a shell 3-11, an input side wiring row 3-12, an output side wiring row 3-13, a fuse 3-14, a reactor 3-15, a voltage transformer 3-16, a current transformer 3-17, an IGBT module 3-18, a laminated busbar 3-19, a direct current capacitor 3-110, a bypass switch 3-111, a radiator 3-112, a power box board card cabin 3-113, a shutter radiating hole 3-114, a board card 3-115, an optical fiber flange 3-116, a connecting row 3-2, an auxiliary control system 5, a radiating system 6, an air duct 6-1, a centrifugal fan 6-2, an air conditioner indoor unit 6-4, an installation frame 7, an upper beam 7-1, a lower beam 7-2, a lower beam 7-3-4, a fixed window sealing plate 8, a mounting frame 8 and an insulating sealing plate 8.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
As shown in fig. 1-14, an air-cooled variable frequency converter comprises a box body 1, wherein the inside of the box body is divided into a left cabin 1-1, a middle cabin 1-2 and a right cabin 1-3, an auxiliary control system 5 installed in the left cabin 1-1, a variable frequency converter valve 3 and a multi-winding transformer 2 which are installed in the middle cabin 1-2 and distributed back and forth, a station transformer 4 installed in the right cabin 1-3, and a heat dissipation system 6 for dissipating heat in the box body 1 are arranged in the box body 1; each phase of the variable frequency converter valve 3 comprises a plurality of cascade module units 3-1 which are in a flattened design, the input side of each cascade module unit 3-1 in phase is connected with the secondary side coil in phase of the multi-winding transformer 2, and the output side is sequentially connected in series end to end through a connecting row 3-2.
The variable frequency converter valve 3 comprises three phases and is arranged on the front side of the multi-winding transformer 2; the multi-winding transformer 2 includes three phases arranged side by side, and the secondary coil of each phase can be conveniently connected with the cascade module unit 3-1 of the corresponding phase. Preferably, the multi-winding transformer 2 is fixed to the rear of the intermediate compartment 1-2 by means of a mounting bracket 9.
In order to adapt to the height of the box body 1, each phase of cascading module units 3-1 are divided into two groups, namely, two parallel cascading module units 3-1 are arranged in parallel in a stacking interval mode, the cascading module units 3-1 positioned in the same row are connected in series end to end through a Z-shaped connecting row 3-2, and the two parallel cascading module units 3-1 are connected in series through a straight connecting row 3-2.
In addition, the front side of the middle cabin 1-2 is provided with a front cabin door 1-4, so that the frequency conversion converter valve 3 can be conveniently overhauled and maintained; the rear cabin door 1-5 is arranged at the rear side of the middle cabin 1-2, so that the multi-winding transformer 2 is convenient to maintain and overhaul.
The front side of the left cabin 1-1 is provided with a left cabin door 1-6, so that the auxiliary control system 5 in the left cabin 1-1 is convenient to overhaul and maintain; the front side and the rear side of the right cabin 1-3 are respectively provided with a right cabin door 1-7, so that the station transformer 4 in the right cabin 1-3 can be overhauled and maintained conveniently.
In order to achieve the installation of the cascade module units 3-1, the front side of the intermediate compartment 1-2 is provided with an installation frame 7, and the cascade module units 3-1 are fixed to the installation frame 7 in a stacked, spaced arrangement.
The variable frequency converter valve 3 adopts a modularized design, so that the compactness of the structure of the variable frequency converter valve can be improved, leakage inductance is reduced, the expandability is high, the safety margin is large, and the requirement of a high-voltage high-capacity variable frequency converter is met.
Specifically, the mounting frame 7 includes two upper cross beams 7-1 and two lower cross beams 7-2, a plurality of longitudinal beams 7-3 are arranged between the upper cross beams 7-1 and the lower cross beams 7-2 which are opposite to each other up and down, a plurality of fixed guide rails 7-4 are arranged between the longitudinal beams 7-3 which are opposite to each other front and back, and the cascade module unit 3-1 is fixed on the two fixed guide rails 7-4 which are opposite to each other left and right.
The existing variable frequency converter valve 3 adopts a supporting insulator to meet insulation requirements, the cost is higher, in the method, the upper cross beam 7-1, the lower cross beam 7-2 and the longitudinal beam 7-3 all adopt H-shaped all-insulation sectional materials, the requirement of the high-voltage high-capacity variable frequency converter is met, and the cost is lower.
Preferably, only umbrella skirts are arranged in the grooves of the upper cross beam 7-1, the lower cross beam 7-2 and the longitudinal beam 7-3 so as to increase the creepage distance and the insulation level.
In order to facilitate connection of the cascade module unit 3-1, the cascade module unit 3-1 includes a housing 3-11, electrical components mounted in the housing 3-11, and a power box board deck 3-113 mounted above the housing 3-11, an input-side wiring row 3-12 of the cascade module unit 3-1 protrudes from a rear end of the housing 3-11, and an output-side wiring row 3-13 of the cascade module unit 3-1 protrudes from a front end of the housing 3-11.
The input-side wiring rows 3-12 are connected with the secondary windings of the multi-winding transformer 2, and the output-side wiring rows 3-13 of the same phase are connected in series end to end through the connection rows 3-2.
Preferably, the fuse 3-14 is connected in series to the input-side wiring line 3-12, which protects the circuit of the cascade module unit 3-1.
The valve module of the existing variable frequency converter valve 3 comprises electronic elements such as a thyristor, a damping capacitor, a voltage-sharing capacitor, damping electroplating, a voltage-sharing resistor, reactors 3-15, a thyristor control unit and the like, and the thyristor is installed in a crimping way, so that the valve module is quite complex in structure and high in assembly and maintenance difficulty.
In the present invention, the electrical component includes a reactor 3-15 and a voltage transformer 3-16 arranged side by side with an input-side wiring block 3-12, a current transformer 3-17 located on the front side of the reactor 3-15, and an IGBT module 3-18 and a direct current capacitor 3-110 located on the inner front side of a case 3-11.
The invention forms redundancy design through the arrangement of the plurality of cascade module units 3-1, not only simplifies the structure of the whole cascade module unit 3-1, but also can normally work other cascade module units 3-1 when the individual cascade module unit 3-1 fails, reduces the failure probability of the variable frequency converter valve 3 and improves the reliability thereof.
The reactor 3-15 and the current transformer 3-17 are connected in series on one side of the input side wiring row 3-12, the voltage transformer 3-16 is connected in parallel on the two input side wiring rows 3-12, the IGBT module 3-18 is connected with the direct current capacitor 3-110 through the laminated busbar 3-19, and the input side wiring rows 3-12 are respectively connected in series with a fuse wire 3-14 (fuse wire) protection circuit.
The series reactor 3-15 is used for reducing harmonic waves of the cascading module unit 3-1, and the IGBT module 3-18 is connected with the direct current capacitor 3-110 through the laminated busbar 3-19, so that inductance can be reduced, circuit connection is more compact, and the integration degree of the cascading module unit 3-1 is higher.
Preferably, the direct current capacitors 3-110 are thin film capacitors which are used as energy storage elements, so that the service life is long, and maintenance work is greatly reduced.
Specifically, the cascade module unit 3-1 includes an active side on the input side that converts ac power into dc power and stores the dc power in the thin film capacitor, and an inverter side on the output side that converts dc power into ac power and sends the ac power to the grid side.
The direct current capacitors 3-110 are connected in parallel between the active H bridge and the inversion H bridge of the IGBT modules 3-18, the active H bridge of the IGBT modules 3-18 is arranged on the front side of the inversion H bridge of the cascaded module unit 3-1, the IGBT modules 3-18 and the direct current capacitors 3-110 are arranged side by side, and the stacked busbar 3-19 is arranged between the active H bridge and the inversion H bridge.
The front side of the housing 3-11 is provided with a bypass switch 3-111 connected in parallel with the inverter side of the cascade module unit 3-1.
The bypass switch 3-11 can bypass the failed cascading module unit 3-1 when the single cascading module unit 3-1 fails, so that the operation of other cascading module units 3-1 is not affected, and the uninterrupted operation of the system is realized.
The bypass switch 3-111 is a mechanical bypass switch 3-111, so that the rapid detection of the faults of the cascade module unit 3-1 can be realized, and the faults can be rapidly positioned and rapidly isolated.
The IGBT modules 3-18 generate heat during operation, and in order to achieve efficient heat dissipation to the IGBT modules 3-18, a heat sink 3-112 located below the IGBT modules 3-18 is installed in the housing 3-11.
The upper surface of the radiator 3-112 is of a planar structure, so that the installation and heat dissipation of the IGBT module 3-18 can be facilitated.
In order to ensure the heat dissipation effect, the rear side of the cascade module unit 3-1 is provided with an insulating sealing plate 8, a window 8-1 opposite to the air outlet of the radiator 3-112 is formed in the insulating sealing plate 8, and the air inlet of the radiator 3-112 is exposed from the front side of the housing 3-11.
The insulating sealing plate 8 is arranged on the mounting frame 7 and is fixed between two adjacent longitudinal beams 7-3, so that the whole variable frequency converter valve 3 is positioned in a single cabin, cold air enters from an air inlet at the front side of the radiator 3-112 and is discharged from an air outlet through a window 8-1 of the insulating sealing plate 8, a rapid linear heat dissipation channel is formed, and efficient heat dissipation of the interior of the cascade module unit 3-1 is ensured.
In order to ensure heat dissipation of devices in the power box board card cabin 3-113, louver heat dissipation holes 3-114 are formed in the top plate of the power box board card cabin 3-113.
The power box board card cabin 3-113 is internally provided with a board card 3-115, such as a driving power board card and a power supply board card, so as to control the circuit of the whole cascading module unit 3-1, and the shutter heat dissipation holes 3-114 are arranged, so that heat dissipation of the two board cards can be effectively ensured.
Preferably, the top plate of the power box board card cabin 3-113 is made of metal, the shutter radiating holes 3-114 are of a protruding structure, water and dust are prevented from falling into the power box board card cabin 3-113, and the electromagnetic shielding performance of the board card is guaranteed while heat dissipation, water resistance and dust resistance of the board card are effectively guaranteed.
Preferably, the optical fiber flange 3-116 is also arranged in the shell 3-11, so that the cascade module unit 3-1 can communicate with the outside, and the equipotential interference prevention and the dustproof and waterproof functions of the optical fiber and the shell 3-11 are also considered.
The existing frequency conversion converter adopts an air cooling heat dissipation mode, namely, the louver is installed around the box body 1, equipment is cooled through air flowing inside and outside the box body 1, but the heat dissipation effect is poor, louver filter cotton needs to be frequently replaced due to the fact that the engineering site environment is moist, high temperature and dirty, condensation is extremely easy to occur in the box, and equipment failure and shutdown can be caused due to the fact that the equipment is too high in temperature, water inflow and the like.
In the invention, different heat dissipation modes are adopted, wherein in order to realize efficient heat dissipation of the multi-winding transformer 2 and the variable frequency converter valve 3, the heat dissipation system 6 comprises an air duct 6-1 which is communicated with the middle cabin 1-2 and the left cabin 1-1 and is communicated with the middle cabin 1-2 and the right cabin 1-3, a centrifugal fan 6-2 is arranged at the end part of the air duct 6-1, which is positioned in the middle cabin 1-2, and air conditioners are respectively arranged in the left cabin 1-1 and the right cabin 1-3.
The air conditioner comprises an air conditioner indoor unit 6-3 positioned in the left cabin 1-1 and the right cabin 1-3 and an air conditioner outdoor unit 6-4 arranged outside the left cabin 1-1 and the right cabin 1-3 and connected with the air conditioner indoor unit 6-3 in the corresponding cabin so as to realize heat dissipation of the corresponding cabins, namely the left cabin 1-1 and the right cabin 1-3.
When the variable frequency converter works, heat generated by the multi-winding transformer 2 and the variable frequency converter valve 3 can be respectively sent into the left cabin 1-1 and the right cabin 1-3 through the centrifugal fan 6-2 and the air duct 6-1, and then the heat is dissipated to the outside of the box body 1 through an air conditioner.
In order to ensure the heat radiation effect, the centrifugal fans 6-2 are respectively positioned above the rear side of the variable frequency converter valve 3 and above the two sides of the multi-winding transformer 2.
In the middle cabin 1-2, the whole variable frequency converter valve 3 is positioned in a closed space due to the arrangement of the insulating sealing plate 8, wherein the centrifugal fan 6-2 positioned at the top of the middle cabin 1-2 at the rear side of the insulating sealing plate 8 is used for exhausting air to enable the space where the variable frequency converter valve 3 is positioned to form a negative pressure state, so that heat of the cascade module unit 3-1 is taken away, and simultaneously, the heat generated by the multi-winding transformer 2 is synchronously pumped into the left cabin 1-1 or the right cabin 1-3 by combining with the centrifugal fan 6-2 positioned above two sides of the multi-winding transformer 2, and then the heat is discharged by an air conditioner to realize heat dissipation and temperature reduction of the whole variable frequency converter valve 3.
In the process, the high-efficiency heat dissipation of the frequency conversion converter can be ensured, and the situation of dust accumulation and condensation on equipment in the box body 1 can not occur, so that the normal operation of the frequency conversion converter is effectively ensured.
In addition, the auxiliary control system 5 includes, but is not limited to, a manual alarm device, a smoke alarm, a temperature controller, a gas fire extinguisher, a lighting device, an emergency lighting device, an entrance guard, a travel switch, and an infrared video probe capable of measuring and monitoring temperature.
In the three phases of the winding transformer 2, each phase comprises a primary coil and M multiplied by N secondary coils, the input side of each cascading module unit 3-13-1 is connected with a secondary coil, the output sides of the cascading module units 3-13-1 are sequentially connected in series from head to tail, and then the cascading module units are connected with the reactors 3-153-15 in series to serve as the output end of the variable frequency converter. The phase shift between the secondary windings of the multi-winding transformer 22 is performed to reduce the harmonic content of the input side, and each converter valve adopts redundancy design in order to improve the running reliability of equipment, wherein M, N is more than or equal to 2, and X is an integer more than or equal to 1.
The variable frequency converter valve 3 adopted by the invention has simple and compact integral structure, good stability and convenient maintenance and overhaul, the frequency of the output end of the variable frequency converter in which the variable frequency converter valve is positioned is continuously adjustable from 0-10kHz, the amplitude is continuously adjustable from 0-MxVc, vc is the output voltage of each cascading module unit 3-13-1, the testing environment of low-frequency alternating current, power frequency alternating current and direct current can be provided for power equipment with different voltage levels, meanwhile, the variable frequency converter valve has the intervention capability of different voltage levels, and the variable frequency converter valve can be applied to the testing of equipment such as low-frequency transformers, low-frequency circuit breakers, low-frequency sea cables, STATCOM, APF, energy storage PCS, photovoltaic inverters, fan inverters, flexible direct current converters, direct current transformers, direct current circuit breakers and the like, and has wide application scenes.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. An air-cooled variable frequency converter is characterized by comprising a box body (1) with the inside divided into a left cabin (1-1), a middle cabin (1-2) and a right cabin (1-3), wherein an auxiliary control system (5) installed in the left cabin (1-1), a variable frequency converter valve (3) and a multi-winding transformer (2) which are installed in the middle cabin (1-2) and distributed front and back, a station transformer installed in the right cabin (1-3) and a heat dissipation system (6) for dissipating heat in the box body (1) are arranged in the box body (1);
each phase of the variable frequency converter valve (3) comprises a plurality of cascade module units (3-1) which are in a flattened design, the input side of each cascade module unit (3-1) with the same phase is connected with the secondary coil of the multi-winding transformer (2) with the same phase, and the output side is sequentially connected in series end to end through a connecting row (3-2).
2. An air-cooled variable frequency converter according to claim 1, characterized in that the front side of the intermediate compartment (1-2) is provided with a mounting frame (7), and that the cascade module units (3-1) are fixed to the mounting frame (7) in a stacked, spaced arrangement.
3. An air-cooled variable frequency converter according to claim 2, characterized in that the mounting frame (7) comprises two upper cross beams (7-1) and two lower cross beams (7-2), a plurality of longitudinal beams (7-3) are arranged between the upper cross beams (7-1) and the lower cross beams (7-2) which are opposite to each other, a plurality of fixed guide rails (7-4) are arranged between the longitudinal beams (7-3) which are opposite to each other front and back, and the cascading module unit (3-1) is fixed on the two fixed guide rails (7-4) which are opposite to each other left and right.
4. An air-cooled variable frequency converter according to claim 1, characterized in that the cascade module unit (3-1) comprises a housing (3-11), electrical components mounted in the housing (3-11), and a power box board compartment (3-113) mounted above the housing (3-11), the input side wiring row (3-12) of the cascade module unit (3-1) protruding from the rear end of the housing (3-11), the output side wiring row (3-13) of the cascade module unit (3-1) protruding from the front end of the housing (3-11).
5. An air-cooled variable frequency converter according to claim 4, characterized in that the electrical components comprise a reactor (3-15) and a voltage transformer (3-16) arranged side by side with the input side line bank (3-12), a current transformer (3-17) located on the front side of the reactor (3-15), and an IGBT module (3-18) and a dc capacitor (3-110) located on the inner front side of the housing (3-11);
the reactor (3-15) and the current transformer (3-17) are connected in series on one input side wiring row (3-12), the voltage transformer (3-16) is connected in parallel on the two input side wiring rows (3-12), and the IGBT module (3-18) is connected with the direct current capacitor (3-110) through the laminated busbar (3-19).
6. An air-cooled variable frequency converter according to claim 5, characterized in that the front side of the housing (3-11) is provided with a bypass switch (3-11) connected in parallel with the inverter side of the cascade module unit (3-1).
7. An air-cooled variable frequency converter according to claim 5, characterized in that a radiator (3-12) located below the IGBT module (3-18) is mounted in the housing (3-11);
the rear side of the cascade module unit (3-1) is provided with an insulating sealing plate (8), the insulating sealing plate (8) is provided with a window (8-1) opposite to an air outlet of the radiator (3-12), and an air inlet of the radiator (3-12) is exposed from the front side of the shell (3-11).
8. The air-cooled variable frequency converter according to claim 5, wherein louver heat dissipation holes (3-114) are arranged on the top plate of the power box board deck (3-113);
the louver radiating holes (3-114) are of a convex structure.
9. An air-cooled variable frequency converter according to claim 1, characterized in that the heat dissipation system (6) comprises an air duct (6-1) communicating the middle cabin (1-2) with the left cabin (1-1) and the middle cabin (1-2) with the right cabin (1-3), the air duct (6-1) being provided with a centrifugal fan (6-2) at the end of the middle cabin (1-2), and air conditioners being provided in the left cabin (1-1) and the right cabin (1-3) respectively.
10. An air-cooled variable frequency converter according to claim 9, characterized in that the centrifugal fans (6-2) are located above the rear side of the variable frequency converter valve (3) and above both sides of the multi-winding transformer (2), respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211555322.3A CN117767769A (en) | 2022-12-06 | 2022-12-06 | Air-cooled variable-frequency converter |
| PCT/CN2023/108353 WO2024119836A1 (en) | 2022-12-06 | 2023-07-20 | Air-cooling variable-frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211555322.3A CN117767769A (en) | 2022-12-06 | 2022-12-06 | Air-cooled variable-frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117767769A true CN117767769A (en) | 2024-03-26 |
Family
ID=90313211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211555322.3A Pending CN117767769A (en) | 2022-12-06 | 2022-12-06 | Air-cooled variable-frequency converter |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117767769A (en) |
| WO (1) | WO2024119836A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201608630U (en) * | 2009-12-24 | 2010-10-13 | 卧龙电气集团股份有限公司 | Economical structure modularized power unit used for high-voltage inverter |
| CN105897003A (en) * | 2016-01-18 | 2016-08-24 | 江苏耐维思通科技股份有限公司 | Power distribution container for shore power supply |
| CN206559215U (en) * | 2017-02-24 | 2017-10-13 | 东方日立(成都)电控设备有限公司 | A kind of constructional device for tandem type high-voltage high-power converter |
| ES1197362Y (en) * | 2017-10-05 | 2018-02-01 | Jaen Alejandro Izquierdo | TRANSPORTABLE AND MODULAR HABITACLE |
| CN207720033U (en) * | 2017-11-10 | 2018-08-10 | 中冶赛迪电气技术有限公司 | A kind of air-cooled rectifying power supply apparatus |
-
2022
- 2022-12-06 CN CN202211555322.3A patent/CN117767769A/en active Pending
-
2023
- 2023-07-20 WO PCT/CN2023/108353 patent/WO2024119836A1/en unknown
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| Publication number | Publication date |
|---|---|
| WO2024119836A1 (en) | 2024-06-13 |
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