CN214544127U - High-power frequency converter power cabinet with series voltage structure - Google Patents
High-power frequency converter power cabinet with series voltage structure Download PDFInfo
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- CN214544127U CN214544127U CN202120817366.3U CN202120817366U CN214544127U CN 214544127 U CN214544127 U CN 214544127U CN 202120817366 U CN202120817366 U CN 202120817366U CN 214544127 U CN214544127 U CN 214544127U
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Abstract
The utility model relates to the technical field of power semiconductor application and current source type electric transmission, in particular to a high-power frequency converter power cabinet with a series voltage structure, which comprises a cabinet body, wherein a power bridge mounting rack, a main circuit copper busbar, an inlet and outlet wire busbar interface, and a full-control rectifying unit and a full-control inverting unit of the series voltage structure are arranged in the cabinet body; the top of the cabinet body is provided with a high-power cooling fan; the full-control rectification unit and the full-control inversion unit of the series-voltage structure are connected in series on a loop, are arranged on the power bridge mounting frame in parallel, and are connected through a main loop copper busbar to form a complete main loop; the fully-controlled rectifying unit comprises a fully-controlled power bridge module of a series-voltage structure, and the crimping form of the fully-controlled power bridge module is I-shaped series-voltage crimping. Through this power cabinet, can effectively solve installation space and require high and trouble, overhaul difficult problem.
Description
Technical Field
The utility model relates to a power semiconductor uses and electric drive technical field of current source type, especially relates to a high-power converter power cabinet of series voltage structure.
Background
The current source type high-power frequency converter (LCI) is widely applied to the soft start of a large-scale gas turbine unit, a pumped storage unit and a high-capacity phase modulation unit, and realizes the quick start and grid connection of a large-scale synchronous motor. The application principle of the method is mainly that alternating current-direct current-alternating current conversion of a power supply is realized through rectification and inversion of a thyristor full-control bridge, a power frequency alternating current power supply is converted into alternating current with adjustable frequency and is transmitted to the stator side of a synchronous motor, and the motor is dragged to a rated rotating speed or a self-sustaining rotating speed by matching with rotor excitation.
Due to the characteristics of high voltage, large current, high heat productivity and the like, the power unit of the high-power frequency converter needs to consider a plurality of factors such as insulation requirements, heat dissipation capacity and the like in structural design. The conventional design mode is mainly realized by expanding the size of a cabinet body or distributing power units in different cabinets, and the problems of high manufacturing cost, large installation size, high requirement on field installation space, difficulty in failure and maintenance and the like exist.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a high-power converter power cabinet of structure is pressed to cluster can effectively solve the problem that installation space requires highly and trouble, maintenance difficulty.
The utility model discloses a realize through adopting following technical scheme:
the utility model provides a high-power converter power cabinet of series voltage structure, includes the cabinet body, its characterized in that: a power bridge mounting rack, a main circuit copper busbar, an inlet and outlet wire busbar interface, a fully-controlled rectifying unit of a series-voltage structure and a fully-controlled inverter unit are arranged in the cabinet body; the top of the cabinet body is provided with a high-power cooling fan; the full-control rectification unit and the full-control inversion unit of the series-voltage structure are connected in series on a loop, are arranged on the power bridge mounting frame in parallel, and are connected through a main loop copper busbar to form a complete main loop; the fully-controlled rectifying unit comprises a fully-controlled power bridge module of a series-voltage structure, and the crimping form of the fully-controlled power bridge module is I-shaped series-voltage crimping.
The fully-controlled power bridge module of the series-compression structure comprises a compression joint bolt, a disc spring, a compression joint screw rod, an upper insulating column, an upper supporting steel cushion block, a flexible connection copper bar, a thyristor radiator module, a lower supporting steel cushion block and a lower insulating column; the thyristor radiator module comprises an aluminum radiator, a high-power thyristor and a positioning pin.
The cabinet body is divided into a front chamber and a rear chamber, the front chamber forms an independent closed space through structural design, and the whole independent closed space forms a cooling air channel loop which takes a thyristor radiator blade gap as an air inlet channel and takes a cooling fan air outlet as an air outlet channel; the rear chamber is used as an air inlet channel of the front chamber and is communicated with the external environment.
The full-control rectification unit further comprises a resistance-capacitance protector, a pulse amplifier, an insulation mounting assembly and a bridge stack positioning assembly.
The end part of the flexible connection copper bar in the full-control power bridge module is enlarged.
The I-shaped full-control power bridge module is positioned by positioning holes of the thyristor and the radiator, positioning pins arranged between the positioning holes and insulating mounting assemblies arranged in front of and behind the radiator.
Each high-power thyristor is provided with an independent resistance-capacitance protector and an independent pulse amplifier, and a pulse trigger loop signal is electrically triggered by adopting optical transmission.
The fully-controlled rectification unit side wire inlet interface and the fully-controlled inversion unit side wire outlet interface are symmetrically arranged in the cabinet and are respectively arranged on the right side and the left side of the rear chamber of the cabinet body; the positive end of a direct current bus of the full-control rectification unit is connected with the input side of an external reactor, and the output side of the reactor is connected with the negative end of a bus of the full-control inversion unit to form a complete power loop.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses in, through the structural design of "I" font power bridge module, install two high-power rectifier bridges in the cabinet of a power cabinet is internal, arrange through the copper and realized that the major loop reliably connects and reserve the major loop external tapping, compact structure, power density and space utilization height. Meanwhile, the power bridge module is in a modular design, and is convenient to disassemble, assemble and maintain.
2. The utility model discloses a forced air cooling's cooling method, the operation is reliable, maintain simply, divide into two independent spaces with the power cabinet, through water conservancy diversion and the restraint to the wind channel wind direction to and the accurate calculation of wind speed, realize the rational design in wind channel, solved this a big difficult problem of heat dissipation on heavy current, high voltage power structural design, improved the suitability of device, expanded the applied scene of device.
3. The utility model adopts the reliable and economic thyristor as the main power element, the technology is mature, and the performance is reliable; the pulse trigger of the thyristor adopts optical transmission electric trigger, and the transmission reliability is high.
4. The end area of the flexible connection copper bar in the full-control power bridge module is enlarged, so that the whole bridge is stable and fully contacted with a radiator.
5. The I-shaped full-control power bridge module is positioned by positioning holes of the thyristor and the radiator, positioning pins arranged between the positioning holes and insulating mounting assemblies used for positioning in the front and at the back of the radiator, and when the accurate assembly and positioning of the whole full-control power bridge module are realized, fixing pressure is applied to the whole module through the adjustable bolt, the belleville spring, the crimping screw and other assemblies on the upper part of the full-control power bridge module, so that the reliable crimping and fixing of the whole module are ensured.
6. The utility model discloses in, the parallelly connected a set of resistance-capacitance absorber in thyristor rectifier both ends is connected through radiator side screw hole for restrain peak voltage, protection thyristor. The capacitor is horizontally arranged on the insulating mounting plates of the frames at the two sides of the module, and the capacitor is isolated from the power unit by adopting an insulating plate; the resistor is arranged on the side wall insulating plate, and the installation position of the resistor is over against the air inlet of the air duct so as to realize good heat dissipation of the resistor; the independent pulse amplifier is used for pulse amplification and isolation of the thyristor, and the transmission mode of the pulse adopts optical transmission electric triggering, so that the reliability of the device is improved.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
fig. 1 is a schematic electrical diagram of the present invention;
FIG. 2 is an external view of the present invention;
fig. 3 is a layout diagram of the inside of the cabinet of the present invention;
fig. 4 is a front view of the middle power bridge module of the present invention;
fig. 5 is a left side view of the present invention;
FIG. 6 is a structural diagram of an I-shaped fully-controlled power bridge module of the present invention;
fig. 7 is a block diagram of the thyristor radiator of the present invention;
the labels in the figure are:
1. the system comprises a full-control power bridge module 2, a power bridge mounting frame 3, a thyristor radiator module 4, a front chamber 5, a rear chamber 6, a resistance-capacitance protector 7, a pulse amplifier 8, an incoming busbar interface 9 and an outgoing busbar interface; 10. and (5) cooling the fan.
Detailed Description
Example 1
As the utility model discloses basic embodiment, the utility model discloses a high-power converter power cabinet of string pressure structure, the intelligent cabinet temperature adjusting device comprises a cabinet body, the internal power bridge mounting bracket 2, main loop copper bar, the female interface of arranging of business turn over line, full accuse rectifier unit and full accuse inverter unit of arranging of cabinet, wherein full accuse rectifier unit and full accuse inverter unit are the string pressure structure. The top of the cabinet body is provided with a high-power cooling fan 10. The full-control rectification unit and the full-control inversion unit of the series voltage structure form series connection on a loop and are arranged on the power bridge mounting rack 2 in parallel, wherein the rectification side inlet wire interface and the inversion side outlet wire interface are symmetrically arranged in the cabinet and are respectively arranged on the right side and the left side of the cabinet rear chamber 5. The input end of the full-control rectification unit is connected with the output end of the full-control inversion unit through a copper busbar, the output end of the full-control rectification unit is connected with the input end of an external smoothing reactor through a copper busbar, and the input end of the full-control inversion unit is connected with the output end of the smoothing reactor through a copper busbar to form a complete frequency converter main loop.
The full-control rectifier bridge comprises a full-control power bridge module 1 with a serial voltage structure, a resistance-capacitance protector 6, a pulse amplifier 7, an insulation mounting assembly and a bridge stack positioning assembly. The crimping form of the fully-controlled power bridge module 1 of the series-compression structure is I-shaped series-compression crimping, and comprises a crimping bolt, a disc spring, a crimping screw, an upper insulating column, an upper supporting steel cushion block, a special flexible connection copper bar, a radiator, a high-power thyristor, a lower supporting steel cushion block and a lower insulating column. Wherein the I-shaped serial pressure welding specifically refers to: each power component of the full-control power bridge module 1 is vertically laminated to form a structure.
The utility model discloses can be used to high-power converter electrical drive field, as transmission equipment's power unit. The pulse current source type high-power frequency converter can be used as a power unit of a 6-6 pulse current source type high-power frequency converter, and can also be used as a rectifying unit of a 12 pulse frequency converter AC-DC rectifier.
Example 2
As a preferred embodiment of the present invention, the present invention includes a high-power frequency converter power cabinet with a series-compression structure, which comprises a cabinet body. The power bridge installation rack 2, the main circuit copper busbar, the incoming and outgoing line busbar interface 9, and the full-control rectifying unit and the full-control inverting unit of the series-voltage structure are arranged in the cabinet body. The whole cabinet body is divided into a front chamber 4 and a rear chamber 5, and the front chamber 4 structurally forms an independent closed space with the outside except an air inlet and outlet channel. The air inlet and outlet channel comprises an air inlet channel formed by the gaps of the blades of the thyristor radiator and an air outlet channel formed by the air outlet of the fan. The rear chamber 5 is used as an air inlet channel of the air duct and an installation space of the copper busbar and is communicated with the external environment in space. The cooling mode of the power cabinet adopts forced air cooling, a high-power centrifugal cooling fan 10 is arranged and is arranged at the top of the front chamber 4 of the cabinet body to form a stable and efficient upper air draft cooling structure, and after the fan normally operates, a stable negative pressure environment is formed in the space.
The fully-controlled rectifier unit side incoming line interface and the fully-controlled inverter unit side outgoing line interface are symmetrically arranged in the cabinet and are respectively arranged on the right side and the left side of a rear cabinet body 5, the fully-controlled rectifier unit and the fully-controlled inverter unit of the series voltage structure form series connection on a loop and are mounted on the power bridge mounting rack 2 in parallel, the direct current busbar positive end of the fully-controlled rectifier unit is connected with the input side of an external reactor, and the reactor output side is connected with the busbar negative end of the fully-controlled inverter unit to form a complete power loop. The fully-controlled rectifying unit comprises a fully-controlled power bridge module 1 of a series-voltage structure, and the crimping form of the fully-controlled power bridge module 1 is I-shaped series-voltage crimping.
Example 3
As the utility model discloses the best mode, the utility model discloses a high-power converter power cabinet of structure is pressed to cluster, the intelligent cabinet temperature adjusting device comprises a cabinet body. Referring to the attached figure 2 of the specification, the length, width and height of the cabinet body are 1000mm multiplied by 1100mm multiplied by 2200 mm. An air outlet is formed in the top of the cabinet body, and a high-power cooling fan 10 of the tool is installed at the air outlet. The cooling fan 10 is a 3KW high-power centrifugal fan, is arranged at the top of the cabinet body, is provided with an air draft cooling structure, and is provided with an independent tool cover shell connected with the top cover of the cabinet body and fixed by screws.
Referring to the attached drawing 1 of the specification, a power bridge mounting rack 2, a main circuit copper busbar, an inlet and outlet wire busbar interface, a fully-controlled rectifying unit with a series-voltage structure and a fully-controlled inverting unit are arranged in the cabinet body. The full-control rectification unit and the full-control inversion unit of the series voltage structure form series connection on a loop, are arranged on the power bridge mounting rack 2 in parallel, and are connected through the main loop copper busbar to form a complete main loop. The full-control rectification unit and the full-control inversion unit have the same structure, and comprise a full-control power bridge module 1 with a series-voltage structure, a resistance-capacitance protector 6 and a pulse amplifier 7, and the full-control rectification unit and the full-control inversion unit are connected through a copper busbar, a wire inlet busbar interface 8 and a wire outlet busbar interface 9 to form a complete main loop structure.
The power cabinet body is spatially divided into a front chamber 4 and a rear chamber 5, the front chamber 4 is composed of a front door plate, a full-control power bridge module 1, an upper top plate, a cooling fan 10 and a lower sealing plate, and a left sealing plate and a right sealing plate form an independent closed space; the whole space is formed by taking the gaps of the blades of the thyristor radiator as air inlet channels, the air outlet of the cooling fan 10 is taken as a cooling air channel loop of an air outlet channel, and after the cooling fan 10 normally operates, a stable negative pressure environment is formed in the front chamber 4, so that forced air cooling heat dissipation of the high-power frequency converter is realized. The rear chamber 5 is used as an air inlet channel of the front chamber 4 and also used as a circuit copper busbar mounting space for mounting a copper busbar in place, and the whole rear chamber 5 is communicated with the external environment.
Referring to the attached drawing 3 of the specification, the full-control power bridge module 1 of the series-compression structure comprises a compression joint bolt, a belleville spring, a compression joint screw, an upper insulating column, an upper supporting steel cushion block, a special copper bar flexible connection, a thyristor radiator module 3, a lower supporting steel cushion block and a lower insulating column. Referring to the attached fig. 7 of the specification, the thyristor radiator module 3 comprises an aluminum radiator, a high-power thyristor and a positioning pin. Referring to the attached figure 6 of the specification, the I-shaped fully-controlled power bridge module 1 is formed by series voltage. And the front surface of the full-control power bridge module 1 is provided with a sealing insulating part for restricting a cooling air channel. The flexible connection copper bar in the full-control power bridge module 1 is specially customized, and the stability of the whole bridge and the full contact with a radiator are achieved by enlarging the area of the end part of the copper bar.
The I-shaped full-control power bridge module 1 is characterized in that the accurate assembly and positioning of the whole module are realized through positioning holes of the thyristor and the radiator, positioning pins arranged between the positioning holes and insulation components used for positioning in the front and at the back of the radiator, and meanwhile, fixing pressure is applied to the whole module through components such as adjustable bolts, belleville springs and crimping screws on the upper portion of the module, so that reliable crimping and fixing of the whole module are guaranteed.
Referring to the attached figure 4 of the specification, two ends of the thyristor rectifier are connected with a group of resistance-capacitance absorbers in parallel and fixed through threaded holes in the side face of the radiator, and the resistance-capacitance absorbers are used for restraining peak voltage and protecting the thyristor. The capacitor is horizontally arranged on the insulating mounting plates of the frames at the two sides of the module, and the capacitor is isolated from the power unit by adopting an insulating plate; the resistor is arranged on the side wall insulating plate, and the installation position of the resistor is over against the air inlet of the air duct so as to realize good heat dissipation of the resistor; the independent pulse amplifier 7 is used for pulse amplification and isolation of the thyristor, and the transmission mode of the pulse adopts optical transmission electric triggering. The reliability of the device is improved.
The power bridge mounting rack 2 is formed by welding hot rolled steel and comprises a transverse mounting rack and a longitudinal mounting rack. The transverse mounting includes an upper transverse frame and a lower transverse frame. The upper transverse frame is provided with mounting and fixing holes, bridge pile compression joint threaded holes and threaded holes which are distributed in an equilateral triangle, and the triangle center of the upper transverse frame coincides with the center line of the module. The lower transverse frame is provided with a mounting fixing hole and a neutral point positioning hole. And an insulating part mounting hole is formed in the inner surface of the longitudinal frame, and the mounting frame and the power device are isolated by the insulating part so as to meet the insulating requirement of high voltage. And the front and the back of the insulating piece are provided with positioning insulating stop blocks for forward positioning of the bridge stack.
Referring to the attached drawing 5 of the specification, a main circuit copper busbar is connected with a flexible connection copper bar of a power bridge module to form a closed main circuit, a busbar output interface comprises a busbar incoming interface 8 connected to an input power transformer at the side of the rectifier bridge module, a busbar outgoing interface 9 for conveying rectified direct-current power to a smoothing reactor, and a busbar incoming interface 8 connected to the output end of a generator stator by an inverter bridge module, the copper busbar is fixedly installed on a cabinet body profile through an insulator, and the copper busbar is subjected to tinning treatment.
The protection action signals provided by the high-power frequency converter power cabinet with the series voltage structure comprise a fan operation signal, a fan exit signal, a pulse fault signal, an over-temperature alarm signal and a wind pressure relay action signal.
In conclusion, after the ordinary skilled in the art reads the document of the present invention, the technical solution and technical idea of the present invention do not need creative mental labor and make other various corresponding transformation schemes, which all belong to the protection scope of the present invention.
Claims (8)
1. The utility model provides a high-power converter power cabinet of series voltage structure, includes the cabinet body, its characterized in that: a power bridge mounting rack (2), a main circuit copper busbar, an inlet and outlet wire busbar interface, a fully-controlled rectifying unit of a series-voltage structure and a fully-controlled inverter unit are arranged in the cabinet body; the top of the cabinet body is provided with a high-power cooling fan (10); the full-control rectification unit and the full-control inversion unit of the series-voltage structure are connected in series on a loop, are arranged on the power bridge mounting rack (2) in parallel, and are connected through a main loop copper busbar to form a complete main loop; the fully-controlled rectifying unit comprises a fully-controlled power bridge module (1) of a series-voltage structure, and the crimping form of the fully-controlled power bridge module (1) is I-shaped series-voltage crimping.
2. The high-power frequency converter power cabinet with a series-voltage structure according to claim 1, characterized in that: the full-control power bridge module (1) of the series voltage structure comprises a crimping bolt, a disc spring, a crimping screw, an upper insulating column, an upper supporting steel cushion block, a flexible connection copper bar, a thyristor radiator module (3), a lower supporting steel cushion block and a lower insulating column, wherein the thyristor radiator module (3) comprises an aluminum radiator, a high-power thyristor and a positioning pin.
3. The power cabinet of a high-power frequency converter with a series-voltage structure as claimed in claim 2, wherein: the cabinet body is divided into a front chamber (4) and a rear chamber (5), the front chamber (4) forms an independent closed space through structural design, and the whole independent closed space forms a cooling air channel loop which takes a thyristor radiator blade gap as an air inlet channel and takes an air outlet of a cooling fan (10) as an air outlet channel; the rear chamber (5) is used as an air inlet channel of the front chamber (4) and is communicated with the external environment.
4. The power cabinet of high-power frequency converter in series-connected structure as claimed in claim 2 or 3, wherein: the full-control rectification unit further comprises a resistance-capacitance protector (6), a pulse amplifier (7), an insulation mounting assembly and a bridge stack positioning assembly.
5. The power cabinet of a high-power frequency converter with a series-voltage structure as claimed in claim 2, wherein: the end part of the flexible connection copper bar in the full-control power bridge module (1) is enlarged.
6. The high-power frequency converter power cabinet with a series-voltage structure as claimed in claim 4, wherein: the I-shaped full-control power bridge module (1) is positioned by positioning holes of the thyristor and the radiator, positioning pins arranged between the positioning holes and insulating mounting assemblies used for positioning in front of and behind the radiator.
7. The power cabinet of high-power frequency converter in series-connected voltage structure as claimed in claim 2 or 6, wherein: each high-power thyristor is provided with an independent resistance-capacitance protector (6) and a pulse amplifier (7), and a pulse trigger loop signal is electrically triggered by optical transmission.
8. The power cabinet of a high-power frequency converter with a series-voltage structure as claimed in claim 3, wherein: the fully-controlled rectification unit side wire inlet interface and the fully-controlled inversion unit side wire outlet interface are symmetrically arranged in the cabinet and are respectively arranged on the right side and the left side of the rear chamber (5) of the cabinet body; the positive end of a direct current bus of the full-control rectification unit is connected with the input side of an external reactor, and the output side of the reactor is connected with the negative end of a bus of the full-control inversion unit to form a complete power loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120817366.3U CN214544127U (en) | 2021-04-21 | 2021-04-21 | High-power frequency converter power cabinet with series voltage structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120817366.3U CN214544127U (en) | 2021-04-21 | 2021-04-21 | High-power frequency converter power cabinet with series voltage structure |
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| CN214544127U true CN214544127U (en) | 2021-10-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268249A (en) * | 2021-12-14 | 2022-04-01 | 大力电工襄阳股份有限公司 | High-voltage synchronous frequency conversion soft starting equipment and starting method thereof |
| CN118300428A (en) * | 2024-06-05 | 2024-07-05 | 湘潭市时代电气有限公司 | Mining rectifier cabinet |
| PL131370U1 (en) * | 2023-04-03 | 2024-10-07 | Triol-Poland Spółka Z Ograniczoną Odpowiedzialnością | Modular frequency-controlled electric drive platform |
-
2021
- 2021-04-21 CN CN202120817366.3U patent/CN214544127U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268249A (en) * | 2021-12-14 | 2022-04-01 | 大力电工襄阳股份有限公司 | High-voltage synchronous frequency conversion soft starting equipment and starting method thereof |
| PL131370U1 (en) * | 2023-04-03 | 2024-10-07 | Triol-Poland Spółka Z Ograniczoną Odpowiedzialnością | Modular frequency-controlled electric drive platform |
| CN118300428A (en) * | 2024-06-05 | 2024-07-05 | 湘潭市时代电气有限公司 | Mining rectifier cabinet |
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