CN111555593A - Power conversion unit and mining frequency converter - Google Patents
Power conversion unit and mining frequency converter Download PDFInfo
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- CN111555593A CN111555593A CN202010566978.XA CN202010566978A CN111555593A CN 111555593 A CN111555593 A CN 111555593A CN 202010566978 A CN202010566978 A CN 202010566978A CN 111555593 A CN111555593 A CN 111555593A
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- conversion unit
- power conversion
- direct current
- bus system
- plug
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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
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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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20927—Liquid coolant without phase change
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- Microelectronics & Electronic Packaging (AREA)
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- Inverter Devices (AREA)
Abstract
The disclosure provides a power conversion unit and a mining frequency converter. The power conversion unit is arranged in a shell of a mining frequency converter and comprises a water cooling plate, an inverter, a first direct current bus system, a direct current capacitor bank, a second direct current bus system and a rectifier bridge, wherein the inverter, the first direct current bus system and the direct current capacitor bank are sequentially arranged on a first surface of the water cooling plate in a stacked mode, the second direct current bus system and the rectifier bridge are electrically connected to the second direct current bus system and are arranged on a second surface of the water cooling plate, the inverter and the direct current capacitor bank are electrically connected through the first direct current bus system, the first direct current bus system and the second direct current bus system are electrically connected, the power conversion unit further comprises a plug-in type connecting device, a plug part of the plug-in type connecting device is arranged on a first side surface of the water cooling plate, a socket part of the plug-in type connecting device is arranged on a rear. The power conversion unit can realize the quick installation and disassembly of a circuit system, improves the working efficiency and can meet the requirement of field maintenance of equipment.
Description
Technical Field
The disclosure relates to the field of frequency converters, in particular to a power conversion unit and a mining frequency converter.
Background
At present, a water cooling plate of a mining frequency converter is usually fixed on an explosion-proof shell as a part of a rear cover plate of the explosion-proof shell. All devices of a power conversion unit of the mining frequency converter are arranged on the inner side of the water cooling plate, namely inside the explosion-proof shell, and an input/output port of the power conversion unit is connected with a peripheral circuit through bolts. Because the power conversion unit is high in voltage and large in current of an external connection point, not only is enough electrical safety distance guaranteed, but also space limitation in the explosion-proof shell is considered, so that the structural design of the connection point is complex, and insulation treatment is difficult. The narrow space causes inconvenience in installation of workers in the explosion-proof shell, so that the production efficiency is low, and the failure rate is increased. Meanwhile, the bolt connection mode adopted by the connection point also increases the dismantling difficulty of the fault power conversion unit, and the fault equipment can be maintained after being lifted up, so that the fault shutdown time of the equipment is prolonged. However, for the loads continuously running in the underground, the fault and the downtime of the equipment have strict examination requirements, and the power conversion unit which is not easy to disassemble and assemble cannot meet the requirement of on-site maintenance of the equipment, which is sometimes not allowed for coal enterprises with continuous production.
Disclosure of Invention
The present disclosure is provided to solve the above-mentioned drawbacks in the background art. Therefore, a power conversion unit and a mining frequency converter need to be invented. The power conversion unit and the mining frequency converter can be used for rapidly mounting and dismounting a circuit system of the power conversion unit, improve the working efficiency and meet the requirement of on-site maintenance of equipment.
The first aspect of the disclosure provides a power conversion unit, which is suitable for a mining frequency converter, the power conversion unit is installed in a housing of the mining frequency converter, and includes a water-cooling plate, an inverter, a first direct-current bus system and a direct-current capacitor bank which are sequentially stacked on a first surface of the water-cooling plate, a second direct-current bus system and a rectifier bridge electrically connected to the second direct-current bus system, the inverter and the direct-current capacitor bank are electrically connected through the first direct-current bus system, the first direct-current bus system is electrically connected to the second direct-current bus system, the power conversion unit further includes a plug-in type connection device, a plug part of the plug-in type connection device is arranged on a first side surface of the water-cooling plate, a socket part of the plug-in type connection device is arranged on a rear plate of the housing, the plug-in type connecting device realizes the connection and disconnection of the power conversion unit and a peripheral circuit through the matching of the plug part and the socket part, and the second side surface and the third side surface of the water cooling plate, which are adjacent to the first side surface, are respectively provided with a slide way, so that the power conversion unit can slide relative to the shell.
In some embodiments, the plug portion comprises an insulating base, an inner pair of cables or copper bars fastened to the insulating base by bolts, and a plug having a bottom pressed against the inner pair of cables or copper bars and fixed to the insulating base; the socket part comprises an insulating base, an external cable and an insertion pipe, wherein the external cable is fastened on the insulating base through bolts, and the bottom of the insertion pipe is pressed on the external cable and fixed on the insulating base.
In some embodiments, the plug is a red copper cylinder and the cannula is a red copper cylinder tube that matches the shape of the plug.
In some embodiments, the plug portion is a six-pole plug structure corresponding to a three-phase input and a three-phase output of the power conversion unit, respectively, wherein the pair of inner cables or copper bars corresponding to the three-phase input of the power conversion unit are electrically connected to the rectifier bridge; the pair of inner cables or copper bars corresponding to the three-phase output of the power conversion unit are electrically connected to the inverter.
In some embodiments, the first dc bus system includes a laminated bus bar and a first copper bar, the laminated bus bar is connected to the dc capacitor bank, one end of the first copper bar is connected to the laminated bus bar, and the other end is connected to the positive and negative ends of the inverter; the second direct current bus system comprises a second copper bar, the positive end and the negative end of the rectifier bridge are connected to the second copper bar, and the first direct current bus system is connected with the second direct current bus system through a cable.
In some embodiments, the laminated busbar includes a positive busbar, an insulating layer, and a negative busbar, the dc capacitor bank includes a plurality of capacitors, the positive busbar and the negative busbar respectively correspond to positive electrodes and negative electrodes of the capacitors, and feet of the capacitors are inversely mounted on the mounting plate through bolts.
In some embodiments, the power conversion unit further includes a filter resistor and a filter capacitor disposed on the second surface of the water cooling plate, the filter resistor is connected to the filter capacitor, and the filter capacitor is connected to the output end of the inverter to filter the ac voltage output by the inverter. In some embodiments, the rectifier bridge includes three sets of diode modules, and the power conversion unit further includes a thyristor disposed on the second surface of the water-cooled plate, a charging resistor electrically connected to the thyristor to charge the dc capacitor set, and a discharging resistor electrically connected to the first dc bus system to discharge the dc capacitor set.
In some embodiments, a water inlet and a water outlet are respectively disposed at left and right sides of the plug portion on the first side of the water cooling plate, and circular holes through which the water inlet and the water outlet can pass are respectively disposed at positions corresponding to the water inlet and the water outlet on the rear plate.
A second aspect of the disclosure provides a mining frequency converter comprising a power conversion unit as described in any of the above.
According to the power conversion unit provided by each scheme and the embodiment of the disclosure, each device is separately arranged on two surfaces of the water cooling plate, so that the heat dissipation area of the water cooling plate is fully utilized, the overall heat exchange efficiency is improved, and the performance of the device is improved. And each device is stacked and connected through the direct current busbar system to form a modular power conversion unit, so that the structure is simplified, the space is saved, the structure is more compact and reasonable, and compared with the original bolt or cable connection mode, the fault occurrence rate is reduced. The input and output ports of the power conversion unit are connected with the peripheral circuit through a plug-in type connecting device, and the plug-in type connecting device can realize quick connection and quick disconnection of the power conversion unit and the peripheral circuit through the matching of the plug part and the socket part. Meanwhile, the matching of the slide rail and the upper rail of the shell can lead the power conversion unit to freely slide in the shell along the direction vertical to the back plate of the shell, thus leading workers not to need to enter the back part of the shell and disassemble bolts, only pushing or pulling out the modularized power conversion unit along the rail and leading the plug part to be inserted into or pulled out from the socket part, and being capable of easily and quickly completing the assembly and disassembly of the power conversion unit without dragging heavy devices, greatly facilitating the assembly and disassembly and improving the working efficiency. When a fault occurs, the modularized power conversion unit can be integrally dismantled and then lifted up for maintenance, and meanwhile, the power conversion unit which is completely replaced can continue to work, so that the fault shutdown time is effectively shortened, the workload of field maintenance is reduced, and the requirement of field maintenance of equipment is met.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments generally by way of example and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 illustrates a first view of a power conversion unit provided according to an embodiment of the present disclosure;
fig. 2 illustrates a second view of a power conversion unit provided according to an embodiment of the present disclosure;
fig. 3 is a third view of a power conversion unit provided according to an embodiment of the present disclosure;
fig. 4 shows a main circuit diagram of a mining flameproof and intrinsically safe frequency converter according to an embodiment of the disclosure.
Detailed Description
For a better understanding of the technical aspects of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings. Embodiments of the present disclosure are described in further detail below with reference to the figures and the detailed description, but the present disclosure is not limited thereto.
The use of the word "comprising" or "comprises" and the like in this disclosure means that the elements listed before the word encompass the elements listed after the word and do not exclude the possibility that other elements may also be encompassed. The technical term "unit" used in the present disclosure is intended to mean a corresponding one of an analog circuit, a digital circuit, and a program module that implements a corresponding function, in which form it is adopted depending on an application scenario of the "unit" and a corresponding function to be implemented.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
The embodiment of the disclosure provides a power conversion unit, which is suitable for a mining frequency converter, such as a mining explosion-proof and intrinsically safe frequency converter. The power conversion unit may be installed in a housing of a mining frequency converter, as shown in fig. 1 to 3, the power conversion unit includes a water-cooled plate 3, an inverter 5, a first dc bus system 9 and a dc capacitor bank 2 sequentially stacked on a first surface of the water-cooled plate 3, and a second dc bus system (not shown) and a rectifier bridge 10 electrically connected to the second dc bus system on a second surface of the water-cooled plate 3. The inverter 5 and the dc capacitor bank 2 may be electrically connected by a first dc bus system 9, and the first dc bus system 9 and a second dc bus system are electrically connected.
Here, the water cooling plate 3 may be provided therein with a water cooling channel for transferring heat generated by the power conversion unit during operation to a peripheral heat exchange device through water for cooling, so as to achieve the purpose of heat dissipation.
The second side 15 and the third side 16 of the water-cooling plate 3 adjacent to the first side 14 can be respectively provided with a slide way 4, so that the power conversion unit can slide relative to the casing through the cooperation of the slide way 4 and a slide way (not shown) on the casing.
The water-cooled panel 3 may be placed horizontally or similar above the floor of the housing, the first surface of the water-cooled panel 3 may represent the upper surface of the water-cooled panel 3 in such a placement condition, and the second surface of the water-cooled panel 3 may represent the lower surface of the water-cooled panel 3 in such a placement condition. The inverter 5 on the upper surface of the water cooling plate 3 is electrically connected with the direct current capacitor bank 2 through a first direct current bus system 9 on the upper surface, and the rectifier bridge 10 on the lower surface of the water cooling plate 3 is connected with a second direct current bus system on the lower surface, that is, each device on the upper surface and each device on the lower surface of the water cooling plate 3 are firstly connected to the corresponding direct current bus system, and then the devices are connected through the electrical connection of the two direct current bus systems on the upper surface and the lower surface.
The power conversion unit further comprises a plug-in connection device comprising a plug part 7 and a socket part 8, wherein the plug part 7 may be arranged at a first side 14 of the water-cooled panel 3, which first side 14 may be the side of the water-cooled panel 3 opposite to the back panel 1 of the housing; the socket part 8 can be arranged on the back plate 1 of the shell, and a circuit connected with the peripheral circuit can be arranged in the back plate 1, so that the plug-in type connecting device can realize the connection and disconnection of the power conversion unit and the peripheral circuit through the matching of the plug part 7 and the socket part 8.
The plug part of the plug-in connection can be understood as an input/output interface of the power converter unit, the input of which is electrically connected to the rectifier bridge 10 and the output of which is electrically connected to the inverter 5. Thus, the input end can receive alternating voltage provided by an external power supply. After the ac voltage is input to the rectifier bridge 10 from the input end, the rectifier bridge 10 converts the ac voltage into a dc voltage, and the dc voltage is transmitted to the inverter 5 through the second dc bus system, the dc capacitor bank 2 and the first dc bus system 9, and then the inverter 5 can convert the dc voltage into an ac voltage with a certain frequency and transmit the ac voltage to a peripheral device, such as a motor, through the output end of the input/output interface, so that the peripheral device provides the ac voltage with the frequency to other devices.
Specifically, the rectifier bridge 10 may include a diode module for converting an ac voltage into a dc voltage. The dc capacitor bank 2 can be used to store electric energy to maintain the stability of the bus voltage of the power conversion unit. The inverter 5 may include an IGBT and a driving circuit thereof, and converts a direct-current voltage into an alternating-current voltage.
The power conversion unit provided by the embodiment of the disclosure makes full use of the heat dissipation area of the water cooling plate 3 by separately arranging each device on two surfaces of the water cooling plate 3, thereby improving the overall heat exchange efficiency and improving the performance of the device. And each device is stacked and connected through the direct current busbar system to form a modular power conversion unit, so that the structure is simplified, the space is saved, the structure is more compact and reasonable, and compared with the original bolt or cable connection mode, the fault occurrence rate is reduced. The input and output ports of the power conversion unit are connected with the peripheral circuit through a plug-in type connecting device, and the plug-in type connecting device can realize quick connection and quick disconnection of the power conversion unit and the peripheral circuit through the matching of the plug part 7 and the socket part 8. Meanwhile, the matching of the slide 4 and the upper rail of the shell can lead the power conversion unit to freely slide in the shell along the direction vertical to the back plate of the shell, thus leading workers to not need to enter the back part of the shell in the process of installation and disassembly, needing no dismounting bolts, only needing to push or pull out the modularized power conversion unit along the rail, and leading the plug part 7 to be inserted into or pulled out of the socket part 8, and being capable of easily and quickly completing the installation and the disassembly of the power conversion unit without dragging heavy devices, greatly facilitating the installation and the disassembly and improving the working efficiency. When a fault occurs, the modularized power conversion unit can be integrally dismantled and then lifted up for maintenance, and meanwhile, the power conversion unit which is completely replaced can continue to work, so that the fault shutdown time is effectively shortened, the workload of field maintenance is reduced, and the requirement of field maintenance of equipment is met.
In some embodiments, the plug portion 7 may include an insulating base, an internal cable or copper busbar, and a plug. The inner cable or copper bar can be fastened on the insulating base by a bolt, and the bottom of the plug is pressed on the inner cable or copper bar and fixed on the insulating base. The socket portion 8 may include an insulating base, an external cable, and a cannula. The external cable can be fastened on the insulating base through a bolt, the bottom of the insertion pipe is pressed on the external cable and fixed on the insulating base, and then the electric connection can be achieved through the insertion of the plug part 7 and the socket part 8.
In some embodiments, plug portion 7 may be a hexapole plug structure, corresponding to the three phase input and three phase output of the power conversion unit, respectively. Wherein, the input end of the input/output port corresponds to the three-phase input of the power conversion unit, which can be electrically connected to the rectifier bridge 10 through an internal cable or copper bar (the copper bar can be used as an input copper bar for receiving external input power), so that the external input power is transmitted to the rectifier bridge 10 through the input copper bar to perform rectification processing on the input voltage; the output terminals among the input and output ports correspond to three-phase outputs of the power conversion unit, and the pairs thereof may be connected to the inverter 5 through an internal cable or copper bar (which may serve as an output copper bar that outputs energy to the outside), so that the ac voltage processed by the inverter 5 is transmitted to peripheral devices via the output copper bar.
In some embodiments, the plug may be a red copper cylinder, and the cannula may be a cylindrical tube matching the shape of the plug, which may also be red copper. The socket part 8 in this embodiment is of a tubular structure protruding out of the insulating base of the rear plate 1, so that the thickness of the rear plate 1 or the insulating base is not limited by the structure of the socket part 8, i.e. the thickness of the socket part 8 and the plug part 7 is not too large because the part is designed inside the rear plate 1 or the insulating base. In some embodiments, the inner portion of the insertion tube may further include a structure that allows the plug to contact more closely when the plug is inserted into the insertion tube, for example, a spring structure that is disposed around the inner wall of the insertion tube, so as to improve the current transmission performance of the plug-in connector.
In other embodiments, the plug portion 7 and the socket portion 8 of the plug-in type connection device may also adopt other structures, for example, the plug portion 7 adopts a structure similar to a "female plug", and the socket portion 8 adopts a structure similar to a "male plug" (for example, a jack structure embedded in the insulating base), as long as the quick connection and disconnection can be realized through the plugging of the plug portion 7 and the socket portion 8.
In some embodiments, the first dc busbar system 9 may comprise a laminated busbar and a first copper busbar. The laminated busbar can be connected to the direct current capacitor bank 2, one end of the first copper bar can be connected to the laminated busbar, and the other end of the first copper bar can be connected to the positive end and the negative end of the inverter 5, so that the direct current capacitor bank 2 is electrically connected to the inverter 5 through the laminated busbar and the first copper bar.
In some embodiments, the laminated busbar includes a positive busbar, an insulating layer and a negative busbar arranged in a stacked manner, wherein the positive busbar and the negative busbar may be thin copper plates, and the insulating layer may include a plurality of layers of insulating paper, for example, three layers. The dc capacitor bank 2 may include a plurality of capacitors, and the positive busbar and the negative busbar of the laminated busbar may respectively correspond to the positive electrode and the negative electrode of the plurality of capacitors, so that the dc capacitor bank 2 is connected to the laminated busbar. The power conversion unit in the embodiment adopts a cable-free laminated busbar structure, so that the impedance of the power conversion unit and the distributed inductance in a line can be reduced, and the turn-off spike voltage of the IGBT is effectively reduced. Meanwhile, the laminated busbar can be integrally detached and installed, so that the quality control of the busbar is facilitated, and the disassembly and after-sale service are facilitated.
The ends of the capacitors opposite to the positive and negative electrodes may include feet, as shown in fig. 1-2, which may be fastened to the mounting plate 11 by bolts to allow the dc capacitor assembly 2 to be inverted in the housing.
In some embodiments, the second dc bus bar system (not shown) located on the lower surface of the water-cooled plate 3 may include a second copper bar to which the positive and negative ends of the rectifier bridge 10 may be connected. Because the second copper bar is electrically connected with the first direct current bus system, the rectifier bridge 10 can be electrically connected with the direct current capacitor bank 2 and the inverter 5 through the connection of the rectifier bridge 10 and the second copper bar and the connection of the first direct current bus system and the direct current capacitor bank 2 and the inverter 5.
In some embodiments, the first dc bus system and the second dc bus system may be electrically connected through a cable, that is, the electrical connection between the devices on the upper surface and the lower surface of the water cooling plate 3 may be realized through the second dc bus on the lower surface of the water cooling plate 3, the first dc bus on the upper surface of the water cooling plate 3, and the cable therebetween.
In some embodiments, as shown in fig. 3, the power conversion unit may further include a filter resistor 17 and a filter capacitor (not shown) disposed on the second surface of the water cooling plate 3, and the filter resistor 17 may be connected to the filter capacitor, and connected to the output end of the inverter 5 by the filter capacitor to filter the ac voltage output by the inverter 5. Specifically, the filter resistor 17 and the filter capacitor may be provided in plural sets, for example, three or more sets. For example, when the output of the inverter 5 is a three-phase output, three sets of filter resistors 17 and filter capacitors corresponding to the three-phase output may be provided, one end of each resistor in each set may be electrically connected together, and the other end of each resistor is connected to the corresponding filter capacitor, and then the filter capacitors are respectively connected to one end of the three-phase output of the inverter 5, specifically, connected to the output copper bar corresponding to the output end through a thin wire.
In some embodiments, as shown in FIG. 3, the rectifier bridge 10 may include three sets of diode modules. The power conversion unit may further include one thyristor disposed at the second surface of the water-cooled plate 3, a charging resistor R1, and a discharging resistor R2. Specifically, the charging resistor R1 may be electrically connected to the thyristor through a thin wire to charge the dc capacitor group 2, and the discharging resistor R2 is electrically connected to the laminated busbar to discharge the dc capacitor group 2, so as to ensure the personal safety of the maintenance personnel. For example, the discharge resistor R2 may be connected to the second busbar system through a thin wire, and the second busbar system is electrically connected to the laminated busbar, so that the discharge resistor R2 is electrically connected to the laminated busbar on the upper surface of the water-cooling plate 3.
In some embodiments, as shown in fig. 1 and 3, the water inlet and outlet 6 may be disposed on the left and right sides of the plug portion 7 on the first side 14 of the water-cooling plate 3, and two circular holes 12 may be disposed on the rear plate 1 corresponding to the positions of the water inlet and outlet 6, and the circular holes 12 may allow the water inlet and outlet 6 to pass through the rear plate 1, so as to facilitate installation of corresponding water pipes to be connected to the external circulation water-cooling system, thereby taking away heat inside the power conversion unit.
The embodiment of the present disclosure further provides a mining frequency converter, which includes any one of the power conversion units and a controller, where the controller may be respectively connected to the rectifier 10, the dc capacitor bank 2, the inverter 5, and the filter resistor 17 in the power conversion unit, so as to control operations of the rectifier 10, the dc capacitor bank 2, the inverter 5, and the filter resistor 17. The controller may be disposed on the water-cooling plate 3 to form a part of the modular power conversion unit, or may be separately disposed at other positions in the housing, which is not particularly limited by the present disclosure.
Fig. 4 shows a main circuit diagram of a mining flameproof and intrinsically safe frequency converter according to an embodiment of the disclosure. As shown in fig. 4, the main circuit adopts a topological structure, and includes a rectifier bridge 10 and an inverter 5, the rectifier bridge 10 adopts uncontrolled rectification, a dc capacitor bank 2 for energy storage is connected between the rectifier bridge 10 and the inverter 5, the inverter 5 adopts a two-level inversion electrical topological structure, and the two-level topology of the inverter 5 is the electrical topological structure of a conventional frequency converter. Of course, the two levels here are only an example of the present disclosure, and the technical solution of the present disclosure may also adopt other topologies, such as PWM rectification, three levels, etc., which is not limited by the present disclosure. The output end of the inverter 5 is connected with a filter resistor 17 (comprising resistors R3, R4 and R5) and a filter capacitor, so that the alternating voltage output by the inverter 5 can be filtered, and the influence of harmonic voltage and instantaneous impulse voltage on peripheral equipment can be obviously reduced. Meanwhile, the frequency converter charges and discharges the direct current capacitor bank 2 through the charging resistor R1 and the discharging resistor R2 respectively, so that the stability of a circuit system and the personal safety of maintenance personnel are guaranteed. In addition, the frequency converter is compact in structure and small in size, the whole size of the frequency converter is superior to that of products of the same type, and the problems that a conventional frequency converter is inconvenient to disassemble and maintain in a coal mine with a relatively narrow space due to large size and complex structure are solved.
Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the disclosure with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the specification or during the prosecution of the disclosure, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the foregoing detailed description, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (10)
1. A power conversion unit is suitable for a mining frequency converter and is characterized in that the power conversion unit is installed in a shell of the mining frequency converter and comprises a water cooling plate, an inverter, a first direct current bus system, a direct current capacitor bank, a second direct current bus system and a rectifier bridge, wherein the inverter, the first direct current bus system and the direct current capacitor bank are sequentially arranged on a first surface of the water cooling plate in a stacked mode, the second direct current bus system is arranged on a second surface of the water cooling plate in a stacked mode, the rectifier bridge is electrically connected to the second direct current bus system, the inverter and the direct current capacitor bank are electrically connected through the first direct current bus system, the first direct current bus system is electrically connected with the second direct current bus system, the power conversion unit further comprises a plug-in type connecting device, a plug part of the plug-in type connecting device is arranged on a first side surface of the water cooling plate, a socket part of the plug-in type connecting, the plug-in type connecting device realizes the connection and disconnection of the power conversion unit and a peripheral circuit through the matching of the plug part and the socket part, and the second side surface and the third side surface of the water cooling plate, which are adjacent to the first side surface, are respectively provided with a slide way, so that the power conversion unit can slide relative to the shell.
2. The power conversion unit according to claim 1, wherein the plug portion includes an insulating base, an inner pair of cables or copper bars fastened to the insulating base by bolts, and a plug having a bottom pressed against the inner pair of cables or copper bars and fixed to the insulating base; the socket part comprises an insulating base, an external cable and an insertion pipe, wherein the external cable is fastened on the insulating base through bolts, and the bottom of the insertion pipe is pressed on the external cable and fixed on the insulating base.
3. The power conversion unit of claim 2, wherein the plug is a red copper cylinder and the insertion tube is a red copper cylinder tube that matches the shape of the plug.
4. The power conversion unit according to claim 2, wherein the plug portion is a six-pole plug structure corresponding to a three-phase input and a three-phase output of the power conversion unit, respectively, wherein the pair of inner cables or copper bars corresponding to the three-phase input of the power conversion unit are electrically connected to the rectifier bridge; the pair of inner cables or copper bars corresponding to the three-phase output of the power conversion unit are electrically connected to the inverter.
5. The power conversion unit according to claim 1, wherein the first dc bus system comprises a laminated bus bar and a first copper bar, the laminated bus bar is connected to the dc capacitor bank, one end of the first copper bar is connected to the laminated bus bar, and the other end of the first copper bar is connected to positive and negative ends of the inverter; the second direct current bus system comprises a second copper bar, the positive end and the negative end of the rectifier bridge are connected to the second copper bar, and the first direct current bus system is connected with the second direct current bus system through a cable.
6. The power conversion unit according to claim 5, wherein the laminated busbar comprises a positive busbar, an insulating layer and a negative busbar which are arranged in a laminated manner, the direct-current capacitor bank comprises a plurality of capacitors, the positive busbar and the negative busbar respectively correspond to positive electrodes and negative electrodes of the capacitors, and feet of the capacitors are inversely arranged on the mounting plate through bolts.
7. The power conversion unit of claim 1, further comprising a filter resistor and a filter capacitor disposed on the second surface of the water-cooling plate, wherein the filter resistor is connected to the filter capacitor, and the filter capacitor is connected to the output end of the inverter to filter the ac voltage output by the inverter.
8. The power conversion unit of claim 1, wherein the rectifier bridge comprises three sets of diode modules, the power conversion unit further comprising a thyristor disposed on the second surface of the water-cooled plate, a charging resistor electrically connected to the thyristor to charge the dc capacitor set, and a discharging resistor electrically connected to the first dc bus system to discharge the dc capacitor set.
9. The power conversion unit according to claim 1, wherein a water inlet and a water outlet are provided on the left and right sides of the plug portion on the first side surface of the water-cooling plate, respectively, and circular holes through which the water inlet and the water outlet can pass are provided on the rear plate at positions corresponding to the water inlet and the water outlet, respectively.
10. A mining frequency converter, characterized by comprising a power conversion unit according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010566978.XA CN111555593A (en) | 2020-06-19 | 2020-06-19 | Power conversion unit and mining frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010566978.XA CN111555593A (en) | 2020-06-19 | 2020-06-19 | Power conversion unit and mining frequency converter |
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| CN111555593A true CN111555593A (en) | 2020-08-18 |
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| CN202010566978.XA Pending CN111555593A (en) | 2020-06-19 | 2020-06-19 | Power conversion unit and mining frequency converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112311298A (en) * | 2020-10-14 | 2021-02-02 | 青岛中加特电气股份有限公司 | Frequency conversion cabinet |
| CN113765334A (en) * | 2021-08-30 | 2021-12-07 | 新风光电子科技股份有限公司 | Indoor high-voltage high-power water-cooled frequency converter power unit |
| CN117792122A (en) * | 2024-02-23 | 2024-03-29 | 中宏科创新能源科技(浙江)有限公司 | Current conversion assembly, energy storage current transformer and energy storage system |
-
2020
- 2020-06-19 CN CN202010566978.XA patent/CN111555593A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112311298A (en) * | 2020-10-14 | 2021-02-02 | 青岛中加特电气股份有限公司 | Frequency conversion cabinet |
| CN113765334A (en) * | 2021-08-30 | 2021-12-07 | 新风光电子科技股份有限公司 | Indoor high-voltage high-power water-cooled frequency converter power unit |
| CN113765334B (en) * | 2021-08-30 | 2023-07-25 | 新风光电子科技股份有限公司 | Indoor high-voltage high-power water-cooling frequency converter power unit |
| CN117792122A (en) * | 2024-02-23 | 2024-03-29 | 中宏科创新能源科技(浙江)有限公司 | Current conversion assembly, energy storage current transformer and energy storage system |
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Address after: 100039 1401, 14th floor, building 1, yard 16, West Fourth Ring Middle Road, Haidian District, Beijing Applicant after: Guoneng Longyuan Electric Co.,Ltd. Applicant after: BAODING LONGYUAN ELECTRIC Co.,Ltd. Address before: 100039 17th floor, building 1, yard 16, West Fourth Ring Middle Road, Haidian District, Beijing Applicant before: GUODIAN LONGYUAN ELECTRICAL Co.,Ltd. Applicant before: BAODING LONGYUAN ELECTRIC Co.,Ltd. |
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Inventor after: Liu Xiaopeng Inventor after: Hou Linan Inventor after: Liang Yi Inventor after: Li Yan Inventor after: He Liang Inventor after: Zhu Feng Inventor after: Cao Han Inventor after: Luo Xiongfei Inventor after: Zhang Junjie Inventor after: Su Zhekan Inventor after: Lv Yuan Inventor before: Liu Xiaopeng Inventor before: Hou Linan Inventor before: Liang Yi Inventor before: Li Yan Inventor before: He Liang Inventor before: Zhu Feng Inventor before: Cao Han Inventor before: Luo Xiongfei Inventor before: Zhang Junjie Inventor before: Su Zhekan Inventor before: Lv Yuan |