Frequency converter device

Abstract

The utility model provides frequency converter equipment, and relates to the technical field of frequency converters. The frequency converter device comprises: a base; the at least one unit cabinet is arranged on the base, the unit cabinet comprises 3N first mounting cavities, each first mounting cavity is internally provided with a power group string, each power group string comprises at least two first power units which are connected in series, and N is a positive integer; and the control cabinet is arranged on the base, and the control cabinet is in communication connection with the unit cabinets. The modular arrangement of the unit cabinets is realized, so that new unit cabinets do not need to be independently designed and produced according to different grade requirements of the frequency converter equipment, the universality of the unit cabinets in the frequency converter equipment is improved, and the design cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of frequency converters, and in particular to a frequency converter device. Background Art

[0002] Among the related technologies, high-voltage variable frequency regulation technology has the characteristics of excellent speed regulation performance, complete protection function, significant energy-saving effect and easy automatic control system interface to realize automatic adjustment nodes, and has been widely used.

[0003] In order to meet different power requirements, the power unit cabinets of the inverter are divided into multiple levels, and each level of unit cabinet needs to be designed independently. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, the present application proposes a frequency converter device.

[0006] In view of this, the present application provides a frequency converter device, including: a base; at least one unit cabinet, the unit cabinet is arranged on the base, the unit cabinet includes 3N first installation cavities, each first installation cavity is provided with a power string, each power string includes at least two first power units connected in series, N is a positive integer; a control cabinet, the control cabinet is arranged on the base, and the control cabinet is communicatively connected with the unit cabinet.

[0007] In this technical solution, the frequency converter device includes a base, a unit cabinet and a control cabinet, wherein the unit cabinet and the control cabinet are both arranged on the base. 3N first installation cavities are arranged in the unit cabinet, and a power string is arranged in each first installation cavity, and the power string includes at least two first power units connected in series. The control cabinet is communicatively connected with the unit cabinet. Exemplarily, the control cabinet is provided with a terminal board, a control board and an interface board, which can monitor and control the frequency converter device, including the working status of each unit cabinet.

[0008] Exemplarily, the first power unit includes an IGBT (Insulated Gate Bipolar Transistor) and a rectifier bridge.

[0009] Among them, corresponding to three-phase electricity, each N first installation cavities among the 3N ones correspond to one of the three-phase electricity, that is, after the N power strings in the N first installation cavities are connected in series, they are connected to one phase of the three-phase electricity.

[0010] Exemplarily, N=1, that is, the unit cabinet includes three first installation cavities, and the power strings in each of the three first installation cavities are respectively connected to one phase of the three-phase electricity.

[0011] It can be understood that the number of first power units in the power string is related to the level of the unit cabinet. The number of unit cabinets can be one or more. By combining different numbers of unit cabinets, power unit cabinet groups of different levels can be obtained.

[0012] Exemplarily, when the number of unit cabinets is at least two, at least two unit cabinets may be unit cabinets of the same size or unit cabinets of different sizes, wherein the number of first power units in the first installation cavity of the unit cabinets of different sizes is different, that is, the levels of the unit cabinets of different sizes are different.

[0013] In the inverter device of the technical solution of the present application, the number of unit cabinets can be one or more. Different levels of unit cabinets can be combined through a plurality of unit cabinets, thereby realizing a modular setting of the unit cabinet. Therefore, there is no need to separately design and produce new unit cabinets according to the different levels of requirements of the inverter equipment, thereby improving the versatility of the unit cabinets in the inverter equipment and reducing the design cost.

[0014] In addition, the inverter device in the above technical solution provided by this application may also have the following additional technical features:

[0015] In some technical solutions of the present application, optionally, the number of unit cabinets is at least 2, and the at least 2 unit cabinets include an adjacent first unit cabinet and a second unit cabinet; the inverter device also includes: a first copper busbar, a first end of the first copper busbar is electrically connected to an output end of a power string in the first unit cabinet, and a second end of the first copper busbar is electrically connected to an input end of a power string in the second unit cabinet.

[0016] In this technical solution, when the number of unit cabinets in the inverter device is at least 2, it is assumed that among the at least 2 unit cabinets, there are two spatially adjacent unit cabinets, namely the first unit cabinet and the second unit cabinet. At this time, the first unit cabinet and the second unit cabinet are electrically connected through the first copper busbar.

[0017] Exemplarily, an opening for passing the first copper busbar is provided on the side wall of the unit cabinet, and the opening is provided at a position corresponding to each first installation cavity. Assuming N=3, that is, each unit cabinet includes 3 first installation cavities, 3 openings are provided on the side wall of the unit cabinet.

[0018] Exemplarily, assume that N=1, that is, each unit cabinet includes 3 first installation cavities. Taking the first installation cavity located at the top among the 3 first installation cavities as an example, a first group string is arranged in the first installation cavity located at the top of the first unit cabinet, and a second group string is arranged in the first installation cavity located at the top of the second unit cabinet. The output end of the first group string is electrically connected to the input end of the second group string through the first copper busbar, so that the first group string and the second group string are connected in series to form a complete power group string. At this time, assuming that the first group string includes 3 first power units connected in series, and assuming that the second group string includes 5 first power units connected in series, the final complete power group string includes 8 first power units connected in series, that is, an 89-level unit cabinet is obtained.

[0019] Similarly, if three first power units connected in series are provided in the first string group and the second string group, the final complete power string group includes six first power units connected in series, that is, a 67-level unit cabinet is obtained.

[0020] The technical solution of the present application connects two adjacent unit cabinets by setting a first copper busbar, so that a plurality of unit cabinets can be freely connected in series, thereby realizing a modular setting of the unit cabinets.

[0021] In some technical solutions of the present application, optionally, the unit cabinet includes a first unit cabinet and a second unit cabinet; the power string in the first unit cabinet includes at least 2 first power units; and the power string in the second unit cabinet includes at least 4 first power units.

[0022] In this technical solution, the number of first power units in each power string in the first unit cabinet is 2 or more, and the number of first power units in each power string in the second unit cabinet is 4 or more.

[0023] For example, the number of first power units in each power string in the first unit cabinet is 3, and the number of first power units in each power string in the second unit cabinet is 5. In this case, when one first unit cabinet is provided alone, 34 levels of unit cabinets can be realized, when one second unit cabinet is provided alone, 56 levels of unit cabinets can be realized, and when one first unit cabinet and one second unit cabinet are provided at the same time, 89 levels of unit cabinets can be realized.

[0024] The technical solution of the present application reasonably sets the number of first power units in the power string of the first unit cabinet and the second unit cabinet, so that the first unit cabinet and the second unit cabinet can be combined into a variety of unit cabinets of different levels, which can adapt to the actual needs of unit cabinets of different levels.

[0025] In some technical solutions of the present application, optionally, the unit cabinet also includes a second installation cavity, in which three second power units are arranged, and each of the three second power units is electrically connected to the N power strings.

[0026] In this technical solution, exemplarily, the second installation cavity is located at the top of the unit cabinet, and three second power units are arranged in the second installation cavity. The three second power units are respectively used to perform star-sealing processing on the power strings of the three-phase electricity.

[0027] Exemplarily, assume that N=1, that is, the unit cabinet includes 3 first installation cavities and 1 second installation cavity. At this time, the second installation cavity includes 3 second power units, and the input end of each power string in the 3 first installation cavities is connected to the second power unit for star sealing.

[0028] Exemplarily, when the frequency converter device includes a plurality of unit cabinets, the second power unit is arranged only in the last unit cabinet, that is, the star-sealing process is performed at the end of a plurality of power strings connected in series.

[0029] The technical solution of the present application performs star-sealing processing on each phase power string through the second power unit in the second installation cavity, which can reduce the difficulty of wiring.

[0030] In some technical solutions of the present application, optionally, the unit cabinet further includes: a second copper busbar, and two adjacent first power units in the power string are connected in series via the second copper busbar.

[0031] In this technical solution, the first power units in a power string are electrically connected through a second copper busbar, so that multiple first power units are connected in series. For example, assuming that a power string includes three first power units, which are respectively recorded as unit A, unit B and unit C, and unit A is adjacent to unit B in space, and unit B is adjacent to unit C in space, then unit A and unit B are electrically connected through a second copper busbar, and unit B and unit C are electrically connected through a second copper busbar.

[0032] The technical solution of the present application electrically connects multiple first power units through a second copper busbar, which can improve the connection stability of the power string and reduce the difficulty of assembly.

[0033] In some technical solutions of the present application, optionally, the unit cabinet also includes: a first cable, through which the 3N power strings are electrically connected; and a second cable, through which each power string is electrically connected to a second power unit.

[0034] In this technical solution, 3N power strings in the unit cabinet are electrically connected in sequence through a first cable, and the output end of each power string is connected to a second power unit through a second cable for star sealing.

[0035] For example, assume that N=1, that is, three first installation cavities are set in the unit cabinet, and three second power units are set in the second installation cavity. A power string is set in each first installation cavity, which are the first string, the second string and the third string from top to bottom. The first string is connected to the second string through a first cable, and the second string is connected to the third string through a first cable. At the same time, the output end of the first string is connected to the first second power unit through a second cable, the output end of the second string is connected to the second second power unit through a second cable, and the output end of the third string is connected to the third power unit through a second cable.

[0036] The technical solution of the present application connects different power strings by setting a first cable and a second cable, and seals the power strings. When there are different numbers of first power units in the power strings, reliable electrical connection can be achieved by adjusting the cable length, thereby improving the flexibility of the implementation of the solution.

[0037] In some technical solutions of the present application, optionally, the unit cabinet also includes: a current sensor, which is arranged on the second cable.

[0038] In this technical solution, the current sensor may be a Hall current sensor, which is arranged on the second cable to detect the output current of a single-phase power string. Exemplarily, one current sensor is arranged on each second cable.

[0039] Exemplarily, the output end of a phase power string is connected to a second cable, and the second cable is connected to a second power unit after passing through a current sensor and is closed.

[0040] The technical solution of the present application can effectively monitor the output current of each phase power string by setting a current sensor.

[0041] In some technical solutions of the present application, optionally, the unit cabinet also includes: 3N partitions, which are arranged in the unit cabinet at intervals, and the 3N partitions divide the cavity of the unit cabinet into a second installation cavity and 3N first installation cavities, and the partitions are provided with wire holes, and the first cable and the second cable are passed through the wire holes.

[0042] In this technical solution, the unit cabinet includes a cavity, and 3N partitions divide the cavity in the unit cabinet into a second installation cavity and 3N first installation cavities. Exemplarily, the 3N partitions can be evenly distributed in the unit cabinet along the height direction of the unit cabinet, so that the second installation cavity and each first installation cavity have the same height.

[0043] Exemplarily, the first power unit and the second power unit are both arranged on the partitions, that is, three second power units are arranged on the top partition, and at least two first power units are arranged on the remaining partitions.

[0044] The partition is also provided with a wire hole for passing the first cable and the second cable. Taking N=3, that is, including 3 first installation cavities as an example, from bottom to top, the power string in the lowest first installation cavity is connected to the first cable and the second cable, and the first cable passes through the wire hole of the upper partition and is electrically connected to the power string in the second first installation cavity from the bottom. The second cable passes through the wire hole of each partition in sequence and is electrically connected to a second power unit.

[0045] The technical solution of the present application divides the cavity space in the unit cabinet by setting a partition, so that the power string of each phase is independently set in an installation cavity, making the power units in the unit cabinet neatly and orderly distributed.

[0046] In some technical solutions of the present application, optionally, the inverter device further includes: a heat dissipation component, which is arranged on the top of the unit cabinet.

[0047] In this technical solution, a heat dissipation component is arranged on the top of the unit cabinet. Exemplarily, the heat dissipation component includes a shell, ventilation holes, a fan and a heat dissipation duct, wherein the heat dissipation duct connects the heat dissipation component and the internal cavity of the unit cabinet, and the fan can be an axial flow fan.

[0048] Exemplarily, a dustproof net may also be provided at the ventilation hole.

[0049] The technical solution of the present application dissipates heat for the power unit therein by arranging a heat dissipation component on the top of the unit cabinet, thereby preventing heat from accumulating in the unit cabinet and causing excessive temperature, thereby improving the safety of the unit cabinet.

[0050] In some technical solutions of the present application, optionally, the unit cabinet further includes: an aviation plug interface, which is arranged on a side wall of the unit cabinet and is electrically connected to the power string.

[0051] In this technical solution, the side wall of the unit cabinet is provided with an aviation plug interface, which is used to connect the transformer cabinet. Exemplarily, the side wall of the unit cabinet is also provided with a high-voltage wire hole, which is used for wiring between the transformer cabinet.

[0052] In some technical solutions of the present application, optionally, the control cabinet includes: a cabinet body; a door body, which is openably and closably arranged on the cabinet body; and a control panel, which is arranged on the door body.

[0053] In this technical solution, the control cabinet includes a cabinet body, a cavity is formed in the cabinet body, and a terminal board, a control board and an interface board are arranged in the cavity. The control cabinet also includes a door body, which is openably arranged on the cabinet body, and a control panel is arranged on the door body. The control panel is a human-machine interaction interface of the inverter control cabinet. The user can grasp the real-time working condition information of the inverter through the control panel and control the operation of the inverter.

[0054] Exemplarily, the control panel is a touch screen, which can display real-time operating data of the inverter control cabinet and the inverter body, and display fault information when a possible fault occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0056] Figure 1 A schematic diagram showing the structure of a frequency converter device in some embodiments of the present application is shown;

[0057] Figure 2 A schematic diagram showing the structure of a frequency converter device in some embodiments of the present application is shown;

[0058] Figure 3 A schematic structural diagram of a frequency converter device according to some embodiments of the present application is shown.

[0059] Reference numerals:

[0060] 10 inverter equipment, 12 base, 14 first copper bar;

[0061] 20 unit cabinet, 202 first installation cavity, 204 power string, 2042 first power unit, 206 second installation cavity, 208 second power unit, 210 second copper bus, 212 first cable, 214 second cable, 216 current sensor, 218 partition, 220 wire hole, 222 heat dissipation component, 224 aviation plug interface, 226 opening, 228 high-voltage wire hole, 22 first unit cabinet, 24 second unit cabinet;

[0062] 30 control cabinets, 32 cabinet bodies, 34 door bodies, 36 control panels. DETAILED DESCRIPTION

[0063] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0064] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0065] Refer to the following Figures 1 to 3 The following describes a frequency converter device 10 provided according to some embodiments of the present application.

[0066] In some embodiments of the present application, a frequency converter device 10 is provided. Figure 1 , Figure 2 and Figure 3 The structure diagram of the frequency converter device 10 of some embodiments of the present application is shown as follows: Figure 1 , Figure 2 and Figure 3 As shown, the inverter device 10 includes: a base 12; at least one unit cabinet 20, which is arranged on the base 12, and the unit cabinet 20 includes 3N first installation cavities 202, each of which is provided with a power string 204, and each power string 204 includes at least two first power units 2042 connected in series, N is a positive integer; a control cabinet 30, which is arranged on the base 12, and the control cabinet 30 is communicatively connected with the unit cabinet 20.

[0067] In this embodiment, the frequency converter device 10 includes a base 12, a unit cabinet 20 and a control cabinet 30, wherein the unit cabinet 20 and the control cabinet 30 are both arranged on the base 12. 3N first installation cavities 202 are arranged in the unit cabinet 20, and a power string 204 is arranged in each first installation cavity 202, and the power string 204 includes at least two first power units 2042 connected in series. The control cabinet 30 is communicatively connected with the unit cabinet 20. Exemplarily, the control cabinet 30 is provided with a terminal board, a control board and an interface board, which can monitor and control the frequency converter device, including the working status of each unit cabinet 20.

[0068] Exemplarily, the first power unit 2042 includes an IGBT (Insulated Gate Bipolar Transistor) and a rectifier bridge.

[0069] Among them, corresponding to three-phase electricity, each N first installation cavities 202 in the 3N ones respectively correspond to one of the three-phase electricity, that is, the N power strings 204 in the N first installation cavities 202 are connected in series and then connected to one phase of the three-phase electricity.

[0070] Exemplarily, N=1, that is, the unit cabinet 20 includes three first installation cavities 202, and the power string 204 in each of the three first installation cavities 202 is connected to one phase of the three-phase electricity.

[0071] It can be understood that the number of first power units 2042 in the power string 204 is related to the level of the unit cabinet 20. The number of unit cabinets 20 can be one or more. By combining different numbers of unit cabinets 20, power unit cabinet groups of different levels can be obtained.

[0072] Exemplarily, when the number of unit cabinets 20 is at least two, at least two unit cabinets 20 may be unit cabinets 20 of the same size or unit cabinets 20 of different sizes, wherein the number of first power units 2042 in the first installation cavity 202 of the unit cabinets 20 of different sizes is different, that is, the levels of the unit cabinets 20 of different sizes are different.

[0073] In the inverter device 10 of the embodiment of the present application, the number of unit cabinets 20 can be one or more. Through a plurality of unit cabinets 20, unit cabinets of different levels can be combined to achieve a modular setting of the unit cabinet 20. Therefore, there is no need to separately design and produce new unit cabinets 20 according to the different levels of requirements of the inverter device 10, thereby improving the versatility of the unit cabinets 20 in the inverter device 10 and reducing the design cost.

[0074] In some embodiments of the present application, optionally, the number of unit cabinets 20 is at least 2, and the at least 2 unit cabinets 20 include an adjacent first unit cabinet 22 and a second unit cabinet 24; the inverter device 10 also includes: a first copper busbar 14, a first end of the first copper busbar 14 is electrically connected to the output end of a power string 204 in the first unit cabinet 22, and a second end of the first copper busbar 14 is electrically connected to the input end of a power string 204 in the second unit cabinet 24.

[0075] In this embodiment, when the number of unit cabinets 20 in the inverter device 10 is at least 2, it is assumed that among the at least 2 unit cabinets 20, there are two unit cabinets 20 that are spatially adjacent, namely, a first unit cabinet 22 and a second unit cabinet 24. At this time, the first unit cabinet 22 and the second unit cabinet 24 are electrically connected through the first copper bus 14.

[0076] Exemplarily, an opening 226 for passing the first copper busbar 14 is provided on the side wall of the unit cabinet 20, and the setting position of the opening 226 corresponds to each first installation cavity 202. Assuming N=3, that is, each unit cabinet 20 includes 3 first installation cavities 202, then 3 openings 226 are provided on the side wall of the unit cabinet 20.

[0077] Exemplarily, assume that N=1, that is, each unit cabinet 20 includes three first installation cavities 202. Taking the first installation cavity 202 located at the top among the three first installation cavities 202 as an example, a first group string is arranged in the first installation cavity 202 located at the top of the first unit cabinet 22, and a second group string is arranged in the first installation cavity 202 located at the top of the second unit cabinet 24. The output end of the first group string is electrically connected to the input end of the second group string through the first copper bus 14, so that the first group string and the second group string are connected in series to form a complete power group string 204. At this time, assuming that the first group string includes three first power units 2042 connected in series, and assuming that the second group string includes five first power units 2042 connected in series, the final complete power group string 204 includes eight first power units 2042 connected in series, that is, an 89-level unit cabinet is obtained.

[0078] Similarly, if three first power units 2042 are connected in series in both the first string and the second string, the final complete power string 204 includes six first power units 2042 connected in series, that is, a 67-level unit cabinet is obtained.

[0079] In the embodiment of the present application, a first copper busbar 14 is provided to connect two adjacent unit cabinets 20 , so that a plurality of unit cabinets 20 can be freely connected in series, thereby realizing a modular setting of the unit cabinets 20 .

[0080] In some embodiments of the present application, optionally, the unit cabinet 20 includes a first unit cabinet 22 and a second unit cabinet 24; the power string 204 in the first unit cabinet 22 includes at least 2 first power units 2042; and the power string 204 in the second unit cabinet 24 includes at least 4 first power units 2042.

[0081] In this embodiment, the number of first power units 2042 in each power string 204 in the first unit cabinet 22 is 2 or more, and the number of first power units 2042 in each power string 204 in the second unit cabinet 24 is 4 or more.

[0082] For example, the number of first power units 2042 in each power string 204 in the first unit cabinet 22 is 3, and the number of first power units 2042 in each power string 204 in the second unit cabinet 24 is 5. At this time, when one first unit cabinet 22 is provided alone, 34 levels of unit cabinets 20 can be realized, when one second unit cabinet 24 is provided alone, 56 levels of unit cabinets 20 can be realized, and when one first unit cabinet 22 and one second unit cabinet 24 are provided at the same time, 89 levels of unit cabinets 20 can be realized.

[0083] The embodiment of the present application reasonably sets the number of first power units 2042 in the power string 204 of the first unit cabinet 22 and the second unit cabinet 24, so that the first unit cabinet 22 and the second unit cabinet 24 can be combined into a variety of different levels of unit cabinets 20, which can adapt to the actual needs of unit cabinets of different levels.

[0084] In some embodiments of the present application, optionally, the unit cabinet 20 further includes a second installation cavity 206 , in which three second power units 208 are disposed, and each of the three second power units 208 is electrically connected to the N power strings 204 .

[0085] In this embodiment, illustratively, the second installation cavity 206 is located at the top of the unit cabinet 20, and three second power units 208 are arranged in the second installation cavity 206. The three second power units 208 are respectively used to perform star-sealing processing on the power string 204 of the three-phase electricity.

[0086] Exemplarily, assume that N=1, that is, the unit cabinet 20 includes three first installation cavities 202 and one second installation cavity 206. At this time, the second installation cavity 206 includes three second power units 208, and the input end of each power string 204 in the three first installation cavities 202 is connected to the second power unit 208 for star sealing.

[0087] Exemplarily, when the frequency converter device 10 includes a plurality of unit cabinets 20 , the second power unit 208 is only provided in the last unit cabinet 20 , that is, the star-closing process is performed at the end of the plurality of power strings 204 connected in series.

[0088] In the embodiment of the present application, the second power unit 208 in the second installation cavity 206 performs star-sealing processing on each phase power string 204 , which can reduce the difficulty of wiring.

[0089] In some embodiments of the present application, optionally, the unit cabinet 20 further includes: a second copper busbar 210 , through which two adjacent first power units 2042 in the power string 204 are connected in series.

[0090] In this embodiment, the first power units 2042 in a power string 204 are electrically connected through the second copper busbar 210, so that multiple first power units 2042 are connected in series. For example, assuming that a power string 204 includes three first power units 2042, which are respectively recorded as unit A, unit B, and unit C, and unit A is adjacent to unit B in space, and unit B is adjacent to unit C in space, then unit A and unit B are electrically connected through a second copper busbar 210, and unit B and unit C are electrically connected through a second copper busbar 210.

[0091] In the embodiment of the present application, the plurality of first power units 2042 are electrically connected through the second copper busbar 210 , which can improve the connection stability of the power string 204 and reduce the difficulty of assembly.

[0092] In some embodiments of the present application, optionally, the unit cabinet 20 further includes: a first cable 212 , through which the 3N power strings 204 are electrically connected; and a second cable 214 , through which each power string 204 is electrically connected to a second power unit 208 .

[0093] In this embodiment, 3N power strings 204 in the unit cabinet 20 are electrically connected in sequence through a first cable 212 , and the output end of each power string 204 is connected to a second power unit 208 through a second cable 214 for star-sealing.

[0094] For example, it is assumed that N=1, that is, three first installation cavities 202 are set in the unit cabinet 20, and three second power units 208 are set in the second installation cavity 206. A power string 204 is set in each first installation cavity 202, which are the first string, the second string and the third string from top to bottom. The first string is connected to the second string through a first cable 212, and the second string is connected to the third string through a first cable 212. At the same time, the output end of the first string is connected to the first second power unit 208 through a second cable 214, the output end of the second string is connected to the second second power unit 208 through a second cable 214, and the output end of the third string is connected to the third power unit through a second cable 214.

[0095] In the embodiment of the present application, a first cable 212 and a second cable 214 are provided to connect different power strings 204 and to seal the power strings 204. When there are different numbers of first power units 2042 in the power strings 204, reliable electrical connection can be achieved by adjusting the cable length, thereby improving the flexibility of the implementation of the solution.

[0096] In some embodiments of the present application, optionally, the unit cabinet 20 further includes: a current sensor 216 , which is arranged on the second cable 214 .

[0097] In this embodiment, the current sensor 216 may be a Hall current sensor, which is disposed on the second cable 214 to detect the output current of the one-phase power string 204. Exemplarily, one current sensor 216 is disposed on each second cable 214.

[0098] Exemplarily, the output end of a single-phase power string 204 is connected to a second cable 214 , and the second cable 214 passes through a current sensor 216 and is connected to a second power unit 208 and is closed.

[0099] The embodiment of the present application can effectively monitor the output current of each phase power string 204 by providing a current sensor 216 .

[0100] In some embodiments of the present application, optionally, the unit cabinet 20 further includes: 3N partitions 218, the partitions 218 are spaced apart in the unit cabinet 20, the 3N partitions 218 divide the cavity of the unit cabinet 20 into a second installation cavity 206 and 3N first installation cavities 202, and a wire hole 220 is provided on the partition 218, and the first cable 212 and the second cable 214 are passed through the wire hole 220.

[0101] In this embodiment, the unit cabinet 20 includes a cavity, and 3N partitions 218 separate the cavity in the unit cabinet 20 into a second installation cavity 206 and 3N first installation cavities 202. Exemplarily, the 3N partitions 218 can be evenly distributed in the unit cabinet 20 along the height direction of the unit cabinet 20, so that the second installation cavity 206 and each first installation cavity 202 have the same height.

[0102] Exemplarily, the first power unit 2042 and the second power unit 208 are both arranged on the partition 218 , that is, three second power units 208 are arranged on the top partition 218 , and at least two first power units 2042 are arranged on the remaining partitions 218 .

[0103] The partition is also provided with a wire hole 220, which is used to pass the first cable 212 and the second cable 214. Taking N=3, that is, including 3 first installation cavities 202 as an example, from bottom to top, the power string 204 in the lowest first installation cavity 202 is connected to the first cable 212 and the second cable 214. The first cable 212 passes through the wire hole 220 of the upper partition 218 and is electrically connected to the power string 204 in the second first installation cavity 202 from the bottom. The second cable 214 passes through the wire hole 220 of each partition 218 in sequence and is electrically connected to a second power unit 208.

[0104] In the embodiment of the present application, a partition 218 is provided to separate the cavity space in the unit cabinet 20 , so that the power string 204 of each phase is independently provided in an installation cavity, and the power units in the unit cabinet 20 are distributed neatly and orderly.

[0105] In some embodiments of the present application, optionally, the inverter device 10 further includes: a heat dissipation component 222 , and the heat dissipation component 222 is disposed on the top of the unit cabinet 20 .

[0106] In this embodiment, a heat dissipation component 222 is provided on the top of the unit cabinet 20. Exemplarily, the heat dissipation component 222 includes a shell, ventilation holes, a fan and a heat dissipation duct, wherein the heat dissipation duct connects the heat dissipation component 222 and the internal cavity of the unit cabinet 20, and the fan can be an axial flow fan.

[0107] Exemplarily, a dustproof net may also be provided at the ventilation hole.

[0108] In the embodiment of the present application, a heat dissipation assembly 222 is disposed on the top of the unit cabinet 20 to dissipate heat for the power unit therein, thereby preventing heat from accumulating in the unit cabinet 20 and causing excessive temperature, thereby improving the safety of the unit cabinet 20 .

[0109] In some embodiments of the present application, optionally, the unit cabinet 20 further includes: an aviation plug interface 224 , which is disposed on a side wall of the unit cabinet 20 and is electrically connected to the power string 204 .

[0110] In this embodiment, the side wall of the unit cabinet 20 is provided with an aviation plug interface 224, which is used to connect the transformer cabinet. Exemplarily, the side wall of the unit cabinet 20 is also provided with a high-voltage wire hole 228, which is used for wiring between the transformer cabinet.

[0111] In some embodiments of the present application, optionally, the control cabinet 30 includes: a cabinet body 32 ; a door body 34 , which is openably disposed on the cabinet body 32 ; and a control panel 36 , which is disposed on the door body 34 .

[0112] In this embodiment, the control cabinet 30 includes a cabinet body 32, a cavity is formed in the cabinet body 32, and a terminal board, a control board, an interface board, etc. are arranged in the cavity. The control cabinet 30 also includes a door body 34, which is openably arranged on the cabinet body 32, and a control panel 36 is arranged on the door body 34. The control panel 36 is a human-computer interaction interface of the inverter control cabinet 30. The user can grasp the real-time working condition information of the inverter through the control panel 36 and control the operation of the inverter.

[0113] Exemplarily, the control panel 36 is a touch screen, and the control panel 36 can display the real-time operating data of the inverter control cabinet 30 and the inverter body, and display fault information when a possible fault occurs.

[0114] In the description of this application, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the terms "upper" and "lower" indicate positions or positional relationships based on the positions or positional relationships described in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. The terms "connect", "install", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0115] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0116] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A frequency converter device, characterized in that: include: Base; At least one unit cabinet, the unit cabinet is arranged on the base, the unit cabinet includes 3N first installation cavities, each of the first installation cavities is provided with a power string, each of the power strings includes at least two first power units connected in series, and N is a positive integer; A control cabinet is arranged on the base, and the control cabinet is communicatively connected with the unit cabinet.

2. The frequency converter device according to claim 1, characterized in that: The number of the unit cabinets is at least 2, and the at least 2 unit cabinets include a first unit cabinet and a second unit cabinet that are adjacent to each other; The frequency converter device also includes: A first copper bar, wherein a first end of the first copper bar is electrically connected to an output end of one of the power strings in the first unit cabinet, and a second end of the first copper bar is electrically connected to an input end of one of the power strings in the second unit cabinet.

3. The frequency converter device according to claim 1, characterized in that: The unit cabinet comprises a first unit cabinet and a second unit cabinet; The power string in the first unit cabinet includes at least two of the first power units; The power string in the second unit cabinet includes at least four of the first power units.

4. The frequency converter device according to claim 1, characterized in that: The unit cabinet further includes a second installation cavity, in which three second power units are arranged, and each of the three second power units is electrically connected to the N power strings.

5. The frequency converter device according to claim 4, characterized in that: The unit cabinet also includes: A second copper busbar, two adjacent first power units in the power string are connected in series through the second copper busbar.

6. The frequency converter device according to claim 5, characterized in that: The unit cabinet also includes: a first cable, through which the 3N power strings are electrically connected; A second cable, each of the power strings is electrically connected to one of the second power units through the second cable.

7. The frequency converter device according to claim 6, characterized in that: The unit cabinet also includes: The current sensor is arranged on the second cable.

8. The frequency converter device according to claim 6, characterized in that: The unit cabinet also includes: 3N partitions are arranged at intervals in the unit cabinet, and the 3N partitions divide the cavity of the unit cabinet into the second installation cavity and 3N first installation cavities. The partitions are provided with wire holes, and the first cables and the second cables are passed through the wire holes.

9. The frequency converter device according to any one of claims 1 to 7, characterized in that: Also includes: A heat dissipation component is arranged on the top of the unit cabinet.

10. The frequency converter device according to any one of claims 1 to 7, characterized in that: The unit cabinet also includes: An aviation plug interface is arranged on a side wall of the unit cabinet and is electrically connected to the power string.

11. The frequency converter device according to any one of claims 1 to 7, characterized in that: The control cabinet comprises: Cabinet; A door body, which is openably and closably disposed on the cabinet body; A control panel is arranged on the door body.

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