Frequency converter system

Abstract

The utility model provides a frequency converter system comprising a first frequency converter which comprises a plurality of cascaded first power units; the second frequency converter comprises a plurality of cascaded second power units; and the transformer is connected with the first power unit and the second power unit and supplies power to the first power unit and the second power unit. The frequency converter system is of a double-machine integrated type frequency converter structure, two frequency converters share one transformer, one transformer can provide power for the two frequency converters at the same time, the occupied area can be reduced, the space utilization rate can be improved, particularly, the height space can be effectively utilized, and cost can be saved; and the reliability of the frequency converter system can be improved.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, and in particular to a frequency converter system. Background Technology

[0002] A variable speed drive (VSD) (also known as a variable-frequency drive (VFD)) is a power control device that controls a motor by changing the frequency and amplitude of its output voltage. It is widely used in power generation, wind turbines, water pumps, belt conveyors, and laboratory power supplies. Some VFD systems utilize two VFDs simultaneously. The conventional design uses two independent VFDs, each with its own transformer. However, this approach is space-consuming, inefficient, costly, and unreliable. Therefore, a novel VFD system is urgently needed to address these technical challenges.

[0003] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Utility Model Content

[0004] To address one or more of the problems existing in the prior art, this utility model provides a frequency converter system, comprising:

[0005] The first frequency converter includes a plurality of cascaded first power units;

[0006] A second frequency converter, the second frequency converter comprising multiple cascaded second power units; and

[0007] A transformer that connects the first power unit and the second power unit and provides power to the first power unit and the second power unit.

[0008] Optionally, the frequency converter system further includes: a first power cabinet accommodating the first power unit, a second power cabinet accommodating the second power unit, and a transformer cabinet accommodating the transformer, wherein the first power cabinet and the second power cabinet are located at the front and rear, left and right, or top and bottom of the transformer cabinet, respectively.

[0009] Optionally, the first power cabinet and the second power cabinet are arranged symmetrically with respect to the transformer cabinet.

[0010] Optionally, the inverter system further includes: an incoming / outgoing line cabinet, the incoming / outgoing line cabinet including inverter outgoing line terminals; the first power cabinet including a first power cabinet outgoing line terminal, the second power cabinet including a second power cabinet outgoing line terminal, the first power cabinet outgoing line terminal and the second power cabinet outgoing line terminal being connected to the inverter outgoing line terminals.

[0011] Optionally, the incoming / outgoing line cabinet includes inverter incoming terminals, and the transformer includes a first transformer incoming terminal and a second transformer incoming terminal, wherein the first transformer incoming terminal and the second transformer incoming terminal are connected to the inverter incoming terminals.

[0012] Optionally, the inverter input terminals include a first inverter input terminal and a second inverter input terminal, wherein the first inverter input terminal is connected to the first transformer input terminal, and the second inverter input terminal is connected to the second transformer input terminal.

[0013] Optionally, the incoming / outgoing line cabinet includes a first incoming / outgoing line cabinet and a second incoming / outgoing line cabinet, wherein the first incoming / outgoing line cabinet includes a first inverter incoming terminal and a first inverter outgoing terminal, the first inverter incoming terminal is connected to the first transformer incoming terminal, and the first inverter outgoing terminal is connected to the first power cabinet outgoing terminal; the second incoming / outgoing line cabinet includes a second inverter incoming terminal and a second inverter outgoing terminal, the second inverter incoming terminal is connected to the second transformer incoming terminal, and the second inverter outgoing terminal is connected to the second power cabinet outgoing terminal.

[0014] Optionally, the inverter system further includes a control module and a control cabinet housing the control module, the control module being connected to the first power unit and the second power unit.

[0015] Optionally, the control module includes a first control module and a second control module, and the control cabinet includes a first control cabinet and a second control cabinet. The first control module and the second control module are respectively located in the first control cabinet and the second control cabinet, and the first control module is connected to the first power unit, and the second control module is connected to the second power unit.

[0016] Optionally, the inverter system further includes: a first bypass module and a second bypass module, wherein the first bypass module and the second bypass module are respectively located in a first bypass cabinet and a second bypass cabinet, and the first bypass module is connected to the first control module, and the second bypass module is connected to the second control module.

[0017] Optionally, the first bypass cabinet and the second bypass cabinet are set separately; or the first bypass cabinet and the second bypass cabinet are respectively integrated into the first control cabinet and the second control cabinet; or the first bypass cabinet and the second bypass cabinet are respectively integrated into the first incoming and outgoing line cabinet and the second incoming and outgoing line cabinet.

[0018] Optionally, the transformer includes a split transformer.

[0019] Optionally, the first power unit located at the end and the second power unit located at the end are adapted to be connected to a motor.

[0020] The inverter system of this utility model can supply power to two inverters simultaneously through one transformer, and can synchronously control the two inverters through one control module. It can reduce the footprint, improve space utilization, especially effectively utilize vertical space, save costs, and help improve the reliability, stability and safety of the inverter system. It is suitable for dual-machine hot standby situations. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 A schematic diagram of a frequency converter system according to some embodiments of the present invention is shown.

[0023] Figure 2 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown.

[0024] Figure 3 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown.

[0025] Figure 4 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown.

[0026] Figure 5 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown.

[0027] Figure 6 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown.

[0028] Figure 7A A front view of a frequency converter system according to some embodiments of the present invention is shown.

[0029] Figure 7B A rear view of a frequency converter system according to some embodiments of the present invention is shown.

[0030] Figure 7C A top view of a frequency converter system according to some embodiments of the present invention is shown.

[0031] Figure 7D A left view of a frequency converter system according to some embodiments of the present invention is shown.

[0032] Figure 7EA right view of a frequency converter system according to some embodiments of the present invention is shown.

[0033] Figure 8A A front view of a frequency converter system according to some embodiments of the present invention is shown.

[0034] Figure 8B A rear view of a frequency converter system according to some embodiments of the present invention is shown.

[0035] Figure 8C A top view of a frequency converter system according to some embodiments of the present invention is shown.

[0036] Figure 9 A schematic diagram of a transformer according to some embodiments of the present invention is shown. Detailed Implementation

[0037] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "coupling" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The following provides many different embodiments or examples for implementing various structures of this invention. To simplify the invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0042] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0043] This utility model provides a frequency converter system. Figure 1 A schematic diagram of a frequency converter system 100 according to some embodiments of the present invention is shown. Figure 1 As shown, the frequency converter system 100 includes a first frequency converter 10, a second frequency converter 20, and a transformer 30. The first frequency converter 10 includes multiple cascaded first power units 11 ( Figure 1 An exemplary first power unit 11 is shown. The second frequency converter 20 includes a plurality of cascaded second power units 21 ( Figure 1An exemplary second power unit 21 is shown. A transformer 30 connects the first power unit 11 and the second power unit 21, and provides power to both. The inverter system of this invention is a dual-machine integrated inverter structure, where two inverters share one transformer. One transformer can simultaneously power both inverters, reducing the footprint, improving space utilization, especially in terms of vertical space, saving costs, and improving the reliability of the inverter system. Although not shown in the figures, it is understood that the transformer can be connected to the power grid or other voltage sources to provide power to the first and second power units.

[0044] In some embodiments, such as Figure 1 As shown, the inverter system 100 also includes a first power cabinet H1 that houses the first power unit 11, a second power cabinet H2 that houses the second power unit 21, and a transformer cabinet H3 that houses the transformer 30.

[0045] In some embodiments, the first power cabinet H1 and the second power cabinet H2 are located at the front and rear, left and right, or top and bottom of the transformer cabinet H3, respectively. It should be noted that "front and rear, left and right, or top and bottom" here can mean directly in front and rear, left and right, or top and bottom, or diagonally in front and rear, left and right, or top and bottom. In practical applications, this can be configured according to requirements.

[0046] In some embodiments, the first power cabinet H1 and the second power cabinet H2 can be symmetrically arranged with the transformer cabinet H3 as the center. This structural design is simple, keeps the center of gravity of the entire frequency converter system in the center so that it is not easy to tip over, and reduces electromagnetic interference, which helps to improve the stability and reliability of the frequency converter system.

[0047] Figure 2 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown. For example... Figure 2 As shown, the inverter system 100 also includes an incoming / outgoing line cabinet H4. The incoming / outgoing line cabinet H4 includes an inverter outgoing terminal OUT. The first power cabinet H1 includes a first power cabinet outgoing terminal out1. The second power cabinet H2 includes a second power cabinet outgoing terminal out2. The first power cabinet outgoing terminal out1 and the second power cabinet outgoing terminal out2 are both connected to the inverter outgoing terminal OUT. The incoming / outgoing line cabinet H4 also includes an inverter incoming terminal IN. The transformer 30 includes a first transformer incoming terminal in1 and a second transformer incoming terminal in2. The first transformer incoming terminal in1 and the second transformer incoming terminal in2 are both connected to the inverter incoming terminal IN. Figure 2In this embodiment, the two incoming terminals (in1, in2) of the transformer share the inverter incoming terminal (IN) of the incoming / outgoing line cabinet. This provides a single power supply for the two incoming terminals of the transformer, saving costs and avoiding power supply failures during the switching process between the two power supplies, thus improving the reliability of the inverter system. The outgoing terminals (out1, out2) of the two power cabinets share the outgoing terminal (OUT) of the incoming / outgoing line cabinet. This helps to save on the cable costs from the two inverters to the motor.

[0048] Figure 3 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown. For example... Figure 3 As shown, the inverter input terminals IN include a first inverter input terminal IN1 and a second inverter input terminal IN2. The first inverter input terminal IN1 is connected to the first transformer input terminal IN1. The second inverter input terminal IN2 is connected to the second transformer input terminal IN2. The first power cabinet output terminal OUT1 and the second power cabinet output terminal OUT2 are both connected to the inverter output terminal OUT. Figure 3 In this embodiment, the two incoming terminals (in1, in2) of the transformer are respectively connected to the two incoming terminals (IN1, IN2) of the frequency converter in the incoming / outgoing line cabinet. This allows each of the two incoming terminals of the transformer to be supplied with a separate power supply, and if one power supply fails, it can automatically switch to the other power supply, thereby improving the reliability of the frequency converter system. The outgoing terminals (out1, out2) of the two power cabinets share the outgoing terminal (OUT) of the incoming / outgoing line cabinet, which can save on the cable cost from the two frequency converters to the motor.

[0049] Figure 4 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown. For example... Figure 4 As shown, the incoming / outgoing line cabinet H4 includes a first incoming / outgoing line cabinet H41 and a second incoming / outgoing line cabinet H42. The first incoming / outgoing line cabinet H41 includes a first inverter incoming terminal IN1 and a first inverter outgoing terminal OUT1. The first inverter incoming terminal IN1 is connected to the first transformer incoming terminal in1. The first inverter outgoing terminal OUT1 is connected to the first power cabinet outgoing terminal out1. The second incoming / outgoing line cabinet H42 includes a second inverter incoming terminal IN2 and a second inverter outgoing terminal OUT2. The second inverter incoming terminal IN2 is connected to the second transformer incoming terminal in2. The second inverter outgoing terminal OUT2 is connected to the second power cabinet outgoing terminal out2. Figure 5In this embodiment, the two input terminals (in1, in2) of the transformer are respectively connected to the two input terminals (IN1, IN2) of the frequency converter in the input / output cabinet. This allows each input terminal of the transformer to be supplied with a separate power supply. If one power supply fails, the system can automatically switch to the other, improving the reliability of the frequency converter system. The output terminals (out1, out2) of the two power cabinets are respectively connected to the two output terminals (OUT) of the input / output cabinet. This allows the system to automatically switch to the other frequency converter if one frequency converter fails or malfunctions, enabling the motor to continue operating and further improving the reliability of the frequency converter system.

[0050] Figure 5 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown. For example... Figure 5 As shown, the inverter system 100 also includes a control module C and a control cabinet H5 housing the control module C. The control module C is connected to the first power unit 11 and the second power unit 21. The control module C can control the operation of the first power unit 11 and the second power unit 21. In other words, the power units of the two inverters can share a single control module, enabling one control module to control both inverters. This helps save space and cost. In some embodiments, the control module C can be the main control module of the first inverter 10. Alternatively, the control module C can be the main control module of the second inverter 20. Or, the control module C can be any other control module besides the main control modules of the first inverter 10 and the second inverter 20, such as a remote control module.

[0051] Figure 6 A partial schematic diagram of a frequency converter system according to some embodiments of the present invention is shown. For example... Figure 6 As shown, control module C includes a first control module C1 and a second control module C2. Control cabinet H5 includes a first control cabinet H51 and a second control cabinet H52. The first control module C1 and the second control module C2 are located in the first control cabinet H51 and the second control cabinet H52, respectively. The first control module C1 is connected to the first power unit 11. The first control module C1 can control the operation of the first power unit 11. The second control module C2 is connected to the second power unit 21. The second control module C2 can control the operation of the second power unit 21. The first control module C1 can be the main control module of the first frequency converter 10. The second control module C2 can be the main control module of the second frequency converter 20. Optionally, the first control module C1 can be connected to the second control module C2, and the two can communicate with each other.

[0052] In some embodiments, the first power unit 11 and the second power unit 21 may include a switching transistor (not shown) and a diode (not shown). Control module C / first control module C1 / second control module C2 can control the switching on and off of the switching transistor and / or the diode. The switching transistor may include one or more of an insulated-gate bipolar transistor (IGBT), an integrated-gate commutated thyristor (IGCT), or an injection-enhanced-gate transistor (IEGT). The diode may include a fast recovery diode (FRD). However, the present invention is not limited thereto.

[0053] In some embodiments, such as Figure 5 or Figure 6 As shown, the first frequency converter 10 includes multiple cascaded first power units 11. The multiple first power units 11 are arranged in three rows, with each row forming a power unit group and the three rows forming three power unit groups. The second frequency converter 20 includes multiple cascaded second power units 21. The multiple second power units 21 are arranged in three rows, with each row forming a power unit group and the three rows forming three power unit groups. The three first power units 11 located at the end (closest to the motor M) and the three second power units 21 located at the end (closest to the motor M) are adapted to connect to the motor M. That is, the three-phase output terminals of the power units of the first frequency converter 10 and the second frequency converter 20 can be connected to a single motor. This enables dual-machine hot standby; even if one frequency converter fails, the motor can still be controlled to continue running through the other frequency converter, which helps improve the reliability of the frequency converter system.

[0054] Figures 7A to 7E A schematic diagram of the layout of a frequency converter system according to some embodiments of the present invention is shown. Figure 7A A front view of a frequency converter system according to some embodiments of the present invention is shown. Figure 7B A rear view of a frequency converter system according to some embodiments of the present invention is shown. Figure 7C A top view of a frequency converter system according to some embodiments of the present invention is shown. Figure 7D A left view of a frequency converter system according to some embodiments of the present invention is shown. Figure 7E A right view of a frequency converter system according to some embodiments of the present invention is shown. For example... Figure 1 and Figures 7A to 7EAs shown, taking transformer cabinet H3 as the base, a second power cabinet H2 is arranged on the front side of transformer cabinet H3, and a first power cabinet H1 is arranged on the rear side of transformer cabinet H3. Transformer 30 provides power to the second power unit 21 and the first power unit 11 on the front and rear sides. A second control cabinet H52 is arranged on the left side of the second power cabinet H2. A first control cabinet H51 is arranged on the right side of the first power cabinet H1. An incoming / outgoing line cabinet H4 is arranged on the left side of transformer cabinet H3. The incoming / outgoing line cabinet H4 is a shared cabinet.

[0055] In some embodiments, such as Figure 6 As shown, the inverter system 100 may include a first bypass module B1 and a second bypass module B2. The first bypass module B1 and the second bypass module B2 are located in the first bypass cabinet H61 and the second bypass cabinet H62, respectively. The first bypass cabinet H61 and the second bypass cabinet H62 can be set up independently. Alternatively, the first bypass cabinet H61 and the second bypass cabinet H62 can be integrated into the first control cabinet H51 and the second control cabinet H52, respectively. Alternatively, the first bypass cabinet H61 and the second bypass cabinet H62 can be integrated into the first incoming / outgoing line cabinet H41 and the second incoming / outgoing line cabinet H42, respectively. The first bypass module B1 is connected to the first control module C1. The second bypass module B2 is connected to the second control module C2. When the first inverter or the second inverter fails, the first bypass module B1 or the second bypass module B2 can activate the bypass function by controlling the bypass switch to turn on or off, ensuring continuous motor operation and improving the reliability of the inverter system. The bypass switch can be located at the output end of the power unit, but is not limited to this.

[0056] In some embodiments, the bypass switch can be a field-effect transistor (FET), a bipolar junction transistor (BJT), a relay, a silicon controlled rectifier (SCR), a contactor, a potentiometer, a mechanical switch, or any other switching device that can perform an equivalent or similar function. The FET can be a metal-oxide-semiconductor field-effect transistor (MOSFET). The MOSFET can be a P-channel metal-oxide-semiconductor field-effect transistor (PMOS). Alternatively, the FET can be an N-channel metal-oxide-semiconductor field-effect transistor (NMOS).

[0057] In some embodiments, control module C / first control module C1 / second control module C2 / first bypass module B1 / second bypass module B2 may include control circuits, pulse width modulators, PI regulators, central processing units (CPUs), microcontroller units (MCUs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), programmable logic controllers (PLCs), complex programmable logic devices (CPLDs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or similar devices or circuits.

[0058] It should be noted that the first bypass module B1 and the second bypass module B2 are optional and not mandatory. In practical applications, they can be configured according to requirements.

[0059] Figures 8A to 8CA schematic diagram of the layout of a frequency converter system according to some embodiments of the present invention is shown. Figure 8A A front view of a frequency converter system according to some embodiments of the present invention is shown. Figure 8B A rear view of a frequency converter system according to some embodiments of the present invention is shown. Figure 8C A top view of a frequency converter system according to some embodiments of the present invention is shown. For example... Figure 1 and Figures 8A to 8C As shown, taking transformer cabinet H3 as a reference, a second power cabinet H2 is arranged on the front side of transformer cabinet H3, and a first power cabinet H1 is arranged on the rear side of transformer cabinet H3. Transformer 30 provides power to the second power unit 21 and the first power unit 11 on the front and rear sides. A second control cabinet H52 is arranged on the left side of the second power cabinet H2. A first control cabinet H51 is arranged on the right side of the first power cabinet H1. A second incoming / outgoing line cabinet H42 is arranged on the left side of transformer cabinet H3. That is, the second incoming / outgoing line cabinet H42 is arranged behind the second control cabinet H52. A first incoming / outgoing line cabinet H41 is arranged on the right side of transformer cabinet H3. That is, the first incoming / outgoing line cabinet H41 is arranged in front of the first control cabinet H51. Optionally, a second bypass cabinet H62 is arranged in the second incoming / outgoing line cabinet H42. A first bypass cabinet H61 is arranged in the first incoming / outgoing line cabinet H41.

[0060] In some embodiments, the first power cabinet, the second power cabinet, the transformer cabinet, the control cabinet, the first control cabinet, the second control cabinet, the incoming / outgoing line cabinet, the first incoming / outgoing line cabinet, the second incoming / outgoing line cabinet, the first bypass cabinet, and the second bypass cabinet can be independent structural frames, or they can be different compartments within the same frame, or two or more can share a single compartment. In practical applications, the configuration can be tailored to specific requirements.

[0061] In some embodiments, transformer 30 can be a split transformer. The split transformer can be connected to the power grid and can supply power to the first inverter 11 and the second inverter 12. The split transformer can increase impedance and reduce short circuits, thus helping to improve the safety, reliability, and stability of the inverter system. Figure 9 A schematic diagram of a transformer according to some embodiments of the present invention is shown. For example... Figure 1 and Figure 9As shown, transformer 30 includes a first primary winding 301, a second primary winding 302, a third primary winding 303, a fourth primary winding 304, an iron core T, a first secondary winding 305, and a second secondary winding 306. The first primary winding 301, the second primary winding 302, and the first secondary winding 305 supply power to the first frequency converter 10 (first power unit 11). The third primary winding 303, the fourth primary winding 304, and the second secondary winding 306 supply power to the second frequency converter 20 (second power unit 21). Transformer 30 adopts a double-split structure; the first frequency converter 10 and the second frequency converter 20 share transformer 30 and their shared iron core structure, which can improve the ampere-turn imbalance problem and help improve the stability, reliability, and safety of the frequency converter system. It should be noted that... Figure 9 The four primary edges and two secondary edges shown are merely illustrative and do not constitute a limitation of this utility model. In practical applications, parameters such as the number of primary edges and secondary edges can be set according to requirements, and these are all within the protection scope of this utility model.

[0062] In some embodiments, the inverter system 100 may include a memory (not shown). The memory may be located within the first inverter 11 and / or the second inverter 12. Alternatively, the memory may be located outside the first inverter 11 and / or the second inverter 12, such as in a cloud storage device. The memory may store information such as inverter operating data.

[0063] In some embodiments, the memory may include random access memory (RAM) or non-volatile memory. Further, the memory may include at least one of phase-change random access memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), read-only memory (ROM), and electrically erasable programmable read-only memory (EEPROM). In some embodiments, the memory may be cloud storage. All of these are within the scope of protection of this utility model.

[0064] Control modules and transformers are components with low failure rates. The frequency converter system of this invention can supply power to two frequency converters simultaneously through one transformer and can synchronously control two frequency converters through one control module. This can reduce the footprint, improve space utilization, and especially effectively utilize vertical space, thereby saving costs and helping to improve the reliability, stability and safety of the frequency converter system. It is suitable for dual-machine hot standby situations.

[0065] It should be noted that although several modules of the frequency converter / frequency converter system have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this utility model, the features and functions of two or more modules described above can be implemented in one module. Conversely, the features and functions of one module described above can be further divided and specified by multiple modules.

[0066] It should be noted that this utility model may only include Figure 1-9 Any one or more features of any one or more embodiments. In other words, not all of the features shown need to be implemented simultaneously in the inverter system of this utility model.

[0067] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A frequency converter system, characterized in that, include: The first frequency converter includes a plurality of cascaded first power units; The second frequency converter includes multiple cascaded second power units; A transformer that connects the first power unit and the second power unit and provides power to the first power unit and the second power unit; A first power cabinet accommodating the first power unit, a second power cabinet accommodating the second power unit, and a transformer cabinet accommodating the transformer, wherein the first power cabinet and the second power cabinet are respectively located on the front and back, left and right, or top and bottom sides of the transformer cabinet; and The incoming / outgoing line cabinet includes inverter outgoing line terminals; the first power cabinet includes a first power cabinet outgoing line terminal, and the second power cabinet includes a second power cabinet outgoing line terminal, wherein the first power cabinet outgoing line terminal and the second power cabinet outgoing line terminal are connected to the inverter outgoing line terminals.

2. The frequency converter system according to claim 1, characterized in that, The first power cabinet and the second power cabinet are arranged symmetrically with respect to the transformer cabinet.

3. The frequency converter system according to claim 1, characterized in that, The incoming and outgoing line cabinet includes inverter incoming line terminals, and the transformer includes a first transformer incoming line terminal and a second transformer incoming line terminal. The first transformer incoming line terminal and the second transformer incoming line terminal are connected to the inverter incoming line terminal.

4. The frequency converter system according to claim 3, characterized in that, The inverter input terminals include a first inverter input terminal and a second inverter input terminal, wherein the first inverter input terminal is connected to the first transformer input terminal, and the second inverter input terminal is connected to the second transformer input terminal.

5. The frequency converter system according to claim 3, characterized in that, The incoming / outgoing line cabinet includes a first incoming / outgoing line cabinet and a second incoming / outgoing line cabinet. The first incoming / outgoing line cabinet includes a first inverter incoming terminal and a first inverter outgoing terminal. The first inverter incoming terminal is connected to the first transformer incoming terminal, and the first inverter outgoing terminal is connected to the first power cabinet outgoing terminal. The second incoming / outgoing line cabinet includes a second inverter incoming terminal and a second inverter outgoing terminal. The second inverter incoming terminal is connected to the second transformer incoming terminal, and the second inverter outgoing terminal is connected to the second power cabinet outgoing terminal.

6. The frequency converter system according to any one of claims 1-5, characterized in that, Also includes: A control module and a control cabinet housing the control module, wherein the control module is connected to the first power unit and the second power unit.

7. The frequency converter system according to claim 6, characterized in that, The control module includes a first control module and a second control module, and the control cabinet includes a first control cabinet and a second control cabinet. The first control module and the second control module are respectively located in the first control cabinet and the second control cabinet, and the first control module is connected to the first power unit, and the second control module is connected to the second power unit.

8. The frequency converter system according to claim 7, characterized in that, Also includes: A first bypass module and a second bypass module are located in a first bypass cabinet and a second bypass cabinet, respectively. The first bypass module is connected to the first control module, and the second bypass module is connected to the second control module.

9. The frequency converter system according to claim 8, characterized in that, The first bypass cabinet and the second bypass cabinet are set up separately; or the first bypass cabinet and the second bypass cabinet are respectively integrated into the first control cabinet and the second control cabinet; or the first bypass cabinet and the second bypass cabinet are respectively integrated into the first incoming and outgoing line cabinet and the second incoming and outgoing line cabinet.

10. The frequency converter system according to any one of claims 1-5, characterized in that, The transformer includes a split transformer.

11. The frequency converter system according to any one of claims 1-5, characterized in that, The first power unit located at the end and the second power unit located at the end are adapted to connect to a motor.

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