Ultrathin three-level single-tube SVG module

Abstract

The ultrathin three-level single-tube SVG module comprises a shell, a control panel, an energy storage capacitor, a Hall current transformer, an LCL, a cooling fan, an IGBT assembly, a man-machine interaction assembly and an interface assembly, wherein the control panel, the energy storage capacitor, the Hall current transformer, the LCL, the cooling fan and the IGBT assembly are arranged in a containing cavity formed by the shell, and the man-machine interaction assembly and the interface assembly are embedded into the side face of the shell. Wherein the control panel drives the IGBT assembly and the LCL to invert current which is equal to the pollution current in size and opposite to the pollution current in phase according to power grid sampling data fed back by the interface assembly and / or output current fed back by the Hall current transformer, so as to counteract the current which pollutes the power grid. Wherein the IGBT assembly comprises a T-shaped radiator, four IGBT elements and two hooping diodes, and the four IGBT elements and the two hooping diodes are arranged on the T-shaped radiator. Compared with an IGBT integrated module, the cost of the whole IGBT assembly is reduced by nearly a half, and the cost performance is extremely high. In addition, the SVG module is small in size, light in weight, complete in function, convenient to expand and long in service life.

Description

Technical Field

[0001] This application relates to the technical field of reactive power compensation, and particularly to an ultra-thin three-level single-tube SVG module. Background Art

[0002] Most electrical equipment in the power grid is inductive. Insufficient reactive power reserve will lead to a decrease in the system power factor, voltage drop, increased line loss, three-phase imbalance, etc., thus affecting the power quality. In severe cases, it will even threaten the safe and stable operation of the power system, cause the power grid to collapse, and result in significant losses. In order to ensure the stability of power transmission, it is necessary to perform reactive power compensation on the power grid.

[0003] The Static Var Generator (SVG) has a fast response speed, low operating loss, low noise, simple maintenance, and can achieve wide-range continuous compensation of reactive power from inductive to capacitive. It has been recognized in the power system and flexible transmission technology. With the rapid development of power electronics technology, SVG has become the development trend in the field of intelligent reactive power compensation.

[0004] However, traditional SVG products are large in volume, heavy in weight, and high in power consumption; the insulated gate bipolar transistor (IGBT) integrated module in SVG products, although convenient for welding and installation, is high in cost and inconvenient for installation, maintenance, and replacement. These disadvantages have hindered the further development of SVG products. Summary of the Invention

[0005] The purpose of this application is to provide an ultra-thin three-level single-tube SVG module, which can improve the above problems.

[0006] The embodiments of this application are implemented as follows:

[0007] This application provides an ultra-thin three-level single-tube SVG module, which includes a housing, a control board, an energy storage capacitor, a Hall current transformer, a line commutated inverter (LCL), a cooling fan, and an IGBT component disposed in the accommodation cavity formed by the housing, and a human-computer interaction component and an interface component embedded on the side surface of the housing;

[0008] The control board is electrically connected to the human-machine interaction component, the cooling fan, the interface component, the Hall current transformer, and the IGBT component respectively. The IGBT component is electrically connected to the energy storage capacitor, and the LCL is electrically connected to the Hall current transformer. The control board is configured to drive the IGBT component to achieve boost and voltage regulation control of the energy storage capacitor according to the grid sampling data fed back by the interface component and / or the output current fed back by the Hall current transformer, and control the LCL to invert an inverter current that cancels the pollution current.

[0009] The IGBT component is disposed at a position close to the first side surface of the housing. The cooling fan is disposed on the inner wall of the first side surface and is configured to blow air toward the IGBT. A ventilation opening is provided on the second side surface opposite to the first side surface.

[0010] The IGBT component includes a T-shaped radiator, IGBT elements, clamping diodes, and a drive board. The T-shaped radiator includes a main heat sink and at least one left fin and at least one right fin symmetrically disposed on the main heat sink. Two of the IGBT elements and one of the clamping diodes are respectively disposed on the left side surface and the right side surface of the main heat sink. The drive board is parallel to the main heat sink and is disposed between the left fin and the bottom surface of the housing, and is configured to control the IGBT elements according to instructions from the control board.

[0011] It can be understood that the present application discloses an ultra-thin three-level single-tube SVG module, which includes a housing, a control board, an energy storage capacitor, a Hall current transformer, an LCL, a cooling fan, and an IGBT component disposed in a receiving cavity formed by the housing, and a human-machine interaction component and an interface component embedded in the side surface of the housing. Among them, the control board drives the IGBT component to achieve boost and voltage regulation control of the energy storage capacitor according to the grid sampling data fed back by the interface component and / or the output current fed back by the Hall current transformer, and controls the LCL to invert a current that is equal in magnitude and opposite in phase to the pollution current to cancel the current that pollutes the power grid and restore it to a sine wave, so as to achieve the purpose of treating power pollution and improving power quality. Among them, the IGBT component includes a T-shaped radiator and four of the IGBT elements and two of the clamping diodes disposed on the T-shaped radiator. The overall cost of this IGBT component is nearly reduced by half compared with that of using an IGBT integrated module, and the cost performance is extremely high. In addition, this SVG module is small in volume, light in weight, full in function, convenient to expand, and long in service life.

[0012] In the embodiment of the present application, the energy storage capacitor provides energy support for the inverter. Since the configured capacitor is relatively large, in addition to compensation, it has the ability to process harmonics and adjust three-phase imbalance in terms of hardware. The Hall current transformer is small in volume, large in overcurrent, accurate in measurement, and small in error, providing hardware support for the control algorithm to provide real-time sampled current signals for control.

[0013] In the embodiment of the present application, in order to reduce the weight of the product, the housing is made of aluminum alloy. In order to increase the mechanical strength, the iron material is replaced at the interface component. The aluminum alloy housing is small in volume and light in weight, supports hot plugging and unplugging without power interruption, and is convenient for installation, maintenance and expansion. It can be installed in a relatively small JP integrated distribution box or a box-type substation.

[0014] In an alternative embodiment of the present application, heat dissipation silicone grease is also coated on the outside of the IGBT element and the clamping diode, and a ceramic sheet is also provided between the IGBT element and the main heat sink, and a ceramic sheet is also provided between the clamping diode and the main heat sink to achieve a heat insulation effect.

[0015] In an alternative embodiment of the present application, a temperature sensor is also provided on the T-shaped heat sink. The temperature sensor and the cooling fan are respectively electrically connected to the control board. The control board is used to control the current power of the cooling fan according to the current temperature fed back by the temperature sensor. In addition, the controller is also used to control the LCL to reduce the generated inverter current according to the current temperature fed back by the temperature sensor.

[0016] In an alternative embodiment of the present application, a power supply component is also provided in the accommodation cavity formed by the housing. The power supply component includes a first power module and a second power module connected to each other. The first power module is used to convert 220V voltage into 24V DC voltage, and the second power module is used to convert 24V DC voltage into 15V AC voltage; the output end of the first power module is electrically connected to the IGBT component, the human-computer interaction component and the cooling fan to supply power to the IGBT component, the human-computer interaction component and the cooling fan; the output end of the second power module is electrically connected to the Hall current transformer and the control board to supply power to the Hall current transformer and the control board.

[0017] In an alternative embodiment of the present application, the control board includes a Digital Signal Processor (DSP) and a Complex Programmable Logic Device (CPLD). The DSP is used to decompose the fundamental wave current and the polluted current according to the grid sampling data fed back by the interface component and / or the output current fed back by the Hall current transformer, and calculate the Pulse Width Modulation (PWM) duty cycle. The CPLD is used to correct the calculation result of the DSP and add a dead zone;

[0018] The control board further includes a first power conversion circuit and a second power conversion circuit; the first power conversion circuit is used to convert the 15V AC voltage into 5V voltage, and the output terminal of the first power conversion circuit is electrically connected to the DSP to supply power to the DSP; the second power conversion circuit is used to convert the 5V AC voltage into 3.3V voltage, and the output terminal of the first power conversion circuit is electrically connected to the CPLD to supply power to the CPLD.

[0019] In an alternative embodiment of the present application, the interface component includes a power supply area, a sampling signal area, and a communication area; the cable area crimped by the terminals in the power supply area is larger than the cable area crimped by the terminals in the sampling signal area; the cable area crimped by the terminals in the sampling signal area is larger than the cable area crimped by the terminals in the communication area;

[0020] The power supply area is provided with a first-phase power input terminal, a second-phase power input terminal, a third-phase power input terminal, and an N-line terminal; the sampling signal area is provided with a ground terminal and 6 sampling signal input terminals: a first positive signal terminal, a second positive signal terminal, a third positive signal terminal, a first negative signal terminal, a second negative signal terminal, and a third negative signal terminal; the communication area is provided with a 24V power output positive terminal, a 24V power output negative terminal, an output signal common terminal, an output signal fault indication terminal, an output signal operation indication terminal, a first input signal terminal, a second input signal terminal, a first 485 signal positive terminal, a first 485 signal negative terminal, a second 485 signal positive terminal, a second 485 signal negative terminal, a third 485 signal positive terminal, a third 485 signal negative terminal, a CAN-L terminal, and a CAN-H terminal.

[0021] The interface component adopted in the present application may be a 51 aviation plug, and the aviation plug separates and arranges the strong electric terminals and the weak electric terminals according to the magnitude of the current.

[0022] In an alternative embodiment of the present application, a pre-charging component, an output current detection module, and a fuse protection component are sequentially connected between the LCL and the interface component; the pre-charging component is used to prevent the electrolytic capacitor from being rectified and charged through the IGBT component during power-on, resulting in the failure of the IGBT component; the output current detection module is used to perform output waveform control to prevent the SVG module from resonating with the power grid; the fuse protection component is used to fuse when a short circuit occurs or the current exceeds the rated current, so that the SVG module is disconnected from the grid.

[0023] Among them, the pre-charging component includes a cement resistor and a power relay connected in parallel; when power is applied, the power relay is disconnected, and the pre-charging current is limited by the cement resistor to charge the energy storage capacitor; when the starting current needs to be output, the relay is closed to short-circuit the cement resistor.

[0024] In an alternative embodiment of the present application, the human-computer interaction component includes a processor, an input device, an output device, and a memory. The processor, input device, output device, and memory are interconnected. Among them, the memory is used to store computer programs, and the processor is configured to call the program instructions; the processor is electrically connected to the control board.

[0025] Among them, the input device may include a touchpad, a fingerprint sensor, a microphone, etc., and the output device may include a display, a speaker, etc. The human-computer interaction component can be an all-in-one machine or a split machine, and the input device and the output device are arranged facing the outside of the housing.

[0026] Beneficial effects:

[0027] The present application discloses a thin-film three-level single-tube SVG module, which includes a housing, a control board, an energy storage capacitor, a Hall current transformer, an LCL, a cooling fan, and an IGBT component disposed in the accommodation cavity formed by the housing, and a human-computer interaction component and an interface component embedded in the side surface of the housing. Among them, the control board drives the IGBT component according to the grid sampling data fed back by the interface component and / or the output current fed back by the Hall current transformer to realize the boost and voltage stabilization control of the energy storage capacitor, and controls the LCL to invert a current with the same magnitude and opposite phase as the pollution current to cancel the current generating the polluted grid and restore it to a sine wave, so as to achieve the purpose of treating power pollution and improving power quality.

[0028] Among them, the IGBT component includes a T-shaped radiator and four IGBT elements and two clamping diodes disposed on the T-shaped radiator. The overall cost of this IGBT component is nearly half less than that of using an IGBT integrated module, and the cost performance is extremely high.

[0029] A temperature sensor is also disposed on the T-shaped radiator. The temperature sensor and the cooling fan are respectively electrically connected to the control board. The control board controls the current power of the cooling fan according to the current temperature fed back by the temperature sensor, and controls the LCL to reduce the generated inverter current.

[0030] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically lists alternative embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. Description of the Drawings

[0031] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0032] Figure 1 is a schematic structural diagram of a thin-film three-level single-tube SVG module provided by the present application;

[0033] Figure 2 is Figure 1 a schematic principle diagram of the thin-film three-level single-tube SVG module shown;

[0034] Figure 3 is Figure 1 a schematic structural diagram of the IGBT component shown;

[0035] Figure 4 is Figure 1 a schematic structural diagram of the interface component shown. Specific Embodiments

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0037] As Figure 1 shown, the present application provides a thin-film three-level single-tube SVG module, which includes a housing 1, a control board 2, an energy storage capacitor 3, a Hall current transformer 4, a line-commutated inverter (LCL) 5, a cooling fan 6, and an IGBT component 7 disposed in the accommodation cavity formed by the housing 1, and a human-machine interaction component 8 and an interface component 9 embedded in the side surface of the housing 1.

[0038] As Figure 2 shown, the control board 2 is electrically connected to the human-machine interaction component 8, the cooling fan 6, the interface component 9, the Hall current transformer 4, and the IGBT component 7 respectively. The IGBT component 7 is electrically connected to the energy storage capacitor 3, and the LCL 5 is electrically connected to the Hall current transformer 4. The control board 2 is used to drive the IGBT component 7 to realize the boost and voltage stabilization control of the energy storage capacitor 3 according to the grid sampling data fed back by the interface component 9 and / or the output current fed back by the Hall current transformer 4, and control the LCL 5 to invert an inverter current that cancels the polluting current.

[0039] Continue to refer to Figure 1 As shown, the IGBT component 7 is arranged at a position close to the first side surface 11 of the housing 1, and the cooling fan 6 is arranged on the inner wall of the first side surface 11 for blowing air towards the IGBT, and a ventilation opening is arranged on the second side surface 12 opposite to the first side surface 11.

[0040] As Figure 3 shown, the IGBT component 7 includes a T-shaped radiator 70, an IGBT element 71, a clamping diode 72, and a drive board 73; the T-shaped radiator 70 includes a main radiator 701 and at least one left fin 702 and at least one right fin 703 symmetrically arranged on the main radiator 701. Two IGBT elements 71 and one clamping diode 72 are respectively arranged on the left side surface and the right side surface of the main radiator 701. The drive board 73 is parallel to the main radiator 701 and is arranged between the left fin 702 and the bottom surface of the housing 1 for controlling the IGBT element 71 according to the instructions of the control board 2.

[0041] It can be understood that the present application discloses an ultra-thin three-level single-tube SVG module, which includes a housing 1, a control board 2, an energy storage capacitor 3, a Hall current transformer 4, an LCL 5, a cooling fan 6, and an IGBT component 7 arranged in the accommodation cavity formed by the housing 1, and a human-computer interaction component 8 and an interface component 9 embedded on the side surface of the housing 1. Among them, the control board 2 drives the IGBT component 7 according to the grid sampling data fed back by the interface component 9 and / or the output current fed back by the Hall current transformer 4 to realize the boost and voltage stabilization control of the energy storage capacitor 3, and controls the LCL 5 to invert a current with the same magnitude and opposite phase to the pollution current to cancel the current generating the polluted grid and restore it to a sine wave, so as to achieve the purpose of treating power pollution and improving power quality. Among them, the IGBT component 7 includes a T-shaped radiator 70 and four IGBT elements 71 and two clamping diodes 72 arranged on the T-shaped radiator 70. The overall cost of this IGBT component 7 is nearly reduced by half compared with that of using an IGBT integrated module, and the cost performance is extremely high. In addition, this SVG module is small in size, light in weight, full in function, convenient for expansion, and long in service life.

[0042] In the embodiment of the present application, the energy storage capacitor 3 provides energy support for the inversion. Due to the large configured capacitor, in addition to compensation, it has the ability to process harmonics and adjust three-phase unbalance in terms of hardware. The Hall current transformer 4 is small in size, large in overcurrent, accurate in measurement, and small in error, providing hardware support for the control algorithm to provide a real-time sampled current signal for control.

[0043] In the embodiments of the present application, in order to reduce the product weight, the housing 1 is made of aluminum alloy material. In order to increase the mechanical strength, the iron material is replaced at the interface component 9. The aluminum alloy housing 1 is small in volume and light in weight, and can be hot-plugged under the condition of continuous power supply, which is convenient for installation, maintenance and expansion. It can be installed in a relatively small JP integrated distribution box or a box-type substation.

[0044] In an alternative embodiment of the present application, heat dissipation silicone grease is also coated on the outer sides of the IGBT element 71 and the clamping diode 72, and a ceramic sheet 74 is also provided between the IGBT element 71 and the main heat sink 701, and a ceramic sheet 74 is also provided between the clamping diode 72 and the main heat sink 701 to achieve the heat insulation effect.

[0045] In an alternative embodiment of the present application, a temperature sensor (not shown in the figure) is also provided on the T-shaped heat sink 70. The temperature sensor and the cooling fan 6 are respectively electrically connected to the control board 2. The control board 2 is used to control the current power of the cooling fan 6 according to the current temperature fed back by the temperature sensor. In addition, the controller is also used to control the LCL5 to reduce the generated inverter current according to the current temperature fed back by the temperature sensor.

[0046] In an alternative embodiment of the present application, a power supply component 10 is also provided in the accommodation cavity formed by the housing 1. The power supply component 10 includes a first power module and a second power module connected to each other. The first power module is used to convert 220V voltage into 24V DC voltage, and the second power module is used to convert 24V DC voltage into 15V AC voltage; the output end of the first power module is electrically connected to the IGBT component 7, the human-computer interaction component 8 and the cooling fan 6 to supply power to the IGBT component 7, the human-computer interaction component 8 and the cooling fan 6; the output end of the second power module is electrically connected to the Hall current transformer 4 and the control board 2 to supply power to the Hall current transformer 4 and the control board 2.

[0047] In an alternative embodiment of the present application, the control board 2 includes a Digital Signal Processor (DSP) and a Complex Programmable Logic Device (CPLD). The DSP is used to decompose the fundamental wave current and the polluted current according to the grid sampling data fed back by the interface component 9 and / or the output current fed back by the Hall current transformer 4, and calculate the Pulse Width Modulation (PWM) duty cycle. The CPLD is used to correct the calculation result of the DSP and add a dead zone;

[0048] The control board 2 further includes a first power conversion circuit and a second power conversion circuit; the first power conversion circuit is used to convert the 15V AC voltage into a 5V voltage, and the output terminal of the first power conversion circuit is electrically connected to the DSP for supplying power to the DSP; the second power conversion circuit is used to convert the 5V AC voltage into a 3.3V voltage, and the output terminal of the first power conversion circuit is electrically connected to the CPLD for supplying power to the CPLD.

[0049] As Figure 4 shown, the interface component 9 includes a power supply area 91, a sampling signal area 92, and a communication area 93; the cable area crimped by the terminals in the power supply area 91 is larger than the cable area crimped by the terminals in the sampling signal area 92; the cable area crimped by the terminals in the sampling signal area 92 is larger than the cable area crimped by the terminals in the communication area 93.

[0050] Continuing to refer to Figure 4 , in the power supply area 91, a first-phase power input terminal 901, a second-phase power input terminal 902, a third-phase power input terminal 903, and an N-line terminal 904 are provided; in the sampling signal area 92, a ground terminal 905 and six sampling signal input terminals are provided: a first positive signal terminal 906, a second positive signal terminal 907, a third positive signal terminal 908, a first negative signal terminal 909, a second negative signal terminal 910, and a third negative signal terminal 911; in the communication area 93, a 24V power output positive terminal 912, a 24V power output negative terminal 913, an output signal common terminal 914, an output signal fault indication terminal 915, an output signal operation indication terminal 916, a first input signal terminal 917, a second input signal terminal 918, a first 485 signal positive terminal 919, a first 485 signal negative terminal 920, a second 485 signal positive terminal 921, a second 485 signal negative terminal 922, a third 485 signal positive terminal 923, a third 485 signal negative terminal 924, a CAN-L terminal 925, and a CAN-H terminal 926 are provided.

[0051] The interface component 9 adopted in this application can be a 51 aviation plug, and the aviation plug separates and arranges the strong electrical terminals and the weak electrical terminals according to the current magnitude.

[0052] In an alternative embodiment of this application, as Figure 2As shown, a pre-charging component 21, an output current detection module 22, and a fuse protection component 23 are sequentially connected between the LCL5 and the interface component 9; the pre-charging component 21 is used to prevent the electrolytic capacitor from being rectified and charged through the IGBT component 7 during power-on, causing the IGBT component 7 to fail; the output current detection module 22 is used to control the output waveform to prevent resonance between the SVG module and the power grid; the fuse protection component 23 is used to fuse when a short circuit occurs or the current exceeds the rated current, causing the SVG module to be off-grid.

[0053] Among them, the pre-charging component 21 includes a cement resistor and a power relay connected in parallel; when power is on, the power relay is disconnected, and the pre-charging current is limited by the cement resistor to charge the energy storage capacitor 3; when the start-up current output is required, the relay is closed to short-circuit the cement resistor.

[0054] In an optional embodiment of the present application, the human-computer interaction component 8 includes a processor, an input device, an output device, and a memory. The processor, the input device, the output device, and the memory are interconnected. Among them, the memory is used to store computer programs, and the processor is configured to call program instructions; the processor is electrically connected to the control board 2.

[0055] The so-called processor may be a central processing unit (CPU), and this processor may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or this processor may also be any conventional processor, etc.

[0056] The memory may include a read-only memory and a random access memory, and provide instructions and data to the processor. A part of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type.

[0057] Among them, the input device may include a touchpad, a fingerprint sensor, a microphone, etc., and the output device may include a display, a speaker, etc. The human-computer interaction component 8 may be an all-in-one machine or a split machine, and the input device and the output device are arranged facing the outside of the housing 1.

[0058] In various embodiments of the present disclosure, the expressions "first", "second", "the first", or "the second" used may modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing an element from other elements. For example, a first user device and a second user device represent different user devices, although both are user devices. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0059] When an element (e.g., a first element) is referred to as "(operatively or communicatively) coupled" or "(operatively or communicatively) coupled to" or "connected to" another element (e.g., a second element), it should be understood that the one element is directly connected to the other element or the one element is indirectly connected to the other element via yet another element (e.g., a third element). In contrast, it can be understood that when an element (e.g., a first element) is referred to as "directly connected" or "directly coupled" to another element (a second element), then no element (e.g., a third element) is inserted therebetween.

[0060] It should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising such element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or may have different meanings, and their specific meanings need to be determined based on their explanations in the specific embodiments or further in combination with the context of the specific embodiments.

[0061] The above description is only an optional embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, a technical solution formed by mutually replacing the above features with technical features having similar functions (but not limited to) disclosed in the present application.

[0062] Depending on the context, as used herein, the words "if", "when" can be interpreted as "when...", "while...", "in response to determining", or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined", "in response to determining", "when detecting (stated condition or event)", or "in response to detecting (stated condition or event)".

[0063] The above description is only an optional embodiment of the present application and an illustration of the technical principles applied. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

[0064] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An ultra-thin three-level single-tube SVG module, characterized in that, Comprising: A housing, a control board, an energy storage capacitor, a Hall current transformer, an LCL, a cooling fan, and an IGBT module disposed in a receiving cavity formed by the housing, and a human-machine interaction module and an interface module embedded in a side surface of the housing; The control board is electrically connected to the human-machine interaction module, the cooling fan, the interface module, the Hall current transformer, and the IGBT module respectively. The IGBT module is electrically connected to the energy storage capacitor, and the LCL is electrically connected to the Hall current transformer. The control board is configured to drive the IGBT module to achieve boost and voltage stabilization control of the energy storage capacitor according to grid sampling data fed back by the interface module and / or output current fed back by the Hall current transformer, and control the LCL to invert an inverter current for canceling out pollution current; The IGBT module is disposed at a position close to a first side surface of the housing, and the cooling fan is disposed on an inner wall of the first side surface for blowing air toward the IGBT. A ventilation opening is provided on a second side surface opposite to the first side surface; The IGBT module includes a T-shaped radiator, an IGBT element, a clamping diode, and a drive board. The T-shaped radiator includes a main heat sink and at least one left fin and at least one right fin symmetrically disposed on the main heat sink. Two IGBT elements and one clamping diode are respectively disposed on a left side surface and a right side surface of the main heat sink. The drive board is parallel to the main heat sink and disposed between the left fin and the bottom surface of the housing for controlling the IGBT element according to an instruction of the control board.

2. The ultra-thin three-level single-tube SVG module according to claim 1, wherein A heat dissipation silicone grease is further coated on an outer side of the IGBT element and the clamping diode, and a ceramic sheet is further disposed between the IGBT element and the main heat sink, and a ceramic sheet is also disposed between the clamping diode and the main heat sink.

3. The ultra-thin three-level single-tube SVG module according to claim 1 or 2, wherein A temperature sensor is further disposed on the T-shaped radiator. The temperature sensor and the cooling fan are respectively electrically connected to the control board. The control board is configured to control a current power of the cooling fan according to a current temperature fed back by the temperature sensor.

4. The ultra-thin three-level single-tube SVG module according to claim 3, wherein The controller is further configured to control the LCL to reduce the generated inverter current according to the current temperature fed back by the temperature sensor.

5. The ultra-thin three-level single-tube SVG module according to claim 1, wherein A power supply module is further disposed in a receiving cavity formed by the housing. The power supply module includes a first power supply module and a second power supply module connected to each other. The first power supply module is configured to convert 220V voltage into 24V DC voltage, and the second power supply module is configured to convert 24V DC voltage into 15V AC voltage; The output terminal of the first power supply module is electrically connected to the IGBT component, the human-machine interaction component, and the cooling fan, and supplies power to the IGBT component, the human-machine interaction component, and the cooling fan; The output terminal of the second power supply module is electrically connected to the Hall current transformer and the control board, and supplies power to the Hall current transformer and the control board.

6. The ultra-thin three-level single-tube SVG module according to claim 5, characterized in that The control board includes a DSP and a CPLD. The DSP is used to decompose the fundamental wave current and the polluted current according to the grid sampling data fed back by the interface component and / or the output current fed back by the Hall current transformer, and calculate the PWM duty ratio. The CPLD is used to correct errors and add dead zones to the calculation results of the DSP; The control board further includes a first power conversion circuit and a second power conversion circuit; the first power conversion circuit is used to convert 15V AC voltage into 5V voltage, and the output terminal of the first power conversion circuit is electrically connected to the DSP to supply power to the DSP; the second power conversion circuit is used to convert 5V AC voltage into 3.3V voltage, and the output terminal of the first power conversion circuit is electrically connected to the CPLD to supply power to the CPLD.

7. The ultra-thin three-level single-tube SVG module according to claim 1, characterized in that The interface component includes a power supply area, a sampling signal area, and a communication area; the cable area crimped by the terminals in the power supply area is larger than the cable area crimped by the terminals in the sampling signal area; the cable area crimped by the terminals in the sampling signal area is larger than the cable area crimped by the terminals in the communication area; Three-phase power input terminals and N-line terminals are arranged in the power supply area; A grounding terminal and 6 sampling signal input terminals are arranged in the sampling signal area; 8 communication interface terminals, 2 power output terminals, three output signal terminals, and 2 input signal terminals are arranged in the communication area.

8. The ultra-thin three-level single-tube SVG module according to claim 1, characterized in that A pre-charging component, an output current detection module, and a fuse protection component are sequentially connected between the LCL and the interface component; The pre-charging component is used to prevent the electrolytic capacitor from being rectified and charged through the IGBT component during power-on, resulting in the failure of the IGBT component; The output current detection module is used for output waveform control to prevent the SVG module from resonating with the power grid; The fuse protection component is used to fuse when a short circuit or current exceeds the rated current, so that the SVG module is off-grid.

9. The ultra-thin three-level single-tube SVG module according to claim 8, characterized in that The pre-charging component includes a cement resistor and a power relay connected in parallel; when power is on, the power relay is disconnected, and the pre-charge current is limited by the cement resistor to charge the energy storage capacitor; when current output is required for starting up, the relay is closed to short-circuit the cement resistor.

10. The ultra-thin three-level single-tube SVG module according to claim 1, characterized in that The human-computer interaction component includes a processor, an input device, an output device, and a memory. The processor, input device, output device, and memory are interconnected. Among them, the memory is used to store computer programs, and the processor is configured to call the program instructions; the processor is electrically connected to the control board.

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