Structure convenient to operate and maintain of micro-grid battery energy storage integrated device

Abstract

The utility model discloses a convenient operation and maintenance structure of a micro-grid battery energy storage integrated device, which comprises a steel machine frame, a front panel, an upper cover plate and a lower cover plate, and is characterized in that the machine frame is formed by welding a front plate, a rear panel, a right side plate, a left side plate, a right partition plate, a left partition plate and a middle partition plate; a front panel is mounted in front of the machine frame, an upper cover plate is mounted at an upper opening, and a lower cover plate is mounted at a lower opening; the machine frame is longitudinally divided into an alternating-current box, a converter box and a direct-current box by the right partition plate and the left partition plate; the short middle partition plate is connected with the rear panel and divides the converter box into an upper converter chamber, a lower converter chamber and a front converter chamber. The micro-grid battery energy storage comprehensive device has the characteristics of simplicity and reasonability, is easy to produce and manufacture and low in cost, is convenient to operate and maintain after being installed and used, is quick and timely in fault judgment and processing, and is beneficial to improving the use effect and popularization and application.

Description

Technical Field

[0001] The utility model relates to a structure of a microgrid battery energy storage comprehensive device which is convenient for operation and maintenance. Background Art

[0002] The main function of battery energy storage equipment is to use batteries as the main body to store electricity when the grid has abundant or surplus energy and release electricity when the grid is short of energy. In other words, it can smooth the peak and fill the valley of grid electricity. It is widely used in wind power, solar power stations and electricity consumption scenarios with large peak and valley differences. It is a new energy industry that is an important component of the new power system.

[0003] Microgrid battery energy storage equipment generally adopts cabinet form, with a power of hundreds of kilowatts and stored electricity of hundreds of kilowatt-hours (kWh). It is a small and medium-sized energy storage device suitable for power regulation of industrial and commercial power users and public distribution stations.

[0004] In addition to batteries for storing electrical energy, the microgrid battery energy storage equipment cabinet also has a bidirectional power conversion system (PCS) function that converts the grid's AC power into DC power and the battery's DC power into AC power, a battery storage safety and economic operation management system (BMS) function, and a microgrid battery energy storage comprehensive device that charges and discharges energy from the energy storage battery, stores and generates electricity for equipment, and distributes and supplies electricity for safety and economic operation management system (EMS).

[0005] A microgrid battery energy storage complex is a very complex electrical, electronic, and microelectronic device containing hundreds or thousands of components. Compared with other devices in the cabinet, it has a higher failure rate, so it is very important to facilitate its operation and maintenance.

[0006] Existing microgrid battery energy storage integrated devices generally have structural irrational problems. Therefore, they are not only difficult to manufacture and have high costs, but also very difficult to operate and maintain after the device is installed. Once a failure occurs, it cannot be quickly diagnosed and handled, which affects its use effect and popularization and application. Summary of the Invention

[0007] The purpose of the utility model is to provide a structure that is convenient for operation and maintenance of a microgrid battery energy storage comprehensive device, which is convenient for operation and maintenance, has fast and timely fault diagnosis and processing, and is conducive to improving the use effect.

[0008] The technical solution of this utility model is:

[0009] A structure for a microgrid battery energy storage integrated device that facilitates operation and maintenance is characterized by comprising: a steel machine frame, a front panel, an upper cover, and a lower cover. The machine frame is welded together from the front panel, rear panel, right side panel, left side panel, right partition, left partition, and middle partition. The front panel is mounted in front of the machine frame, the upper opening is mounted with the upper cover, and the lower opening is mounted with the lower cover. The right and left partitions divide the machine frame longitudinally into an AC box, a converter box, and a DC box. The middle partition is shorter and connected to the rear panel, dividing the converter box into an upper converter chamber, a lower converter chamber, and a front converter chamber.

[0010] EMS secondary devices are installed in a metal pluggable EMS plug-in box, PCS secondary devices are installed in a metal pluggable PCS plug-in box, and BMS secondary devices are installed in a metal pluggable BMS plug-in box; there are metal EMS plug-in box guide shell, PCS plug-in box guide shell, and BMS plug-in box guide shell. The EMS plug-in box guide shell is located in the AC box and fixed at the front of the right partition, the PCS plug-in box guide shell is located in the converter box and fixed at the lower part of the converter front chamber, and the BMS plug-in box guide shell is located in the DC box and fixed at the front of the left partition; the EMS plug-in box guide shell, PCS plug-in box guide shell, and BMS plug-in box guide shell respectively have push-pull plug-in and unpluggable EMS plug-in box, PCS plug-in box, and BMS plug-in box.

[0011] The rear panel of the EMS plug-in box guide shell, PCS plug-in box guide shell and BMS plug-in box guide shell is the guide shell rear circuit board, on which there is a guide shell rear socket; the insertion end of the EMS plug-in box, PCS plug-in box and BMS plug-in box has a plug-in box connector corresponding to the guide shell rear socket, and the other end has a plug-in box panel; the area of the plug-in box panel is slightly larger than the cross-sectional area of the plug-in box; there are two fastening nuts on the two longitudinal sides of the open end of the plug-in box guide shell, and the plug-in box panel has two fastening bolts corresponding to the fastening nuts, and the fastening bolts have limiting rings; there is a plug-in box hole on the front panel corresponding to the open end of the plug-in box guide shell, and the end of the plug-in box with the connector is inserted into the connector hole and then tightened with the fastening bolts and the fastening nuts, so that the plug-in box connector is inserted into the guide shell rear socket, and thus the plug-in box is fixed to the plug-in box guide shell.

[0012] There is an external shell connection connector on the circuit board behind the guide shell; the external shell connection connector on the circuit board behind the guide shell of the EMS plug-in box has a wire or cable passing through a long anti-interference magnetic ring and is connected to the AC primary circuit or AC interface; the external shell connection connector on the circuit board behind the guide shell of the PCS plug-in box has a wire or cable passing through a long anti-interference magnetic ring and is connected to the current conversion primary circuit or current conversion interface; the external shell connection connector on the circuit board behind the guide shell of the BMS plug-in box has a wire or cable passing through a long anti-interference magnetic ring and is connected to the DC primary circuit or DC interface.

[0013] There is an AC primary circuit in the AC box, a converter primary circuit in the converter box, and a DC primary circuit in the DC box; the AC primary circuit is connected by the AC input terminals installed on or behind the front panel and the AC circuit breaker and AC fuse using connecting copper parts and connecting fasteners. The AC fuse is located at the upper cover of the AC box for loading and unloading; the operating handle of the AC circuit breaker is installed on the front panel; the converter primary circuit is connected by the filter reactor components installed in the converter upper chamber, the energy storage capacitor components installed in the converter lower chamber, and the IGBT components installed in the converter front chamber using connecting copper parts and connecting fasteners; the DC primary The circuit is composed of DC input terminals installed on the front panel or on the front panel and DC circuit breakers, DC fuses, and DC relays behind the front panel, which are connected using connecting copper parts and connecting fasteners. The DC fuses and DC relays are located at the upper part of the DC box where they can be loaded and unloaded by opening the upper cover. The operating handle of the DC circuit breaker is installed on the front panel. The AC primary circuit is connected to the filter reactance components using connecting copper parts and connecting fasteners, and the DC primary circuit is connected to the energy storage capacitor components using connecting copper parts and connecting fasteners. The AC primary circuit is equipped with an AC interface, the current conversion primary circuit is equipped with a current conversion interface, and the DC primary circuit is equipped with a DC interface.

[0014] The utility model adopts the following measures: 1. Separating the overwhelming majority of low-voltage (micro-voltage) and low-current (micro-current) secondary electronic (micro-electronic) components from the smaller, larger, high-voltage, and high-current primary components, and installing them in a PCS secondary metal box, a BMS secondary metal box, and an EMS secondary metal box that can be plugged in and out of the front panel; 2. Dividing the chassis of the device into three boxes and three chambers based on the primary components' functions, volumes, weights, heat generation, electromagnetic interference, and the dependence of the PCS, BMS, and EMS secondary metal boxes on the primary components; 3. Dividing the more complex PCS primary components (circuits) into three easily mountable and removable components; 4. Mounting all components and parts that require maintenance and installation on the front panel of the device; and 5. Mounting primary components and parts that must be unpacked for installation and replacement in locations that can be mounted and removed by simply opening the upper cover. The utility model has the following simple and reasonable features, making the microgrid battery energy storage integrated device easy to manufacture and low-cost, and convenient to operate and maintain after installation and use, with rapid and timely fault diagnosis and processing, which is conducive to improving the use effect and promoting its application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural diagram of an embodiment of the utility model.

[0017] Figure 2 yes Figure 1 BB view.

[0018] Figure 3 yes Figure 1 AA view of the .

[0019] Figure 4 yes Figure 1 CC view.

[0020] Reference numerals:

[0021] 001—Frame

[0022] 002—Front panel

[0023] 003—Rear Panel

[0024] 004—Right side panel

[0025] 005—Left side panel

[0026] 006—Right bulkhead

[0027] 007—Left bulkhead

[0028] 008—Middle partition

[0029] 009—Front Panel

[0030] 010—Upper cover

[0031] 011—Lower cover

[0032] 012—AC box

[0033] 013—Converter Box

[0034] 014—DC box

[0035] 015—Voltage upper chamber

[0036] 016—Variation chamber

[0037] 017—Flow conversion chamber

[0038] 018—EMS plug-in box guide shell

[0039] 019—PCS plug-in box guide shell

[0040] 020—BMS plug-in box guide shell

[0041] 021—EMS plug box

[0042] 022—PCS plug box

[0043] 023—BMS plug-in box

[0044] 024—Connecting copper parts

[0045] 025—Connecting fasteners

[0046] 101—Circuit board after the housing is guided

[0047] 102—Conductor shell connected to the socket

[0048] 103—Plug-in box and plug

[0049] 104—Plug-in box panel

[0050] 105—Fasten nut

[0051] 106—Tightening bolts

[0052] 107—Restriction Circle

[0053] 108—Plug-in box hole

[0054] 109—Functional circuit board

[0055] 110—Working status indicator light

[0056] 111—Debug communication interface

[0057] 112—Conductor shell external connection connector

[0058] 113—Anti-interference magnetic ring

[0059] 201—AC primary circuit

[0060] 202—AC input terminal

[0061] 203—AC circuit breaker

[0062] 204—AC fuse

[0063] 205—AC interface

[0064] 206—AC circuit breaker operating handle

[0065] 301—Converter Primary Circuit

[0066] 302—Filter reactance components

[0067] 303—Energy storage capacitor components

[0068] 304—IGBT components

[0069] 305—Converter Interface

[0070] 401—DC primary circuit

[0071] 402—DC input terminal block

[0072] 403—DC circuit breaker

[0073] 404—DC fuse

[0074] 405—DC relay

[0075] 406—DC interface

[0076] 407—DC circuit breaker operating handle DETAILED DESCRIPTION

[0077] A structure for a microgrid battery energy storage integrated device that is easy to operate and maintain is characterized by comprising: a steel machine frame 001, a front panel 009, an upper cover 010, and a lower cover 011. The machine frame 001 is welded together by a front panel 002, a rear panel 003, a right side panel 004, a left side panel 005, a right partition 006, a left partition 007, and a middle partition 008. The front panel 009 is installed in front of the machine frame 001, and the upper cover 010 is installed at the upper end and the lower cover 011 is installed at the lower end. The right partition 006 and the left partition 007 divide the machine frame 001 into an AC box 012, a converter box 013, and a DC box 014 vertically. The middle partition 008 is shorter and connected to the rear panel 003, and divides the converter box 013 into an upper converter chamber 015, a lower converter chamber 016, and a front converter chamber 017. The chassis is divided into three compartments based on the device's three main functions, and the converter box is divided into three compartments based on its three main components, making fault diagnosis and troubleshooting easier. The right, left, and center partitions divide the space and secure the devices and components, while also providing thermal and electromagnetic interference insulation, improving operational stability and reliability.

[0078] EMS secondary components are installed in the metal pluggable EMS plug box 021, PCS secondary components are installed in the metal pluggable PCS plug box 022, and BMS secondary components are installed in the metal pluggable BMS plug box 023; there are metal EMS plug box guide shell 018, PCS plug box guide shell 019, and BMS plug box guide shell 020. EMS plug box guide shell 018 is fixed in the AC box 012. At the front of right bulkhead 006, PCS plug-in box guide housing 019 is located inside converter box 013 and fixed to the lower portion of converter front chamber 017. BMS plug-in box guide housing 020 is located inside DC box 014 and fixed to the front of left bulkhead 007. EMS plug-in box guide housing 018, PCS plug-in box guide housing 019, and BMS plug-in box guide housing 020 contain push-pull plug-in and unpluggable EMS plug-in box 021, PCS plug-in box 022, and BMS plug-in box 023, respectively. A microgrid battery energy storage system is a highly complex electrical, electronic, and microelectronic device, comprising hundreds or even thousands of components, over 95% of which are small and micro-sized electronic and microelectronic components. During the operation of the device, the vast majority of failures are caused by quality issues with these numerous and diverse electronic and microelectronic components. Therefore, these components are installed according to their functional assembly functions within the metal, pluggable EMS, PCS, and BMS plug-in boxes 021, 022, and 023. This allows the majority of failures in the microgrid battery energy storage complex to be contained within these three plug-in boxes. This enables modular operation and maintenance, with plug-in replacement options enabled by the metal boxes. The metal boxes provide heat dissipation and electromagnetic interference resistance, while the EMS, PCS, and BMS plug-in box guides 018, 019, and 020 provide plug-in guidance. The metal material is flame-retardant, thermally conductive, and magnetically isolating, improving operational reliability. EMS, PCS, BMS plug-in boxes 021, 022, 023 are respectively installed in AC box 012, converter box 013, DC box 014 which are connected to primary devices (circuits) of EMS, PCS, BMS plug-in boxes, shortening the length of the connecting lines and improving the reliability of information transmission.

[0079] The rear panel of the EMS plug box guide housing 018, PCS plug box guide housing 019, and BMS plug box guide housing 020 is a guide housing rear circuit board 101, on which there is a guide housing rear connection socket 102; the insertion end of the EMS plug box 021, PCS plug box 022, and BMS plug box 023 has a plug box connector 103 corresponding to the guide housing rear connection socket 102, and the other end has a plug box panel 104; the area of the plug box panel 104 is slightly larger than the cross-sectional area of the plug boxes 021, 022, and 023; there are two fastening nuts 100 on the longitudinal sides of the open ends of the plug box guide housings 018, 019, and 020. 5. The plug box panel 104 has two fastening bolts 106 corresponding to the fastening nuts 105, and the fastening bolts 106 have a limiting ring 107; the front panel 009 has plug box holes 108 corresponding to the open ends of the plug box guide shells 018, 019, and 020. After the end of the plug 103 of the plug boxes 021, 022, and 023 is inserted into the plug box hole 108, a screwdriver is used to tighten the fastening bolts 106 and the fastening nuts 105, thereby inserting the plug 103 of the plug box into the guide shell and then connecting to the socket 102, and thus fixing the plug boxes 021, 022, and 023 to the plug box guide shells 018, 019, and 020. To remove plug-in boxes 021, 022, or 023 from plug-in box guide housings 018, 019, or 020 during maintenance, first use a screwdriver to remove the fastening bolts 106 from the fastening nuts 105. Then, manually pull on the plug-in box panel 104 to remove the plug-in boxes 021, 022, or 023. The plug-in box connector 103 and the guide housing rear connector receptacle 102 work together to disconnect the plug-in boxes 021, 022, or 023 from external wiring when they are removed. To ensure reliable connection, manually inserting or removing the plug-in box connector 103 into or from the guide housing rear connector receptacle 102 is difficult. The function of the fastening nut 105, the fastening bolt 106 and the limiting ring 107 is to conveniently insert or withdraw the plug 103 of the plug box into or from the guide housing rear connection socket 102 by turning the fastening bolt 106 with the help of a screwdriver.

[0080] The EMS, PCS, and BMS plug-in boxes 021, 022, and 023 are respectively equipped with EMS, PCS, and BMS functional circuit boards 109; the plug-in box panel 104 is provided with corresponding working status indicator lights 110 and a debugging communication interface 111 for debugging. A faulty plug-in box can be quickly identified by observing the status indicator lights 110 on the plug-in box front panel 026 and using the debugging communication interface 111. Faulty plug-in boxes 021, 022, or 023 are handled by replacing them with faulty plug-in boxes. That is, at the device's operating site, the device can remain on the shelf. The faulty plug-in box 021, 022, or 023 can be removed online using a screwdriver and then replaced with a spare fault-free plug-in box. Fault identification and handling are timely and rapid, and faulty plug-in boxes are repaired offline.

[0081] The AC box 012 contains an AC primary circuit 201, the converter box 013 contains a converter primary circuit 301, and the DC box 014 contains a DC primary circuit 401. The AC primary circuit 201 is composed of an AC input terminal 202 installed on the front plate 002 or the front panel 009 and an AC circuit breaker 203 and an AC fuse 204 behind the front plate 002, which are connected by connecting copper pieces 024 and connecting fasteners 025. The AC fuse 204 is located at the upper cover 010 of the AC box 012 for loading and unloading. The operating handle 206 of the AC circuit breaker 203 is installed on the front panel 009. The converter primary circuit 301 is composed of a filter reactance component 302 installed in the converter upper chamber 015, an energy storage capacitor component 303 installed in the converter lower chamber 016, and an IGBT component 304 installed in the converter front chamber 017, which are connected by connecting copper pieces 024 and connecting fasteners 025. Circuit 401 is composed of DC input terminals 402 mounted on front panel 002 or front panel 009, and a DC circuit breaker 403, a DC fuse 404, and a DC relay 405 behind front panel 002, connected using connecting copper fittings 024 and connecting fasteners 025. DC fuse 404 and DC relay 405 are located at the top of DC box 014, where they can be removed and replaced by opening upper cover 010. The operating handle 407 of DC circuit breaker 403 is mounted on front panel 009. The AC primary circuit 201 is connected to the filter reactor component 302 using connecting copper fittings 024 and connecting fasteners 025, and the DC main circuit 401 is connected to the energy storage capacitor component 303 using connecting copper fittings 024 and connecting fasteners 025. The AC primary circuit 201 is equipped with an AC interface 205, the current conversion primary circuit 301 is equipped with a current conversion interface 305, and the DC primary circuit 401 is equipped with a DC interface 406. Based on the device's bidirectional conversion characteristics (AC to DC and DC to AC), the AC and DC boxes are placed on either side of the converter box. The AC input terminals 202 and AC circuit breaker operating handle 206, required for operation and maintenance of the AC primary circuit, are mounted on the front panel 002 and front panel 009. The AC circuit breaker 204 is located above the AC box 012, where it can be removed and replaced by opening the upper cover 010, facilitating operation and maintenance. Based on the primary function of the device's PCS, the primary components are packaged separately in the filter reactor 302, energy storage capacitor 303, and IGBT 304. These components are then installed in the converter upper chamber 015, converter lower chamber 016, and converter front chamber 017, respectively, based on their heat generation, electromagnetic compatibility, and interconnectivity. This results in a simple structure, ease of operation and maintenance, and high operational reliability. The DC input terminal 402 and the DC circuit breaker operating handle 407 involved in the operation and maintenance of the DC primary circuit are installed on the front plate 002 and the front panel 009. The DC fuse 404 and the DC relay 405 are located at the upper cover 010 on the DC box 014 for loading and unloading, which is convenient for operation and maintenance.

[0082] The outer-shell connector 112 is located on the rear circuit board 101 of the guide housing. The outer-shell connector 112 on the rear circuit board 101 of the EMS plug-in box guide housing 018 has a wire or cable passing through a long anti-interference magnetic ring 113 to connect to the AC primary circuit 201 or AC interface 205. The outer-shell connector 112 on the rear circuit board 101 of the PCS plug-in box guide housing 019 has a wire or cable passing through a long anti-interference magnetic ring 113 to connect to the converter primary circuit 301 or converter interface 305. The outer-shell connector 112 on the rear circuit board 101 of the BMS plug-in box guide housing 020 has a wire or cable passing through a long anti-interference magnetic ring 113 to connect to the DC primary circuit 401 or DC interface 406. The EMS secondary circuit in the EMS plug-in box 021 collects information such as the equipment's stored energy from the AC primary circuit 201 to manage the safe and economical operation of energy storage charging and discharging. The PCS secondary circuit in PCS plug-in box 022 collects DC and AC voltage and current information from converter circuit 301 to convert AC power into DC power and vice versa. The BMS secondary circuit in BMS plug-in box 023 collects energy storage battery voltage, current and other information from DC primary circuit 401 to manage the safe and economical operation of the energy storage battery.

Claims

1. A structure for facilitating operation and maintenance of a microgrid battery energy storage integrated device, characterized by comprising: Steel machine frame (001), front panel (009), upper cover (010), lower cover (011), the machine frame (001) is welded by front panel (002), rear panel (003), right side panel (004), left side panel (005), right partition (006), left partition (007), and middle partition (008); the machine frame (001) is installed with front panel (009), the upper end is installed with upper cover (010), and the lower end is installed with lower cover (011); the right partition (006) and the left partition (007) divide the machine frame (001) into AC box (012), converter box (013), and DC box (014) longitudinally; the middle partition (008) is shorter and connected to the rear panel (003) and divides the converter box (013) into converter upper chamber (015), converter lower chamber (016), and converter front chamber (017); The EMS secondary device is installed in a pluggable EMS plug-in box (021) made of metal, the PCS secondary device is installed in a pluggable PCS plug-in box (022) made of metal, and the BMS secondary device is installed in a pluggable BMS plug-in box (023) made of metal; there are a metal EMS plug-in box guide shell (018), a PCS plug-in box guide shell (019), and a BMS plug-in box guide shell (020), and the EMS plug-in box guide shell (018) is located in the AC box (012) and fixed to the right partition ( 006), the PCS plug box guide housing (019) is located in the converter box (013) and fixed at the lower part of the converter front chamber (017), and the BMS plug box guide housing (020) is located in the DC box (014) and fixed at the front part of the left partition (007); the EMS plug box guide housing (018), the PCS plug box guide housing (019), and the BMS plug box guide housing (020) respectively have push-pull plug-in and unplug-in EMS boxes (021), PCS plug box (022), and BMS plug box (023); The rear plate of the EMS plug box guide shell (018), PCS plug box guide shell (019), and BMS plug box guide shell (020) is a guide shell rear circuit board (101), and a guide shell rear connection socket (102) is provided on the guide shell rear circuit board (101); the insertion end of the EMS plug box (021), PCS plug box (022), and BMS plug box (023) has a plug box connection plug (103) corresponding to the guide shell rear connection socket (102), and the other end has a plug box panel (104); the area of the plug box panel (104) is slightly larger than the cross-sectional area of the plug box (021, 022, 023); the longitudinal sides of the open end of the plug box guide shell (018, 019, 020) are provided with two fastening nuts (10 5), the plug box panel (104) has two fastening bolts (106) corresponding to the fastening nut (105), and a limiting ring (107) is provided on the fastening bolt (106); the front panel (009) has a plug box hole (108) corresponding to the open end of the plug box guide shell (018, 019, 020), and the plug box (021, 022, 023) has one end of the connector (103) inserted into the connector hole (108) and then tightened with the fastening bolt (106) and the fastening nut (105), thereby inserting the plug box connector (103) into the guide shell and then connecting the socket (102), and thus fixing the plug box (021, 022, 023) to the plug box guide shell (018, 019, 020); A housing external connection connector (112) is provided on the housing rear circuit board (101); the housing external connection connector (112) on the housing rear circuit board (101) of the EMS plug-in box housing (018) has a wire or cable passing through a long anti-interference magnetic ring (113) and is connected to an AC primary circuit (201) or an AC interface (205); the housing external connection connector (112) on the housing rear circuit board (101) of the PCS plug-in box housing (019) has a wire or cable passing through a long anti-interference magnetic ring (113) and is connected to a current conversion primary circuit (301) or a current conversion interface (305); the housing external connection connector (112) on the housing rear circuit board (101) of the BMS plug-in box housing (020) has a wire or cable passing through a long anti-interference magnetic ring (113) and is connected to a DC primary circuit (401) or a DC interface (406).

2. The structure for facilitating operation and maintenance of a microgrid battery energy storage integrated device according to claim 1 is characterized by: The AC box (012) has an AC primary circuit (201), the converter box (013) has a converter primary circuit (301), and the DC box (014) has a DC primary circuit (401); the AC primary circuit (201) is formed by connecting the AC input terminal (202) installed on the front plate (002) or the front panel (009) and the AC circuit breaker (203) and AC fuse (204) behind the front plate (002) using connecting copper parts (024) and connecting fasteners (025). The AC fuse (204 ) is located at the upper part of the AC box (012) where the upper cover (010) can be opened and removed for replacement; the AC circuit breaker operating handle (206) is installed on the front panel (009); the primary circuit (301) of the converter is composed of a filter reactance component (302) installed in the upper converter chamber (015), an energy storage capacitor component (303) installed in the lower converter chamber (016), and an IGBT component (304) installed in the front converter chamber (017), which are connected using connecting copper parts (024) and connecting fasteners (025); the primary circuit ( 401) is composed of a DC input terminal (402) mounted on the front plate (002) or the front panel (009) and a DC circuit breaker (403), a DC fuse (404), and a DC relay (405) behind the front plate (002) connected by connecting copper pieces (024) and connecting fasteners (025). The DC fuse (404) and the DC relay (405) are located at the upper part of the DC box (014) where the upper cover (010) can be opened and removed for replacement. The DC circuit breaker operating handle (407) is mounted on the front On the board (009); the AC primary circuit (201) is connected to the filter reactance component (302) using a connecting copper piece (024) and a connecting fastener (025); the DC primary circuit (401) is connected to the energy storage capacitor component (303) using a connecting copper piece (024) and a connecting fastener (025); the AC primary circuit (201) is equipped with an AC interface (205), the current conversion primary circuit (301) is equipped with a current conversion interface (305), and the DC primary circuit (401) is equipped with a DC interface (406).

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