Water-cooled power unit based on 4500V 2000A PP-IGBT structural form

Abstract

The utility model relates to the field of power units, in particular to a water-cooling power unit based on a 4500V2000A PP-IGBT structural form, which comprises a power module, a capacitor, a composite busbar module and a base, the power module, the composite busbar module and the capacitor are sequentially arranged on the base, and the capacitor is fixedly connected with the composite busbar module. The power module is fixedly connected with the composite busbar module. The utility model has the advantages that the power module, the composite busbar module and the capacitor are sequentially arranged on the base, the composite busbar module is respectively connected with the capacitor and the base, and the power module is respectively connected with the composite busbar module and the base through bolts, so that the disassembly is convenient, the production efficiency is improved, and the maintenance is easy; the copper bars are connected with the IGBT modules and the bypass contactors, no switching bar is used, the copper bars are saved, and the height and depth of the water-cooling power unit are reduced; the second reinforcing ribs are connected with the first reinforcing beams, the two unit stand column reinforcing beams are connected with the two second reinforcing ribs, and the installation strength of the fixed power source module and the trigger plate module is improved.

Description

Technical Field

[0001] This utility model relates to the field of power units, and in particular to a water-cooled power unit based on a 4500V2000APP-IGBT structure. Background Technology

[0002] Static var generators (SVAs) play a crucial role in improving power quality in power systems. With the rapid growth of new energy sources, the requirements for power quality are becoming increasingly stringent. Complete sets of static var generator equipment have been widely used in large wind farms, photovoltaic power plants, steel mills, and other applications. Taking a conventional 4500V 2000APP-IGBT structure as an example, the power unit of a typical static var generator consists of an IGBT module, a circuit board module, and water pipes, all of which are independently placed and not integrated into a single power module. It requires one capacitor and the production of three types of composite busbars. The three composite busbars are then combined... (See...) Figure 7 One end of the two types of composite busbars 47 and the three types of composite busbars 48 is connected to one type of composite busbar 46, and the other end of the two types of composite busbars 47 and the three types of composite busbars 48 are connected to the IGBT module. The composite busbar 46 is connected to a capacitor. The fact that it is not integrated into a power module and a single capacitor results in a large power unit size, which is not easy to move and hoist, and the installation cycle is long. The three types of composite busbars increase costs and waste materials, resulting in complex and costly installation of the static var generator, as well as a large footprint and volume. The single capacitor connecting the three types of composite busbars causes uneven temperature distribution and localized high temperatures, which can easily burn out the composite busbars. This poses safety hazards during commissioning and equipment operation. Due to the large footprint of the equipment, it is difficult to inspect equipment that is far from the inspection channel, which is not conducive to daily inspection. Utility Model Content

[0003] The purpose of this invention is to provide a water-cooled power unit based on a 4500V 2000APP-IGBT structure. The power module and capacitor can be separated separately, which is low-cost, compact, small in size, and easy to install and maintain.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] A water-cooled power unit based on a 4500V 2000APP-IGBT structure is disclosed. The water-cooled power unit includes a power module, a capacitor, a composite busbar module, and a base. The power module, composite busbar module, and capacitor are sequentially arranged on the base. The capacitor is fixedly connected to the composite busbar module, and the power module is fixedly connected to the composite busbar module.

[0006] The composite busbar module includes two composite busbars with identical structures, Composite Busbar 1 and Composite Busbar 2. Composite Busbar 1 and Composite Busbar 2 are U-shaped. The bottom edge of Composite Busbar 1 and Composite Busbar 2 are fixedly connected by a busbar baffle. Both Composite Busbar 1 and Composite Busbar 2 include positive and negative copper busbars, which are insulated from each other by an insulating plate. One side of Composite Busbar 1 and Composite Busbar 2 is fixedly connected to a power module, and the other side of Composite Busbar 1 and Composite Busbar 2 is fixedly connected to a capacitor.

[0007] The power module is set inside the power module frame, which is a square frame composed of an upper frame connecting part 24, a lower frame connecting part 27, and columns. The lower end of the power module frame is provided with the lower frame connecting part 27, and the upper end of the power module frame is provided with the upper frame connecting part 24. A column is provided between the upper frame connecting part 24 and the lower frame connecting part 27. A support frame one is horizontally fixed between the columns, and a support frame two is fixed on the support frame one. The support frame two and the support frame one are perpendicular to each other.

[0008] The power module includes an IGBT module 11, a bypass contactor 13, and a resistor module 16. The columns include parallel front columns 28, 26, 30, and 29. The bypass contactor 13 is fixedly connected to the lower connection part 27 of the frame. The top of the IGBT module 11 is fixedly connected to the upper connection part 24 of the frame. The bottom of the IGBT module 11 is fixedly connected to the lower connection part 27 of the frame. The resistor module 16 is fixedly connected to the IGBT module 11. The bypass contactor 13 and the IGBT module 11 are connected by a copper busbar 12.

[0009] The power module also includes a power supply module 7, a trigger board module 9, a control board module 6, and a protection board module 15. One end of the power supply module 7 is fixedly connected to the first unit front column 28 and the second unit front column 26, and the other end of the power supply module 7 is fixedly connected to the second support frame. One end of the trigger board module 9 is fixedly connected to the first unit front column 28 and the second unit front column 26, and the other end of the trigger board module 9 is fixedly connected to the second support frame. The first support frame is fixedly equipped with the control board module 6 and the protection board module 15. One end of the control board module 6 is fixedly connected to the second unit front column 26 and the first unit front column 28.

[0010] The power module also includes an inlet pipe and an outlet pipe. The inlet pipe and the outlet pipe are fixedly connected to the lower connection part 27 of the frame by the pipe bracket 22. The IGBT module 11 is fixedly connected to the outlet pipe through the water pipe 17 and the IGBT module 11 is fixedly connected to the inlet pipe through the water pipe 19.

[0011] The IGBT module 11 is set inside the IGBT module frame, which is a square frame composed of an upper pressure plate 31, a lower pressure plate 41, and a clamping plate 39. The bottom end of the IGBT module 11 rests against the lower pressure plate 41.

[0012] The IGBT module 11 includes an IGBT 37 and a water-cooled heat sink 38. The heat sink 38 and IGBT 37 are stacked alternately between insulating blocks 35. The heat sink 38 at both ends is provided with insulating blocks 35. The other side of the insulating blocks 35 at both ends is provided with an upper block 34 and a lower block 40, respectively.

[0013] The upper pressure plate 31 is provided with a disc spring guide sleeve 32. The upper pad 34 is placed between the insulating pad 35 and the disc spring guide sleeve 32. The top bolt 33 is screwed into the disc spring guide sleeve 32 until it touches the upper pad 34.

[0014] The IGBT module frame also includes a locking assembly that connects the upper pressure plate 31 and the lower pressure plate 41, and the disc spring guide sleeve 32 maintains the pressure within the range required by the IGBT 37.

[0015] The other end of the copper busbar 12 extends out of the power module frame for multiple water-cooled power units of the static var generator to be connected in series.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The power module, composite busbar module, and capacitor are installed on the base in sequence. The composite busbar module is connected to the capacitor and the base respectively, and the power module is bolted to the composite busbar module and the base respectively. This makes disassembly convenient, improves production efficiency, and is easy to maintain.

[0018] 2. The copper busbar is connected to the IGBT module and bypass contactor. The absence of an adapter busbar saves copper busbars, reduces costs, and decreases the height and depth of the water-cooled power unit.

[0019] 3. Reinforcing rib 2 is connected to reinforcing beam 1. The two unit column reinforcing beams are connected to the two reinforcing ribs 2 to increase the installation strength of the fixed power supply module and trigger plate module.

[0020] 2. Both composite busbar one and composite busbar two include positive and negative copper busbars, which are insulated from each other by an insulating plate. One side of composite busbar one and composite busbar two is fixedly connected to the power module, and the other side of composite busbar one and composite busbar two is fixedly connected to the capacitor, which increases the overlapping part of the copper busbars and reduces stray inductance.

[0021] 3. IGBT module 11. Various board modules and water pipes are set inside the power module, making its structure more compact and facilitating on-site disassembly and replacement;

[0022] 4. The support frame is fixedly equipped with a control board module 6 and a protection board module 15. One end of the control board module 6 is fixedly connected to the second front column 26 and the first front column 28 of the unit, reducing the width and depth of the power module. One end of the power module 7 is fixedly connected to the second front column 26 and the first front column 28 of the unit, and the other end of the power module 7 is fixedly connected to the support frame. One end of the trigger board module 9 is fixedly connected to the first front column 28 and the second front column 26 of the unit, and the other end of the trigger board module 9 is fixedly connected to the support frame, reducing the depth of the power module and making the water-cooled power unit structure more compact.

[0023] 5. The top of the IGBT module 11 is fixedly connected to the upper frame connection part 24, making it more robust and stable. The bottom of the IGBT module 11 is fixedly connected to the lower frame connection part 27, which serves to fix it and also reduces the height of the power module; the resistor module 16 is fixedly connected to the IGBT module 11, which can better dissipate heat from the resistor and greatly reduce the failure rate of the resistor.

[0024] 6. The inlet and outlet pipes are fixedly connected to the lower connection part 27 of the frame by the pipe bracket 22. When the power unit is working, the water inlet and outlet will cause impact and vibration on the water pipe. This connection is more secure, eliminates vibration and prevents the water pipe from loosening.

[0025] 7. The use of two capacitors in parallel saves the composite busbar and reduces stray inductance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the water-cooled power unit structure.

[0027] Figure 2 This is the right view of the power module;

[0028] Figure 3 This is the left view of the power module;

[0029] Figure 4 This is a schematic diagram of the power module frame structure.

[0030] Figure 5 This is a schematic diagram of the IGBT module structure.

[0031] Figure 6 This is a schematic diagram of the composite busbar module structure.

[0032] Figure 7 This is a schematic diagram of the composite busbar structure before the modification.

[0033] In the diagram: 1-Power Module; 2-Composite Busbar Module; 3-Capacitor; 4-Base; 5-Handle; 6-Control Board Module; 7-Power Supply Module; 8-Unit Column Reinforcing Beam; 9-Trigger Board Module; 10-Reinforcing Rib II; 11-IGBT Module; 12-Copper Busbar; 13-Bypass Contactor; 14-PPH Water Pipe; 15-Protection Board Module; 16-Resistor Module; 17-Right Side FEP Water Pipe; 18-Power Module Frame; 19-Left Side FEP Water Pipe; 20-Top Panel; 21-Middle Panel; 22-Pipe Clamp; 23-Bottom Panel; 24-Frame Upper Connection Part; 25-Additional Components 26-Unit Front Column 2-Frame Lower Connection Part 28-Unit Front Column 1 29-Unit Rear Column 2 30-Unit Rear Column 1 31-Upper Pressure Plate 32-Disc Spring Guide Sleeve 33-Top Bolt 34-Upper Pad Block 35-Insulating Pad Block 36-Explosion-proof Plate 37-IGBT 38-Water Cooling Radiator 39-Clamping Plate 40-Lower Pad Block 41-Lower Pressure Plate 42-Busbar Baffle 43-Resin Fastener 44-Composite Busbar 2 45-Composite Busbar 1 46-One Type of Composite Busbar 47-Two Types of Composite Busbar 48-Three Types of Composite Busbar Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0035] The following embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0036] Example 1

[0037] After the modification, the IGBT module, board module, and water pipes are all integrated into the power module. Two capacitors are connected in parallel to reduce the weight of a single capacitor and make it easier to install and remove the capacitor. The connection method of combining three composite busbars together is eliminated. Instead, composite busbar modules are connected to the power module and capacitors respectively, saving composite busbars.

[0038] A water-cooled power unit based on a 4500V 2000A PP-IGBT structure, see Figure 1 The water-cooled power unit includes a power module 1, a composite busbar module 2, a capacitor 3, and a base 4. The capacitor 3 is bolted to the base 4. The composite busbar module 2 is bolted to both the capacitor 3 and the base 4. The power module 1 is bolted to both the composite busbar module 2 and the base 4. This design facilitates installation and improves production efficiency.

[0039] See Figure 2The right view of the power module shows that handle 5 is bolted to the upper connecting part 24 of the frame, and bypass contactor 13 is bolted to the lower connecting part 27 of the frame, which reduces the height of the unit module. Copper busbar 12 is bolted to IGBT module 11 and bypass contactor 13; eliminating the need for an adapter busbar saves copper busbar costs and reduces height and depth. Two reinforcing ribs 10 are bolted to reinforcing beam 25, and two unit column reinforcing beams 8 are bolted to two reinforcing ribs 10, used to increase the fixation of the power module 7 and trigger. The strength of board module 9 is enhanced; power module 7, two trigger board modules 9 are bolted to unit front column 26, unit front column 28, and two reinforcing ribs 10; control board module 6 is bolted to two reinforcing beams 25, unit front column 26, and unit front column 28; protection board module 15 is bolted to IGBT module 11; PPH water pipe 14 is fixed to the lower connection part 27 of the frame with pipe clamp 22; the right-side FEP water pipe 17 is connected to IGBT module 11 and PPH water pipe 14. Bolting resistor module 16 to IGBT module 11 improves resistor heat dissipation and significantly reduces resistor failure rate.

[0040] See Figure 3 The power module includes an inlet pipe and an outlet pipe, which are fixedly connected to the lower connection part 27 of the frame. The IGBT module 11 is fixedly connected to the outlet pipe through the water pipe 17 and to the inlet pipe through the water pipe 19. The water pipes are connected in series, which saves water pipes, eliminates the main water pipe of the unit, reduces the depth, and lowers the cost.

[0041] The cables include cables connecting the power module, control board module 6, power supply module 7, trigger board module 9, protection board module 15, and resistor module 16. Cable connections include those between power supply module 7 and capacitor 3, control board module 6, trigger board module 9, and protection board module 15; between control board module 6 and IGBT 37; between control board module 6 and other control board modules; and between control board module 6 and protection board module 15. The top panel 20, middle panel 21, bottom panel 23, side panels, and cover are installed. To reduce the depth of the power unit, a portion of the front of the side panel near the copper busbar 12 is removed to ensure the insulation distance of the busbars connecting multiple units of the static var generator in series.

[0042] See Figure 6The composite busbar module includes composite busbar 1 45 and composite busbar 2 44 with identical structures. Composite busbar 1 45 and composite busbar 2 44 are U-shaped. The bottom edge of composite busbar 1 45 and the bottom edge of composite busbar 2 44 are fixedly connected to busbar baffle 42 by resin fasteners 43. Busbar baffle 42 is used to prevent the busbar from exploding and damaging other surrounding devices due to excessive electric force or misoperation. Both composite busbar 1 45 and composite busbar 2 44 include positive and negative copper busbars, which are insulated from each other by an insulating plate. One side of composite busbar 1 and composite busbar 2 is fixedly connected to the power module, and the other side of composite busbar 1 and composite busbar 2 is fixedly connected to the capacitor 3.

[0043] Example 2

[0044] In this embodiment, a water-cooled power unit based on a 4500V2000A PP-IGBT structure is the same as in Embodiment 1, except that an IGBT module structure is added to it.

[0045] See Figure 5 The upper pressure plate 31, two clamping plates 39, and the lower pressure plate 41 are assembled together by bolts to form the IGBT module frame. Check the frame's squareness. Place the lower pad 40 on the lower pressure plate 41, and place the insulating pad 35 on the lower pad 40. Place the five heat sinks 38 and four IGBTs 37 alternately on the insulating pad 35, with the "C" terminals of the two lower IGBTs 37 facing downwards and the "C" terminals of the two upper IGBTs 37 facing upwards. Place the insulating pad 35 on top of the uppermost heat sink 38. Insert the disc spring guide sleeve 32 from inside the IGBT mounting frame into the upper pressure plate 31 and hold it in place to prevent it from falling. Place the upper pad 34 between the insulating pad 35 and the disc spring guide sleeve 32. Release your hand and gently place the disc spring guide sleeve 32 on the upper pad 34. Tighten the top bolt 33 into the disc spring guide sleeve 32 until it touches the upper pad 34. Tighten the top bolt 33 with a torque wrench until the required tightening torque for the IGBT is reached. Connect the two explosion-proof plates 36 to the heat sinks 38 with bolts to prevent the IGBTs 37 from bursting and damaging the water pipes. The IGBT module 11 is now assembled.

[0046] Example 3

[0047] In this embodiment, a water-cooled power unit based on a 4500V2000A PP-IGBT structure is the same as in Embodiment 1, except that a power module frame structure is added on the basis of Embodiment 1 and / or Embodiment 2.

[0048] See Figure 4The power module frame is a square frame composed of an upper frame connecting part 24, a lower frame connecting part 27, and columns. The lower end of the power module frame has a lower frame connecting part 27, and the upper end has an upper frame connecting part 24. A column is positioned between the upper frame connecting part 24 and the lower frame connecting part 27. A support frame 1 is horizontally fixed between the columns, and a support frame 2 is fixed on the support frame 1, with the support frame 2 perpendicular to the support frame 1. The support frame 1 includes a reinforcing beam 25, and the support frame 2 includes reinforcing ribs 10 and unit column reinforcing beams 8. Two reinforcing ribs 10 are bolted to the reinforcing beam 25, and two unit column reinforcing beams 8 are bolted to the two reinforcing ribs 10. The IGBT module 11 is directly bolted to the lower frame connecting part 27, thus reducing the overall height of the unit module. The front unit column 26, the front unit column 1 28, the rear unit column 29, and the rear unit column 1 30 are bolted to the lower frame connecting part 27. The frame connection 24 is bolted to the second front column 26, the first front column 28, the second rear column 29, and the first rear column 30 of the unit; the two reinforcing beams 25 are bolted to the second front column 26, the first front column 28, the second rear column 29, and the first rear column 30 of the unit; the frame connection 24 is bolted to the IGBT module 11; the IGBT module 11 and the power module frame 18 are fixed, and the power module frame 18 is checked to be square; the bolt connection is easy to operate and can improve production efficiency.

[0049] This utility model features a power module, a composite busbar module, and a capacitor sequentially mounted on a base. The composite busbar module is connected to both the capacitor and the base, while the power module is bolted to both the composite busbar module and the base. This design facilitates easy disassembly, improves production efficiency, and enhances maintenance. Copper busbars connect to the IGBT module and bypass contactor, eliminating the need for adapters and saving copper busbars, thus reducing costs and decreasing the height and depth of the water-cooled power unit. Reinforcing rib two connects to reinforcing beam one, and connecting the two unit column reinforcing beams to the two reinforcing ribs two increases the installation strength of the fixed power module and trigger plate module. Both composite busbar one and composite busbar two include positive and negative copper busbars, insulated from each other by an insulating plate. One side of composite busbar one and composite busbar two is fixedly connected to the power module, and the other side is fixedly connected to the capacitor, increasing the overlapping portion of the copper busbars. This design reduces stray inductance; the IGBT module 11, various board modules, and water pipes are housed within the power module, making its structure more compact and facilitating on-site disassembly and replacement; the support frame 1 is fixedly equipped with the control board module 6 and the protection board module 15, with one end of the control board module 6 fixedly connected to the unit front column 26 and the unit front column 1 28, reducing the width and depth of the power module; one end of the power module 7 is fixedly connected to the unit front column 26 and the unit front column 1 28, and the other end of the power module 7 is fixedly connected to the support frame 2; one end of the trigger board module 9 is fixedly connected to the unit front column 1 28 and the unit front column 26, and the other end of the trigger board module 9 is fixedly connected to the support frame 2, reducing the depth of the power module; making the water-cooled power unit structure more compact; the top of the IGBT module 11 is fixedly connected to the connecting part 24 on the frame, making it more robust and stable. The bottom of the IGBT module 11 is fixedly connected to the lower frame connection part 27, which serves a fixing function and also reduces the height of the power module; the resistor module 16 is fixedly connected to the IGBT module 11, which can better dissipate heat from the resistor and greatly reduce the failure rate of the resistor; the water inlet and outlet pipes are fixedly connected to the lower frame connection part 27 by the pipe bracket 22. When the power unit is working, the water inlet and outlet of the water pipe will cause impact and vibration to the water pipe. This connection is more secure and eliminates vibration to prevent the water pipe from loosening; the use of 2 capacitors in parallel saves the composite busbar and reduces stray inductance.

Claims

1. A water-cooled power unit based on the 4500V 2000A PP-IGBT structure form, characterized in that, The water-cooled power unit comprises a power module (1), a capacitor (3), a composite busbar module (2) and a base (4), the power module (1), the composite busbar module (2) and the capacitor (3) are sequentially arranged on the base (4), the capacitor (3) is fixedly connected with the composite busbar module (2), and the power module (1) is fixedly connected with the composite busbar module (2).

2. A water-cooled power unit based on the 4500V2000A PP-IGBT structure form according to claim 1, characterized in that, The composite busbar module (2) comprises composite busbar one (45) and composite busbar two (44) which are identical in structure, the composite busbar one (45) and the composite busbar two (44) are U-shaped, the bottom edges of the composite busbar one (45) and the composite busbar two (44) are fixedly connected through a busbar baffle (42), the composite busbar one (45) and the composite busbar two (44) each comprise positive and negative copper bars, the positive and negative copper bars are insulated through an insulating plate, one side edge of the composite busbar one (45) and the composite busbar two (44) is fixedly connected with the power module (1), and the other side edge of the composite busbar one (45) and the composite busbar two (44) is fixedly connected with the capacitor (3).

3. A water-cooled power unit based on the 4500V2000A PP-IGBT structure form according to claim 1, characterized in that, The power module (1) is arranged in a power module frame, the power module frame is a square frame composed of a frame upper connecting portion (24), a frame lower connecting portion (27) and columns, the lower end of the power module frame is provided with the frame lower connecting portion (27), the upper end of the power module frame is provided with the frame upper connecting portion (24), the frame upper connecting portion (24) and the frame lower connecting portion (27) are provided with the columns, horizontal supports one are fixed between the columns, horizontal supports two are fixed on the horizontal supports one, and the horizontal supports two and the horizontal supports one are perpendicular to each other.

4. A water-cooled power unit based on the 4500V 2000A PP-IGBT structure form according to claim 3, characterized in that, The power module (1) comprises an IGBT module (11), a bypass contactor (13) and a resistance module (16), the columns comprise unit front columns one (28) and two (26) and unit rear columns one (30) and two (29) which are parallel to each other, the bypass contactor (13) is fixedly connected with the frame lower connecting portion (27), the top of the IGBT module (11) is fixedly connected with the frame upper connecting portion (24), the bottom of the IGBT module (11) is fixedly connected with the frame lower connecting portion (27), the resistance module (16) is fixedly connected with the IGBT module (11), and the bypass contactor (13) and the IGBT module (11) are connected through a copper bar (12).

5. A water-cooled power cell based on the 4500V 2000A PP-IGBT structure form according to claim 4, characterized in that, The power module (1) further comprises a power supply module (7), a trigger plate module (9), a control plate module (6) and a protection plate module (15), one end of the power supply module (7) is fixedly connected with the unit front columns one (28) and two (26), the other end of the power supply module (7) is fixedly connected with the horizontal supports two, one end of the trigger plate module (9) is fixedly connected with the unit front columns one (28) and two (26), the other end of the trigger plate module (9) is fixedly connected with the horizontal supports two, and the horizontal supports one are fixedly provided with the control plate module (6) and the protection plate module (15), one end of the control plate module (6) is fixedly connected with the unit front columns two (26) and one (28).

6. A water-cooled power cell based on the 4500V 2000A PP-IGBT structure form according to claim 4, characterized in that, The power module (1) further comprises an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are fixedly connected with the lower connecting part (27) of the frame, the IGBT module (11) is fixedly connected with the outlet pipe through the right FEP water pipe (17), and the IGBT module (11) is fixedly connected with the inlet pipe through the left FEP water pipe (19).

7. A water-cooled power cell based on the 4500V 2000A PP-IGBT structure form according to claim 4, characterized in that, The IGBT module (11) is arranged in an IGBT module frame, the IGBT module frame is a square frame composed of the upper pressing plate (31), the lower pressing plate (41) and the clamping plate (39), and the bottom end of the IGBT module (11) abuts against the lower pressing plate (41).

8. A water-cooled power cell based on the 4500V 2000A PP-IGBT structure form according to claim 7, characterized in that, The IGBT module (11) comprises IGBTs (37) and water-cooled radiators (38), the water-cooled radiators (38) and the IGBTs (37) are staggered and stacked between the insulating pads (35), and the water-cooled radiators (38) at both ends are provided with the insulating pads (35), and the other sides of the insulating pads (35) at both ends are respectively provided with upper pads (34) and lower pads (40). The upper pressing plate (31) is provided with a disc spring guide sleeve (32), the upper pad (34) is arranged between the insulating pad (35) and the disc spring guide sleeve (32), and the jackscrew (33) is screwed into the disc spring guide sleeve (32) until the upper pad (34) is contacted.

9. A water-cooled power cell based on the 4500V 2000A PP-IGBT structure form according to claim 7, characterized in that, The IGBT module frame further comprises a locking assembly, the locking assembly connects the upper pressing plate (31) and the lower pressing plate (41), and the disc spring guide sleeve (32) keeps the pressure within the required range of the IGBT (37).

10. A water-cooled power unit based on 4500V 2000A PP-IGBT structure form according to claim 4, characterized in that, The other end of the copper bar (12) extends out of the power module frame.

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