Reactive power compensation device

Abstract

The utility model belongs to the field of power electronics, and discloses a reactive power compensation device, which realizes simplification of device assembly, is convenient for assembly line implementation, and comprises a substrate and a bypass switch unit, the substrate is provided with a bearing surface, and the bypass switch unit comprises a third shell and a bypass switch. The capacitor unit, the transduction unit and the bypass switch unit are sequentially and adjacently arranged on the bearing surface, the capacitor unit comprises a first shell and a compensation capacitor, the transduction unit comprises a second shell and a transduction assembly, the first shell and the second shell are mechanically coupled, and each of the first shell and the second shell is provided with a hoisting part; and the external hoisting device hoists the capacitor unit and the transduction unit through the hoisting part.

Description

Technical Field

[0001] The utility model belongs to the field of power electronics, and in particular relates to a reactive power compensation device. Background Art

[0002] With the continuous development of economy, the electricity consumption of industry and residents is increasing, and the application scale of high-power and variable-frequency electronic equipment is expanding, which causes the voltage fluctuation of the power grid and the reduction of power factor, thereby increasing the line loss and reducing the power supply quality. The reactive power compensation device (SVG, the same below) is designed to deal with this situation.

[0003] In the reactive power compensation device, the TSC (thyristor switched capacitor) type reactive power compensation device uses thyristors as the switching switches of capacitors. It includes an H-bridge power circuit, compensation capacitors, bypass switches and control modules corresponding to each component arranged on a water-cooled plate. The H-bridge power circuit is coupled with the external circuit through a supplementary capacitor. Compared with the traditional mechanical switching capacitor switch, it has the advantages of no impact, no inrush current and no transition process, and is therefore widely used in electronic systems.

[0004] At present, the two bridge arms of the H-bridge power circuit of the TSC type reactive power compensation device are respectively arranged on opposite sides of the water cooling plate, each bridge arm is coupled with the external circuit through an AC bus, and the number of bypass switches is at least one, which is arranged based on the AC bus to increase the compatibility of components.

[0005] However, with the widespread implementation, the disadvantages of this implementation method have gradually become apparent, specifically: 1. The overall mass of the device is large, which makes it inconvenient to move; 2. Since the installation orientation and installation position of the H-bridge power circuit, compensation capacitor, and bypass switch are different, the installation is complicated and difficult to implement on an assembly line; 3. The two bridge arms of the H-bridge power circuit pass strong currents, and various control modules pass weak currents. When the strong current and the weak current are close, electromagnetic interference will be generated, making the control module unable to operate stably. Therefore, during the design, only a predetermined distance can be maintained between the H-bridge power circuit and the control module, so that the structures are relatively loose, resulting in the inability to reduce the overall volume and low power density; 4. Since the IGBT of the H-bridge power circuit generates huge energy when it explodes, it is easy to damage the capacitor and nearby electronic components, and due to the hardware settings, it is difficult to simply introduce an explosion-proof structure. Utility Model Content

[0006] In view of the deficiencies of the prior art, the utility model provides a reactive power compensation device, which simplifies the assembly of the device and facilitates assembly line implementation by making the installation orientation and installation reference of the components basically unified.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A reactive power compensation device includes a capacitor unit and a transducer unit, characterized in that it includes: a substrate having a rectangular bearing surface, the bearing surface having an assembly length direction, a bypass switch unit, including a third shell and a bypass switch accommodated in the third shell, wherein the capacitor unit, the transducer unit and the bypass switch unit are arranged adjacent to each other in sequence on the bearing surface along the assembly length direction, the capacitor unit includes a first shell and a compensation capacitor accommodated in the first shell, the transducer unit includes a second shell and a transducer assembly accommodated in the second shell, the first shell and the second shell are mechanically coupled along the assembly length direction, the first shell and the second shell respectively have a hoisting portion, and an external hoisting device hoists the capacitor unit and the transducer unit through the hoisting portion.

[0009] Preferably, the bearing surface also has an assembly width direction formed relative to the assembly length direction, the energy conversion assembly includes a water-cooled plate, an H-bridge power circuit veneered on the water-cooled plate, and a laminated busbar assembly, the H-bridge power circuit is arranged on one side of the water-cooled plate along the assembly width direction, the H-bridge power circuit includes four IGBTs, the four IGBTs are arranged in a "field" shape, and the two IGBTs of the same bridge arm extend along the assembly length direction, the laminated busbar includes two AC plates, and the two AC plates are arranged corresponding to the two bridge arms.

[0010] Furthermore, the negative side of the H-bridge power circuit is close to the capacitor unit, and the laminated busbar assembly also includes a negative electrode plate coupled to the negative electrode of the H-bridge power circuit and a positive electrode plate coupled to the positive electrode of the H-bridge power circuit. The negative electrode plate, the positive electrode plate and the two AC plates are continuous in sequence along the assembly width toward the outside of the bearing surface and are stacked in three layers.

[0011] Furthermore, the utility model also includes a monitoring module, a transducer drive module and a bypass drive module. The transducer drive module, the transducer drive module and the bypass drive module are all arranged on one side of the water cooling plate along the assembly width, and the side and the H-bridge power circuit are respectively located on both sides of the water cooling plate.

[0012] Furthermore, the height of the third shell is smaller than the lower contour of the AC busbar, and the third shell has a monitoring opening opened to the outside.

[0013] Furthermore, the second shell includes a functional sub-shell and a basin-shaped sub-shell, the transducer assembly is accommodated inside the functional sub-shell, the basin-shaped sub-shell is located directly above the functional sub-shell, the water outlet of the water cooling plate is located inside the basin-shaped sub-shell, the functional sub-shell also has a water passage connected to the basin-shaped sub-shell, and the bottom of the substrate also has a drainage pipe connected to the water passage.

[0014] Furthermore, the utility model also includes a reinforced sheet metal part, wherein the top of the basin-shaped sub-shell forms two functional folded edges at both ends of the assembly length direction, and the top of the first shell has two functional groove plates at both ends of the assembly length direction, a functional folded edge and a functional groove plate that are far away from each other form a lifting part, and a functional folded edge and a functional groove plate that are close to each other are both threadedly connected to the reinforced sheet metal part.

[0015] Preferably, the utility model also includes a sliding assembly, including two sliding groove rails extending along the assembly length, the sliding groove rails support groove-shaped sheet metal with an opening facing upward, the sliding groove rail has an installation side wall, a coupling side wall and a plurality of sliding wheels all extending upward, the height of the installation side wall is smaller than the coupling side wall, the plurality of sliding wheels are all arranged on the installation side wall and are evenly arranged along the extension direction of the sliding groove rail, the bottom of the base plate has a reinforcing protrusion structure protruding downward and a coupling folded edge extending downward, the coupling folded edge has a coupling notch, the coupling side wall is inserted and fitted in the coupling notch, the wheel surface of the sliding wheel abuts against the bottom surface of the reinforcing protrusion structure, and when the sliding assembly is connected to the external mounting platform by threads, the base plate and the sliding assembly are rollingly connected.

[0016] Preferably, the bearing surface also has an assembly width direction formed relative to the assembly length direction, the substrate is a sheet metal part, and the substrate surface is formed with a positioning stop by cutting and flanging, and the positioning stop is used to form a stop for the first shell in the assembly length direction and / or the assembly width direction.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. Because the reactive power compensation device of the utility model includes a substrate and a bypass switch unit, the substrate has a bearing surface, the bypass switch unit includes a third shell and a bypass switch, the capacitor unit, the transducer unit and the bypass switch unit are arranged adjacent to each other in sequence on the bearing surface, the capacitor unit includes a first shell and a compensation capacitor, the transducer unit includes a second shell and a transducer assembly, the first shell and the second shell are mechanically coupled, the first shell and the second shell respectively have a lifting part, and the external lifting device lifts the capacitor unit and the transducer unit through the lifting part. Therefore, the capacitor unit, the transducer unit and the bypass switch unit of the utility model are all arranged on the bearing surface, and the capacitor unit and the transducer unit are coupled to form a whole, so that the capacitor unit and the transducer unit can be easily lifted and installed on the substrate through the lifting part, thereby simplifying the assembly of the device and facilitating the implementation of the assembly line.

[0019] 2. Because the bearing surface of the utility model also has an assembly width direction, the energy conversion assembly includes a water-cooled plate, an H-bridge power circuit veneered on the water-cooled plate, and a laminated busbar assembly. The H-bridge power circuit is arranged on one side of the water-cooled plate along the assembly width direction. The H-bridge power circuit includes four IGBTs, and the four IGBTs are arranged in a "field" shape. The two IGBTs in the same bridge arm extend along the assembly length direction. The laminated busbar includes two AC plates, and the two AC plates are arranged corresponding to the two bridge arms. Therefore, the utility model arranges the H-bridge power circuit on one side of the water-cooled plate so that the AC plate can cover the IGBT as a whole, so that the water-cooled plate and the AC plate form a relative covering on the IGBT from both sides, and then when the IGBT explodes due to an accident, the explosion energy will not affect the capacitor and nearby electronic components.

[0020] 3. Because the negative side of the H-bridge power circuit of the utility model is close to the capacitor unit, the laminated busbar assembly also includes a negative plate coupled to the negative electrode of the H-bridge power circuit and a positive plate coupled to the positive electrode of the H-bridge power circuit. The negative plate, the positive plate and the two AC plates are sequentially connected along the assembly width toward the outside of the bearing surface and are stacked in three layers. Therefore, the utility model uses the stacking arrangement of the positive and negative poles to partially cancel each other out due to the opposite directions of the generated stray inductances, thereby reducing the stray inductances in the transducer assembly, reducing the impact of the surge voltage when the power element is turned off, and reducing the distance between the negative plate and the capacitor unit, thereby reducing the commutation path, that is, the stray inductance is also reduced.

[0021] 4. Because the utility model also includes a monitoring module, an energy conversion drive module and a bypass drive module, the energy conversion drive module, the energy conversion drive module and the bypass drive module are all arranged on one side of the water-cooled plate along the assembly width, and the side and the H-bridge power circuit are respectively located on both sides of the water-cooled plate. Therefore, the utility model can spatially isolate the strong current components (IGBT) and the weak current components (various control modules) through the water-cooled plate, so that the structure can be designed to be more compact during design, thereby reducing the overall volume of the device and significantly improving the power density.

[0022] 5. Because the height of the third shell of the utility model is smaller than the lower contour of the AC panel, and the third shell has a monitoring opening open to the outside, the switch shell of the utility model can clearly monitor and operate the switch state of the bypass switch through the monitoring opening.

[0023] 6. Because the second shell of the utility model includes a functional sub-shell and a basin-shaped sub-shell, the basin-shaped sub-shell is located directly above the functional sub-shell, the water outlet of the water cooling plate is located inside the basin-shaped sub-shell, the functional sub-shell also has a water passage connected to the basin-shaped sub-shell, and the bottom of the base plate also has a drainage pipe connected to the water passage. Therefore, the utility model further reduces the probability of water leakage of the water cooling plate through the setting of the basin-shaped sub-shell.

[0024] 7. Because the utility model also includes a reinforced sheet metal, two functional folded edges are formed at both ends of the top of the basin-shaped sub-shell, and two functional slot plates are respectively provided at both ends of the top of the first shell. A functional folded edge and a functional slot plate that are far away from each other form a lifting part, and a functional folded edge and a functional slot plate that are close to each other are both threadedly connected to the reinforced sheet metal. Therefore, the setting of the two lifting parts makes the area between the capacitor unit and the transducer unit a stress concentration point during lifting. The utility model further fixes the coupling between the capacitor unit and the transducer unit by reinforcing the sheet metal.

[0025] 8. Because the utility model also includes a sliding assembly, including two sliding groove rails, the sliding groove rails support groove-shaped sheet metal with openings facing upward, the sliding groove rails have an installation side wall, a coupling side wall and a plurality of sliding wheels, the height of the installation side wall is smaller than the coupling side wall, the plurality of sliding wheels are all arranged on the installation side wall, and are evenly arranged along the extension direction of the sliding groove rail, the bottom of the base plate has a reinforcing protrusion structure and a coupling folded edge, the coupling folded edge has a coupling notch, the coupling side wall is inserted and fitted in the coupling notch, the wheel surface of the sliding wheel abuts against the bottom surface of the reinforcing protrusion structure, when the sliding assembly is connected to the external mounting platform by threads, the base plate and the sliding assembly are rollingly connected. Therefore, the utility model facilitates the movement of a heavier device as a whole on the external mounting platform by arranging a sliding assembly that is detachably arranged on the external mounting platform, that is, the reactive compensation device can be easily moved when the reactive compensation device is assembled manually in multiple processes.

[0026] 9. Because the bearing surface of the utility model also has an assembly width direction formed relative to the assembly length direction, the surface of the substrate forms a positioning stop by cutting a flange, and the positioning stop is used to form a stop for the first shell in the assembly length direction and / or the assembly width direction. Therefore, when the capacitor unit and the transducer unit are hoisted onto the substrate, the utility model can quickly position the capacitor unit and the transducer unit relative to the substrate based on the positioning stop, thereby greatly reducing the operational difficulty of the hoisting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A diagram showing the use of a reactive power compensation device according to an embodiment of the present utility model;

[0028] Figure 2 A schematic diagram of a substrate according to an embodiment of the present utility model;

[0029] Figure 3 A schematic diagram of a capacitor unit according to an embodiment of the present utility model;

[0030] Figure 4 It is a schematic diagram of the energy conversion unit (with the second housing side plate removed) of an embodiment of the utility model;

[0031] Figure 5 for Figure 4 Exploded diagram of

[0032] Figure 6 It is an assembly diagram of the second housing and the base plate of an embodiment of the utility model;

[0033] Figure 7 A schematic diagram of a transducer assembly according to an embodiment of the present utility model;

[0034] Figure 8 An exploded view of a laminated busbar assembly according to an embodiment of the present utility model;

[0035] Fig. 9 It is a schematic diagram of the cooperation between the substrate and the sliding assembly of an embodiment of the utility model.

[0036] In the figure: 100, reactive power compensation device, 10, substrate, 11, bearing surface, D1, assembly length direction, D2, assembly width direction, 12, drainage pipe, 13, reinforcing protrusion structure, 14, coupling folding edge, 141, coupling notch, 15, positioning stopper, 20, capacitor unit, 21, conducting column, 22, functional slot plate, 30, transducer unit, 31, second shell, 3111, shell frame, 3112, water passage, 312, basin-shaped sub-shell, 3121, functional folding edge, 32, transducer group Parts, 321, water cooling plate, 3211, water inlet, 322, IGBT, 33, laminated busbar assembly, 331, AC plate, 332, positive plate, 333, negative plate, 334, insulating barrier, 40, bypass switch unit, 41, monitoring port, 50, monitoring module, 60, transducer drive module, 70, bypass drive module, 80, reinforced sheet metal, 90, sliding assembly, 91, sliding recessed rail, 911, mounting side wall, 912, coupling side wall, 913, sliding wheel. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the utility model easy to understand, the following embodiments and drawings specifically illustrate the reactive power compensation device of the utility model. It should be noted that the description of these implementation methods is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0038] like Figure 1As shown in the figure, the reactive power compensation device 100 in this embodiment includes a substrate 10, a capacitor unit 20, a transducer unit 30, a bypass switch unit 40, a monitoring module 50, a transducer driving module 60, a bypass driving module 70, a reinforcing sheet metal part 80, and a sliding assembly 90.

[0039] As Figure 2 shown, the substrate 11 has a bearing surface 11, a drainage pipe 12, a reinforcing convex structure 13, a coupling flange 14, and a positioning stop 15.

[0040] The bearing surface 11 is a rectangular surface with an assembly length direction D1 and an assembly width direction D2. Specifically, the substrate 11 is a rectangular sheet metal, and the bearing surface 11 is the upper surface of the substrate 11. The remaining components of the reactive power compensation device 100 are installed on the bearing surface 11 or with the bearing surface 11 as the installation reference.

[0041] Specifically, the drainage pipe 12 and the reinforcing convex structure 13 are located at the bottom of the substrate 11. The coupling flange 14 is a flange of the substrate 11 in the assembly width direction D2, and the drainage pipe 12 is a metal pipe with both ends open, and one of its openings is open on the coupling flange 14.

[0042] As Fig. 9 shown, the reinforcing convex structure 13 is located at the bottom of the substrate 11 and protrudes downward, and the coupling flange 14 is located at the bottom of the substrate 11 and extends downward. The coupling flange 14 has a coupling notch 141.

[0043] The positioning stop 15 is formed by cutting and flanging, and is formed on the surface of the substrate 11 and stands upright upward.

[0044] The capacitor unit 20, the transducer unit 30, and the bypass switch unit 40 are arranged adjacent to each other in sequence along the assembly length direction D1 on the bearing surface 11.

[0045] As Figure 3 shown, the capacitor unit 20 includes a first housing (not shown in the drawings) and a compensation capacitor (not shown in the drawings) accommodated in the first housing.

[0046] At both ends of the first housing in the assembly length direction D1, there are two functional slot plates 22 at the top respectively. Specifically, the functional slot plates 22 are welded to the top surface of the first housing and are in the shape of a "匚" with the opening facing the surface of the first housing.

[0047] Specifically, the capacitor unit further includes a plurality of conduction columns 21. The conduction columns 21 are in conduction with the compensation capacitor and pass through the first housing. The conduction columns 21 are used to electrically connect the compensation capacitor to the transducer unit 30.

[0048] As Figures 4 to 6 shown, the transducer unit 30 includes a second housing (not shown in the drawings), a transducer assembly 32.

[0049] The first shell and the second shell are mechanically coupled along the assembly length direction. Specifically, the conducting column 21 of the capacitor unit 20 is not only electrically coupled with the transducer unit 30, but also plug-fitted with the second shell.

[0050] The second housing includes a functional sub-housing (not shown in the drawings) and a basin-shaped sub-housing 312 located directly above the functional sub-housing.

[0051] Specifically, the positioning stopper 15 is used to form a stopper for the first shell and / or the second shell in the assembly length direction D1 and / or the assembly width direction D2, so as to achieve rapid hoisting and positioning of the first shell and the second shell on the base plate 11.

[0052] Specifically, the functional sub-housing includes a housing frame 3111 and a water passage 3112 .

[0053] Specifically, the shell frame 3111 is a rectangular metal frame, the water passage 3112 is a hollow metal water pipe, the water passage 3112 extends vertically, the upper end is connected to the basin-shaped sub-shell 312, and the lower end is connected to the drainage pipe 12.

[0054] The top of the basin-shaped sub-shell 312 forms two functional folded edges 3121 at both ends of the assembly length D1, and a functional folded edge 3121 and a functional slot plate 22 that are far away form a lifting part, that is, the top of the first shell and the second shell each have a lifting part, which is used for lifting the capacitor unit 20 and the transducer unit 30 as a whole by an external lifting device through the lifting part. Specifically, when the two lifting parts are lifted, the capacitor unit 20 and the transducer unit 30 are the most concentrated stress points of the whole.

[0055] The transducer assembly 32 is accommodated inside the functional sub-housing, and includes a water-cooling plate 321 , an H-bridge power circuit (not shown in the drawings) disposed on the water-cooling plate, and a laminated busbar assembly 33 .

[0056] The water outlet portion of the water cooling plate 321 (not shown in the drawings) is located inside the basin-shaped sub-shell 312. Specifically, Figure 7 As shown, the water-cooling plate 321 is vertically arranged inside the functional sub-shell, and the water inlet and outlet pipe joints of the water-cooling plate 321 pass through the bottom of the basin-shaped sub-shell 312, so that the water outlet portion 3211 is located inside the basin-shaped sub-shell 312, and the water inlet and outlet pipe joints are sealed with the through-hole gap at the bottom of the basin-shaped sub-shell 312 by a sealing ring (not shown in the drawings), so that the connection between the water outlet portion 3211 of the water-cooling plate 321 and the corresponding water circulation components connected to the outside are all located in the basin-shaped sub-shell 312, even if an accidental leakage occurs, water will only flow into the basin-shaped sub-shell 312, and flow out of the reactive compensation device 100 through the water passage 3112 and the drainage pipe 12.

[0057] The H-bridge power circuit includes four IGBTs 322 , which are arranged on one side of the water cooling plate 321 along the assembly width direction D2 , and the four IGBTs 322 are arranged in a “field” shape, and the two IGBTs 322 of the same bridge arm extend along the assembly length direction D1 , and the negative side of the H-bridge power circuit is close to the capacitor unit 20 .

[0058] like Figure 8 As shown, the laminated busbar assembly 33 includes an AC plate 331 , a positive plate 332 , a negative plate 333 and an insulating separator 334 .

[0059] The negative electrode plates 333, the positive electrode plates 332 and the AC electrode plates 331 are arranged in sequence along the assembly width direction D2 toward the outside of the bearing surface 11, and are stacked in three layers. Specifically, there are two insulating partitions 334, which insulate and isolate the AC electrode plates 331 from the positive electrode plates 332, and insulate and isolate the positive electrode plates 332 from the negative electrode plates 333.

[0060] There are two AC plates 331, and the two AC plates 331 are arranged to cover the two bridge arms. The positive plate 332 is coupled with the positive electrode of the H-bridge power circuit, and the negative plate 333 is coupled with the negative electrode of the H-bridge power circuit. Specifically, each AC plate 331 spans the H-bridge power circuit in the assembly length D1, that is, the two AC plates 331 are parallel in the height direction, and each AC plate 331 covers two IGBTs 332, so that the overall thickness of the AC plates 331, the positive plate 332, and the negative plate 333 (about 12 mm), and the water cooling plate 321 cover the IGBTs 332 from opposite sides, so that when the IGBT 332 explodes accidentally, the scope of the explosion can be limited to a smaller area, and no damage is caused to other nearby components.

[0061] The bypass switch unit 40 includes a third housing (not shown in the drawings) and a bypass switch (not shown in the drawings) accommodated in the third housing.

[0062] The height of the third shell is smaller than the lower contour of the AC plate 331, and the bypass switch shell has a monitoring port 41 open to the outside. Specifically, through the monitoring port 41, the staff can monitor and operate the bypass switch status in the third shell, and when the two reactive compensation devices 100 are connected in forward or reverse electrical connection, the connection of the AC plate 331 will not affect the viewing angle of the monitoring port 41.

[0063] The monitoring module 50, the energy conversion drive module 60 and the bypass drive module 70 are all arranged on one side of the water-cooled plate 321 along the assembly width direction D2, and the side and the H-bridge power circuit are respectively located on both sides of the water-cooled plate 321. Therefore, due to the physical barrier of the water-cooled plate 321, in the second shell, the components through which strong current passes and the components through which weak current passes are respectively located in two relative spaces, and the mutual electromagnetic interference is greatly reduced.

[0064] A functional folded edge 3121 and a functional slot plate 22 close to each other are both threadedly connected to the reinforcing sheet metal part 80, thereby strengthening the structural integrity of the capacitor unit 20 and the transducer unit 30 and balancing the large stress generated during hoisting.

[0065] like Fig. 9 As shown, the sliding assembly 90 includes two sliding concave rails 91 extending along the assembly longitudinal direction D1, and the sliding concave rails 91 are in the form of a groove-shaped sheet metal with an opening facing upward.

[0066] The sliding recessed rail 91 has a mounting side wall 911 , a coupling side wall 912 , and a plurality of sliding wheels 913 , all of which extend upward.

[0067] The height of the mounting side wall 911 is smaller than the coupling side wall 912 , and the plurality of sliding wheels 913 are all located inside the sliding groove 91 . The plurality of sliding wheels 913 are all rotatably disposed on the mounting side wall 911 , and the plurality of sliding wheels 913 are evenly arranged along the extension direction of the sliding groove 91 .

[0068] The coupling side wall 912 is inserted and fitted into the coupling notch 141, and the wheel surface of the sliding wheel 913 abuts against the bottom surface of the reinforcing protruding structure 13. When the sliding component 90 is connected to the external mounting platform through a threaded connection, the substrate 10 is rollingly connected to the sliding component 90. Specifically, when the manual assembly operation is performed, the sliding component 90 is first assembled and fixed on the external mounting platform, and then the substrate 10 can be easily moved on the external mounting platform, even if the capacitor unit 20 and the transducer unit 30 are assembled on it.

[0069] The above-mentioned implementation modes are preferred cases of the present utility model and are not used to limit the protection scope of the present utility model. Various deformations or modifications that can be made by ordinary technicians in this field without creative work within the scope of the attached claims are still within the protection scope of this patent.

Claims

1. A reactive power compensation device, comprising a capacitor unit and a transducer unit, characterized in that: include: The base plate has a rectangular bearing surface, the bearing surface has a mounting length direction, The bypass switch unit comprises a third housing and a bypass switch accommodated in the third housing. The capacitor unit, the transducer unit and the bypass switch unit are arranged adjacent to each other in sequence along the assembly length direction on the bearing surface. The capacitor unit includes a first shell and a compensation capacitor accommodated in the first shell, and the transducer unit includes a second shell and a transducer component accommodated in the second shell. The first shell and the second shell are mechanically coupled along the assembly length, and the first shell and the second shell respectively have a lifting part, and an external lifting device lifts the capacitor unit and the transducer unit through the lifting part.

2. The reactive power compensation device according to claim 1, characterized in that: in, The bearing surface also has an assembly width direction formed relative to the assembly length direction, The energy conversion assembly includes a water-cooling plate, an H-bridge power circuit disposed on the water-cooling plate, and a laminated busbar assembly. The H-bridge power circuit is arranged on one side of the water cooling plate along the width direction of the assembly, and the H-bridge power circuit includes four IGBTs, which are arranged in a "field" shape and spaced apart, and two IGBTs in the same bridge arm extend along the length direction of the assembly. The laminated busbar includes two AC plate rows, and the two AC plate rows are arranged to cover and correspond to the two bridge arms.

3. The reactive power compensation device according to claim 2, characterized in that: in, The negative side of the H-bridge power circuit is close to the capacitor unit, The laminated busbar assembly further includes a negative electrode plate coupled to the negative electrode of the H-bridge power circuit and a positive electrode plate coupled to the positive electrode of the H-bridge power circuit. The negative electrode plate, the positive electrode plate and the two AC plate are arranged in sequence along the assembly width direction toward the outside of the bearing surface and are stacked in three layers.

4. The reactive power compensation device according to claim 2, characterized in that: Also includes: The monitoring module, the transducer drive module and the bypass drive module are all arranged on one side of the water cooling plate along the assembly width, and the side and the H-bridge power circuit are respectively located on both sides of the water cooling plate.

5. The reactive power compensation device according to claim 2, characterized in that: in, The height of the third shell is smaller than the lower contour of the AC panel, and the third shell has a monitoring port opened to the outside.

6. The reactive power compensation device according to claim 2, characterized in that: in, The second housing includes a functional sub-housing and a basin-shaped sub-housing, the transducer assembly is accommodated inside the functional sub-housing, and the basin-shaped sub-housing is located directly above the functional sub-housing. The water outlet of the water cooling plate is located inside the basin-shaped sub-shell. The functional sub-housing also has a water passage communicating with the basin-shaped sub-housing. The bottom of the base plate also has a drainage pipe communicated with the water passage.

7. The reactive power compensation device according to claim 6, characterized in that: Also includes: Reinforcement of sheet metal, The top of the basin-shaped sub-shell is formed with two functional folded edges at both ends of the assembly length direction. The top of the first shell has two functional slot plates at both ends of the assembly length direction. A functional fold and a functional slot plate that are far away from each other form the hanging part. A functional folded edge and a functional slot plate close to each other are both threadedly connected to the reinforcing sheet metal part.

8. The reactive power compensation device according to claim 1, characterized in that: Also includes: The sliding assembly comprises two sliding concave rails extending along the assembly length, wherein the sliding concave rails are groove-shaped sheet metal with the opening facing upwards. The sliding groove has a mounting side wall, a coupling side wall and a plurality of sliding wheels, all of which extend upward. The height of the mounting side wall is smaller than that of the coupling side wall, and the plurality of sliding wheels are all arranged on the mounting side wall and are evenly arranged along the extension direction of the sliding concave rail. The bottom of the base plate has a reinforcement protrusion structure protruding downward and a coupling fold extending downward, the coupling fold has a coupling notch, the coupling side wall is inserted into the coupling notch, the wheel surface of the sliding wheel abuts against the bottom surface of the reinforcement protrusion structure, When the sliding assembly is connected to the external mounting platform through threads, the base plate is rollingly connected to the sliding assembly.

9. The reactive power compensation device according to claim 1, characterized in that: in, The bearing surface also has an assembly width direction formed relative to the assembly length direction, The base plate is a sheet metal part, and a positioning stop is formed on the surface of the base plate by cutting and flanging. The positioning stop is used to form a stop for the first shell in the assembly length direction and / or the assembly width direction.

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