High voltage static var generator

Abstract

The application discloses a high-voltage static reactive generator and relates to the technical field of power transmission and transformation reactive power compensation. The high-voltage static reactive generator comprises a box body; the box body comprises a power unit area, and a plurality of valve groups are arranged in the power unit area; wherein each valve group comprises at least two layers of power units arranged in a vertical direction and a wire row assembly; each layer of power units comprises two rows of power modules arranged in parallel in a horizontal direction and corresponding to each other; the wire row assembly is arranged in a vertical direction and spirally surrounds the outer side of the valve group in a circumferential direction, and is electrically connected with each power module to connect a plurality of power modules in the at least two layers of power units in series. The power modules in the valve group are connected by adopting three-dimensional spiral wiring of the power modules on the same layer and the power modules of different layers. The wiring mode shortens the path between the corresponding potential points of the power modules on the back-to-back two sides, reduces the pressure difference, thereby reducing the electrical loss; meanwhile, the utilization rate of space is improved.

Description

Technical Field

[0001] This application relates to the field of reactive power compensation technology for power transmission and transformation, and more specifically, to a high-voltage static var generator. Background Technology

[0002] In existing technologies, a significant amount of reactive power is generated during the operation of inductive loads such as motors and transformers in AC power grids. This can lead to a decrease in the power factor of the grid, an increase in line losses, and may even cause voltage fluctuations, thus reducing power quality.

[0003] Static var generators (SVA) have become one of the mainstream technologies for reactive power compensation due to their advantages such as fast response speed, high compensation accuracy, and wide continuous adjustment range. Among them, box-type SVA generators have been widely used in outdoor power grids due to their advantages such as high integration, strong environmental adaptability, and convenient on-site installation.

[0004] However, the inventors discovered the following technical problems in the structural design of the existing high-voltage box-type static var generator.

[0005] 1) Low space utilization: Valve groups are mostly arranged in a decentralized manner or with flat wiring. The wiring occupies a lot of space, resulting in a large overall footprint of the static var generator, which is difficult to adapt to application scenarios with limited space.

[0006] 2) The voltage difference between corresponding points of the power modules is large, which leads to increased electrical losses.

[0007] The content in the background section is merely technology known to the public and does not necessarily represent existing technology in this field. Summary of the Invention

[0008] According to an embodiment of this application, a high-voltage static var generator (VGF) is provided. The VGF includes a housing; the housing includes a power unit area, in which multiple valve groups are disposed; each valve group includes at least two layers of power units and busbar assemblies stacked vertically; each power unit layer includes two rows of power modules arranged parallel to each other horizontally and corresponding one-to-one; the busbar assemblies are spirally arranged around the outer periphery of the valve group in the vertical direction and are electrically connected to each power module to connect multiple power modules in the at least two power unit layers in series.

[0009] The technical solution of this application involves arranging a cable assembly in a vertical direction, spirally surrounding the outer edge of the valve group and electrically connecting it to each power module, thereby connecting multiple power modules within at least two power units in series. This wiring method shortens the path between corresponding potential points of power modules on both sides; reduces the voltage difference between power modules on both sides, thus reducing electrical losses; and reduces the size of each valve group, thereby reducing the overall size of the high-voltage static var generator and the floor space required. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A top view of a high-voltage static var generator according to an embodiment of this application is shown; Figure 2 This is a three-dimensional structural schematic diagram of a valve assembly according to an embodiment of the present application; Figure 3 A schematic diagram of the structure of an air duct according to an embodiment of this application is shown; Figure 4 A schematic diagram of the structure of a mounting plate according to an embodiment of this application is shown; Figure 5 A first side view of a valve assembly according to an embodiment of this application is shown; Figure 6 A schematic diagram showing the dimensions of an air duct according to an embodiment of this application is provided. Figure 7 This diagram shows a structural schematic of the first sidewall according to an embodiment of the present application; Figure 8 A second side view of a plurality of valve assemblies according to an embodiment of the present application is shown.

[0012] Explanation of reference numerals in the attached figures: 1. Housing; 11. Power unit area; 12. Auxiliary equipment area; 13. First side wall; 131. Air duct; 1311. Air inlet; 1312. Air outlet; 1313. Air guide shroud; 1314. Mounting plate; 13141. Bending section; 1315. Mesh panel; 14. Second side wall; 141. Air conditioning equipment; 151. Fan; L. Spacing; 2. Valve assembly; 20. Power unit; 201. First side; 202. Second side; 21. Power module; 211. First gap; 22. Second gap; 23. Main inlet pipe; 24. Main outlet pipe; 25. Interlayer inlet pipe; 26. Interlayer outlet pipe; 27. Inter-module pipe; 28. Insulating support; 29. ​​Insulating plate; 3. Cable tray assembly; 31. Inter-layer transition cable tray; 32. Inter-layer transition cable tray; 33. Back-to-back transition cable tray; 34. Inter-module cable tray; 35. Inter-layer diagonal cable tray; 36. Inlet / outlet cable tray; 37. Neutral point terminal; 4. Liquid cooling mechanism; 41. Liquid cooling body; 42. Liquid inlet pipe; 43. Liquid outlet pipe; 5. Metal spacers; 6. Metal frame; 7. Valve control cabinet; 8. Distribution box; 9. Through-wall sleeve. Detailed Implementation

[0013] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0014] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0015] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0016] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order.

[0017] In this application embodiment, circulating current heating specifically refers to a common abnormal heating phenomenon in power equipment (especially transformers, motors, SVG power cabinets, etc.). The cause of circulating current heating is that, due to magnetic field induction or voltage difference, a circulating current is generated inside metal components (or between parallel conductors) that should not normally have current, causing the component to heat up abnormally.

[0018] This application provides a high-voltage static var generator. The power modules in the valve group utilize a three-dimensional spiral wiring configuration to connect power modules on both sides of the same layer, as well as power modules on different layers. This wiring method shortens the path between corresponding potential points of back-to-back power modules, reduces voltage differential, and thus reduces electrical losses; simultaneously, it improves space utilization.

[0019] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] Please refer to the above. Figure 1 and Figure 2 , Figure 1 A top view of a high-voltage static var generator according to an embodiment of this application is shown. Figure 2 A three-dimensional structural schematic diagram of a valve assembly according to an embodiment of this application is shown.

[0021] According to an example embodiment, this application provides a high-voltage static var generator. For example... Figure 1 As shown, the high-voltage static var generator includes a housing 1 and a valve group 2 installed inside the housing 1.

[0022] The housing 1 forms the outer shell of the high-voltage static var generator. Housing 1 is typically a hollow cuboid structure. The external shape of housing 1 can be designed as needed and is not limited here. Housing 1 contains a receiving cavity. This cavity provides installation space for components such as valve assembly 2.

[0023] Specifically, the housing 1 includes a power unit area 11. Multiple valve assemblies 2 are disposed within the power unit area 11. In this embodiment, the internal space of the housing 1 can be divided into multiple functional areas according to different functions. The power unit area 11 is one of these functional areas. Multiple functional areas in this embodiment specifically refer to two or more functional areas. In this embodiment, the internal space of the housing 1 is divided into two functional areas as an example for explanation.

[0024] In this embodiment, "multiple valve groups 2" specifically refers to two or more valve groups 2. This embodiment uses three valve groups 2 as an example for illustration. Specifically, the multiple valve groups 2 are spaced apart within the power unit area 11 of the housing 1.

[0025] like Figure 2 As shown, valve group 2 in this embodiment specifically refers to a core component in high-voltage power electronic equipment. Each valve group 2 includes at least two layers of power units 20 and busbar assemblies 3 stacked vertically. At least two layers of power units 20 specifically refers to two or more layers of power units 20 in this embodiment. This embodiment uses an example of each valve group 2 including four layers of power units 20 stacked vertically for illustration.

[0026] Specifically, each layer of power unit 20 includes two rows of power modules 21 arranged in parallel in the horizontal direction and corresponding one-to-one, so that the two rows of power modules 21 on each layer of power unit 20 are arranged back to back.

[0027] like Figure 2 As shown, the busbar assembly 3 is arranged in a vertical spiral around the outer circumference of the valve assembly 2. The busbar assembly 3 is electrically connected to each power module 21, thereby connecting multiple power modules 21 in series within at least two layers of power units 20.

[0028] In this embodiment, "multiple power modules 21" specifically refers to two or more power modules 21. This embodiment uses an example of forty power modules 21 within at least two layers of power units 20 for illustration.

[0029] In the prior art, the power modules of each layer on one side of the valve assembly are connected in series from one end via a curve or zigzag line, and then flipped over to the other side of the valve assembly to connect the power modules of each layer on the other side in the same way. The inventors of this application have discovered that this connection method results in a large voltage difference between two rows of power modules back-to-back on the same layer of the valve assembly, and consequently a large insulation distance between the two rows of power modules, which may lead to the following technical problems.

[0030] 1. Low power density and space utilization, and high material cost.

[0031] Larger insulation distances lead to an increase in the overall width or thickness of the valve assembly. Consequently, to insulate and secure the modules with the distance between them, longer insulation supports, more complex interlayer connection structures, and larger cabinets or towers are required. This setup reduces power density and increases material costs and installation space.

[0032] 2. Increased stray inductance leads to overvoltage and electromagnetic interference problems.

[0033] A larger insulation distance will correspondingly increase the length of the busbar connecting two back-to-back modules. A longer busbar loop will introduce greater stray inductance. When the switching devices in the power module are switched on and off at high frequencies, the interaction between the larger stray inductance and the rapidly changing current will generate a higher turn-off overvoltage, which may break down the device. At the same time, it will also aggravate electromagnetic interference, affecting the normal operation of the valve group's own control circuit and other nearby electronic equipment.

[0034] 3. Increased circuit resistance and losses exacerbate temperature rise.

[0035] Longer cable paths (whether curved or broken) and additional junctions or supports to increase insulation distances increase the total resistance of the current path, generating more heat. Increased space makes heat dissipation design inefficient, leading to localized temperature rises and reduced device reliability and lifespan.

[0036] 4. Increased distributed capacitance leads to leakage current and circulating current problems.

[0037] Increasing the distance between the metal planes of two back-to-back modules will cause structural changes, such as introducing longer parallel traces. Structural changes will result in complex capacitive coupling, which will lead to increased high-frequency leakage current and the formation of high-frequency circulating currents among multiple parallel power modules, increasing additional losses and even causing uneven current distribution.

[0038] 5. Risks related to insulation coordination and partial discharge.

[0039] Increasing the insulation distance exposes the medium (air) within that distance to distortion caused by non-uniform electric fields or sharp edges; however, the actual insulation withstand capability does not increase linearly with the insulation distance. Especially in harsh environments such as high altitudes and polluted conditions, larger gaps can lead to unstable streamer discharges, which in turn can cause partial discharges. Prolonged partial discharges can corrode the insulating material, resulting in insulation failure.

[0040] In the above embodiment, by setting the cable assembly 3 to spirally surround the outer side of the valve group 2 in the vertical direction and electrically connecting it to each power module 21, multiple power modules 21 within at least two layers of power units 20 are connected in series. This wiring method shortens the path between corresponding potential points of the power modules 21 on both sides back to back; reduces the voltage difference between the power modules 21 on both sides back to back, and reduces electrical losses; at the same time, it also reduces the size of each valve group, thereby reducing the overall size of the high-voltage static var generator and the floor space required.

[0041] This wiring method also reduces the insulation distance between the back-to-back rows of power modules, which in turn improves the problems of overvoltage and electromagnetic interference, increased loop resistance and loss, increased temperature rise, leakage current and circulating current, and partial discharge.

[0042] Furthermore, the arrangement of the cable assembly 3 in a vertical spiral around the outer circumference of the valve group 2 increases power density, enabling the device to be miniaturized. Simultaneously, this arrangement reduces the introduction of intermediate connection points, improving the device's reliability.

[0043] In the embodiments of this application, such as Figure 2 As shown, each layer of power unit 20 has a first side 201 and a second side 202 arranged opposite to each other. In this embodiment, the first side 201 and the second side 202 are the planes where the two ends of each layer of power unit 20 are located along the arrangement direction of the plurality of power modules 21.

[0044] like Figure 2 As shown, the cable assembly 3 includes a first inter-layer adapter cable 31, a second inter-layer adapter cable 32, a back-to-back adapter cable 33, an inter-module cable 34, and an inter-layer diagonal cable 35.

[0045] The back-to-back adapter panel 33 serves to connect circuits and distribute electrical energy. The back-to-back adapter panel 33 is located on the first side 201 and is electrically connected to two power modules 21 on the same layer near the first side 201. Specifically, in this embodiment, both ends of the back-to-back adapter panel 33 are directly connected to the two power modules 21 on the same layer near the first side 201, so that the two power modules 21 on the same layer near the first side 201 are connected in series.

[0046] The function of the inter-module busbar 34 is to connect circuits and distribute electrical energy. Specifically, the inter-module busbar 34 is used to connect two adjacent power modules 21 in each row. In this embodiment, there are multiple inter-module busbars 34 to connect multiple power modules 21 in each row in series. Specifically, "multiple inter-module busbars 34" in this embodiment refers to two or more inter-module busbars 34. The number of inter-module busbars 34 is not limited in this embodiment, as long as it can connect multiple power modules 21 in each row in series.

[0047] The function of the first-layer inter-transfer busbar 31 is to connect circuits and distribute electrical energy. Specifically, the first-layer inter-transfer busbar 31 is located on the second side 202 and is connected to the module busbar 34 on the same layer near the second side 202.

[0048] The function of the second-layer inter-connection busbar 32 is to connect circuits and distribute electrical energy. Specifically, the second-layer inter-connection busbar 32 is located on the second side 202. The second-layer inter-connection busbar 32 is connected to the module busbar 34 on the same layer near the second side 202. The second-layer inter-connection busbar 32 and the first-layer inter-connection busbar 31 are respectively connected to two power modules 21 on the same layer near the second side 202.

[0049] The function of the interlayer diagonal line 35 is to connect circuits and distribute electrical energy. One end of the interlayer diagonal line 35 is connected to the first interlayer transfer line 31, and the other end of the interlayer diagonal line 35 is connected to the second interlayer transfer line 32. Specifically, one end of the interlayer diagonal line 35 is connected to the first interlayer transfer line 31 of one of the two adjacent layers, and the other end of the interlayer diagonal line 35 is connected to the second interlayer transfer line 32 of the other of the two adjacent layers, so as to connect multiple power modules 21 of the two adjacent layers in series.

[0050] It should be understood that the back-to-back adapter bar 33 can also be set on the second side 202, and the first inter-layer adapter bar 31, the second inter-layer adapter bar 32 and the inter-layer diagonal bar 35 can also be set on the first side 201.

[0051] In the above embodiments, by setting back-to-back adapter busbars 33, first inter-layer adapter busbars 31, second inter-layer adapter busbars 32, and inter-layer diagonal busbars 35 on two opposite sides of the valve assembly 2, and connecting them to the inter-module busbars 34 at the end of each layer, the busbar assembly 3 can be arranged in a vertical spiral around the outer circumference of the valve assembly 2. This arrangement optimizes the wiring of the busbar assembly 3, realizing the series connection of multiple power modules 21 within a limited space, thereby enabling the device to be miniaturized.

[0052] In the embodiments of this application, such as Figure 2 As shown, the valve assembly 2 also includes a metal frame 6 and a metal pad 5. Multiple power modules 21 are fixed to the metal frame 6 in a back-to-back structure.

[0053] A metal pad 5 is placed at the fixed connection position between the back-to-back adapter strip 33 and the metal frame 6, so that the back-to-back adapter strip 33 and the metal frame 6 have a single point of contact. The thickness of the metal pad 5 can be set to 4mm-5mm.

[0054] In addition, the first interlayer junction box 31, the second interlayer junction box 32, the module junction box 34, and the interlayer diagonal junction box 35 are all fixedly installed on the metal frame 6, and can all be padded with metal pads 5 to improve the circulating heat generation.

[0055] The inventors of this application have discovered that the wiring method of multiple power modules in the prior art causes circulating current, resulting in heat generation.

[0056] In the above embodiments, by placing a metal pad 5 at the fixed connection position between the back-to-back adapter strip 33 and the metal frame 6, the back-to-back adapter strip 33 and the metal frame 6 are in single-point contact, which improves the circulating heating situation.

[0057] refer to Figure 3 , Figure 3 A schematic diagram of the structure of an air duct according to an embodiment of this application is shown.

[0058] In the embodiments of this application, such as Figure 1 and Figure 3 As shown, the housing 1 includes a first side wall 13, multiple air ducts 131, multiple fans 151, a second side wall 14, and multiple air conditioning devices 141.

[0059] In this embodiment, air duct 131 specifically refers to the internal flow path of gas within the first side wall 13 of the housing 1. Multiple air ducts 131 in this embodiment specifically refer to two or more air ducts 131. This embodiment uses three air ducts 131 as an example for illustration.

[0060] Specifically, such as Figure 1 and Figure 3 As shown, multiple air ducts 131 are spaced apart on the first side wall 13. Each air duct 131 includes an air inlet 1311 and an air outlet 1312.

[0061] In addition, in this embodiment, the air duct 131 is made of cold-rolled steel plate and is embedded in the first side wall 13 of the box 1, without occupying the internal space of the box 1.

[0062] The function of the fan 151 is to provide a power source for the flow of gas. Specifically, in this embodiment, "multiple fans 151" refers to two or more fans 151. It should be noted that the number of fans 151 is equal to the number of air ducts 131.

[0063] Specifically, multiple fans 151 are installed at the air outlets 1312 in a one-to-one correspondence.

[0064] refer to Figure 7 , Figure 7 A schematic diagram of the structure of the first sidewall according to an embodiment of this application is shown.

[0065] like Figure 7 As shown, a mesh plate 1315 is also provided on the air inlet 1311 of the air duct 131. The mesh plate 1315 can reduce the entry of dust and foreign objects into the interior of the air duct 131, which would affect the operation of the fan 151 and the flow of air.

[0066] like Figure 1As shown, the second sidewall 14 is arranged opposite to the first sidewall 13, forming a partial structure of the housing 1. The second sidewall 14, together with the other sidewalls, top wall, and bottom wall of the housing 1, forms the outer shell of the high-voltage static var generator.

[0067] The specific type of air conditioning equipment 141 is not limited in this embodiment, as long as it can control the environment in which the equipment operates. For example, the specific type of air conditioning equipment 141 can be an air conditioner, an air-cooled heat exchanger, etc. In this embodiment, an air conditioner is used as an example for illustration. In this embodiment, the air conditioner is preferably an industrial air conditioner.

[0068] In this embodiment of the application, "multiple air conditioning devices 141" specifically refers to two or more air conditioning devices 141. This embodiment uses three air conditioning devices 141 as an example for illustration.

[0069] Specifically, such as Figure 1 As shown, multiple air conditioning devices 141 are spaced apart on the second side wall 14 and are arranged one-to-one with the air inlet 1311.

[0070] In this process, the gas flows through the outer side of multiple valve groups 2 via the air conditioning device 141 and enters the air inlet 1311. The gas then flows from the air inlet 1311 through the interior of the air duct 131 to the air outlet 1312, and finally flows from the air outlet 1312 into the space between the two rows of power modules 21.

[0071] The inventors of this application discovered that existing box-type high-voltage static var generators suffer from uneven heat dissipation and condensation risks. Furthermore, the inventors found that this problem arises because the cooling systems are often single-sided industrial air conditioning systems that blow directly onto the system. Valve assemblies far from the air conditioning unit are prone to creating heat dissipation dead zones, leading to heat accumulation, while the direct airflow from the air conditioning unit can cause condensation.

[0072] In the above embodiment, multiple air conditioning devices 141 form directional airflow between the outer surfaces of multiple valve groups 2 (the channels between the multiple valve groups 2, and the channels between the two end valve groups 2 and the housing 1). The directional airflow complements the airflow drawn by multiple fans 151 on opposite sides, achieving uniform heat dissipation throughout the valve group 2.

[0073] refer to Figure 5 , Figure 5 A side view of a valve assembly according to an embodiment of this application is shown.

[0074] In the embodiments of this application, such as Figure 5 As shown, a first gap 211 is provided between the two rows of power modules 21. The air outlet 1312 is correspondingly positioned with respect to the first gap 211. Figure 5In the side view shown, the ends of the two rows of power modules 21 on the same layer can be regarded as either the first side 201 or the second side 202.

[0075] The inventors of this application have discovered that in the prior art, there is no gap between the two rows of power modules on the same layer of power unit, which prevents gas from flowing between the two rows of power modules, causing heat to accumulate between the two rows of power modules.

[0076] In the above embodiment, a first gap 211 is provided between the two rows of power modules 21, and the air outlet 1312 is correspondingly provided with the first gap 211. This allows the gas blown out from the air outlet 1312 to flow into the space between the two rows of power modules 21, thereby improving the heat dissipation capacity between the two rows of power modules 21.

[0077] In the embodiments of this application, such as Figure 1 and Figure 3 As shown, a second gap 22 is provided between multiple valve groups 2. The air inlet 1311 is provided corresponding to the outer end face of the valve group 2 at the middle end of the power unit area 11, or corresponding to the second gap 22.

[0078] The gas flows into the air inlet 1311 from the air conditioning device 141 through the outer end face of the valve group 2 at the end, or the gas flows into the air inlet 1311 from the air conditioning device 141 through the second gap 22.

[0079] The inventors of this application discovered that in the prior art, air conditioning equipment or fans are only installed on one side of the enclosure to dissipate heat from the valve assembly. This arrangement results in a single-direction airflow within the enclosure, limiting the space for heat dissipation.

[0080] Furthermore, in the existing technology, the air conditioning equipment is configured such that the air outlet of the air conditioning equipment is opposite to the valve group, causing the air conditioning equipment to blow directly onto the valve group, resulting in condensation on the surface of the power module of the valve group.

[0081] In the above embodiment, by respectively installing an air conditioning device 141 and an air duct 131 on the first sidewall 13 and the second sidewall 14 inside the housing 1, the airflow blown out by the air conditioning device 141 flows through the second gap 22 into the air inlet 1311 of the air duct 131, and then flows through the air outlet 1312 of the air duct 131 into the first gap 211 between the two rows of power modules 21. This achieves complementary airflow within the housing 1, thereby enabling uniform heat dissipation in all parts of the valve assembly 2 and improving the condensation problem on the surface of the power modules 21 of the valve assembly 2.

[0082] refer to Figure 6 , Figure 6 A schematic diagram of the dimensions of an air duct according to an embodiment of this application is shown.

[0083] In the embodiments of this application, such as Figure 6 As shown, a gap L is provided between the air inlet 1311 and the air outlet 1312. The value of the gap L ranges from 500mm to 600mm. For example, the value of the gap L can be 500mm, 510mm, 520mm, 530mm, 540mm, 550mm, 560mm, 570mm, 580mm, 590mm, 600mm, etc.

[0084] The inventors of this application have discovered that in the prior art, the distance between the air inlet and the air outlet of the air duct is too close, which can cause airflow to short-circuit, resulting in the airflow not passing through the area that needs to be cooled.

[0085] In the above embodiment, a gap L is provided between the air inlet 1311 and the air outlet 1312, which improves the situation where the air inlet 1311 and the air outlet 1312 are too close and airflow short-circuit occurs.

[0086] refer to Figure 4 , Figure 4 A schematic diagram of the structure of a mounting plate according to an embodiment of this application is shown.

[0087] In the embodiments of this application, such as Figure 3 As shown, each air duct 131 also includes a shroud 1313 and a mounting plate 1314.

[0088] The function of the flow deflector 1313 is to guide the fluid to flow along a designed path, thereby reducing energy loss and improving efficiency. In this embodiment, the fluid specifically refers to airflow. Specifically, the flow deflector 1313 is located at the air outlet 1312. The material type of the flow deflector 1313 is not limited in this embodiment, as long as it has insulating properties. For example, the material of the flow deflector 1313 can be epoxy resin.

[0089] Mounting plate 1314 is disposed at air outlet 1312 and is used to mount fan 151 and air guide shroud 1313. The material type of mounting plate 1314 is not limited in the embodiments of this application, as long as it has high strength and is not easily deformed. For example, the material type of mounting plate 1314 can be metal.

[0090] Specifically, such as Figure 4 As shown, a bent portion 13141 is provided along the edge of the mounting plate 1314. The bent portion 13141 has a bending angle of 74° relative to the mounting plate 1314.

[0091] If the angle between the bend 13141 and the mounting plate 1314 is too large, the air flowing out of the outlet 1312 will blow onto the power module 21 and then bounce back to the inlet 1311, resulting in energy loss and no heat dissipation effect. If the angle between the bend 13141 and the mounting plate 1314 is too small, the air blown out by the fan 151 will encounter too much resistance, leading to a reduction in heat dissipation effect.

[0092] In the above embodiment, the bending portion 13141 is bent at an angle of 74° relative to the mounting plate 1314, so that the width of the outlet of the air guide shroud 1313 installed on the bending portion 13141 is the same as the width of the first gap 211 set between the two rows of power modules 21. As a result, the gas flowing out of the air outlet 1312 will be blown into the first gap 211, achieving a good heat dissipation effect.

[0093] In the embodiments of this application, such as Figure 1 As shown, the housing 1 also includes an auxiliary equipment area 12 and a liquid cooling mechanism 4.

[0094] In this embodiment, the auxiliary equipment area 12 specifically refers to the supporting equipment area used for protection, control, monitoring, cooling, insulation, operation, and ensuring the reliable operation of the equipment within the power unit area 11. The auxiliary equipment area 12 is arranged adjacent to the power unit area 11.

[0095] The function of the liquid cooling mechanism 4 is to remove the heat generated by the equipment using coolant, thereby dissipating heat from the equipment. The liquid cooling mechanism 4 includes a liquid cooling body 41, an inlet pipe 42, and an outlet pipe 43. The coolant can be cooling water or other types of coolant.

[0096] The liquid cooling body 41 is located inside the auxiliary equipment area 12. The liquid inlet pipe 42 is located inside the power unit area 11. One end of the liquid inlet pipe 42 is connected to the liquid cooling body 41, and the other end is connected to the valve group 2, so as to deliver the coolant in the liquid cooling body 41 to the valve group 2 for heat dissipation.

[0097] The outlet pipe 43 is located inside the power unit area 11. One end of the outlet pipe 43 is connected to the liquid cooling body 41, and the other end is connected to the valve group 2, so that the coolant can absorb the heat of the valve group 2 and flow into the liquid cooling body 41 for heat exchange.

[0098] In this process, the coolant flows from the liquid cooling body 41 into the valve group 2 through the inlet pipe 42 to cool the valve group 2, and then flows back into the liquid cooling body 41 through the outlet pipe 43 to carry away the heat inside the valve group 2, thus forming a circulating cooling system.

[0099] In the embodiments of this application, such as Figure 1 As shown, each valve group 2 also includes a main inlet pipe 23 and a main outlet pipe 24.

[0100] Specifically, the main inlet pipe 23 is connected to the inlet pipe 42. The main outlet pipe 24 is connected to the main inlet pipe 23 and the outlet pipe 43.

[0101] The coolant flows from the liquid cooling body 41 through the inlet pipe 42, the main inlet pipe 23, the main outlet pipe 24, and the outlet pipe 43 in sequence, and then flows back to the liquid cooling body 41, carrying away the heat inside the valve group 2 to form a circulating cooling system.

[0102] In the embodiments of this application, such as Figure 2 As shown, each valve group 2 also includes an interlayer inlet pipe 25, an interlayer outlet pipe 26, and an intermodule pipe 27.

[0103] Interlayer liquid inlet pipe 25 is connected to main liquid inlet pipe 23. Interlayer liquid outlet pipe 26 is connected to main liquid outlet pipe 24. Module interlayer liquid pipe 27 is connected to interlayer liquid inlet pipe 25 and interlayer liquid outlet pipe 26.

[0104] Specifically, the interlayer inlet pipe 25 is located at the bottom of the valve assembly 2. The interlayer inlet pipe 25 is fixed by an insulating support 28. The interlayer inlet pipe 25 is used to supply coolant to each power module 21. The interlayer inlet pipe 25 of each valve assembly 2 is connected to the main inlet pipe 23.

[0105] Interlayer outlet pipe 26 is located at the top of valve assembly 2. Interlayer outlet pipe 26 is fixed by insulating plate 29. The interlayer outlet pipe 26 of each valve assembly 2 is connected to the main outlet pipe 24.

[0106] The inventors of this application have discovered that in the prior art, water pipe connections often use metal flanges or unions, resulting in a large number of joints and a risk of sealing leakage.

[0107] In the above embodiments, the main inlet pipe 23 and the main outlet pipe 24 are both integral homopolymer polypropylene insulated pipes without any metal flanges or unions in the middle, which greatly reduces the risk of water leakage. The main inlet pipe 23 and the main outlet pipe 24 are connected to the liquid cooling body 41 through the inlet pipe 42 and the outlet pipe 43 to form a closed loop for cyclic cooling.

[0108] refer to Figure 8 , Figure 8 A second side view of a plurality of valve assemblies according to an embodiment of this application is shown.

[0109] In the embodiments of this application, such as Figure 2 , Figure 7 and Figure 8 As shown, the high-voltage incoming line is introduced through the wall bushing 9 installed on the top of the housing 1 and connected to the inlet and outlet line 36 of the valve group 2.

[0110] The neutral point of valve group 2 is led out through the second interlayer junction box 32 at the bottom and connected to the pre-set neutral point terminal 37 below the wall bushing 9 by a high-voltage cable, which simplifies the structure of the high-voltage incoming line.

[0111] In the embodiments of this application, such as Figure 1 As shown, an air gap is provided between the side wall of the housing 1 and the valve assembly 2 for gas flow.

[0112] like Figure 1 As shown, the air gap between the second side wall 14 of the housing 1 and the valve group 2, the air gap between multiple valve groups 2, and the air gap between the two valve groups 2 at the ends and the two opposite side walls of the housing 1 can also serve as maintenance spaces, facilitating maintenance of the equipment inside the housing 1 by personnel. Specifically, the width of the air gap can be set to 350mm, and the width of the maintenance space can be set to 400mm.

[0113] The inventors of this application have discovered that in the prior art, the internal components of the enclosure are scattered and not integrated and optimized, which wastes space and makes maintenance inconvenient.

[0114] In the embodiments of this application, such as Figure 1 and Figure 7 As shown, the internal space of enclosure 1 is divided into a power unit area 11 and an auxiliary equipment area 12. Valve assembly 2 is located in the power unit area 11. Liquid cooling unit 41 and valve control cabinet 7 are located in the auxiliary equipment area 12 of enclosure 1. The distribution box 8 is wall-mounted and fixed to the side wall of enclosure 1, without occupying the space at the bottom of enclosure 1. This optimizes the space layout and facilitates maintenance.

[0115] Finally, it should be noted that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-voltage static var generator, characterized in that, include: The enclosure includes a power unit area, wherein multiple valve groups are provided in the power unit area; Each valve assembly includes: At least two layers of power units are stacked vertically, and each layer of power units includes two rows of power modules arranged in parallel and corresponding one-to-one in the horizontal direction. The cable assembly is arranged in a vertical direction, spirally surrounding the outer side of the valve group, and is electrically connected to each of the power modules to connect multiple power modules in the at least two layers of power units in series.

2. The high-voltage static var generator according to claim 1, characterized in that, Each power unit in the layer has a first side and a second side arranged opposite to each other; The busbar assembly includes: A back-to-back adapter bar is located on the first side and is electrically connected to two power modules on the same layer that are close to the first side. Inter-module busbars are used to connect two adjacent power modules in each row; The first layer inter-transfer busbar is located on the second side and is connected to the module inter-busbar on the same layer near the second side; The second inter-layer adapter busbar is disposed on the second side and connected to the module busbar on the same layer near the second side. The second inter-layer adapter busbar and the first inter-layer adapter busbar are respectively connected to two power modules on the same layer near the second side. The interlayer diagonal line is connected at one end to the first interlayer transition line and at the other end to the second interlayer transition line.

3. The high-voltage static var generator according to claim 1, characterized in that, The enclosure includes: First sidewall; Multiple air ducts are spaced apart on the first side wall, and each air duct includes an air inlet and an air outlet; Multiple fans are installed at the air outlet, one in one with each other; The second sidewall is disposed opposite to the first sidewall; Multiple air conditioning devices are spaced apart on the second side wall and are arranged one-to-one with the air inlets; In this process, the gas flows through the outer side of the multiple valve groups from the air conditioning device and enters the air inlet. The gas then flows from the air inlet through the inside of the air duct to the air outlet, and finally flows into the space between the two rows of power modules through the air outlet.

4. The high-voltage static var generator according to claim 3, characterized in that, A first gap is provided between the two rows of power modules; The air outlet is configured to correspond to the first gap.

5. The high-voltage static var generator according to claim 3, characterized in that, A second gap is provided between the plurality of valve assemblies; The air inlet is provided corresponding to the outer end face of the valve group at the middle end of the power unit area, or it is provided corresponding to the second gap; The gas flows into the air inlet from the air conditioning device through the outer end face of the valve group at the end, or the gas flows into the air inlet from the air conditioning device through the second gap.

6. The high-voltage static var generator according to claim 3, characterized in that, A gap is provided between the air inlet and the air outlet.

7. The high-voltage static var generator according to claim 3, characterized in that, Each of the aforementioned air ducts also includes: A deflector is provided at the air outlet; An mounting plate is provided at the air outlet for mounting the fan and the air guide.

8. The high-voltage static var generator according to any one of claims 1-7, characterized in that, The enclosure also includes: The auxiliary equipment area is located adjacent to the power unit area; Liquid cooling mechanism, the liquid cooling mechanism comprising: The liquid-cooled body is located inside the auxiliary equipment area; The liquid inlet pipe is located inside the power unit area, with one end connected to the liquid cooling body and the other end connected to the valve group; The liquid outlet pipe is located inside the power unit area, with one end connected to the liquid cooling body and the other end connected to the valve group; In this process, coolant flows from the liquid cooling body into the valve assembly through the inlet pipe to cool the valve assembly, and then flows back into the liquid cooling body through the outlet pipe to form a circulating cooling system.

9. The high-voltage static var generator according to claim 8, characterized in that, Each of the valve assemblies also includes: The main inlet pipe is connected to the inlet pipe; The main liquid outlet pipe is connected to the main liquid inlet pipe and the liquid outlet pipe; The coolant flows from the liquid cooling body through the inlet pipe, the main inlet pipe, the main outlet pipe, and the outlet pipe in sequence, and then flows back to the liquid cooling body to form a circulating cooling system.

10. The high-voltage static var generator according to claim 9, characterized in that, Each of the valve assemblies also includes: Interlayer inlet pipe, which is connected to the main inlet pipe; Interlayer liquid outlet pipe, which is connected to the main liquid outlet pipe; The inter-module liquid pipe is connected to the inter-layer liquid inlet pipe and the inter-layer liquid outlet pipe.

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