Single-pole and double-pole universal SVG (static var generator) power unit structure

Abstract

The utility model relates to a unipolar and bipolar universal SVG (static var generator) power unit structure, which comprises a capacitor unit shell, a power unit shell and a cover plate, the cover plate is fixedly connected with the top of the capacitor unit shell, and the capacitor unit shell is connected to the top of the power unit shell; the single-stage power unit or the double-stage power unit is arranged in the power unit shell with the same specification and size, and a water cooling plate connected with the single-stage power unit or the double-stage power unit is arranged in the power unit shell. The universal power unit has the advantages that the integral structure is compact, the power unit shell is of a universal structure, single-stage and double-stage power units can be arranged in the power unit shell with the same size, and the universal structure design can flexibly meet different functional requirements. Single-stage and double-stage power unit structures can be unified in specification, a modular structure is formed, the functions of a system or a product are easily adjusted and optimized, and the diversified requirements of the market are met.

Description

Technical Field

[0001] This utility model belongs to the field of static var generators (SVG), and particularly relates to a single- and bipolar universal SVG power unit structure. Background Technology

[0002] Static Dynamic Var Compensator (SVG) plays a crucial role in power systems, particularly in power quality. With the rapid growth of new energy sources, the demands for power quality are increasing. SVG systems are widely used in large-scale wind farms and photovoltaic power plants. An SVG utilizes high-power IGBTs (Inductively Coupled Power Transmission Devices) to form a self-commutated bridge circuit, which is connected in parallel to the power grid via a reactor. By appropriately adjusting the amplitude and phase of the AC output voltage of the bridge circuit, or by directly controlling its AC current, the circuit can absorb or generate reactive current to meet requirements, achieving dynamic reactive power compensation. The power unit is the core component and plays a key role.

[0003] The market's increasing demand for compact and miniaturized SVGs has driven the research and development of compact SVGs. This requires a compact power unit structure to improve power density and space utilization. This is mainly achieved by optimizing the internal structure to reduce volume, save space, and minimize footprint. Compact SVGs are typically designed according to project requirements, resulting in a long design cycle. Therefore, modular design is adopted to shorten the design cycle while facilitating assembly and maintenance, improving equipment reliability and maintainability. In existing technologies, single-stage and dual-stage units differ in size and specifications, lacking universality and thus failing to meet the requirements of modular design. Utility Model Content

[0004] The purpose of this invention is to provide a single- and double-pole universal SVG power unit structure. The single- and double-pole power unit structures have unified specifications, can use universal housings and water-cooling plates, reduce design difficulty and cost, shorten the design cycle, and facilitate assembly and maintenance.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A single- and double-polar universal SVG power unit structure includes a capacitor unit housing, a power unit housing, and a cover plate. The cover plate is fixedly connected to the top of the capacitor unit housing, and the capacitor unit housing is connected to the top of the power unit housing. A single-stage power unit or a double-stage power unit is set inside a power unit housing with the same specifications and dimensions. A water-cooling plate connected to the single-stage power unit or the double-stage power unit is provided inside the power unit housing.

[0007] The water-cooled plate connected to the single-stage power unit and the water-cooled plate connected to the dual-stage power unit have the same structure.

[0008] The capacitor unit housing contains several capacitors.

[0009] The capacitors and power devices are connected via a composite busbar.

[0010] The single-stage power unit includes a single control board and power devices. The power devices are connected to the single control board, which is positioned above the power devices. The power devices are connected to capacitors via a single composite busbar and to a water-cooling plate. The power devices consist of multiple IGBTs.

[0011] The dual-stage power unit includes a control board and two power devices. Each power device includes multiple IGBTs. The IGBTs are fixedly connected to a water-cooled plate. The control board is positioned above the IGBTs and connected to the power unit housing.

[0012] The two power devices are arranged side by side inside the power unit housing.

[0013] The two power devices are respectively connected to two columns of capacitors via a composite busbar.

[0014] The capacitor unit housing and the power unit housing are both ABS mold housings.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model features a compact overall structure and a universal power unit housing, allowing single and dual-stage power units to be housed within the same sized housing. This universal design flexibly addresses diverse functional requirements. It also standardizes single and dual-stage power unit structures, creating a modular structure that facilitates easy adjustment and optimization of system or product functionality, thus meeting diverse market demands.

[0017] 2. The capacitor unit housing and power unit housing of this utility model adopt a universal structure, achieving standardization and large-scale production, thereby reducing production costs. At the same time, due to the modular structure, maintenance and component replacement become simpler and more convenient, further reducing maintenance costs.

[0018] 3. The water-cooled plate of this utility model is of a uniform specification, which can dissipate heat for power devices in both single-stage and dual-stage power units, reducing the design and assembly difficulty of the SVG overall cabinet, further enhancing the versatility of this utility model, making each part of the system or product relatively independent, which is conducive to rapid location and repair in case of failure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of this utility model.

[0020] Figure 2 This is a schematic diagram showing the connection between the capacitor unit housing and the capacitor.

[0021] Figure 3 This is a schematic diagram of the internal structure of this utility model. Figure 1 .

[0022] Figure 4 This is a schematic diagram of the internal structure of this utility model. Figure 2 .

[0023] Figure 5 This is a schematic diagram of the internal structure of this utility model. Figure 3 .

[0024] Figure 6 This is a schematic diagram of the connection structure between the two-stage power unit and the capacitor. Figure 1 .

[0025] Figure 7 This is a schematic diagram of the connection structure between the two-stage power unit and the capacitor. Figure 2 .

[0026] Figure 8 This is a schematic diagram of the connection structure between the two-stage power unit and the capacitor. Figure 3 .

[0027] Figure 9 This is a schematic diagram of the connection structure between a single-stage power unit and a capacitor. Figure 1 .

[0028] Figure 10 This is a schematic diagram of the connection structure between a single-stage power unit and a capacitor. Figure 2 .

[0029] Figure 11 This is a schematic diagram of the connection structure between a single-stage power unit and a capacitor. Figure 3 .

[0030] In the diagram: 1-Cover plate 2-Capacitor unit housing 3-Power unit housing 4-Capacitor 5-Handle 6-Surge capacitor 7-IGBT 8-Water cooling plate 9-Thick film resistor 10-Temperature switch 11-Composite busbar 12-Control board 13-Single control board 14-Single composite busbar. Detailed Implementation

[0031] 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.

[0032] See Figures 1-5A single- and dual-stage universal SVG power unit structure includes a capacitor unit housing 2, a power unit housing 3, and a cover plate 1. The cover plate 1 is fixedly connected to the top of the capacitor unit housing 2, and the capacitor unit housing 2 is connected to the top of the power unit housing 3. The cover plate 1 effectively prevents upper components or water droplets from falling into the unit. The capacitor unit housing 2 is responsible for installing the capacitor 4 assembly. The components inside the housing can be assembled separately in the housing first, and then assembled together after the components are assembled. Single-stage or dual-stage power units are set in the power unit housing 3 with the same specifications and dimensions. The power unit housing 3 is a universal structure that meets the installation requirements of both single-stage and dual-stage power units. The power unit housing 3 is equipped with a water-cooled plate 8 that is connected to the single-stage or dual-stage power unit. The water-cooled plate 8 connected to the single-stage power unit and the water-cooled plate 8 connected to the dual-stage power unit have the same structure and specifications. The front of the water-cooled plate 8 is connected to the IGBT 7, and the back can be connected to other devices that require heat dissipation, such as thick film resistors 9 and temperature switches 10. The water-cooled plate 8 adopts a multi-IGBT7 compatible design, allowing it to be paired with different IGBT7 combinations. While ensuring the uniformity of the water-cooled plate 8's dimensions, it guarantees stable operation of the equipment in high-temperature environments. The capacitor 4 is connected to the power devices via a composite busbar 11. Handles 5 are fixed to both the capacitor unit housing and the power unit housing for easy movement.

[0033] See Figure 2 The capacitor unit housing 2 contains several capacitors 4, which can be fixedly connected inside the capacitor unit housing 2 after assembly. Different numbers of capacitors 4 can be configured according to the power range, while the capacitor unit housing 2 remains unchanged, achieving compatibility.

[0034] In the single- and bipolar universal SVG power unit structure, see Figures 9-11 The single-stage power unit is arranged as a single unit, including a single control board 13 and power devices. The power devices are connected to the single control board 13, which is positioned above the power devices. The power devices are connected to capacitors 4 via a single composite busbar 14 and to a water-cooling plate 8. The power devices consist of multiple IGBTs 7. The IGBTs 7 are also connected to surge capacitors 6. The single control board 13 is fixed to the power unit housing 3. The single control board 13, power devices, and capacitors 4 can be arranged from top to bottom, ensuring sufficient spacing.

[0035] See Figures 6-8 The dual-stage power unit in the single- and bipolar universal SVG power unit structure includes a control board 12 and two power devices arranged left and right. Each power device includes two IGBTs 7, which are fixedly connected to the front of the water-cooled plate 8. The control board 12 is positioned above the IGBTs 7 and connected to the power unit housing 3. The IGBTs 7 are also connected to the surge capacitor 6.

[0036] Two power devices are arranged side-by-side inside the power unit housing 3. Capacitors 4 can be arranged in two rows inside the capacitor unit housing 2. The two power devices are respectively connected to the two rows of capacitors 4 via composite busbars 11.

[0037] Both capacitor unit housing 2 and power unit housing 3 are ABS mold housings.

[0038] The compact SVG is a device designed for specific application needs. Utilizing capacitor unit housings 2, power unit housings 3, and water-cooling plates 8 of identical dimensions, the SVG power unit structure forms a compact, modular design with standardized specifications and strong versatility. This shortens the design cycle, reduces assembly difficulty and production costs. Furthermore, the modular design facilitates assembly and maintenance, while improving equipment reliability and maintainability. The identical capacitor unit housings 2 allow for the installation of single-stage or dual-stage power units, achieving compatibility between single and dual-stage power units and covering various power ranges. This results in high efficiency and a compact design, providing higher power density and better performance. By integrating two H-bridge circuits, higher power output and superior performance are achieved.

[0039] Through the above specific embodiments, those skilled in the art can easily implement this utility model. However, it should be understood that this utility model is not limited to the specific embodiments described above. Based on the disclosed embodiments, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions. Due to space limitations and for the sake of brevity, not all of these combined solutions have been described. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A single / double pole universal SVG power cell structure, characterized in that, The capacitor unit shell, the power unit shell, and the cover plate are fixedly connected with the top of the capacitor unit shell, and the capacitor unit shell is connected to the top of the power unit shell; the single-stage power unit or the double-stage power unit is arranged in the power unit shell with the same size, and the water cooling plate connected with the single-stage power unit or the double-stage power unit is arranged in the power unit shell.

2. The single / double pole universal SVG power cell structure of claim 1, wherein, The water cooling plate connected with the single-stage power unit and the water cooling plate connected with the double-stage power unit have the same structure.

3. The single / double pole universal SVG power cell structure of claim 1, wherein, The capacitor unit shell is provided with a plurality of capacitors.

4. The single / double pole universal SVG power cell structure of claim 1, wherein, The capacitors and the power devices are connected through the composite busbar.

5. The single / double pole universal SVG power cell structure of claim 1, wherein, The single-stage power unit comprises a single control board and power devices, the power devices are connected with the single control board, the single control board is arranged above the power devices, the power devices are connected with the capacitors through the single composite busbar, the power devices are connected with the water cooling plate, and the power devices are a plurality of IGBT.

6. The single / double pole universal SVG power cell structure of claim 1, wherein, The double-stage power unit comprises a control board and two power devices, each power device comprises a plurality of IGBT, the IGBT is fixedly connected with the water cooling plate, the control board is arranged above the IGBT and connected with the power unit shell.

7. The single / double pole universal SVG power cell structure of claim 6, wherein, The two power devices are arranged side by side in the power unit shell.

8. The single / double pole universal SVG power cell structure of claim 6, wherein, The two power devices are respectively connected with the two rows of capacitors through the composite busbar.

9. The single / double pole universal SVG power cell structure of claim 1, wherein, The capacitor unit shell and the power unit shell are ABS mold shells.

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