Capacitor pool assembly cooling system
By installing capacitor cells back-to-back and optimizing the heat dissipation duct structure, the problem of uneven capacitor temperature was solved, and the uniformity and reliability of capacitor temperature were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 天津瑞源电气有限公司
- Filing Date
- 2025-05-28
- Publication Date
- 2026-05-08
AI Technical Summary
Existing capacitor pool cooling methods result in uneven capacitor temperatures, which leads to significant heat accumulation, especially in high-power and ultra-high-power converters, affecting capacitor lifespan.
The capacitor pool structure is installed back to back, and a sealed air duct is formed by connecting plates. Airflow gaps are left between the parallel capacitors. Combined with centrifugal or axial fans for cooling, the heat dissipation air duct structure is optimized so that the cooling air flows evenly through each capacitor.
This achieves uniform capacitor temperature, reduces capacitor operating temperature, and improves product reliability.
Smart Images
Figure CN224217359U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of cooling and heat exchange technology, and in particular relates to a cooling system for a capacitor bank assembly. Background Technology
[0002] The DC bus capacitors in the power cabinet of a wind turbine converter are typically composed of several capacitors connected in parallel to form a capacitor pool. The power modules are connected to the capacitor pool via bus stacks. During operation, the capacitors generate heat and losses, requiring cooling. Current cooling methods involve stacking multiple capacitors flat, with air inlets and outlets at both ends of the capacitor pool. A water-cooled heat exchanger and a centrifugal fan are installed at the bottom. Cooling air is drawn in from one end, flows into the gaps between the capacitors, and exchanges heat with the capacitor casings. The hot air is then cooled by the heat exchanger and discharged, thus achieving cooling air circulation. However, this method results in the air temperature gradually increasing and accumulating as the cooling air passes through the stacked capacitors, leading to excessively high temperatures in the later-arriving capacitors. This is especially problematic in high-power and ultra-high-power converter applications, where the large number of capacitors exacerbates the heat accumulation effect, and the capacitor temperature directly impacts its lifespan.
[0003] Therefore, the heat dissipation design of capacitors in the capacitor pool is a key issue that engineers urgently need to solve. Utility Model Content
[0004] This utility model is achieved using the following technical solution:
[0005] A capacitor bank assembly cooling system includes two sets of capacitor banks mounted back-to-back, a heat exchanger, and a cooling fan. The two sets of capacitor banks are fixedly connected by a connecting plate, forming a sealed air duct of a certain thickness between the two sets of capacitor banks at the top of the connecting ring. The heat exchanger and the cooling fan are installed at the bottom of the capacitor banks and connected to the sealed air duct. The cooling fan delivers the airflow after heat exchange in the heat exchanger to the internal environment of the power cabinet, or the cooling fan delivers the airflow in the internal environment of the power cabinet to the heat exchanger for heat exchange.
[0006] Several power modules are installed on the outer surfaces of the two sets of capacitor banks. Several first openings are provided on the outer walls of the capacitor banks between the power modules, and several second openings are provided on the opposite side surfaces of the two sets of capacitor banks.
[0007] Furthermore, several rows of capacitors are installed inside the capacitor pool, and the rows of capacitors are connected in parallel by stacking. At least one side of the capacitor pool is an open structure, and airflow gaps are formed between the open-structure capacitors.
[0008] Furthermore, several rows of capacitors are installed inside the capacitor pool, and the rows of capacitors are connected in parallel by stacking. The sides of the capacitor pool are all open structures, and airflow gaps are formed between the open-structure capacitors.
[0009] Furthermore, the first and second openings can be regular or irregular shapes.
[0010] The cooling fan is a centrifugal fan or an axial fan.
[0011] The beneficial technical effects of this utility model are as follows:
[0012] This invention optimizes the heat dissipation duct structure of the capacitor pool to achieve parallel and uniform airflow to each parallel capacitor, making the air temperature around each capacitor the same, eliminating the heat accumulation effect, and making the temperature of each capacitor more uniform, thereby reducing the operating temperature of the capacitor and improving the reliability of the product. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of a capacitor bank assembly cooling system provided in an embodiment of this utility model;
[0014] Figure 2 This is a longitudinal cross-sectional view of a capacitor bank assembly cooling system provided in an embodiment of this utility model;
[0015] Figure 3 This is a side view of a capacitor bank assembly cooling system provided in an embodiment of this utility model;
[0016] Figure 4 This is a schematic diagram of the capacitor cell structure of a capacitor cell assembly cooling system provided in an embodiment of this utility model;
[0017] Figure 5 This is a schematic diagram of another orientation of the capacitor pool in a capacitor pool assembly cooling system provided by an embodiment of the present invention. Detailed Implementation
[0018] like Figure 1-5 As shown, this embodiment discloses a capacitor bank assembly cooling system, including two sets of capacitor banks 1 installed back to back, a heat exchanger 2, and a cooling fan 3; the two sets of capacitor banks are fixedly connected by a connecting plate 4, so that a sealed air duct 5 of a certain thickness is formed between the two sets of capacitor banks in the upward direction of the connecting ring; the heat exchanger and the cooling fan are installed at the bottom of the capacitor banks; the heat exchanger is connected to the sealed air duct; the cooling fan sends the airflow after heat exchange in the heat exchanger to the internal environment of the power cabinet, or the cooling fan sends the airflow in the internal environment of the power cabinet to the heat exchanger for heat exchange;
[0019] Several power modules 6 are installed on the outer surfaces of the two sets of capacitor banks. Several first openings 7 are provided on the outer walls of the capacitor banks between the power modules. Several second openings 8 are provided on the opposite side surfaces of the two sets of capacitor banks.
[0020] The capacitor bank contains several rows of capacitors 9, which are connected in parallel by stacking. In this embodiment, for example... Figure 3 , 4 The capacitor pool includes several capacitor pool stacks A connected in sequence. Three rows of capacitors are installed in the capacitor pool stack. It should be noted that at least one side of the capacitor pool is an open structure, and airflow gaps 10 are formed between the open structure capacitors.
[0021] To facilitate better airflow and achieve more uniform heat dissipation around the capacitors, it is advisable to consider an open structure on the sides of the capacitor pool, with airflow gaps formed between the open capacitors.
[0022] As an example, in this embodiment, when the capacitor bank assembly is cooled, the cooling air enters the capacitor bank through the first opening and the airflow gap. After flowing through the capacitors, the hot airflow from the two sets of capacitor banks converges in the middle sealed air duct, and then enters the heat exchanger at the bottom. After cooling, it is sent out to the internal environment of the power cabinet by the cooling fan. Of course, the airflow direction can also be reversed. The cooling fan can be a centrifugal fan or an axial fan. The air intake method can be exhaust or blowing, which has the same effect in this embodiment.
[0023] Of course, the first opening and the second opening can be regular or irregular shapes. In this embodiment, for ease of processing, the first opening and the second opening are circular holes.
[0024] The special design of the inlet and outlet openings of the capacitor cell in this embodiment guides the cooling air to flow evenly and parallel through the capacitor cell. The air temperature entering each capacitor housing gap is consistent, and the air flows out at the nearest outlet, eliminating the path of heat accumulation, thereby improving the uniformity of capacitor temperature and reducing the temperature of the capacitor core.
[0025] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.
Claims
1. A capacitor bank assembly cooling system, characterized in that, It includes two sets of capacitor banks, heat exchangers, and cooling fans installed back to back; the two sets of capacitor banks are fixedly connected by a connecting plate, so that a sealed air duct of a certain thickness is formed between the two sets of capacitor banks in the upward direction of the connecting ring; the heat exchanger and the cooling fan are installed at the bottom of the capacitor banks; the heat exchanger is connected to the sealed air duct; the cooling fan delivers the airflow after heat exchange in the heat exchanger to the internal environment of the power cabinet, or the cooling fan delivers the airflow in the internal environment of the power cabinet to the heat exchanger for heat exchange; Several power modules are installed on the outer surfaces of the two sets of capacitor banks. Several first openings are provided on the outer walls of the capacitor banks between the power modules, and several second openings are provided on the opposite side surfaces of the two sets of capacitor banks.
2. The capacitor bank assembly cooling system according to claim 1, characterized in that: The capacitor pool is equipped with several rows of capacitors, which are connected in parallel by stacking. At least one side of the capacitor pool is an open structure, and airflow gaps are formed between the open capacitors.
3. The capacitor bank assembly cooling system according to claim 1, characterized in that: The capacitor pool is equipped with several rows of capacitors, which are connected in parallel by stacking. The sides of the capacitor pool are all open structures, and airflow gaps are formed between the open capacitors.
4. The capacitor bank assembly cooling system according to claim 1, characterized in that: The first opening and the second opening are either regular or irregular shapes.
5. A capacitor bank module cooling system according to claim 1, characterized in that: The cooling fan is a centrifugal fan or an axial fan.