A variable current boosting device and energy storage power station

Abstract

The utility model provides a kind of current conversion boost equipment and energy storage power station, belong to current conversion boost equipment technical field, including oil-immersed transformer, energy storage inverter unit and fan assembly. Energy storage inverter unit is arranged along first direction with oil-immersed transformer interval;Energy storage inverter unit has wiring cavity, and wiring cavity is used to arrange transmission line;Air inlet and air outlet are equipped on the cavity wall of wiring cavity, and air outlet is towards oil-immersed transformer;Fan assembly is located in wiring cavity;Fan assembly is used to blow the airflow flowing through wiring cavity to oil-immersed transformer.The utility model provides a kind of current conversion boost equipment, utilize wiring cavity as airflow passage, air outlet is directly towards transformer, fan assembly forcibly blows the airflow flowing through wiring cavity to oil-immersed transformer, forms active heat dissipation mechanism, compared with natural convection, enhances the heat exchange efficiency of oil-immersed transformer surface, improves heat dissipation effect, effectively reduces operating temperature.

Description

Technical Field

[0001] This utility model belongs to the technical field of converter voltage boosting equipment, and more specifically, it relates to a converter voltage boosting equipment and an energy storage power station. Background Technology

[0002] An energy storage power station is a system capable of storing electrical energy on a large scale. The main equipment in a large-scale energy storage power station includes energy storage battery units and converter / step-up units. Converter / step-up units generally consist of an energy storage inverter and a step-up transformer. The energy storage inverter's function is to convert the current form and control the system, while the step-up transformer's function is to increase the voltage level.

[0003] Energy storage power stations typically have power ratings in the tens or even hundreds of megawatts. Oil-immersed transformers have a natural advantage in handling large capacities and high voltages, and are also inexpensive to manufacture, making them widely used in converter step-up units. However, in current technology, oil-immersed transformers rely primarily on the natural circulation of transformer oil and natural air convection for heat dissipation, resulting in relatively poor heat dissipation. Utility Model Content

[0004] The purpose of this utility model is to provide a converter step-up device and an energy storage power station, which aims to solve the technical problem of poor heat dissipation of oil-immersed transformers in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a converter booster device, comprising: Oil-immersed transformer; An energy storage inverter unit is arranged at a distance from the oil-immersed transformer along a first direction; the energy storage inverter unit has a wiring cavity for arranging power transmission lines; the cavity wall of the wiring cavity is provided with an air inlet and an air outlet, the air outlet facing the oil-immersed transformer; and A fan assembly is located in the wiring cavity; the fan assembly is used to blow airflow flowing through the wiring cavity toward the oil-immersed transformer.

[0006] In one possible implementation, the wiring cavity is located at the bottom of the energy storage inverter unit, and the air outlet faces the bottom of the oil-immersed transformer; the fan assembly is located at the air outlet.

[0007] In some embodiments, the oil-immersed transformer includes: Transformer body; and A heat dissipation fin assembly is arranged around the transformer body; the heat dissipation fin assembly includes multiple vertically arranged heat dissipation fins, and a heat dissipation air duct is formed between each two adjacent heat dissipation fins. The fan assembly discharges air along the first direction and is oriented toward the plurality of cooling air ducts.

[0008] In some embodiments, the distance between the air outlet side of the fan assembly and the heat dissipation fin assembly is less than or equal to the distance between the energy storage inverter unit and the heat dissipation fin assembly.

[0009] In one possible implementation, the energy storage inverter unit is provided in two sets, with the two sets of energy storage inverter units located on both sides of the oil-immersed transformer in the first direction.

[0010] In one possible implementation, the wiring cavity includes a DC cavity and an AC cavity that are isolated from each other; the power transmission line includes cables arranged in the DC cavity and busbars arranged in the AC cavity. Both the DC cavity and the AC cavity extend along the first direction; the fan assembly includes a first fan disposed in the DC cavity and a second fan disposed in the AC cavity.

[0011] In some embodiments, the air inlet includes a first air inlet communicating with the DC cavity and a second air inlet communicating with the AC cavity; the air outlet includes a first air outlet communicating with the DC cavity and a second air outlet communicating with the AC cavity; The air intake direction of the first air inlet is opposite to that of the second air inlet, and both air intake directions are perpendicular to the first direction; the air outlet direction of the first air outlet is the same as that of the second air outlet, and both air outlet directions are parallel to the first direction. The first fan is located at the first air outlet, and the second fan is located at the second air outlet; The DC cavity is also provided with a first air guide plate; the AC cavity is also provided with a second air guide plate.

[0012] In some embodiments, the air intake direction is defined as a second direction, in which the first air guide plate is located outside the cable, and in the first direction, the first air guide plate is inclined outward from front to back; In the second direction, the second air guide plate is located outside the busbar, and in the first direction, the second air guide plate is inclined outward from front to back.

[0013] In some embodiments, the energy storage inverter unit includes: A base, the inner cavity of which is the wiring cavity; the base is provided with a partition, the partition dividing the wiring cavity into the DC cavity and the AC cavity; and Multiple energy storage inverters are arranged in parallel on the base; In the horizontal direction, at least one side of the base protrudes outward relative to the plurality of energy storage inverters.

[0014] The beneficial effects of the converter and booster device provided by this utility model are as follows: Compared with the prior art, the converter and booster device of this utility model arranges the oil-immersed transformer and the energy storage inverter at intervals along the first direction, uses the wiring cavity as an airflow channel, and directs the air outlet towards the transformer. The fan assembly forces the airflow flowing through the wiring cavity to blow towards the oil-immersed transformer, forming an active heat dissipation mechanism. Compared with natural convection, this enhances the heat exchange efficiency of the surface of the oil-immersed transformer, improves the heat dissipation effect, and effectively reduces the operating temperature. The wiring cavity serves as an airflow channel, integrating the heat dissipation function of the power transmission line layout with that of the oil-immersed transformer. This eliminates the need for additional complex heat dissipation pipes or equipment, saving space, reducing the overall complexity and manufacturing cost of the equipment, and maintaining its compactness.

[0015] This utility model also provides an energy storage power station, including multiple converter and booster devices as described above; the multiple converter and booster devices are distributed in a rectangular array.

[0016] The energy storage power station provided by this utility model, by adopting the above-mentioned converter and step-up equipment, can improve the heat dissipation efficiency of the oil-immersed transformer, while reducing costs and shrinking the layout space. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of the converter booster device provided in this embodiment of the utility model; Figure 2 for Figure 1 A structural schematic diagram of the converter booster device from another angle; Figure 3 for Figure 1 A schematic diagram of the structure of one of the energy storage inverter units after removing two side plates from its base; Figure 4 for Figure 2 A schematic diagram of the structure of one of the energy storage inverter units after removing two side plates from its base; Figure 5 A schematic diagram of the structure of the base of the energy storage inverter unit provided in this embodiment of the utility model after removing three side plates.

[0019] In the picture: 1. Oil-immersed transformer; 11. Transformer body; 12. Heat dissipation fin assembly; 2. Energy storage inverter unit; 20. Wiring cavity; 201. DC cavity; 202. AC cavity; 203. First air inlet; 204. Second air inlet; 205. First air outlet; 206. Second air outlet; 207. First air guide plate; 208. Second air guide plate; 209. Partition plate; 21. Base; 22. Energy storage inverter; 31. First fan; 32. Second fan; 41. Cables; 42. Busbars. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] Please refer to the following: Figure 1 and Figure 2 The present invention provides a converter and booster device. The converter and booster device includes an oil-immersed transformer 1, an energy storage inverter unit 2, and a fan assembly. The energy storage inverter unit 2 and the oil-immersed transformer 1 are arranged at intervals along a first direction. The energy storage inverter unit 2 has a wiring cavity 20 for arranging power transmission lines. The cavity wall of the wiring cavity 20 is provided with an air inlet and an air outlet, with the air outlet facing the oil-immersed transformer 1. The fan assembly is located in the wiring cavity 20 and is used to blow the airflow passing through the wiring cavity 20 toward the oil-immersed transformer 1.

[0022] The core function of the energy storage inverter unit 2 is to perform current conversion and system control. During discharge (power supply to the grid), its main function is inversion, converting the low-voltage DC power from the energy storage battery unit into low-voltage AC power that meets grid requirements. During charging (power drawn from the grid), its function is rectification, converting the AC power from the grid into suitable DC power to charge the energy storage battery unit.

[0023] The energy storage inverter unit 2 adopts a natural air cooling heat dissipation method. The energy storage inverter unit 2 has a lower air intake side and an upper air outlet side. The outside cold air enters its interior from the lower air intake side, and the cold air passes through the internal electrical components, carrying away the heat of the electrical components. The hot air exits from the upper air outlet side, forming a heat dissipation path from bottom to top.

[0024] The core function of the oil-immersed transformer 1 is to boost the voltage level. It raises the low-voltage AC output from the energy storage inverter unit 2 to medium or high voltage to achieve the voltage level required for long-distance power transmission. The oil-immersed transformer 1 and the energy storage inverter unit 2 are electrically connected via the aforementioned transmission lines.

[0025] The cooling principle of the oil-immersed transformer 1 utilizes the convection of transformer oil to transfer internal heat to the external environment. During operation, the heat generated by the core and windings first heats the transformer oil in contact with it. The heated oil becomes less dense and rises, flowing through the tank walls and heat sink fins. During this process, heat is transferred to the cooler tank walls via conduction, and then the tank walls and heat sink fins dissipate the heat into the air through radiation. The cooled oil becomes denser, naturally descends, and flows back to the bottom of the transformer, restarting the circulation. This continuously removes internal heat, maintaining the stable operation of the transformer. In addition, the oil-immersed transformer 1 also uses a fan assembly for forced airflow cooling.

[0026] The transmission line includes busbars 42 and cables 41. After the energy storage inverter 2 inverts DC power into low-voltage AC power, it is first led out through its internal AC output terminals. If the energy storage inverter 2 consists of multiple power modules connected in parallel, their AC outputs will first be connected to the same set of busbars 42 to combine multiple currents into a single total current. The busbars 42 are then connected to the low-voltage input terminal of the oil-immersed transformer 1. The busbars 42 themselves carry high voltage, and any dust accumulation or condensation may cause short circuits or flashovers, so their IP protection level requirements are high. Furthermore, the busbars 42 are in a relatively sealed environment, resulting in poor heat dissipation.

[0027] The fundamental function of cable 41 is to transmit a large amount of DC power between the energy storage battery pack and the energy storage inverter 2. During discharge, cable 41 is the first mile of energy transmission, delivering the DC power stored in the energy storage battery pack to the energy storage inverter 2 without reservation. During charging, cable 41 is the last mile of energy transmission, safely and efficiently injecting the rectified DC power from the energy storage inverter 2 into the energy storage battery pack. Like the busbar 42, cable 41 will generate heat whenever current flows through its conductor resistance. The larger the current, the more severe the heat generation. Especially when multiple cables are tightly bundled together, they will heat each other, leading to heat accumulation.

[0028] In this embodiment, the busbar 42 and cable 41 of the power transmission line are arranged inside the wiring cavity 20. The wiring cavity 20 serves as an airflow channel, allowing outside cold air to flow through it and carry away the heat from the busbar 42 and cable 41, thus dissipating heat from the power transmission line. Furthermore, the fan assembly forces the airflow through the wiring cavity 20 towards the oil-immersed transformer 1, transforming the original naturally cooled oil-immersed transformer 1 into a system of localized forced convection heat transfer.

[0029] Compared with the prior art, the converter and booster device provided by this utility model has an oil-immersed transformer 1 and an energy storage inverter 22 arranged at intervals along a first direction. The wiring cavity 20 serves as an airflow channel, with the air outlet directly facing the transformer. The fan assembly forces the airflow passing through the wiring cavity 20 towards the oil-immersed transformer 1, forming an active heat dissipation mechanism. Compared with natural convection, this enhances the heat exchange efficiency of the surface of the oil-immersed transformer 1, improves the heat dissipation effect, and effectively reduces the operating temperature. The wiring cavity 20 serves as an airflow channel, integrating the heat dissipation function of the power transmission line layout and the heat dissipation function of the oil-immersed transformer 1 into one unit. This eliminates the need for additional complex heat dissipation pipes or equipment, saving space, reducing the overall complexity and manufacturing cost of the equipment, and maintaining its compactness.

[0030] In some embodiments, the wiring cavity 20 may be as follows: Figure 3 and Figure 4 The structure shown is described in the following document. Figure 3 and Figure 4 The wiring cavity 20 is located at the bottom of the energy storage inverter unit 2, and the air outlet faces the bottom of the oil-immersed transformer 1; the fan assembly is located at the air outlet.

[0031] Placing the wiring cavity 20 at the bottom allows the upper and middle spaces of the energy storage inverter 22 unit to be used for arranging more core electrical components that require height, such as power modules and reactors. This achieves compact and rational utilization of the internal space of the equipment, and facilitates the connection of the busbar 42 to the oil-immersed transformer 1, as well as the connection of the cable 41 to the energy storage battery unit.

[0032] It should be noted that the wiring cavity 20 is connected to the inner cavity of the energy storage inverter unit 2. This ensures that the busbar 42 and cable 41 are electrically connected to the energy storage inverter unit 2. Since the energy storage inverter unit 2 adopts a bottom-inlet and top-outlet heat dissipation path, placing the wiring cavity 20 at the bottom is also to cooperate with the heat dissipation method of the energy storage inverter unit 2, ensuring that cold air can flow fully over all heat-generating components and promptly remove the heat from the hottest spots.

[0033] The air outlet of the wiring cavity 20 faces the bottom of the oil-immersed transformer 1, and the fan assembly is located at the air outlet. The air outlet is not a passive ventilation opening; it works in conjunction with the fan assembly to form an active air pump. The fan assembly forces the air flowing through the wiring cavity 20 towards the bottom of the transformer. The forced airflow can blow away the hot air from the surfaces of the cables 41 and the busbars 42, improving heat dissipation efficiency and preventing heat from accumulating inside the wiring cavity 20.

[0034] Furthermore, the busbar 42 and cable 41 generate relatively little heat, resulting in limited temperature rise of the air after passing through them. Compared to the oil-immersed transformer 1, the air remains cool. Blowing the slightly warmed cool air exhausted from the wiring cavity 20 towards the bottom of the oil-immersed transformer 1 accelerates the surrounding airflow. The cool air also carries away heat from the oil-immersed transformer 1; forced convection is far more efficient than natural convection in heat dissipation. This effectively provides the transformer with an additional, low-power cooling fan, helping to reduce the operating temperature of the oil-immersed transformer 1.

[0035] In some embodiments, the oil-immersed transformer 1 described above can be as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The oil-immersed transformer 1 includes a transformer body 11 and a heat dissipation fin assembly 12. The heat dissipation fin assembly 12 is arranged around the transformer body 11; the heat dissipation fin assembly 12 includes a plurality of vertically arranged heat dissipation fins, and a heat dissipation air duct is formed between each pair of adjacent heat dissipation fins; wherein, the fan assembly discharges air along a first direction, and the fan assembly is oriented towards the plurality of heat dissipation air ducts.

[0036] The fan assembly faces multiple heat dissipation ducts, which can actively blow slightly warmed cold air into the vertical heat dissipation ducts along the first direction. The forced airflow can quickly blow away the layer of stagnant hot air attached to the surface of the heat dissipation fins, so that the cold air can come into direct contact with the hot heat dissipation fins to improve heat exchange efficiency.

[0037] Furthermore, the vertically arranged heat dissipation fin groups 12 form numerous narrow, towering heat dissipation channels between adjacent fins. When the oil-immersed transformer 1 is running, heat is transferred to the heat dissipation fins through the transformer oil, causing the fin temperature to be much higher than the ambient temperature. These high-temperature fins continuously heat the air within the surrounding heat dissipation channels. The heated air becomes less dense, generating strong buoyancy. Constrained by the vertical heat dissipation channels, this hot air automatically and continuously flows upwards, eventually being discharged into the air from the top, creating a chimney effect.

[0038] While the chimney effect itself can cause air to rise, its suction at the bottom is weak, and the airflow direction is easily affected by external crosswinds. The fan assembly directs airflow along the first direction into these cooling ducts, injecting cooling air at high pressure into the bottom of the ducts, replacing the stagnant air that was originally to be heated. This forced airflow into the cooling ducts not only enhances heat transfer, but its momentum and air pressure also greatly strengthen and stabilize the upward path and speed of the hot air, ensuring that the hot air rises at high speed along the pre-designed cooling ducts, rather than overflowing from the sides.

[0039] Therefore, the main release path of all heated air is locked upward, avoiding accumulation near the ground, thus significantly reducing its heating effect on the local environment, mitigating the heat island effect, and improving the environmental friendliness and operational safety of the entire energy storage power station.

[0040] In some embodiments, the distance between the air outlet side of the aforementioned fan assembly and the heat dissipation fin assembly 12 is less than or equal to the distance between the energy storage inverter unit 2 and the heat dissipation fin assembly 12. That is, part of the fan assembly is located at the air outlet, and part is located outside the air outlet.

[0041] The air pressure and volume generated by the fan assembly decrease rapidly with increasing propagation distance after leaving the outlet, accompanied by airflow diffusion. By forcibly defining a shorter, or even the shortest, path, the airflow with the highest dynamic pressure at the fan assembly outlet can be directly injected into the cooling duct with minimal loss and maximum efficiency. The airflow has no chance to diffuse or leak along the way, thus ensuring that the cooling duct receives sufficient cool air.

[0042] In some embodiments, the energy storage inverter unit 2 and the oil-immersed transformer 1 can be connected by, for example, Figure 1 and Figure 2 The structure shown is described in the following document. Figure 1 and Figure 2 The energy storage inverter unit 2 is provided in two sets. In the first direction, the two sets of energy storage inverter units 2 are located on both sides of the oil-immersed transformer 1.

[0043] The fan assemblies at the bottom of the two sets of energy storage inverter units 2 work simultaneously, supplying air to the heat dissipation fin assembly 12 from both sides. This is equivalent to installing two fans on the oil-immersed transformer 1, blowing air from both sides, avoiding the problem of insufficient airflow and uneven heat dissipation on the other side that may be caused by air supply from one side. Moreover, the symmetrical air supply method ensures a more uniform temperature field distribution between the transformer body and the heat dissipation fins.

[0044] The AC output side of the energy storage inverter unit 2 needs to be connected to the oil-immersed transformer 1 via a busbar 42. The symmetrical layout on both sides minimizes the connection path on the AC side. Shortening the distance directly reduces the resistance of the busbar 42, reduces energy transmission loss, improves system efficiency, and reduces material and installation costs.

[0045] In some embodiments, the wiring cavity 20 may be as follows: Figure 3 , Figure 4 and Figure 5 The structure shown is described in the following document. Figure 3 , Figure 4 and Figure 5The wiring cavity 20 includes a DC cavity 201 and an AC cavity 202 that are isolated from each other; the power transmission line includes a cable 41 arranged in the DC cavity 201 and a busbar 42 arranged in the AC cavity 202. Both the DC cavity 201 and the AC cavity 202 extend along a first direction; the fan assembly includes a first fan 31 arranged in the DC cavity 201 and a second fan 32 arranged in the AC cavity 202.

[0046] The DC side of an energy storage power station system has high voltage and large current, and the DC arc has no zero-crossing point, making it extremely difficult to extinguish. Once a fault occurs, the arc energy is enormous and continuous, posing a great danger. The AC side also has high voltage and large current, but its fault characteristics differ from those of the DC side. Physically isolating the DC and AC sides is equivalent to establishing an electrical firewall. If a severe arc or short-circuit fault occurs in one cavity, the robust physical partition 209 can effectively confine the fault within that cavity, preventing it from spreading to another cavity and avoiding a single fault evolving into a catastrophic accident for the entire system.

[0047] In addition, during maintenance, operators can clearly distinguish areas of different voltage levels and types. For example, when performing maintenance on the DC side, they are completely free from the threat of adjacent AC high-voltage live conductors, as the locked partition 209 provides a clear safety boundary.

[0048] Both the DC cavity 201 and the AC cavity 202 extend along the first direction. The air discharged from the two cavities can merge into and strengthen the main airflow towards the heat dissipation duct without obstruction, avoiding airflow vortices, energy loss, and reduced heat dissipation efficiency caused by inconsistent directions. Moreover, the layout of extending in the same direction is also conducive to the arrangement of the busbar 42, so that the connection path on the AC side is optimized.

[0049] Since the DC cavity 201 and the AC cavity 202 are isolated, using only one fan would require a complex air duct design to simultaneously cool both or only cool one side, and the air pressure distribution would be difficult to balance. By using separate fans for the DC cavity 201 and the AC cavity 202, each cavity receives independent, sufficient, and stable air pressure and airflow without interference. The first fan 31 establishes a stable microenvironment for the DC cavity 201, while the second fan 32 provides powerful cooling for the AC cavity 202, each efficiently completing its task.

[0050] Preferably, please refer to Figures 1 to 4Based on the above embodiments, the air inlet includes a first air inlet 203 connected to the DC cavity 201 and a second air inlet 204 connected to the AC cavity 202; the air outlet includes a first air outlet 205 connected to the DC cavity 201 and a second air outlet 206 connected to the AC cavity 202; the air inlet direction of the first air inlet 203 is opposite to the air inlet direction of the second air inlet 204, and both air inlet directions are perpendicular to the first direction; the air outlet direction of the first air outlet 205 is the same as the air outlet direction of the second air outlet 206, and both air outlet directions are parallel to the first direction; a first fan 31 is disposed at the first air outlet 205, and a second fan 32 is disposed at the second air outlet 206; a first air guide plate 207 is also disposed inside the DC cavity 201; a second air guide plate 208 is also disposed inside the AC cavity 202.

[0051] The first air inlet 203 and the second air inlet 204 are designed in opposite directions, which can achieve uniform distribution and efficient intake of cold air, avoid air competition between the DC cavity 201 and the AC cavity 202, and ensure that their respective air sources are independent and sufficient. Moreover, the air intake direction is perpendicular to the first direction, so that the cold air has a sufficiently long path to exchange heat with the internal cables 41 / busbars 42 when entering the DC cavity 201 / AC cavity 202.

[0052] The first air outlet 205 and the second air outlet 206 are in the same direction and parallel to the first direction, which means that the two slightly heated cold air streams after passing through the DC cavity 201 and the AC cavity 202 can immediately merge into a more concentrated airflow and blow together toward the heat dissipation fin assembly 12.

[0053] In addition, a first air guide plate 207 is installed inside the DC cavity 201. Given the complex layout of the DC side cables 41, the first air guide plate 207 can direct airflow to areas prone to overheating, such as the middle of the cable bundles or connection points, ensuring no cooling dead zones. A second air guide plate 208 is installed inside the AC cavity 202. Since the busbars 42 typically have a regular structure, the second air guide plate 208 ensures that airflow evenly sweeps across the surface of each busbar, rather than slipping away through open areas with low resistance, thereby maximizing the heat dissipation efficiency of the busbars 42.

[0054] Preferably, please refer to Figure 3 and Figure 4 Based on the above implementation method, the air intake direction is defined as the second direction. In the second direction, the first air guide plate 207 is located outside the cable 41, and in the first direction, the first air guide plate 207 is inclined outward from front to back. In the second direction, the second air guide plate 208 is located outside the busbar 42, and in the first direction, the second air guide plate 208 is inclined outward from front to back.

[0055] It should be noted that the above "inner" and "outer" definitions are based on the second direction, where the direction towards the outer side plate of the wiring cavity 20 is considered outward, and the direction towards the center line of the wiring cavity 20 (i.e., partition 209) is considered inward. The above "front" and "rear" definitions are based on the first direction, where the direction closer to the air inlet is considered forward, and the direction closer to the air outlet is considered rearward.

[0056] In the second direction, the first air guide plate 207 is located outside the cable 41, that is, in the second direction, the cable 41 is located between the partition 209 and the first air guide plate 207. Similarly, the busbar 42 is located between the partition 209 and the second air guide plate 208.

[0057] In the second direction, the first air guide plate 207 is positioned outside the cable 41, effectively creating a guiding wall between the airflow and the heating element. The cold air flowing in from the first air inlet 203 would naturally seek the path of least resistance. The presence of the first air guide plate 207 blocks the shortcut of airflow directly bypassing the heating element, forcing the cold air to enter the narrow flow channel formed by the partition 209 and the first air guide plate 207. This ensures that the cold air is used to directly cool the cable 41, which experiences the most severe heat generation, instead of escaping to the side, thus avoiding the problem of central overheating caused by the tight internal structure of the cable 41 bundle, making it difficult for airflow to penetrate.

[0058] The first air guide plate 207 is inclined outward from front to back, forming a gradually expanding flow channel. The general trend of the airflow is from the first air inlet 203 to the first air outlet 205. The first air guide plate 207 is inclined outward from front to back, and its inclination direction perfectly matches the main movement direction of the airflow, providing a smooth guiding ramp for the airflow and greatly reducing flow resistance.

[0059] At the beginning of the flow channel (near the first air inlet 203), the channel is relatively narrow, the airflow velocity is high, and the static pressure is low. This helps to capture and guide the airflow from the first air inlet 203, allowing it to quickly enter the working area. As the airflow moves backward, the channel gradually widens, the airflow velocity slows down, and the static pressure recovers. This design allows the airflow to maintain a relatively balanced air pressure and coverage area throughout its length of the heating element, preventing premature diffusion and attenuation of the airflow at the end.

[0060] Moreover, the end of the first air guide plate 207 is also prepared to connect with the first air outlet 205. When the airflow after passing through the cable 41 reaches the first air outlet 205, it has been naturally pushed by the first air guide plate 207 to the optimal position aligned with the second air outlet 206, so that it can be smoothly blown to the heat dissipation fin assembly 12, realizing a seamless transition from partial heat dissipation inside the DC cavity 201 to heat dissipation of the oil-immersed transformer 1.

[0061] It should be noted that since the second air guide plate 208 and the first air guide plate 207 are symmetrically arranged with the partition plate 209 as the reference, the second air guide plate 208 has the same effect as the first air guide plate 207, which will not be elaborated here.

[0062] In some embodiments, the energy storage inverter unit 2 described above can adopt the following... Figure 1 , Figure 2 and Figure 5 The structure shown is described in the following document. Figure 1 , Figure 2 and Figure 5 The energy storage inverter unit 2 includes a base 21 and multiple energy storage inverters 22; the inner cavity of the base 21 is a wiring cavity 20; a partition 209 is also provided inside the base 21, which divides the wiring cavity 20 into a DC cavity 201 and an AC cavity 202; the multiple energy storage inverters 22 are arranged in parallel on the base 21; wherein, in the horizontal direction, at least one side of the base 21 protrudes outward relative to the multiple energy storage inverters 22.

[0063] The base 21 is used to support multiple energy storage inverters 22, serving as the mounting base for the multiple energy storage inverters 22. In addition, the base 21 is also used to lay busbars 42 and cables 41.

[0064] The base 21 is clearly divided into an AC cavity 202 and a DC cavity 201 by a built-in vertical partition 209. The partition 209 completely physically isolates the busbar 42 from the DC cable 41, avoiding electromagnetic interference that may be generated by high-voltage, high-current AC power on DC signals. More importantly, it prevents short circuits between the DC side and the high-voltage AC side due to line faults or insulation damage, greatly improving the safety of the equipment.

[0065] Each energy storage inverter 22 is a complete energy conversion unit. Multiple energy storage inverters 22 are arranged in parallel cabinets to achieve power superposition and redundancy. The failure of a single inverter will not cause the entire system to shut down, thus improving the availability and reliability of the system.

[0066] In addition, each energy storage inverter 22 has an independent and complete heat dissipation duct. The air enters the interior of the energy storage inverter 22 from the lower air intake side, carrying away the heat from the heat-generating electrical components, and is discharged from the upper air outlet side. Most of the heat generated by the energy storage inverter 22 itself is directly discharged to the external environment through its vertical air duct, without discharging hot air into the DC cavity 201 and AC cavity 202, ensuring that the heat generated by the energy storage inverter 22 does not accumulate on the busbar 42 and cable 41.

[0067] Based on the same inventive concept, embodiments of this application also provide an energy storage power station, including multiple of the above-mentioned converter-boost devices; the multiple converter-boost devices are distributed in a rectangular array. In addition, the energy storage power station also includes multiple energy storage battery devices, with each energy storage battery device corresponding one-to-one with the multiple converter-boost devices; or, one converter-boost device corresponds to two or four energy storage battery devices.

[0068] The energy storage power station provided by this utility model, by adopting the above-mentioned converter and step-up equipment, can improve the heat dissipation efficiency of the oil-immersed transformer, while reducing costs and shrinking the layout space.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A converter-boosting device, characterized in that, include: Oil-immersed transformer (1); An energy storage inverter unit (2) is arranged at intervals from the oil-immersed transformer (1) along a first direction; the energy storage inverter unit (2) has a wiring cavity (20) for arranging power transmission lines; the wall of the wiring cavity (20) is provided with an air inlet and an air outlet, the air outlet facing the oil-immersed transformer (1); and A fan assembly is located in the wiring cavity (20); the fan assembly is used to blow the airflow flowing through the wiring cavity (20) toward the oil-immersed transformer (1).

2. The converter-boost device as described in claim 1, characterized in that, The wiring cavity (20) is located at the bottom of the energy storage inverter unit (2), and the air outlet faces the bottom of the oil-immersed transformer (1); the fan assembly is located at the air outlet.

3. The converter and boost converter as described in claim 2, characterized in that, The oil-immersed transformer (1) includes: Transformer body (11); and Heat dissipation fin assembly (12) is arranged around the transformer body (11); the heat dissipation fin assembly (12) includes a plurality of vertically arranged heat dissipation fins, and a heat dissipation air duct is formed between each two adjacent heat dissipation fins; The fan assembly discharges air along the first direction and is oriented toward the plurality of cooling air ducts.

4. The converter and boost converter as described in claim 3, characterized in that, The distance between the air outlet side of the fan assembly and the heat dissipation fin group (12) is less than or equal to the distance between the energy storage inverter unit (2) and the heat dissipation fin group (12).

5. The converter-boost device according to any one of claims 1-4, characterized in that, The energy storage inverter unit (2) is provided in two sets. In the first direction, the two sets of energy storage inverter units (2) are located on both sides of the oil-immersed transformer (1).

6. The converter-boost device as described in claim 1, characterized in that, The wiring cavity (20) includes a DC cavity (201) and an AC cavity (202) that are isolated from each other; the power transmission line includes a cable (41) arranged in the DC cavity (201) and a busbar (42) arranged in the AC cavity (202); The DC cavity (201) and the AC cavity (202) both extend along the first direction; the fan assembly includes a first fan (31) disposed in the DC cavity (201) and a second fan (32) disposed in the AC cavity (202).

7. The converter and boost converter as described in claim 6, characterized in that, The air inlet includes a first air inlet (203) communicating with the DC cavity (201) and a second air inlet (204) communicating with the AC cavity (202); the air outlet includes a first air outlet (205) communicating with the DC cavity (201) and a second air outlet (206) communicating with the AC cavity (202); The air intake direction of the first air inlet (203) is opposite to that of the second air inlet (204), and both air intake directions are perpendicular to the first direction; the air outlet direction of the first air outlet (205) is the same as that of the second air outlet (206), and both air outlet directions are parallel to the first direction. The first fan (31) is located at the first air outlet (205), and the second fan (32) is located at the second air outlet (206); The DC cavity (201) is also provided with a first air guide plate (207); the AC cavity (202) is also provided with a second air guide plate (208).

8. The converter and boost converter as described in claim 7, characterized in that, The air intake direction is defined as the second direction. In the second direction, the first air guide plate (207) is located outside the cable (41), and in the first direction, the first air guide plate (207) is inclined outward from front to back. In the second direction, the second air guide plate (208) is located outside the busbar (42), and in the first direction, the second air guide plate (208) is inclined outward from front to back.

9. The converter and boost converter as described in claim 6, characterized in that, The energy storage inverter unit (2) includes: A base (21) has an inner cavity that is the wiring cavity (20); a partition (209) is provided inside the base (21), the partition (209) dividing the wiring cavity (20) into the DC cavity (201) and the AC cavity (202); and Multiple energy storage inverters (22) are arranged in parallel on the base (21); In the horizontal direction, at least one side of the base (21) protrudes outward relative to the plurality of energy storage inverters (22).

10. An energy storage power station, characterized in that, It includes multiple converter boost devices as described in any one of claims 1-9; the multiple converter boost devices are distributed in a rectangular array.

Images