Energy storage inversion type high-voltage power supply peak absorption device based on double grading rings

Abstract

The invention relates to the technical field of high-voltage electrical equipment, and discloses an energy storage inversion type high-voltage power supply peak absorption device based on double grading rings, which comprises an oil tank assembly, first grading rings, second grading rings, first support columns and second support columns, the first grading rings are arranged at the top of the oil tank assembly through a plurality of first support columns, and the second grading rings are arranged at the bottom of the oil tank assembly through a plurality of second support columns. The second grading ring and the second supporting columns are arranged at the bottom of the oil tank assembly, and the first grading ring, the second grading ring and the center of the oil tank assembly are coaxial. Symmetrical electric fields are formed through the upper grading ring and the lower grading ring, electric field distribution is cooperatively improved, potential gradient abrupt change of the suspension oil tank is effectively restrained, the partial discharge risk is reduced, voltage distribution is uniform, and the situation of damage caused by local breakdown is avoided.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical equipment technology, and in particular to a high-voltage power supply peak absorption device based on a dual equalizing ring energy storage inverter. Background Technology

[0002] Composite insulators have a distinctive structural feature: only the top and bottom ends contain metal. This unique structure results in a significant non-uniformity in the potential distribution between the metal surface and the outer insulation material during operation. When the electric field strength exceeds the breakdown field strength of air, corona discharge occurs. Corona discharge is not an isolated event; it severely interferes with the surrounding electromagnetic environment. This interference can affect the normal operation of nearby communication equipment and even disrupt the monitoring and control signals of the power system itself. Simultaneously, the high-energy particles generated by corona discharge continuously bombard the outer insulation material, accelerating its aging over time and gradually degrading its mechanical and electrical properties. This seriously threatens the safe and stable operation of the power system, potentially leading to serious accidents such as line tripping and equipment damage.

[0003] In the operation of energy storage inverter-type high-voltage power supplies, high-frequency switching is a common occurrence, and this operation inevitably generates transient voltage spikes. If these voltage spikes are not effectively controlled, they can cause significant damage to the internal electronic components and insulation materials of the power supply, shortening the equipment's lifespan. Currently used voltage equalization devices are mostly limited to single-function designs; some focus solely on voltage equalization, others only on insulation performance, and still others primarily for spike absorption. This single-function design is insufficient to handle complex operating conditions and cannot simultaneously meet the requirements of insulation, voltage equalization, and spike absorption, creating safety hazards during operation and affecting the overall performance and reliability of the equipment.

[0004] Traditional high-voltage oil tanks typically employ metal casings. However, metal casings present numerous drawbacks under high-voltage environments. As metal is a good conductor, the electric field distribution on its surface is easily distorted under high voltage, leading to partial discharge and corona discharge. Partial discharge and corona discharge not only consume electrical energy but also gradually corrode the equipment's insulation materials, severely impacting its safety and withstand voltage performance, potentially causing insulation breakdown and serious electrical accidents. Furthermore, to ensure safe operation under high voltage, metal oil tanks require large air gaps to prevent breakdown and complex insulation structures to isolate components at different potentials. This directly results in a large equipment size, occupying more space. Moreover, the complex structural design and extensive material usage significantly increase manufacturing costs, placing a heavy economic burden on the production and application of power equipment. Summary of the Invention

[0005] To address the aforementioned issues, this invention proposes a peak absorption device for energy storage inverter-type high-voltage power supplies based on dual voltage equalization rings. This device can be used for high-voltage insulation support, peak voltage absorption, and electric field distribution optimization in energy storage inverter-type high-voltage power supplies. It is particularly suitable for high-voltage equipment with insulation levels above 200kV (such as transformers and reactors). Under high-voltage conditions, it can achieve high withstand voltage, optimized electric field uniformity, corona suppression, and transient overvoltage protection functions.

[0006] The technical solution adopted in this invention is as follows: A high-voltage power supply peak absorption device based on dual equalizing rings for energy storage inverters includes an oil tank assembly, a first equalizing ring, a second equalizing ring, a first support column, and a second support column. The first equalizing ring is disposed on the top of the oil tank assembly via multiple first support columns, and the second equalizing ring is disposed on the bottom of the oil tank assembly via multiple second support columns. The first equalizing ring, the second equalizing ring, and the center of the oil tank assembly are coaxial.

[0007] Furthermore, the energy storage inverter type high voltage power supply peak absorption device also includes a current-limiting resistor assembly, which is disposed on the surface of the oil tank cover of the oil tank assembly.

[0008] Furthermore, the current-limiting resistor assembly includes a current-limiting resistor wire, an insulating post, a support plate, and an insulating post. The current-limiting resistor wire is mounted on the support plate via the insulating post, and the support plate is mounted on the oil tank assembly via the insulating post.

[0009] Furthermore, the surface of the insulating column is provided with several uniformly arranged groove structures, and the support plate is provided with several elongated hole structures.

[0010] Furthermore, the insulating column is made of ceramic material, and the support plate and the insulating column are made of epoxy material.

[0011] Furthermore, the energy storage inverter-type high-voltage power supply peak absorption device also includes several rod-type post insulators, the top of which is connected to the oil tank assembly and the bottom is fixed to the base plate.

[0012] Furthermore, the rod-type post insulator includes a top metal material layer, a middle insulating material layer, and a bottom metal material layer connected in sequence.

[0013] Furthermore, the intermediate insulating material layer is configured as a multi-layer umbrella skirt structure, and the multi-layer umbrella skirt structure is evenly distributed.

[0014] Furthermore, the energy storage inverter type high voltage power supply peak absorption device also includes a terminal block, which is disposed on the surface of the tank cover of the tank assembly, and the tank assembly has wires entering and exiting through the terminal block.

[0015] Furthermore, the fuel tank assembly integrates a spike absorption circuit.

[0016] The beneficial effects of this invention are as follows: 1. This invention forms a symmetrical electric field through upper and lower equalizing rings, which synergistically improves the electric field distribution, effectively suppresses the potential gradient abrupt change of the suspended oil tank, reduces the risk of partial discharge, makes the voltage distribution uniform, and prevents local breakdown and damage.

[0017] 2. The combination of spike absorption circuit and oil immersion heat dissipation in the oil tank can solve the problems of large heat sink size and low efficiency in traditional solutions. This device has no flashover or breakdown under 200kV withstand voltage, reduces the peak voltage amplitude by 60%, and reduces the heat sink size by 30%, making it suitable for ultra-high voltage testing and other scenarios.

[0018] 3. After installing the double-layer equalizing ring, the calculated values ​​of the maximum electric field strength on the surface of the high-voltage end fittings and sheath of the insulator are all reasonable; the potential distribution along the surface of the insulator sheath also tends to be uniform; the calculated value of the maximum electric field strength on the surface of the high-voltage end equalizing ring is controlled below 20kV / cm, which can meet the requirement of not causing corona. Attached Figure Description

[0019] Figure 1 This is one of the structural schematic diagrams of a high-voltage power supply peak absorption device based on a dual voltage equalization ring according to Embodiment 1 of the present invention; Figure 2 This is a second schematic diagram of the structure of a high-voltage power supply peak absorption device based on a dual voltage equalization ring according to Embodiment 1 of the present invention; Figure 3 This is the third schematic diagram of the structure of a high-voltage power supply peak absorption device based on a dual voltage equalization ring according to Embodiment 1 of the present invention; Figure 4 This is an exploded view of a peak absorption device for an energy storage inverter type high-voltage power supply based on a dual voltage equalization ring, according to Embodiment 1 of the present invention. Figure 5 This is a schematic diagram of the equalizing ring structure in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the main structure of the fuel tank assembly according to Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the current-limiting resistor assembly structure according to Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the rod-type support insulator structure according to Embodiment 1 of the present invention.

[0020] Reference numerals in the attached drawings: 1-tank assembly, 2-current limiting resistor assembly, 3-terminal, 4-first equalizing ring, 5-second equalizing ring, 6-first support column, 7-second support column, 8-bar-type post insulator, 9-base plate; 201-current limiting resistor wire, 202-insulating column, 203-support plate, 204-insulating column. Detailed Implementation

[0021] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments are now described. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] Example 1 like Figures 1-4 As shown, this embodiment provides a high-voltage power supply peak absorption device based on dual equalizing rings, including an oil tank assembly, a first equalizing ring, a second equalizing ring, a first support column, and a second support column. The first equalizing ring is disposed on the top of the oil tank assembly through multiple first support columns, and the second equalizing ring is disposed on the bottom of the oil tank assembly through multiple second support columns. The first equalizing ring, the second equalizing ring and the center of the oil tank assembly are coaxial.

[0023] It should be noted that this embodiment achieves voltage equalization by setting equalizing rings on the upper and lower parts of the fuel tank assembly, which can evenly distribute high voltage around the object and ensure that there is no potential difference between different parts of the ring, thus achieving the effect of equalizing voltage. Specifically, by utilizing the large radius of curvature of the ring, surface charge is dispersed, reducing local field strength. The first and second equalizing rings form a mirror-symmetrical capacitive coupling, which cancels the non-uniform effect of a single ring, making the overall electric field distribution closer to the ideal state. By controlling the electric field gradient, air ionization is avoided, reducing corona discharge and radio frequency interference. In addition, the centers of the upper and lower equalizing rings are concentric with the center of the fuel tank, which makes the electric field uniform, and the smooth curved surface of the ring avoids point discharge and prevents corona generation.

[0024] Preferably, the first and second equalizing rings can be made of aluminum alloy with a polished surface. Figure 5 As shown, the first and second equalizing rings cover the entire oil tank. By optimizing their radius of curvature and installation spacing through simulation, the uniformity of electric field intensity can be improved by more than 30%.

[0025] More preferably, the equalizing ring can be manufactured by bending a round tube on a bending machine according to design requirements to form a closed-loop ring on a plane, and then welding the two ends of the round tube after bending.

[0026] Preferably, the oil tank assembly integrates a spike absorption circuit (such as an RCD network) and reduces temperature rise through oil immersion cooling.

[0027] Preferably, such as Figure 6As shown, the energy storage inverter type high voltage power supply peak absorption device also includes a terminal block, which is set on the surface of the oil tank cover of the oil tank assembly, and the oil tank assembly enters and exits through the terminal block.

[0028] Preferably, the energy storage inverter-type high-voltage power supply peak absorption device further includes a current-limiting resistor assembly, which is disposed on the surface of the tank cover of the tank assembly. Specifically, such as Figure 7 As shown, the current-limiting resistor assembly includes a current-limiting resistor wire, an insulating post, a support plate, and an insulating post. The current-limiting resistor wire is mounted on the support plate via the insulating post, and the support plate is mounted on the oil tank assembly via the insulating post.

[0029] More preferably, the surface of the insulating column is provided with several uniformly arranged groove structures, and the support plate is provided with several elongated hole structures.

[0030] More preferably, the insulating column can be made of high-strength ceramic material, which has good insulation performance and mechanical strength; the support plate and the insulating column can be made of epoxy material.

[0031] Preferably, the energy storage inverter-type high-voltage power supply peak absorption device further includes several rod-type post insulators, with the top of the rod-type post insulators connected to the oil tank assembly and the bottom fixed to the base plate. Specifically, such as Figure 8 As shown, the rod-type post insulator includes a top metal material layer, a middle insulation material layer, and a bottom metal material layer connected in sequence.

[0032] More preferably, the intermediate insulation material layer is configured as a multi-layer umbrella skirt structure, with the multi-layer umbrella skirt structure having a uniform voltage distribution, so that the oil tank has an insulation withstand voltage of 200kV, increases the creepage distance from the oil tank to the ground, and suppresses surface discharge.

[0033] More preferably, the base plate can adopt a channel steel frame structure, and through a multi-point grounding design combined with flexible conductive pads, the grounding can be reliably eliminated to eliminate the influence of mechanical vibration on the electric field distribution.

[0034] Example 2 This embodiment is based on embodiment 1: This embodiment provides an assembly method for a peak absorption device for an energy storage inverter based on dual voltage equalization rings, including the following steps: First, install the current-limiting resistor assembly and terminals on the oil tank cover of the oil tank assembly, and install the four sets of rod-type post insulators on the base plate; Then, the second equalizing ring is placed on the four sets of rod-type post insulators that have been installed. At this time, the oil tank assembly is installed on the post insulator, and the second equalizing ring and the oil tank assembly are connected through the second support column.

[0035] Finally, the first support column is installed on the fuel tank cover, and the first equalizing ring is installed on the fuel tank through the first support, thus completing the installation.

[0036] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed when using this invention. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

Claims

1. A high-voltage power supply peak absorption device based on a dual voltage equalization ring and an energy storage inverter, characterized in that, It includes a fuel tank assembly, a first equalizing ring, a second equalizing ring, a first support column, and a second support column. The first equalizing ring is disposed on the top of the fuel tank assembly via multiple first support columns, and the second equalizing ring is disposed on the bottom of the fuel tank assembly via multiple second support columns. The first equalizing ring and the second equalizing ring are coaxial with the center of the fuel tank assembly.

2. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 1, characterized in that, It also includes a current-limiting resistor assembly, which is disposed on the surface of the fuel tank cover of the fuel tank assembly.

3. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 2, characterized in that, The current-limiting resistor assembly includes a current-limiting resistor wire, an insulating column, a support plate, and an insulating column. The current-limiting resistor wire is mounted on the support plate via the insulating column, and the support plate is mounted on the oil tank assembly via the insulating column.

4. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 3, characterized in that, The surface of the insulating column is provided with several uniformly arranged groove structures, and the support plate is provided with several elongated hole structures.

5. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 3, characterized in that, The insulating column is made of ceramic material, and the support plate and the insulating column are made of epoxy material.

6. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 1, characterized in that, It also includes several rod-type post insulators, the top of which is connected to the oil tank assembly and the bottom is fixed to the base plate.

7. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 6, characterized in that, The rod-type post insulator includes a top metal material layer, a middle insulation material layer, and a bottom metal material layer connected in sequence.

8. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 7, characterized in that, The intermediate insulating material layer is configured as a multi-layer umbrella skirt structure, and the multi-layer umbrella skirt structure is evenly distributed.

9. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 1, characterized in that, It also includes a terminal block, which is disposed on the surface of the fuel tank cover of the fuel tank assembly, and the fuel tank assembly has wires entering and exiting through the terminal block.

10. The energy storage inverter-type high-voltage power supply peak absorption device based on dual voltage equalization rings according to claim 1, characterized in that, The fuel tank assembly integrates a spike absorption circuit.

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