Grid-connected intelligent control low-harmonic inverter

Abstract

This invention belongs to the field of inverter technology, specifically relating to a grid-connected intelligent control low-harmonic inverter. The invention features fixed bases on the outer surfaces of two opposite side plates of the inverter body. A cantilever support is hinged to the top of each base via a hinge shaft. The cantilever support is rotatably connected to the hinge shaft via a waist hole, and its top is also equipped with an overlapping plate wider than its width. Furthermore, the cantilever support is fixedly connected to a counterweight airbag. The counterweight airbag is inflatable, resulting in a small volume and light transport weight when deflated, significantly reducing the difficulty of transporting goods to remote areas. When inflated, its streamlined structure converts wind resistance into downward pressure, which, combined with the unfolded support of the cantilever support, achieves effective wind resistance. Simultaneously, the cantilever support can be folded within a 0-90° range relative to the fixed base. In its unfolded state, the cantilever support provides wind resistance; in its folded state, it facilitates transportation and storage.

Description

Technical Field

[0001] This invention belongs to the field of inverter technology, specifically relating to a grid-connected intelligent control low-harmonic inverter. Background Technology

[0002] Grid-connected intelligent control low-harmonic inverters are power electronic devices adapted to smart grid and distributed energy grid-connected scenarios. Their core function is to convert DC power generated by photovoltaic, energy storage, and other devices into clean AC power that meets grid standards through low-harmonic conversion technology. Then, through intelligent control, they achieve precise synchronization with the grid, adaptive operation, and remote regulation, ultimately enabling safe and efficient connection to the power system. Grid-connected intelligent control low-harmonic inverters ensure grid stability while maximizing the utilization of distributed energy resources. They are key core equipment for source-grid-load-storage synergy in power systems and their automation, and are widely used in distributed energy scenarios such as remote mountainous areas, islands, and communication base stations.

[0003] In related technologies, grid-connected intelligent control low-harmonic inverters are often used in harsh weather conditions such as strong winds and sandstorms. As a precision power electronic device, the inverter needs to have reliable wind resistance stability to avoid equipment damage and grid interruption caused by tipping or displacement. In practical use, the main way to solve the wind resistance problem is to install a fixed counterweight at the bottom of the inverter to improve stability by increasing its own weight.

[0004] However, traditional counterweights are solid, large in size and weight, resulting in high transportation costs and significant difficulties in transporting them to remote areas. Furthermore, their fixed structure occupies considerable space, causing numerous inconveniences during use. Summary of the Invention

[0005] The purpose of this invention is to provide a grid-connected intelligent control low-harmonic inverter to solve the problem of inconvenience in using a fixed counterweight block installed on the outside of the inverter in related technologies.

[0006] The specific technical solution adopted by this invention is as follows: A grid-connected intelligent control low-harmonic inverter, comprising: Inverter body; A fixed base is vertically fixed to the outer surface of the side plate of the inverter body, and a hinge shaft is provided at its top. A cantilever support member has a waist hole at its first end that is rotatably connected to the hinge shaft, forming a rotating pair that rotates around the hinge shaft; a bearing plate is also provided at the top of the cantilever support member, the width of the bearing plate being greater than the width of the cantilever support member; the cantilever support member has an unfolded state perpendicular to the fixed base and a retracted state parallel to the fixed base, and in the unfolded state, the cantilever support member overlaps the top of the fixed base through the bearing plate; Two counterweight airbags are symmetrically distributed on the outer surfaces of the two side plates of the inverter body and fixedly connected to the cantilever support. The top surface of the counterweight airbag after inflation is a smooth surface, and its bottom surface is a streamlined air pressure surface that bulges downward, so as to convert wind resistance into downward pressure and improve wind resistance stability.

[0007] Among the possible implementation methods is a counterweight shell; The counterweight shell is a frame structure with a closed top and an open bottom. It is fitted onto the inverter body through the open bottom, and its top plate abuts against the top surface of the inverter body. The fixing base is fixed to the outer surface of the side plate of the counterweight shell by bolts.

[0008] In some possible implementations, the second end of the cantilever support is hinged to a connecting plate, the side of the connecting plate away from the cantilever support being detachably and fixedly connected to the counterweight airbag.

[0009] In some possible implementations, the cantilever support and the connecting base plate are provided with coaxial pentagonal holes at their hinge joints, and pentagonal shafts are inserted into the pentagonal holes to lock the hinge base plate at a preset angle.

[0010] In some possible implementations, the two opposite side plates of the counterweight shell have side openings, the positions of which correspond one-to-one with the wiring holes and heat dissipation holes of the inverter body.

[0011] In some possible implementations, the bottom of the counterweight shell side plate extends outward in a horizontal direction to form an overlapping plate, the bottom surface of which is coplanar with the bottom surface of the inverter body to increase the contact area.

[0012] In some possible implementations, the bottom of the fixed base abuts against the top surface of the overlapping plate, the bottom of the fixed base is provided with a downwardly extending positioning plate, the overlapping plate is provided with a positioning hole adapted to the positioning plate along the thickness direction, and the positioning plate is embedded in the positioning hole to realize the positioning and pull-out limiting of the fixed base.

[0013] In some possible implementations, the fixed base consists of a base plate and side plates perpendicular to both sides. The width of the base plate is greater than the distance between the two side plates. A reinforcing rib is provided in the right-angle region formed by the side plates and the base plate. The reinforcing rib is used to resist the lateral tilting of the side plates when subjected to external forces.

[0014] In some possible implementations, the counterweight airbag is provided with a first windward end and a second windward end along its length, both of which are connected to the streamlined air pressure surface arc to form a complete streamlined windward surface.

[0015] In some possible implementations, the counterweight airbag is made of weather-resistant nylon-coated fabric, the smooth outer surface is coated with an anti-UV coating, and the streamlined air pressure surface is provided with an abrasion-resistant coating.

[0016] The technical effects achieved by this invention are as follows: This invention features fixed bases on the outer surfaces of two opposite side plates of the inverter body. A cantilever support is hinged to the top of each base via a hinge shaft. The cantilever support is rotatably connected to the hinge shaft via a waist hole, and its top is also equipped with an overlapping plate wider than its width. Furthermore, the cantilever support is fixedly connected to a counterweight airbag. The counterweight airbag is inflatable, resulting in a small volume and light transport weight when deflated, significantly reducing the difficulty of transporting goods to remote areas. When inflated, its streamlined structure converts wind resistance into downward pressure, which, combined with the unfolded support of the cantilever support, achieves effective wind resistance. Simultaneously, the cantilever support can fold within a 0-90° range relative to the fixed base. In its unfolded state, the cantilever support provides wind resistance; in its folded state, it facilitates transportation and storage. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the grid-connected intelligent control low-harmonic inverter provided by the present invention. Figure 2 yes Figure 1 Assembly diagram of the fixed base and cantilever support; Figure 3 yes Figure 1 A schematic diagram of the central counterweight airbag in its inflated state; Figure 4 yes Figure 1 Assembly diagram of the fixed base and cantilever support; Figure 5 yes Figure 4 Exploded view of the fixed base and cantilever support; Figure 6 This is a schematic diagram before the fixed base and cantilever support are in the locked state; Figure 7This is a schematic diagram showing the fixed base and cantilever support in a closed state. Figure 8 This is a schematic diagram of the counterweight airbag in this invention; Figure 9 This is an exploded view of the counterweight shell and the inverter body in another embodiment of the present invention; Figure 10 This is an exploded view of the cantilever support and the connecting substrate in another embodiment of the present invention; Figure 11 This is a schematic diagram of the assembly of the counterweight shell, the fixed base, and the cantilever support in another embodiment of the present invention. Figure 12 This is a schematic diagram of the structure of the fixed base in another embodiment of the present invention; Figure 13 This is an exploded view of the assembly of the fixed base and the counterweight shell in another embodiment of the present invention.

[0018] The attached diagram lists the components represented by each number as follows: 100. Inverter body; 110. Plug in; 120. Heat dissipation hole; 200. Fixed base; 210. Hinge shaft; 220. Base plate; 230. Side plate; 240. Reinforcing rib; 250. Positioning plate; 300. Cantilever support; 310. Waist hole; 320. Bearing plate; 400. Counterweight airbag; 410. Smooth surface; 420. Streamlined air pressure surface; 430. First windward end; 440. Second windward end; 450. Streamlined windward surface; 500, Counterweight shell; 510, Bottom opening; 520, Side opening; 530, Overlapping plate; 531, Positioning hole; 600, Connecting substrate; 700, Plum blossom hole; 800, Plum Blossom Axe; 900, star-shaped handle. Detailed Implementation

[0019] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0020] like Figure 1-8As shown, this embodiment of the invention provides a grid-connected intelligent control low-harmonic inverter, which includes an inverter body 100, a fixed base 200, a cantilever support 300, and a counterweight airbag 400. The inverter body 100 has a cuboid structure and is used to convert DC power to low-harmonic AC power and perform grid-connected intelligent control. The inverter body 100 is made of an aluminum alloy shell and integrates a low-harmonic inverter module, an intelligent grid-connected control module, and a cooling fan. The fixed base 200 is bolted to the outer surfaces of two opposite side plates 230 of the inverter body 100 and is vertically mounted on the inverter body 100. Furthermore, a hinge shaft 210 is provided at the top of the fixed base 200.

[0021] The cantilever support 300 is rotatably mounted on top of the fixed base 200 via a hinge shaft 210. It can rotate relative to the fixed base 200 around the hinge shaft 210, with the rotation range controlled between 0 and 90°. That is, when the cantilever support 300 and the fixed base 200 are perpendicular to each other, the included angle between them is 90°; conversely, when the cantilever support 300 coincides with the fixed base 200, the included angle between them is 0°.

[0022] Specifically, the first end of the cantilever support 300 has a waist hole 310, which extends along the length of the cantilever support 300. The cantilever support 300 is rotatably connected to the hinge shaft 210 through the waist hole 310, forming a revolute joint that rotates around the hinge shaft 210. A bearing plate 320 is also provided on the top of the cantilever support 300. The width of the bearing plate 320 is greater than the width of the cantilever support 300. That is, the two outer edges of the bearing plate 320 in the width direction protrude outwards relative to the two side plates 230 of the cantilever support 300.

[0023] Continue as Figures 4-7 As shown, the cantilever support 300 has an extended state and a retracted state, which are adapted to an angle range of 0-90°. Specifically, when the cantilever support 300 is in the extended state, it is perpendicular to the fixed base 200, with an angle of 90° between them, and the cantilever support 300 overlaps the top of the fixed base 200 via the top support plate 320. Conversely, when the cantilever support 300 is in the retracted state, it is parallel to the fixed base 200, with an angle of 0° between them.

[0024] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 8As shown, counterweight airbags 400 are respectively disposed on both sides of the inverter body 100 and fixedly connected to the cantilever support 300. The counterweight airbags 400 can be heat-formed using weather-resistant nylon coated fabric. When the counterweight airbags 400 are inflated, their top surface is a smooth surface 410, and their bottom surface is a downwardly convex streamlined pressure surface 420, with the streamlined pressure surface 420 facing the prevailing wind direction. An inflation valve and an deflation valve (not shown in the figure) are provided on one side of the counterweight airbags 400 for inflation and deflation operations.

[0025] Preferably, the counterweight airbag 400 can be bolted to the cantilever support 300 via a pre-set metal connecting piece, and a high-strength adhesive can also be used to further secure the connection to ensure reliability. The inflation valve of the counterweight airbag 400 is used to connect to an air pump for timely inflation.

[0026] The following is combined Figures 1-8 The working principle and working process of the grid-connected intelligent control low-harmonic inverter provided by the invention are described.

[0027] Working principle: The cantilever support 300 forms a rotating pair with the hinge shaft 210 of the fixed base 200 through the waist hole 310, allowing it to rotate freely within a range of 0-90°. When the cantilever support 300 is in the extended state, it is perpendicular to the fixed base 200 and overlaps the top of the fixed base 200 through the bearing plate 320 to form a stable triangular support structure, thereby providing reliable support for the counterweight airbag 400. When the cantilever support 300 is in the retracted state, it is parallel to the fixed base 200 and fits against the fixed base 200. Combined with the deflated state of the counterweight airbag 400, the overall volume of the equipment can be significantly reduced, thus facilitating transportation and storage.

[0028] After inflation, the counterweight airbag 400 forms a smooth top surface 410 and a downwardly convex streamlined pressure surface 420. When strong winds act on the counterweight airbag 400, it guides the airflow along the surface and generates downward aerodynamic pressure on the streamlined pressure surface 420 (according to Bernoulli's principle, the airflow velocity increases and the pressure decreases when flowing over the convex surface, forming a pressure difference with the static pressure on the bottom surface, generating a downward pressure component). At the same time, the weight of the counterweight airbag 400 after inflation is superimposed with the aerodynamic pressure, thereby forming a total downward gravity to effectively resist the overturning moment generated by the wind load and prevent the inverter body 100 from tipping over in strong winds.

[0029] Work process: Fully deflate the counterweight airbag 400, then rotate the cantilever support 300 to its retracted state. At this point, the inverter body 100 is at its smallest size, facilitating loading and transportation. Upon arrival at the installation site, place the inverter body 100 on the pre-designated mounting surface, ensuring its bottom surface is flush with the surface. Then, rotate the cantilever support 300 to its extended state and attach the support plate 320 to the top of the fixed base 200. Connect the air pump to the inflation valve of the counterweight airbag 400, inflate to 0.5 MPa (standard operating condition), and then close the inflation valve to complete the installation and commissioning of the counterweight airbag 400. Connect external DC power, grid AC power, and communication lines to the inverter body 100 through the connector 110 to start the inverter body 100 and achieve low-harmonic inversion and grid-connected operation.

[0030] When encountering strong winds, the strong winds will generate downward aerodynamic pressure after passing through the counterweight airbag 400, and will overlap with the counterweight airbag 400 to form a downward pressure force. Combined with the stable support of the cantilever support 300, it can resist the overturning moment of the wind load and prevent the inverter from tipping over or shifting.

[0031] When grid connection operation ends or the inverter body 100 needs to be moved, first shut down the inverter body 100 and disconnect all connecting wires. Open the exhaust valve of the counterweight airbag 400, and after it is completely deflated, rotate the cantilever support 300 to the retracted position. If the counterweight airbag 400 is damaged, it can be replaced by unscrewing the connecting bolts.

[0032] This invention features fixed bases 200 fixedly mounted on the outer surfaces of two opposing side plates 230 of the inverter body 100. A cantilever support 300 is hinged to the top of each fixed base 200 via a hinge shaft 210. The cantilever support 300 is rotatably connected to the hinge shaft 210 via a waist hole 310. The top of the cantilever support 300 also has an overlapping plate 530 wider than its width. Furthermore, the cantilever support 300 is fixedly connected to a counterweight airbag 400. The counterweight airbag 400 is inflatable, resulting in a small volume and light transport weight when deflated, significantly reducing the difficulty of transporting goods to remote areas. When inflated, its streamlined structure converts wind resistance into downward pressure, which, combined with the unfolded support of the cantilever support 300, provides effective wind resistance. Simultaneously, the cantilever support 300 can be folded relative to the fixed base 200 within a 0-90° range. In its unfolded state, the cantilever support 300 provides wind resistance, while its folded state facilitates transportation and storage.

[0033] In some embodiments, such as Figure 9 and Figure 11As shown, the system also includes a counterweight shell 500, which is a frame structure with a closed top and a bottom opening 510. The counterweight shell 500 can be welded from Q235 cold-rolled steel sheet and is fitted onto the inverter body 100 through the bottom opening 510. Its top plate abuts against the top surface of the inverter body 100, and the fixing base 200 is fixed to the outer surface of the side plate 230 of the counterweight shell 500 by bolts. The counterweight shell 500 has no fixed structure; it is relatively fixed to the inverter body 100 only through its own weight and the fitting together. Furthermore, the two opposite side plates 230 of the counterweight shell 500 have side openings 520, the positions of which correspond one-to-one with the wiring holes 110 and heat dissipation holes 120 of the inverter body 100.

[0034] By providing a counterweight shell 500 over the inverter body 100, the downward pressure of the inverter body 100 can be increased, and it can also be directly fixed to the fixed base 200 by bolts, so as not to damage the structure of the inverter body 100 itself.

[0035] Based on the above embodiments, such as Figures 11-13 As shown, the bottom of the side plate 230 of the counterweight shell 500 extends outward in a horizontal direction to form an overlapping plate 530. The bottom surface of the overlapping plate 530 is coplanar with the bottom surface of the inverter body 100 to increase the contact area. Through the above design, the inverter body 100 can be prevented from sinking on soft ground, and its overall anti-slip ability can also be improved.

[0036] Preferably, the bottom of the fixed base 200 abuts against the top surface of the overlapping plate 530. A downwardly extending positioning plate 250 is provided at the bottom of the fixed base 200. The overlapping plate 530 has positioning holes 531 along its thickness direction that are compatible with the positioning plate 250. The positioning plate 250 is embedded in the positioning holes 531 to achieve positioning and pull-out limiting of the fixed base 200. In this way, under strong wind conditions, the downward pressure of the counterweight airbag 400 will be transmitted sequentially through the cantilever support 300, the fixed base 200, and the overlapping plate 530 to the preset mounting surface, thereby further improving the counterweight effect and ensuring that the inverter body 100 does not fail under extreme wind loads.

[0037] In some embodiments, such as Figure 12 As shown, the fixed base 200 consists of a base plate 220 and side plates 230 perpendicular to both sides. The width of the base plate 220 is greater than the distance between the two side plates 230. A reinforcing rib 240 is provided in the right-angle region formed by the side plates 230 and the base plate 220. The reinforcing rib 240 is used to resist the lateral tilting of the side plates 230 under external forces. By welding the triangular reinforcing rib 240 to the right-angle region between the side plates 230 and the base plate 220, the lateral bending stiffness of the side plates 230 can be improved, thereby ensuring that the fixed base 200 does not deform or break under repeated wind load cycles and greatly extending its service life.

[0038] In some embodiments, such as Figure 10 As shown, a connecting plate 600 is hinged to the second end of the cantilever support 300. The side of the connecting plate 600 away from the cantilever support 300 is detachably and fixedly connected to the counterweight airbag 400. Coaxial pentagonal holes 700 are provided at the hinge points of the cantilever support 300 and the connecting plate 600. A pentagonal shaft 800 is inserted into the pentagonal holes 700 to lock the hinge plate at a preset angle.

[0039] The swivel shaft 800 can be inserted into swivel holes 700 at different angles, locking the connecting base plate 600 at any preset angle from 0 to 90°. This allows the counterweight airbag 400 to adjust its windward posture according to the dominant risk on site, thereby maximizing the aerodynamic downward pressure component and improving the anti-tipping capability of the inverter body 100. Preferably, the end of the swivel shaft 800 can be provided with a convenient star-shaped handle 900.

[0040] In some embodiments, such as Figure 8 As shown, the counterweight airbag 400 has a first windward end 430 and a second windward end 440 along its length, both of which are connected to the streamlined air pressure surface 420 by an arc transition to form a complete streamlined windward surface 450. The counterweight airbag 400 is made of weather-resistant nylon coated fabric, the outer surface of the smooth surface 410 is coated with an anti-ultraviolet coating, and the surface of the streamlined air pressure surface 420 is provided with a wear-resistant coating.

[0041] The first windward end 430 and the second windward end 440 are connected by an arc transition to the streamlined pressure surface 420, forming a complete streamlined windward surface 450 without sharp edges, which can greatly reduce the drag coefficient. Simultaneously, this structure allows airflow to flow smoothly along the surface of the counterweight airbag 400, thus avoiding stress concentration caused by localized eddies. The weather-resistant nylon-coated fabric can withstand a certain range of high and low temperature cycles, reducing the occurrence of brittleness and aging. The UV-resistant coating can resist strong ultraviolet radiation, thus preventing widespread fading and discoloration, making it suitable for high-radiation environments such as high-altitude areas and islands.

[0042] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A grid-connected intelligent control low-harmonic inverter, characterized in that, include: Inverter body; A fixed base is vertically fixed to the outer surface of the side plate of the inverter body, and a hinge shaft is provided at its top. A cantilever support member has a waist hole at its first end that is rotatably connected to the hinge shaft, forming a rotating pair that rotates around the hinge shaft; a bearing plate is also provided at the top of the cantilever support member, the width of the bearing plate being greater than the width of the cantilever support member; the cantilever support member has an unfolded state perpendicular to the fixed base and a retracted state parallel to the fixed base, and in the unfolded state, the cantilever support member overlaps the top of the fixed base through the bearing plate; Two counterweight airbags are symmetrically distributed on the outer surfaces of the two side plates of the inverter body and fixedly connected to the cantilever support. The top surface of the counterweight airbag after inflation is a smooth surface, and its bottom surface is a streamlined air pressure surface that bulges downward, so as to convert wind resistance into downward pressure and improve wind resistance stability.

2. The grid-connected intelligent control low-harmonic inverter according to claim 1, characterized in that: It also includes a counterweight shell; The counterweight shell is a frame structure with a closed top and an open bottom. It is fitted onto the inverter body through the open bottom, and its top plate abuts against the top surface of the inverter body. The fixing base is fixed to the outer surface of the side plate of the counterweight shell by bolts.

3. The grid-connected intelligent control low-harmonic inverter according to claim 2, characterized in that: The second end of the cantilever support is hinged to a connecting base plate, and the side of the connecting base plate away from the cantilever support is detachably and fixedly connected to the counterweight airbag.

4. The grid-connected intelligent control low-harmonic inverter according to claim 3, characterized in that: The cantilever support and the connecting base plate are provided with coaxial quincunx holes at their hinge joints. A quincunx shaft is inserted into the quincunx holes to lock the hinge base plate at a preset angle.

5. The grid-connected intelligent control low-harmonic inverter according to claim 2, characterized in that: The counterweight shell has two opposite side plates with side openings, and the positions of the side openings correspond one-to-one with the wiring holes and heat dissipation holes of the inverter body.

6. The grid-connected intelligent control low-harmonic inverter according to claim 2, characterized in that: The bottom of the counterweight shell side plate extends outward in a horizontal direction to form an overlapping plate, and the bottom surface of the overlapping plate is coplanar with the bottom surface of the inverter body to increase the contact area.

7. The grid-connected intelligent control low-harmonic inverter according to claim 6, characterized in that: The bottom of the fixed base abuts against the top surface of the overlapping plate. The bottom of the fixed base is provided with a downwardly extending positioning plate. The overlapping plate has a positioning hole adapted to the positioning plate along the thickness direction. The positioning plate is embedded in the positioning hole to realize the positioning and pull-out limit of the fixed base.

8. The grid-connected intelligent control low-harmonic inverter according to claim 1, characterized in that: The fixed base consists of a base plate and side plates perpendicular to both sides. The width of the base plate is greater than the distance between the two side plates. A reinforcing rib is provided in the right-angle area formed by the side plates and the base plate. The reinforcing rib is used to resist the lateral tilting of the side plates when subjected to external forces.

9. The grid-connected intelligent control low-harmonic inverter according to claim 1, characterized in that: The counterweight airbag has a first windward end and a second windward end along its length, both of which are connected to the streamlined air pressure surface arc to form a complete streamlined windward surface.

10. The grid-connected intelligent control low-harmonic inverter according to claim 1, characterized in that: The counterweight airbag is made of weather-resistant nylon coated fabric, the smooth outer surface is coated with an anti-ultraviolet coating, and the streamlined air pressure surface is provided with a wear-resistant coating.

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