A photovoltaic transmission and distribution cable for smart grids

Abstract

This application relates to the field of photovoltaic transmission cable technology, and provides a photovoltaic transmission and distribution cable for smart grids, including a power unit, multiple control units, multiple signal units, an isolation shielding layer, an inner sheath, and an outer sheath. The isolation shielding layer, inner sheath, and outer sheath are arranged sequentially from the inside to the outside of the power unit. Multiple control units and signal units are evenly distributed circumferentially in alternating patterns within the gap between the power unit and the isolation shielding layer. The photovoltaic transmission and distribution cable for smart grids according to this application enables large spans and long-distance cable installation, integrating power transmission, control signal transmission, and communication signal transmission functions into one unit. While improving the safety and stability of photovoltaic transmission, it significantly improves line resource utilization, reduces construction and maintenance costs, reduces photovoltaic energy loss during transmission, and better adapts to the intermittent and fluctuating characteristics of photovoltaic power generation.

Description

Technical Field

[0001] This application relates to the field of photovoltaic transmission cable technology, and in particular to a photovoltaic transmission and distribution cable for smart grids. Background Technology

[0002] Photovoltaic power generation, as a highly efficient, clean, and renewable energy source, is an important option for gradually replacing traditional coal-fired power. Ensuring the safe, efficient, and controllable connection of photovoltaic energy from the generation end to the power grid is a crucial step in absorbing clean energy and optimizing the energy structure, and is also one of the core tasks in building a smart and green power grid.

[0003] Currently, existing photovoltaic (PV) grid connection methods mainly include two types: overhead insulated cables and PV cables. Overhead insulated cables are erected via poles and towers, enabling long-distance power transmission to some extent. However, their significant weight presents numerous challenges when erecting them over long spans and distances, including issues such as the load-bearing capacity of the poles, line stability, and the complexity of construction and maintenance. PV cables, on the other hand, are laid via ground-level pipelines. While this avoids some of the problems associated with overhead lines, laying ground-level pipelines in complex terrain conditions, such as mountainous areas, rivers, and lakes, presents significant difficulties and is susceptible to geological disasters and human-caused damage, leading to reduced reliability and safety. Furthermore, PV power generation and transmission lines are typically located in areas with high solar radiation, large diurnal temperature variations, and harsh environmental conditions. Therefore, how to efficiently and accurately monitor the lines and associated power generation terminals, and integrate signal transmission functions within the same transmission line, has become a key research focus and an urgent problem to be solved. Traditional monitoring methods often rely on distributed sensors and independent communication lines, which not only increases system complexity and cost but also suffers from deficiencies in the real-time performance and accuracy of data transmission.

[0004] Chinese patent CN103137258A discloses a photovoltaic composite power cable for smart grids. In this patent, an insulation layer is wrapped around a copper conductor to form a wire. The wire, a polypropylene filler layer, and an optical unit are twisted together to form a cable core. The cable core is surrounded from the inside out by a wrapping layer, an inner sheath, an armor layer, and an outer sheath. This cable is used to integrate optical fiber and low-voltage power cable into a single line when the power distribution line enters a household. However, this cable cannot be used for high-altitude installations of photovoltaic power generation, nor can it be used for laying in complex terrain.

[0005] Therefore, developing a photovoltaic transmission line that can adapt to complex environmental conditions and integrate multiple functions is of great significance for improving the grid connection efficiency of photovoltaic power generation and the level of intelligent grid operation. Utility Model Content

[0006] In view of this, in order to overcome the shortcomings of the prior art, this application aims to provide a photovoltaic transmission and distribution cable for smart grids.

[0007] This application provides a photovoltaic transmission and distribution cable for smart grids. The transmission and distribution cable for smart grids includes a power unit, multiple control units, multiple signal units, an isolation shielding layer, an inner sheath, and an outer sheath. The isolation shielding layer, the inner sheath, and the outer sheath are arranged sequentially from the inside to the outside of the power unit. Multiple control units and signal units are evenly distributed in a circular pattern in the gap between the power unit and the isolation shielding layer.

[0008] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the power unit consists of a load-bearing member and a power conductor, a first insulation layer, and a second insulation layer arranged sequentially from the inside to the outside of the load-bearing member.

[0009] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the power conductor is composed of multiple conductor rings from the inside out, and each conductor ring is made of multiple conductors with a trapezoidal cross section twisted together.

[0010] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the control unit includes a control sheath and two control cores, which are symmetrically arranged within the control sheath.

[0011] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the control sheath includes a first sleeve, a second sleeve, and a connecting part. The first sleeve and the second sleeve are integrally connected through the connecting part, and the control cores are respectively assembled in the first sleeve and the second sleeve.

[0012] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the control core consists of a control conductor and a control shielding layer and a control insulation layer arranged sequentially from the inside to the outside of the control conductor.

[0013] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the connection portion of the control sheath is an arc shape bent to one side.

[0014] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the connecting part is coaxial with the power unit.

[0015] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the signal unit includes multiple optical fiber cores, optical fiber filling paste, optical fiber sheath, and signal sheath. The optical fiber cores are disposed in the optical fiber filling paste inside the optical fiber sheath, and the signal sheath covers the outside of the optical fiber sheath.

[0016] Optionally, in the photovoltaic transmission and distribution cable for smart grids of this application, the thickness of the isolation shielding layer, the inner sheath, and the outer sheath increases sequentially.

[0017] The photovoltaic transmission and distribution cable for smart grids proposed in this application, through comprehensive structural design, has the following beneficial technical effects:

[0018] 1. The power unit ensures power transmission while maintaining the sag characteristics of the overall cable assembly, enabling large spans and long-distance cable installation, and making it suitable for more complex application environments.

[0019] 2. It integrates power transmission, control signal transmission and communication signal transmission functions into one, which improves the safety and stability of photovoltaic transmission, significantly increases the utilization rate of line resources, and reduces construction and maintenance costs.

[0020] 3. Through efficient power transmission and intelligent monitoring and control, the loss of photovoltaic energy during transmission can be reduced, better adapting to the intermittent and fluctuating characteristics of photovoltaic power generation, improving the utilization rate of photovoltaic energy, promoting the consumption of clean energy, providing strong support for building a smart green grid, and promoting the optimization and sustainable development of the energy structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural example diagram of a photovoltaic transmission and distribution cable for a smart grid according to an embodiment of this application;

[0023] Figure 2 This is a structural example diagram of a power unit for a photovoltaic transmission and distribution cable for a smart grid according to an embodiment of this application;

[0024] Figure 3 This is a structural example diagram of a control unit according to an embodiment of this application;

[0025] Figure 4 This is a structural example diagram of the control cover of the control unit according to an embodiment of this application;

[0026] Figure 5 This is a partial structural example of the control sheath according to an embodiment of this application;

[0027] Figure 6 This is a structural example diagram of a signal unit according to an embodiment of this application;

[0028] In the diagram, 1-Power unit, 2-Control unit, 3-Signal unit, 4-Isolation shielding layer, 5-Inner sheath, 6-Outer sheath, 11-Bearing component, 12-Power conductor, 13-First insulation layer, 14-Second insulation layer, 21-Control sheath, 22-Control core, 211-First tube sleeve, 212-Second tube sleeve, 213-Connector, 221-Control conductor, 222-Control shielding layer, 223-Control insulation layer, 31-Fiber optic core, 32-Fiber optic filling paste, 33-Fiber optic tube sleeve, 34-Signal sheath. Detailed Implementation

[0029] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0030] It should be noted that, in the absence of conflict, the following embodiments and features can be combined with each other; and, based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0031] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0032] Figure 1 This is a structural example diagram of a photovoltaic transmission and distribution cable for a smart grid according to an embodiment of this application, as shown below. Figure 1 As shown, in this embodiment, the power transmission and distribution cable for smart grids includes a power unit 1, multiple control units 2, multiple signal units 3, an isolation shielding layer 4, an inner sheath 5, and an outer sheath 6. The isolation shielding layer 4, the inner sheath 5, and the outer sheath 6 are arranged sequentially from the inside to the outside of the power unit 1. The multiple control units 2 and signal units 3 are evenly distributed in a circular pattern in the gap between the power unit 1 and the isolation shielding layer 4.

[0033] Figure 2 This is a structural example diagram of a power unit for a photovoltaic transmission and distribution cable for a smart grid according to an embodiment of this application, as shown below. Figure 1 and Figure 2As shown, in this embodiment, the power unit 1 consists of a load-bearing component 11 and power conductors 12, a first insulation layer 13, and a second insulation layer 14 arranged sequentially from the inside out on the outside of the load-bearing component 11. In this embodiment, the power conductor consists of multiple conductor rings from the inside out. Each conductor ring is made of multiple stranded wires with a trapezoidal cross-section, which can improve the tightness of the power conductor 12 and reduce the outer diameter of the conductor while maintaining the same conductor cross-section, thereby reducing the overall size and weight of the cable. This embodiment further enhances the insulation performance of the cable through the double-insulation structure, ensuring the safety and stability of power transmission, and can operate reliably even under high temperature, high voltage, and high current conditions. In practical applications, the components of the power unit 1 in this embodiment can be specifically selected according to the actual line parameters. For example, the load-bearing component 11 can be made of high-strength steel core or Invar core stranded together, the power conductor 12 can be made of 8000 series aluminum alloy or electrical aluminum material, and the first insulation layer 13 and the second insulation layer 14 can be made of cross-linked polyethylene material or cross-linked polyolefin material.

[0034] Figure 3 This is a structural example diagram of a control unit according to an embodiment of this application. Figure 4 This is a structural example diagram of the control cover of the control unit according to an embodiment of this application, as shown below. Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the control unit 2 includes a control sheath 21 and two control wire cores 22, which are symmetrically arranged within the control sheath 21.

[0035] As an optional example, the control sheath 21 includes a first sleeve 211, a second sleeve 212, and a connecting portion 213. The first sleeve 211 and the second sleeve 212 are integrally connected through the connecting portion 213, and the control core 22 is respectively assembled inside the first sleeve 211 and the second sleeve 212. As an optional example, the control core 22 in this embodiment consists of a control conductor 221 and a control shielding layer 222 and a control insulation layer 223 arranged sequentially from the inside to the outside of the control conductor 221.

[0036] Figure 5 This is a partial structural example diagram of the control sheath according to an embodiment of this application, such as... Figures 1 to 5 As shown, in this embodiment, the connecting portion 213 of the control sheath 21 is an arc shape that bends to one side, and the connecting portion 213 is coaxial with the power unit 1.

[0037] In this embodiment, the components of the control unit 2 can be specifically selected according to the actual circuit parameters. For example, the control conductor 221 is made of 8000 series aluminum alloy or annealed soft electrolytic copper, the control shielding layer 222 is made of a semi-conductive polymer such as semi-conductive cross-linked polyethylene, and the control insulation layer 223 is made of cross-linked polyethylene or silicone rubber. The control sheath 21 is made of polyvinyl chloride. By symmetrically arranging the two control cores 22 within the control sheath 21, the stability of the control cores 22 in the cable structure is improved, while the connection convenience between the control unit 2 and the control application terminal is also improved.

[0038] In this embodiment, the introduction of control unit 2 provides crucial support for the intelligent operation of the cable. Control core 22 can collect various parameters (such as current, voltage, and temperature) during the operation of the cable and associated power generation equipment in real time, and achieve precise regulation of the cable and associated equipment's operating status through control signals. For example, when local overheating or abnormal current is detected, control unit 2 can promptly issue an alarm and take corresponding measures to effectively prevent faults and improve the cable's safety and service life.

[0039] Figure 6 This is a structural example diagram of a signal unit according to an embodiment of this application, such as... Figure 1 and Figure 6 As shown, in this embodiment, the signal unit 3 includes multiple optical fiber cores 31, optical fiber filler 32, optical fiber sheath 33, and a signal sheath 34. The optical fiber cores 31 are disposed within the optical fiber filler 32 inside the optical fiber sheath 33, and the signal sheath 34 covers the outside of the optical fiber sheath 33. The signal unit 3 of this embodiment can provide a high-speed, stable, and low-loss communication signal transmission channel in photovoltaic power transmission lines. The high bandwidth characteristics of the optical fiber cores 31 can meet the needs of large-scale data transmission in smart grids, such as power metering data, equipment status information, and dispatch instructions. Simultaneously, optical fiber communication has strong anti-electromagnetic interference capabilities, maintaining the stability and reliability of communication signals in power transmission environments, providing strong support for bidirectional interaction and multi-network convergence services in smart grids.

[0040] In this embodiment, the thicknesses of the isolation shielding layer 4, the inner sheath 5, and the outer sheath 6 increase sequentially. The isolation shielding layer 4 effectively prevents external electromagnetic interference from affecting the internal signal transmission of the cable, while also shielding the electromagnetic radiation generated by the cable itself, reducing interference to the surrounding environment. In practical applications, the isolation shielding layer 4 is made of copper tape. The multi-layered structure design of the inner sheath 5 and the outer sheath 6 enhances the cable's tensile, compressive, and corrosion resistance, enabling it to adapt to complex terrains and harsh environmental conditions, such as high altitudes, large temperature differences, and strong winds and sandstorms. The inner sheath 5 can be made of polyvinyl chloride, and the outer sheath 6 can be made of cross-linked polyolefin.

[0041] In practical applications, the photovoltaic transmission and distribution cable for smart grids in this embodiment, through comprehensive structural design, has the following beneficial technical effects:

[0042] 1. The power unit ensures power transmission while maintaining the sag characteristics of the overall cable assembly, enabling large spans and long-distance cable installation, and making it suitable for more complex application environments.

[0043] 2. It integrates power transmission, control signal transmission and communication signal transmission functions into one, which improves the safety and stability of photovoltaic transmission, significantly increases the utilization rate of line resources, and reduces construction and maintenance costs.

[0044] 3. Through efficient power transmission and intelligent monitoring and control, the loss of photovoltaic energy during transmission can be reduced, better adapting to the intermittent and fluctuating characteristics of photovoltaic power generation, improving the utilization rate of photovoltaic energy, promoting the consumption of clean energy, providing strong support for building a smart green grid, and promoting the optimization and sustainable development of the energy structure.

[0045] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A photovoltaic transmission and distribution cable for smart grids, characterized in that, The power transmission and distribution cable for the smart grid includes a power unit, multiple control units, multiple signal units, an isolation shielding layer, an inner sheath, and an outer sheath. The isolation shielding layer, the inner sheath, and the outer sheath are arranged sequentially from the inside to the outside of the power unit. Multiple control units and signal units are evenly distributed in a circular pattern in the gap between the power unit and the isolation shielding layer.

2. The photovoltaic transmission and distribution cable for smart grids according to claim 1, characterized in that, The power unit consists of a load-bearing component and, from the inside out, a power conductor, a first insulation layer, and a second insulation layer arranged sequentially on the outside of the load-bearing component.

3. The photovoltaic transmission and distribution cable for smart grids according to claim 2, characterized in that, The electric conductor consists of multiple layers of conductor rings from the inside out, and each layer of conductor ring is made of multiple wires with a trapezoidal cross section twisted together.

4. The photovoltaic transmission and distribution cable for smart grids according to claim 1, characterized in that, The control unit includes a control sheath and two control conductors, which are symmetrically arranged within the control sheath.

5. The photovoltaic transmission and distribution cable for smart grids according to claim 4, characterized in that, The control sheath includes a first sleeve, a second sleeve, and a connecting part. The first sleeve and the second sleeve are integrally connected by the connecting part, and the control cores are respectively assembled in the first sleeve and the second sleeve.

6. The photovoltaic transmission and distribution cable for smart grids according to claim 5, characterized in that, The control conductor consists of a control conductor and a control shielding layer and a control insulation layer arranged sequentially from the inside to the outside of the control conductor.

7. The photovoltaic transmission and distribution cable for smart grids according to claim 6, characterized in that, The connection of the control layer is an arc shape that bends to one side.

8. The photovoltaic transmission and distribution cable for smart grids according to claim 7, characterized in that, The connecting part is coaxial with the power unit.

9. The photovoltaic transmission and distribution cable for smart grids according to claim 1, characterized in that, The signal unit includes multiple fiber cores, fiber filler paste, fiber optic tube sleeve, and signal sheath. The fiber cores are disposed in the fiber filler paste inside the fiber optic tube sleeve, and the signal sheath covers the outside of the fiber optic tube sleeve.

10. The photovoltaic transmission and distribution cable for smart grids according to claim 1, characterized in that, The thickness of the isolation shielding layer, the inner protective layer, and the outer protective layer increases sequentially.

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