Offshore wind and light co-site power collection circuit wiring system

Abstract

The utility model provides a kind of offshore wind and light same field current collection line wiring system, it is related to wiring equipment technical field, and it includes: photovoltaic array, direct current junction box, box type inverter step-up substation, fan, high voltage bus and step-up station;Box type inverter step-up substation includes mutually connected direct current to alternating current inverter and first step-up unit;Photovoltaic array is accessed direct current junction box by MPPT controller, and direct current junction box is connected with the direct current to alternating current inverter in box type inverter step-up substation, forms photovoltaic line;Fan is connected with the first high voltage switch in second step-up unit, forms fan line, wherein, second step-up unit and first step-up unit structure are same;Photovoltaic line and fan line are respectively converged into high voltage bus by independent circuit breaker, form series connection structure;High voltage bus output end is connected with step-up station, forms offshore wind and light same field current collection line. Promote transmission efficiency and transmission line stability.

Description

Technical Field

[0001] This utility model relates to the field of wiring equipment technology, and in particular to a wiring system for a marine wind and solar power collection line. Background Technology

[0002] Offshore wind and solar co-generation power lines refer to power lines that collect, convert, and transmit two different forms of energy—offshore wind power and solar photovoltaic power—to a target area or power grid through an integrated power system. This system utilizes dedicated submarine cables and transformer equipment to collect wind and solar power and efficiently transmits the energy through optimized power transmission lines.

[0003] The importance of offshore wind and solar co-generation line connection systems is reflected in several aspects: First, it enables the effective integration of wind and solar energy, optimizes resource allocation, and avoids the instability of power output caused by fluctuations in a single energy source. Second, a reasonable connection structure can reduce transmission losses, improve power transmission efficiency, and reduce the operating costs of wind and solar power plants. Finally, the design and layout of the connection structure are crucial to the safety and stability of the system, ensuring continuous and stable operation in harsh offshore environments and guaranteeing the efficient and reliable operation of the power system.

[0004] Existing offshore wind and solar co-generation solutions primarily use low-voltage AC cables to collect the electricity from the photovoltaic arrays, connect it to a step-up transformer inside a nearby wind turbine, and then transmit it through medium-voltage collection lines within the wind farm. However, low-voltage AC cables result in low transmission efficiency, small single-circuit capacity, and short transmission distances; furthermore, wind turbine and transformer failures can affect the photovoltaic power generation units, reducing the system's transmission reliability. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model embodiment is to provide a wiring system for offshore wind and solar co-generation power collection lines, which can solve the problems of existing offshore wind and solar co-generation schemes, which mainly collect the power of photovoltaic arrays through low-voltage AC cables, connect them to the step-up transformer inside the nearby wind turbine, and then transmit them through the medium-voltage power collection lines inside the wind farm. However, low-voltage AC cables result in low transmission efficiency, small single-circuit capacity, and short transmission distance; and the failure of wind turbines and transformers will affect photovoltaic power generation units, reducing the reliability of the system's power transmission.

[0006] In a first aspect of this utility model, a wiring system for offshore wind and solar power collection lines is proposed, comprising: a photovoltaic array 1, a DC combiner box 2, a box-type inverter step-up substation 3, a wind turbine 4, a high-voltage busbar 5, and a step-up substation 6;

[0007] The box-type inverter step-up substation 3 includes a DC-to-AC inverter 301 and a first step-up unit 302 connected to each other. The first step-up unit 302 includes a first high-voltage switch 3021, a step-up transformer 3022, a first circuit breaker 3023, a second high-voltage switch 3024, and a second circuit breaker 3025 connected in sequence.

[0008] The photovoltaic array 1 is connected to the DC combiner box 2 through the MPPT controller 101. The DC combiner box 2 is connected to the DC to AC inverter 301 in the box-type inverter step-up substation 3 to form a photovoltaic line.

[0009] The fan 4 is connected to the first high-voltage switch in the second booster unit 401 to form a fan circuit. The second booster unit 401 has the same structure as the first booster unit.

[0010] The photovoltaic lines and wind turbine lines are connected to the high-voltage bus 5 through independent circuit breakers, forming a series connection structure;

[0011] The high-voltage busbar output is connected to the booster station 6 to form a power collection line for both offshore wind and solar power.

[0012] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0013] In this embodiment of the invention, the structure of a DC combiner box and a box-type inverter step-up substation solves the problems of low transmission efficiency, small capacity, and short transmission distance of traditional low-voltage AC cables. The photovoltaic array is connected to the inverter via a DC combiner box, converting the power into AC and then stepping it up to high voltage via a step-up unit. The photovoltaic lines and wind turbine lines are connected to the high-voltage busbar via independent circuit breakers, forming a series structure that improves transmission efficiency and reliability. This design allows for rapid isolation of faulty units in the event of wind turbine or transformer failures, preventing the fault from affecting the operation of the entire system. Simultaneously, the high-voltage busbar and independent line structure effectively reduce investment in submarine cables and the area of ​​sea area used, optimizes space utilization, avoids the safety hazards associated with traditional floating low-voltage submarine cables, and improves the convenience of later operation and maintenance. Attached Figure Description

[0014] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention. Throughout the drawings, the same reference numerals denote the same components. Obviously, the drawings described below are merely some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0015] Figure 1 This is a schematic diagram of the wiring system for a marine wind and solar power collection line provided in an embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of a step-up transformer provided in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the connection structure between a box-type inverter step-up substation and a photovoltaic array provided in an embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the connection structure between the second booster unit and the fan provided in an embodiment of this utility model.

[0019] Figure label:

[0020] 1. Photovoltaic array; 101. MPPT controller; 2. DC combiner box; 3. Box-type inverter step-up substation; 301. DC to AC inverter; 302. First step-up unit; 3021. First high-voltage switch; 3022. Step-up transformer; 30221. Housing; 30222. Flushing baffle; 30223. Hot air output terminal; 30224. Cold air input terminal; 30225. Air cooling box; 30226. Fan; 30227. Water-cooled heat exchanger; 30228. External heat exchanger; 3023. First circuit breaker; 3024. Second high-voltage switch; 3025. Second circuit breaker; 4. Fan; 401. Second step-up unit; 5. High-voltage busbar; 6. Step-up substation; 7. Grounding box; 8. Data monitoring equipment. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in the embodiments of this utility model, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0022] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts disclosed in this utility model.

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention.

[0024] Figure 1This is a schematic diagram of the wiring system for a marine wind and solar power collection line provided in an embodiment of this utility model.

[0025] Figure 2 This is a schematic diagram of the structure of a step-up transformer provided in an embodiment of this utility model.

[0026] Figure 3 This is a schematic diagram of the connection structure between a box-type inverter step-up substation and a photovoltaic array provided in an embodiment of this utility model.

[0027] Figure 4 This is a schematic diagram of the connection structure between the second booster unit and the fan provided in an embodiment of this utility model.

[0028] This utility model provides a wiring system for offshore wind and solar power collection lines, including: a photovoltaic array 1, a DC combiner box 2, a box-type inverter step-up substation 3, a wind turbine 4, a high-voltage busbar 5, and a step-up substation 6.

[0029] The box-type inverter step-up substation 3 includes a DC-to-AC inverter 301 and a first step-up unit 302 connected to each other. The first step-up unit 302 includes a first high-voltage switch 3021, a step-up transformer 3022, a first circuit breaker 3023, a second high-voltage switch 3024, and a second circuit breaker 3025 connected in sequence.

[0030] The photovoltaic array 1 is connected to the DC combiner box 2 through the MPPT controller 101. The DC combiner box 2 is connected to the DC to AC inverter 301 in the box-type inverter step-up substation 3 to form a photovoltaic line.

[0031] The fan 4 is connected to the first high-voltage switch in the second booster unit 401 to form a fan circuit. The second booster unit 401 has the same structure as the first booster unit.

[0032] The photovoltaic lines and wind turbine lines are connected to the high-voltage bus 5 through independent circuit breakers, forming a series connection structure.

[0033] The high-voltage busbar output is connected to the booster station 6 to form a power collection line for both offshore wind and solar power.

[0034] The system comprises the following components: Photovoltaic array 1 collects solar energy and converts it into direct current (DC). DC combiner box 2 combines the DC power from multiple photovoltaic modules to form a unified DC output. Box-type inverter-boost substation 3 includes a DC-to-AC inverter and a boost unit, converting DC to AC and stepping up the voltage. Wind turbine 4 collects wind energy and converts it into high-voltage AC power via a boost transformer. High-voltage bus 5 collects the output power from photovoltaic and wind power for high-voltage transmission. Booster station 6 further boosts the voltage of the power collection system and transmits it to the power grid or target area.

[0035] The MPPT (Maximum Power Point Tracking Controller) is a device used in photovoltaic (PV) power generation systems. Its main function is to monitor the output voltage and current of the PV array in real time and automatically adjust the operating point of the PV system to ensure it always operates at its maximum power point. By dynamically adjusting the operating voltage and current of the PV array, the MPPT controller can maximize the extraction of electricity generated by the PV panels, thereby improving power generation efficiency. In offshore wind-solar co-current collection systems, the MPPT controller optimizes the output of the PV array, enabling it to maintain optimal power output based on changes in sunlight intensity and other environmental conditions, ensuring the system's efficient operation.

[0036] This structure first concentrates the DC power generated by the photovoltaic array through a DC combiner box, then converts it to AC power via an inverter in a box-type inverter step-up substation, and finally boosts it to high voltage through a step-up unit. Wind power is also converted to high-voltage AC power through the step-up unit. The outputs of the photovoltaic and wind turbines are connected to the high-voltage busbar through independent circuit breakers, forming a series connection. This ensures that the system can quickly isolate the fault area in the event of a wind turbine or transformer failure, preventing disruption to the overall system operation. This structure improves transmission efficiency, optimizes space utilization, reduces investment in submarine cables, avoids the safety hazards associated with floating low-voltage cables, and enhances the convenience of later operation and maintenance.

[0037] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0038] In this embodiment of the invention, the structure of a DC combiner box and a box-type inverter step-up substation solves the problems of low transmission efficiency, small capacity, and short transmission distance of traditional low-voltage AC cables. The photovoltaic array is connected to the inverter via a DC combiner box, converting the power into AC and then stepping it up to high voltage via a step-up unit. The photovoltaic lines and wind turbine lines are connected to the high-voltage busbar via independent circuit breakers, forming a series structure that improves transmission efficiency and reliability. This design allows for rapid isolation of faulty units in the event of wind turbine or transformer failures, preventing the fault from affecting the operation of the entire system. Simultaneously, the high-voltage busbar and independent line structure effectively reduce investment in submarine cables and the area of ​​sea area used, optimizes space utilization, avoids the safety hazards associated with traditional floating low-voltage submarine cables, and improves the convenience of later operation and maintenance.

[0039] In one possible implementation, the step-up transformer 3022 is located inside the housing 30221.

[0040] A baffle plate 30222 is provided inside the outer casing 30221 to form an air circulation loop inside the outer casing.

[0041] The baffle plate 30222 has a hot air outlet 30223 and a cold air inlet 30224 on both sides.

[0042] Both the hot air outlet 30223 and the cold air inlet 30224 are connected to the air cooling box 30225 on one side of the outer casing 30221.

[0043] The air cooling box 30225 is equipped with a fan 30226 and a water-cooled heat exchanger 30227. The fan 30226 is positioned opposite to the hot air output end 30223, and the water-cooled heat exchanger output end 30227 is connected to the cold air input end 30224.

[0044] The water-cooled heat exchanger 30227 is connected to the external heat exchanger 30228 to form a water circulation loop.

[0045] The step-up transformer 3022 is used to increase the voltage from low to high for long-distance transmission. The housing 30221 surrounds the transformer, protecting it from external environmental influences and providing a closed space for the cooling system. A baffle 30222, located inside the housing, guides airflow, forming an air circulation loop to improve cooling efficiency. Hot air outlet 30223 and cold air inlet 30224 are used to exhaust hot air and introduce cold air, respectively, maintaining temperature balance within the equipment. The air cooling box 30225 cools the air and is equipped with a fan and a water-cooled heat exchanger. The fan 30226 helps accelerate the exhaust of hot air, enhancing the cooling effect. The water-cooled heat exchanger 30227, connected to an external heat exchanger, uses a water circulation system to cool the air. The external heat exchanger 30228 forms a water circulation loop, carrying away heat and further cooling the water-cooled heat exchanger.

[0046] It should be noted that this cooling structure forms a closed airflow loop through the outer shell and baffles. Hot air is discharged through the hot air outlet, while cold air enters through the cold air inlet and is cooled by a fan and a water-cooled heat exchanger. The water-cooled heat exchanger is connected to an external heat exchanger, utilizing water circulation to remove heat, thereby achieving effective temperature regulation. This design combines air and water cooling methods, improving cooling efficiency, ensuring stable operation of the step-up transformer under high loads, and extending the equipment's service life.

[0047] In one possible implementation, the housing 30221 of the step-up transformer 3022 is specifically an IP54 housing.

[0048] The IP54 enclosure is a standard enclosure with dust and water resistance. An IP54 enclosure effectively prevents dust and moisture from entering, thus ensuring the stable operation of the step-up transformer in harsh environments, extending equipment lifespan, and reducing the risk of failure.

[0049] In one possible implementation, the step-up transformer 3022 is specifically a dry-type step-up transformer.

[0050] Dry-type step-up transformers are transformers that do not use oil or liquids as cooling media; they are typically cooled by air or other solid media. Dry-type transformers isolate the circuitry from the air using insulating materials, thus avoiding the leakage risks associated with oil-cooled transformers, making them suitable for environments with high environmental requirements. Dry-type step-up transformers offer higher safety and environmental friendliness because they do not use flammable oil coolants, reducing the risk of fire and environmental pollution, making them particularly suitable for applications with stringent environmental requirements, such as offshore applications.

[0051] In one possible implementation, the wiring between the photovoltaic array 1 and the DC-to-AC inverter 301 is laid using salt spray resistant DC cables, wherein the salt spray resistant DC cables are cross-linked polyolefin insulated low-voltage DC cables for marine engineering. The remaining wiring of the offshore wind and solar power collection line is laid using cross-linked polyethylene submarine cables.

[0052] Among them, salt spray resistant DC cables are specifically designed to resist salt spray corrosion in marine environments. Their main characteristics are strong corrosion resistance, enabling long-term stable operation in the humid, high-salt environments of the ocean. Cross-linked polyolefin (XLPE) insulated low-voltage DC cables for marine engineering are a specific type of salt spray resistant cable. Using XLPE as insulation material, this material has good chemical inertness and high corrosion resistance, effectively resisting seawater corrosion. Additionally, XLPE submarine cables are high-strength cables commonly used for offshore power transmission. XLPE has excellent electrical properties and mechanical strength, meeting the needs of offshore wind and solar power simultaneous current collection systems, especially in harsh marine environments, where it exhibits better corrosion resistance and a longer service life.

[0053] The DC line between the photovoltaic array and the inverter uses salt spray resistant DC cables to prevent corrosion from salt spray in the marine environment and ensure the reliability of power transmission. Other power transmission lines use cross-linked polyethylene submarine cables, which have better corrosion resistance and mechanical strength, are suitable for the marine environment, and ensure the long-term stable operation of the system.

[0054] In one possible implementation, the outer layer of the cross-linked polyethylene submarine cable is further covered with a copper wire braided layer and a polyurethane protective sleeve in sequence.

[0055] It should be noted that the outer layer of the cross-linked polyethylene submarine cable is covered with a copper wire braided layer and a polyurethane protective sheath. The copper wire braided layer enhances the cable's tensile strength and electromagnetic interference resistance, while the polyurethane protective sheath provides additional mechanical protection against seawater, ultraviolet rays, and external physical damage, effectively extending the cable's service life and ensuring its reliability and durability in marine environments.

[0056] In one possible implementation, it also includes: a grounding box 7.

[0057] Both the circuit breaker's active terminal and the step-up transformer are equipped with a grounding terminal 701.

[0058] Each cross-linked polyethylene submarine cable is connected to a grounding box 7 at both ends.

[0059] Each grounding terminal is grounded through grounding box 7.

[0060] Understandably, by setting grounding terminals at the active end of the circuit breaker and the step-up transformer, and connecting both ends of each cross-linked polyethylene submarine cable to a grounding box, the electrical safety of the entire system is ensured. The grounding box connects each grounding terminal to the ground, forming an effective grounding loop. This prevents electrical accidents caused by electrical faults or lightning strikes, helps improve the safety and stability of the system, and protects the equipment from electrical damage.

[0061] In one possible implementation, it also includes: a data monitoring device 8.

[0062] Data monitoring equipment 8 is installed at booster station 6.

[0063] The data monitoring equipment is located at the booster station and is used to monitor and collect system operating data in real time, such as important parameters like voltage, current, and temperature. By monitoring this data, potential faults or anomalies can be detected in a timely manner, facilitating preventative inspections and troubleshooting by maintenance personnel, thereby improving the system's operational safety and efficiency, and ensuring the stable operation of the offshore wind and solar power collection system.

[0064] Specifically, this structure effectively integrates wind and solar power generation through components such as photovoltaic arrays, DC combiner boxes, box-type inverter step-up substations, wind turbines, and high-voltage busbars. The photovoltaic array converts solar energy into direct current (DC), which is then collected by the DC combiner box and converted into alternating current (AC) by an inverter. The step-up unit boosts this voltage to high voltage, and wind power is converted into high-voltage AC by a step-up transformer. Both are connected to the high-voltage busbar via independent circuit breakers, ensuring rapid isolation of the affected area in case of a fault, preventing disruption to the entire system. The structure utilizes salt-spray resistant DC cables and cross-linked polyethylene (XLPE) submarine cables to ensure excellent corrosion resistance and mechanical strength of the power transmission lines in marine environments, extending the system's lifespan. The step-up transformer employs a dry-type design to avoid environmental pollution from oil leaks, meeting the stringent requirements of marine environments. The system is also equipped with a grounding box to ensure electrical safety and uses data monitoring equipment to collect operational data in real time, improving system safety and operational efficiency. The overall structure optimizes space utilization, reduces submarine cable investment, and simultaneously improves transmission efficiency and system reliability.

[0065] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the preferred embodiments; however, those skilled in the art can fully understand this utility model without these details. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, and not to limit it. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wiring system for simultaneous wind and solar power collection lines at sea, characterized in that, include: Photovoltaic arrays, DC combiner boxes, box-type inverter step-up substations, wind turbines, high-voltage busbars and step-up substations; The box-type inverter step-up substation includes interconnected DC-to-AC inverters and a first step-up unit, wherein the first step-up unit includes a first high-voltage switch, a step-up transformer, a first circuit breaker, a second high-voltage switch, and a second circuit breaker connected in sequence. The photovoltaic array is connected to the DC combiner box via an MPPT controller. The DC combiner box is connected to the DC-to-AC inverter in the box-type inverter step-up substation to form a photovoltaic line. The fan is connected to the first high-voltage switch in the second booster unit to form a fan circuit, wherein the second booster unit has the same structure as the first booster unit; The photovoltaic line and the wind turbine line are respectively connected to the high-voltage bus through independent circuit breakers to form a series connection structure; The high-voltage bus output is connected to the booster station to form the offshore wind and solar power collection line.

2. The offshore wind and solar power simultaneous collection line wiring system according to claim 1, characterized in that, The step-up transformer is located inside the outer casing; A baffle plate is provided inside the outer casing to form an air circulation loop inside the outer casing; The flow guide baffle is provided with a hot air output end and a cold air input end on both sides respectively; Both the hot air output end and the cold air input end are connected to the air cooling box on one side of the outer casing. The air cooling box is equipped with a fan and a water-cooled heat exchanger. The fan is positioned opposite to the hot air output end, and the output end of the water-cooled heat exchanger is connected to the cold air input end. The water-cooled heat exchanger is connected to the external heat exchanger to form a water circulation loop.

3. The offshore wind and solar power simultaneous collection line wiring system according to claim 2, characterized in that, The outer casing of the step-up transformer is specifically an IP54-rated outer casing.

4. The offshore wind and solar power simultaneous collection line wiring system according to claim 2, characterized in that, The step-up transformer is specifically a dry-type step-up transformer.

5. The offshore wind and solar power simultaneous current collection line wiring system according to claim 1, characterized in that, The line between the photovoltaic array and the DC-to-AC inverter is laid with a salt spray resistant DC cable, wherein the salt spray resistant DC cable is a cross-linked polyolefin insulated low-voltage DC cable for marine engineering; the remaining line of the offshore wind and solar co-current power collection line is laid with a cross-linked polyethylene submarine cable.

6. The offshore wind and solar power simultaneous collection line wiring system according to claim 5, characterized in that, The outer layer of the cross-linked polyethylene submarine cable is further covered with a copper wire braided layer and a polyurethane protective sleeve.

7. The offshore wind and solar power simultaneous current collection line wiring system according to claim 5, characterized in that, Also includes: Grounding box; Both the active terminal of the circuit breaker and the step-up transformer are equipped with grounding terminals; Each of the cross-linked polyethylene submarine cables is connected to a grounding box at both ends; Each of the aforementioned grounding terminals is grounded through the aforementioned grounding box.

8. The offshore wind and solar power simultaneous current collection line wiring system according to claim 1, characterized in that, Also includes: Data monitoring equipment; The data monitoring equipment is located at the booster station.

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