A new type of offshore wind power collection line

Abstract

The utility model discloses a novel offshore wind power collection line, include: wind turbine unit, and the wind turbine unit of multiple constitutes cluster, 66kV AC sea cable section, 66kV AC sea cable section series connection preceding section's wind turbine unit, 110kV AC sea cable section, 110kV AC sea cable section series connection rear section's wind turbine unit to be connected to offshore booster station or converter station, voltage conversion module, voltage conversion module input end connection 66kV AC sea cable section, and its output end connection 110kV AC sea cable section. The utility model adopts two or more voltage grade sea cable series connection wind turbine unit, makes full use of 66kV small section sea cable advantage, avoids the drawback of the re development 110kV small section sea cable, both reduces 110kV small section sea cable's waste, also reduced the whole wind farm sea cable length and sea cable loss.

Description

Technical Field

[0001] This utility model relates to a novel offshore wind power collection line, belonging to the field of wind power generation technology. Background Technology

[0002] In recent years, the development of nearshore wind power resources has gradually reached saturation, and deep-sea areas are becoming a new frontier for offshore wind power development. Deep-sea wind power development can significantly increase the scale of wind power development and reduce energy utilization costs in coastal areas. However, the deep-sea environment is more complex than that of nearshore areas, and engineering costs and difficulties increase with water depth, posing greater challenges to the construction costs and life-cycle operation of wind farms.

[0003] Due to the limited current carrying capacity of submarine cables, and with the development of ultra-large capacity offshore wind turbines, the number of wind turbines connected to each collector line is decreasing, while the number of collector lines in wind farms is increasing. This leads to increased costs, installation difficulties, more complex processes, and greater operational and maintenance challenges in wind farm construction. Recently, wind turbine manufacturers have announced newly developed offshore wind turbines with single-unit capacities of 20-26MW. If a 20MW wind turbine is selected, a single 66kV collector line circuit can only connect four turbines. A 2000MW offshore wind farm would require 25 collector lines. The large number and length of submarine cables also result in significant cable losses.

[0004] Therefore, there is an urgent need to propose a new type of offshore wind power collection line to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a new type of offshore wind power collection line, which uses two or more voltage level submarine cables to connect wind turbine units in series. This reduces the waste of 110kV small cross-section submarine cables, reduces the overall length of submarine cables and cable losses in the wind farm, and lowers the construction cost and difficulty of the entire wind farm.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a novel offshore wind power collection line, comprising:

[0007] Wind turbine units, multiple wind turbine units forming a cluster;

[0008] A 66kV AC submarine cable section, which is connected in series with the wind turbine unit in the upstream section;

[0009] A 110kV AC submarine cable section, which is connected in series with the wind turbine unit in the downstream section and connected to the offshore booster station or converter station.

[0010] A voltage conversion module, the input end of which is connected to the 66kV AC submarine cable section, and the output end of which is connected to the 110kV AC submarine cable section, the voltage conversion module dynamically matches the capacity of the wind turbine units in the upstream and downstream sections to realize voltage conversion and power transmission from 66kV to 110kV;

[0011] The wind farm can be designed with multiple collection lines, which are connected to the offshore booster station or offshore converter station via 110kV AC submarine cables.

[0012] The aforementioned novel offshore wind power collection line includes a voltage conversion module comprising a three-winding transformer. The high-voltage side 110kV winding of the three-winding transformer is connected to a 110kV AC submarine cable section, the medium-voltage side 66kV winding of the three-winding transformer is connected to a 66kV AC submarine cable section, and the low-voltage side 1.14kV winding of the three-winding transformer is connected to a wind turbine.

[0013] The 110kV high-voltage winding capacity of the three-winding transformer is the sum of the capacities of the current wind turbine and all wind turbines in the preceding section; the 66kV medium-voltage winding capacity of the three-winding transformer is the sum of the capacities of the preceding wind turbines; and the 1.14kV low-voltage winding capacity of the three-winding transformer is the transformer capacity required by the wind turbine connected at that location.

[0014] The aforementioned novel offshore wind power collection line, wherein the voltage conversion module further includes:

[0015] The first 72.5kV GIS switchgear is connected to the 66kV winding of the three-winding transformer and the 66kV AC submarine cable section, protecting the 66kV AC submarine cable and the three-winding transformer.

[0016] The first 121kV GIS switchgear connects the 110kV winding of the three-winding transformer and the 110kV AC submarine cable section, protecting the 110kV AC submarine cable and the three-winding transformer.

[0017] The aforementioned novel offshore wind power collection line includes a voltage conversion module comprising a first transformer and a second transformer. The 66kV side of the first transformer is connected to a 66kV AC submarine cable section and the 66kV low-voltage side of the second transformer, respectively. The 1.14kV low-voltage side of the first transformer is connected to a wind turbine generator, and the 110kV high-voltage side of the second transformer is connected to a 110kV AC submarine cable section.

[0018] The 66kV side capacity of the first transformer is the sum of the capacities of the wind turbine units mentioned earlier, and the 110kV side capacity of the second transformer is the sum of the capacities of the current wind turbine unit and all the wind turbine units mentioned earlier.

[0019] The aforementioned novel offshore wind power collection line, wherein the voltage conversion module further includes:

[0020] The second 72.5kV GIS switchgear connects the high-voltage side of the first transformer and the 66kV AC submarine cable section, protecting the 66kV AC submarine cable and the first transformer.

[0021] The second 121kV GIS switchgear connects the high-voltage side of the second transformer and the 110kV AC submarine cable section, protecting the 110kV AC submarine cable and the second transformer.

[0022] In the aforementioned novel offshore wind power collection line, the conductor cross-section of the 66kV AC submarine cable section increases progressively from the first wind turbine unit to the voltage conversion module, and the conductor cross-section of the 110kV AC submarine cable section increases progressively from the voltage conversion module to the offshore booster station or converter station.

[0023] The aforementioned novel offshore wind power collection line integrates the voltage conversion module into the wind turbine tower platform, which includes a nacelle, an inner tower platform, or an outer tower platform.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] (1) This utility model adopts 66kV and 110kV submarine cables in series to wind turbine units, making full use of the advantages of 66kV small cross-section submarine cables and avoiding the disadvantages of redeveloping 110kV small cross-section submarine cables. This reduces the waste of 110kV small cross-section submarine cables and also reduces the length of submarine cables and cable losses in the entire wind farm.

[0026] (2) Each collection line of this utility model connects to more offshore wind turbines, which greatly reduces the number of collection lines in the offshore wind farm and reduces the total length of the submarine cable.

[0027] (3) This utility model greatly reduces submarine cable loss and shortens the construction period.

[0028] (4) This utility model solves the technical problem of energy transmission in wind farms of ultra-large offshore wind turbine units. Attached Figure Description

[0029] Figure 1 This is a utility model diagram of an offshore wind power collection line;

[0030] Figure 2 This is a schematic diagram of the power collection line conversion device in Embodiment 2 of this utility model;

[0031] Figure 3This is a schematic diagram of the power collection line conversion device in Embodiment 2 of this utility model;

[0032] Figure 4 This is a schematic diagram of multiple novel offshore wind power collection lines according to this utility model.

[0033] Attached reference numerals: 1-Wind turbine, 2-66kV AC submarine cable section, 3-Voltage conversion module, 4-110kV AC submarine cable section, 5-Offshore booster station or converter station, 31-Three-winding transformer, 32-First 72.5kV GIS switchgear, 33-First 121kV GIS switchgear, 31'-First transformer, 32'-Second 72.5kV GIS switchgear, 33'-Second transformer, 34'-Second 121kV GIS switchgear.

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0035] Embodiment 1 of this utility model: A novel offshore wind power collection line, such as Figure 1 The following are included:

[0036] Wind turbine 1, multiple wind turbines 1 forming a cluster; 66kV AC submarine cable section 2, the 66kV AC submarine cable section 2 being connected in series to the upstream wind turbine 1; 110kV AC submarine cable section 4, the 110kV AC submarine cable section 4 being connected in series to the downstream wind turbine 1, and connected to an offshore booster station or converter station 5; voltage conversion module 3, the input end of the voltage conversion module 3 being connected to the 66kV AC submarine cable section 2, and its output end being connected to the 110kV AC submarine cable section 4, the voltage conversion module 3 dynamically matching the capacity of the upstream and downstream wind turbines 1 to achieve voltage conversion and power transmission from 66kV to 110kV. Using two (or more) voltage levels, 66kV and 110kV, the submarine cable is connected in series with the wind turbine unit 1. This fully utilizes the advantages of the 66kV small cross-section submarine cable and avoids the drawbacks of redeveloping the 110kV small cross-section submarine cable. This reduces the waste of the 110kV small cross-section submarine cable and also reduces the overall length and loss of the submarine cable in the wind farm.

[0037] Embodiment 2 of this utility model: A novel offshore wind power collection line, comprising:

[0038] Wind turbine 1, multiple wind turbines 1 forming a cluster; 66kV AC submarine cable section 2, the 66kV AC submarine cable section 2 being connected in series to the upstream wind turbine 1; 110kV AC submarine cable section 4, the 110kV AC submarine cable section 4 being connected in series to the downstream wind turbine 1, and connected to an offshore booster station or converter station 5; voltage conversion module 3, the input end of the voltage conversion module 3 being connected to the 66kV AC submarine cable section 2, and its output end being connected to the 110kV AC submarine cable section 4, the voltage conversion module 3 dynamically matching the capacity of the upstream and downstream wind turbines 1 to achieve voltage conversion and power transmission from 66kV to 110kV. Using two (or more) voltage levels, 66kV and 110kV, the submarine cable is connected in series with the wind turbine unit 1. This fully utilizes the advantages of the 66kV small cross-section submarine cable and avoids the drawbacks of redeveloping the 110kV small cross-section submarine cable. This reduces the waste of the 110kV small cross-section submarine cable and also reduces the overall length and loss of the submarine cable in the wind farm.

[0039] like Figure 2 As shown, the voltage conversion module 3 includes a three-winding transformer 31. The high-voltage side 110kV winding of the three-winding transformer 31 is connected to the 110kV AC submarine cable section 4, and the medium-voltage side 66kV winding of the three-winding transformer 31 is connected to the 66kV AC submarine cable section 2. The low-voltage side 1.14kV winding of the three-winding transformer 31 is connected to a wind turbine 1. The capacity of the high-voltage side 110kV winding of the three-winding transformer 31 is the sum of the capacities of the current wind turbine 1 and all the preceding wind turbine 1s. The capacity of the medium-voltage side 66kV winding of the three-winding transformer 31 is the sum of the capacities of the preceding wind turbines. The capacity of the low-voltage side 1.14kV winding of the three-winding transformer 31 is the transformer capacity required by the wind turbine 1 connected at this location.

[0040] The voltage conversion module 3 also includes:

[0041] The first 72.5kV GIS switchgear 32 is connected to the 66kV winding of the three-winding transformer 31 and the 66kV AC submarine cable section 2, and protects the 66kV AC submarine cable 2 and the three-winding transformer 31.

[0042] The first 121kV GIS switchgear 33 is connected to the 110kV winding of the three-winding transformer 31 and the 110kV AC submarine cable section 4, protecting the 110kV AC submarine cable 4 and the three-winding transformer 31.

[0043] Specifically, the conductor cross-section of the 66kV AC submarine cable section 2 increases progressively from the first wind turbine 1 to the voltage conversion module 3, and the conductor cross-section of the 110kV AC submarine cable section 4 increases progressively from the voltage conversion module 3 to the offshore booster station or converter station 5.

[0044] Specifically, the voltage conversion module 3 is integrated into the wind turbine tower platform, which includes the nacelle, the inner tower platform, or the outer tower platform.

[0045] Embodiment 3 of this utility model: A novel offshore wind power collection line, comprising:

[0046] Wind turbine 1, multiple wind turbines 1 forming a cluster; 66kV AC submarine cable section 2, the 66kV AC submarine cable section 2 being connected in series to the upstream wind turbine 1; 110kV AC submarine cable section 4, the 110kV AC submarine cable section 4 being connected in series to the downstream wind turbine 1, and connected to an offshore booster station or converter station 5; voltage conversion module 3, the input end of the voltage conversion module 3 being connected to the 66kV AC submarine cable section 2, and its output end being connected to the 110kV AC submarine cable section 4, the voltage conversion module 3 dynamically matching the capacity of the upstream and downstream wind turbines 1 to achieve voltage conversion and power transmission from 66kV to 110kV. Using two (or more) voltage levels, 66kV and 110kV, the submarine cable is connected in series with the wind turbine unit 1. This fully utilizes the advantages of the 66kV small cross-section submarine cable and avoids the drawbacks of redeveloping the 110kV small cross-section submarine cable. This reduces the waste of the 110kV small cross-section submarine cable and also reduces the overall length and loss of the submarine cable in the wind farm.

[0047] like Figure 3 As shown, the voltage conversion module 3 includes a first transformer 31' and a second transformer 33'. The 66kV side of the first transformer 31' is connected to the 66kV AC submarine cable section 2 and the 66kV low-voltage side of the second transformer 33'. The 1.14kV low-voltage side of the first transformer 31' is connected to the wind turbine 1, and the 110kV high-voltage side of the second transformer 33' is connected to the 110kV AC submarine cable section 4.

[0048] The 66kV side capacity of the first transformer 31' is the sum of the capacities of the wind turbine 1 mentioned earlier, and the 110kV side capacity of the second transformer 33' is the sum of the capacities of the current wind turbine 1 and all the wind turbine 1 mentioned earlier.

[0049] Voltage conversion module 3 also includes:

[0050] The second 72.5kV GIS switchgear 32' is connected to the high-voltage side of the first transformer 31' and the 66kV AC submarine cable section 2, protecting the 66kV AC submarine cable 2 and the first transformer 31'.

[0051] The second 121kV GIS switchgear 34' connects the high-voltage side of the second transformer 33' and the 110kV AC submarine cable section 4, protecting the 110kV AC submarine cable 4 and the second transformer 33'.

[0052] Specifically, the conductor cross-section of the 66kV AC submarine cable section 2 increases progressively from the first wind turbine 1 to the voltage conversion module 3, and the conductor cross-section of the 110kV AC submarine cable section 4 increases progressively from the voltage conversion module 3 to the offshore booster station or converter station 5.

[0053] Specifically, the voltage conversion module 3 is integrated into the wind turbine tower platform, which includes the nacelle, the inner tower platform, or the outer tower platform.

[0054] Embodiment 4 of this utility model: A novel offshore wind power collection line, comprising:

[0055] Wind turbine 1, multiple wind turbines 1 forming a cluster; 66kV AC submarine cable section 2, the 66kV AC submarine cable section 2 being connected in series to the upstream wind turbine 1; 110kV AC submarine cable section 4, the 110kV AC submarine cable section 4 being connected in series to the downstream wind turbine 1, and connected to an offshore booster station or converter station 5; voltage conversion module 3, the input end of the voltage conversion module 3 being connected to the 66kV AC submarine cable section 2, and its output end being connected to the 110kV AC submarine cable section 4, the voltage conversion module 3 dynamically matching the capacity of the upstream and downstream wind turbines 1 to achieve voltage conversion and power transmission from 66kV to 110kV. Using two (or more) voltage levels, 66kV and 110kV, the submarine cable is connected in series with the wind turbine unit 1. This fully utilizes the advantages of the 66kV small-section submarine cable and avoids the drawbacks of redeveloping the 110kV small-section submarine cable. This reduces the waste of the 110kV small-section submarine cable and also reduces the overall length and loss of the submarine cable in the wind farm. Figure 4 As shown, the wind farm can be designed with multiple collection lines, which are connected to the offshore booster station or offshore converter station 5 by 110kV AC submarine cable 4 respectively.

[0056] The working principle of one embodiment of this utility model is as follows: This utility model connects multiple offshore wind turbine units 1 sequentially via a 66kV AC submarine cable 2. After passing through a collector line conversion device 3, it connects to a 110kV AC submarine cable 4. Then, the 110kV AC submarine cable 4 is used to connect multiple offshore wind turbine units 1 sequentially to form a collector line. The wind farm is designed with multiple such collector lines, each connected to an offshore booster station or offshore converter station 5 via a 110kV AC submarine cable 4. By using submarine cables of two (or more) voltage levels, 66kV and 110kV, in series with the wind turbine units 1, the advantages of the 66kV small-section submarine cable are fully utilized, avoiding the disadvantages of redeveloping a 110kV small-section submarine cable. This reduces the waste of the 110kV small-section submarine cable and also reduces the overall cable length and cable loss of the wind farm.

Claims

1. A novel offshore wind power collection line, characterized in that, include: Wind turbine (1), multiple wind turbines (1) constitute a cluster; 66kV AC submarine cable segment (2), wherein the 66kV AC submarine cable segment (2) is connected in series to the wind turbine unit (1) in the front section; 110kV AC submarine cable segment (4), the 110kV AC submarine cable segment (4) is connected in series to the wind turbine unit (1) of the downstream section, and connected to the offshore booster station or converter station (5); The voltage conversion module (3) has its input end connected to the 66kV AC submarine cable section (2) and its output end connected to the 110kV AC submarine cable section (4). The voltage conversion module (3) dynamically matches the capacity of the wind turbine units (1) in the front and rear sections to realize voltage conversion and power transmission from 66kV to 110kV.

2. The novel offshore wind power collection line according to claim 1, characterized in that, The voltage conversion module (3) includes a three-winding transformer (31). The high-voltage side 110kV winding of the three-winding transformer (31) is connected to a 110kV AC submarine cable section (4). The medium-voltage side 66kV winding of the three-winding transformer (31) is connected to a 66kV AC submarine cable section (2). The low-voltage side 1.14kV winding of the three-winding transformer (31) is connected to a wind turbine (1). The 110kV high-voltage winding capacity of the three-winding transformer (31) is the sum of the capacities of the current wind turbine (1) and all the wind turbines (1) in the preceding section; the 66kV medium-voltage winding capacity of the three-winding transformer (31) is the sum of the capacities of the wind turbines in the preceding section; the 1.14kV low-voltage winding capacity of the three-winding transformer (31) is the transformer capacity required by the wind turbine (1) connected at this location.

3. A novel offshore wind power collection line according to claim 2, characterized in that, The voltage conversion module (3) also includes: The first 72.5kV GIS switchgear (32) is connected to the 66kV winding of the three-winding transformer (31) and the 66kV AC submarine cable section (2). The first 121kV GIS switchgear (33) is connected to the 110kV winding of the three-winding transformer (31) and the 110kV AC submarine cable section (4).

4. A novel offshore wind power collection line according to claim 1, characterized in that, The voltage conversion module (3) includes a first transformer (31') and a second transformer (33'). The 66kV side of the first transformer (31') is connected to the 66kV AC submarine cable section (2) and the 66kV low-voltage side of the second transformer (33'). The 1.14kV low-voltage side of the first transformer (31') is connected to a wind turbine (1), and the 110kV high-voltage side of the second transformer (33') is connected to the 110kV AC submarine cable section (4). The 66kV side capacity of the first transformer (31') is the sum of the capacities of the wind turbine units (1) mentioned earlier, and the 110kV side capacity of the second transformer (33') is the sum of the capacities of the current wind turbine unit (1) and all the wind turbine units (1) mentioned earlier.

5. A novel offshore wind power collection line according to claim 4, characterized in that, The voltage conversion module (3) also includes: The second 72.5kV GIS switchgear (32') is connected to the high-voltage side of the first transformer (31') and the 66kV AC submarine cable section (2); The second 121kV GIS switchgear (34') is connected to the high-voltage side of the second transformer (33') and the 110kV AC submarine cable section (4).

6. A novel offshore wind power collection line according to any one of claims 1-5, characterized in that, The conductor cross-section of the 66kV AC submarine cable section (2) increases progressively from the first wind turbine (1) to the voltage conversion module (3), and the conductor cross-section of the 110kV AC submarine cable section (4) increases progressively from the voltage conversion module (3) to the offshore booster station or converter station (5).

7. A novel offshore wind power collection line according to any one of claims 1-5, characterized in that, The voltage conversion module (3) is integrated into the wind turbine tower platform, which includes the nacelle, the inner tower platform, or the outer tower platform.

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