Isolated network type wind power supply and distribution system for deep and far sea

Abstract

The invention relates to an isolated grid type wind power supply and distribution system for deep and far seas. The system comprises a plurality of segmented busbars, a confluence busbar and a plurality of electric devices. Each segmented busbar is electrically connected with a plurality of current collection loops, and a plurality of wind power generation devices are connected in series on each current collection loop; the confluence busbar is respectively connected with the plurality of segmented busbars, and quick-break current limiters are arranged between the confluence busbar and the segmented busbars; and each electric device is at least connected with one segmented busbar. Compared with the prior art, the bus-bars are adopted, so that no matter which segmented bus-bar and the quick-break current limiter between the bus-bars act, the other segmented bus-bars can still be connected together, the stability of the system is enhanced, and therefore, under the normal working condition, the plurality of segmented bus-bars of the isolated grid type wind power supply and distribution system are connected into the same bus-bar in a normally closed manner; and in case of short circuit, the quick-break current limiter can quickly separate the plurality of segmented busbars, so that the quick-break current limiter is safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to an isolated grid wind power supply and distribution system for deep sea. Background Art

[0002] At present, my country's offshore wind power projects are mainly located in offshore waters. As offshore space resources become increasingly scarce, it is an inevitable trend for offshore wind power to move to deep seas. However, there are still many challenges in deep sea wind power technology. Since deep sea wind farms are far from the shore, power transmission is one of the limiting factors in its development. Therefore, it is of great significance to utilize wind energy nearby and study isolated offshore wind power systems, such as isolated offshore wind power production of hydrogen or methanol.

[0003] Since the equipment has certain requirements for power supply stability, all wind power in the offshore wind turbine group is collected into the same distribution network to improve power supply stability, and the larger the wind farm, the better the relative stability. However, when the power of the grid is very large, due to the limitations of the rated current and short-circuit current bearing capacity of the protection device, the traditional power supply and distribution method will make the system voltage level very high, which may reach 66kV and above. However, when the voltage level reaches above 66kV, gas insulated switchgear (GAS insulated SWITCHGEAR, referred to as GIS) is generally required, and the use of GIS insulation cabinets on floating platforms is not yet very mature. It is necessary to reduce the voltage level of large-capacity power supply and distribution systems and develop wind power supply and distribution systems with safe electricity use. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide an isolated wind power supply and distribution system for deep sea, reduce the voltage level of the power supply and distribution system, and improve the safety of electricity use.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An isolated grid wind power supply and distribution system for deep sea, comprising:

[0007] A plurality of segmented busbars, each of which is electrically connected to a plurality of collector circuits, each of which is connected in series with a plurality of wind power generation equipment;

[0008] A busbar, wherein the busbar is connected to the plurality of segmented busbars respectively, and a quick-break current limiter is provided between the busbar and the segmented busbars;

[0009] A plurality of electrical devices, each of which is connected to at least one of the segmented busbars.

[0010] In one of the embodiments, a bus tie protection switch is provided between the quick-break current limiter and the segmented busbar.

[0011] In one embodiment, the collector circuit is a submarine cable, and a cable converter is provided between the wind power generation equipment and the segmented busbar.

[0012] In one of the embodiments, the voltage level of the segmented busbar, the busbar, and the quick-break current limiter is the same as the voltage level of the wind power generation equipment.

[0013] In one of the embodiments, the wind power supply and distribution system further includes an air-insulated cabinet, and the segmented busbar and the busbar are both installed in the air-insulated cabinet.

[0014] In one of the embodiments, the voltage level of the electrical equipment is lower than the voltage level of the wind power generation equipment, and a transformer is provided between the segmented busbar and the electrical equipment.

[0015] In one of the embodiments, the voltage level of the wind power generation equipment is 35kV.

[0016] In one of the embodiments, each of the segmented busbars is connected to at most four collector circuits.

[0017] In one of the embodiments, each of the power collection circuits is connected to at most three wind power generation devices.

[0018] In one embodiment, the electrical equipment includes hydrogen production equipment.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The above-mentioned wind power supply and distribution system realizes the isolated grid power supply and distribution system of wind power generation equipment through segmented busbars and busbars, that is, wind power generation equipment does not need to be connected to the land power grid, and can directly supply power to offshore power equipment; when a short-circuit fault occurs, the circuit can be protected by a quick-break current limiter, which is activated at the initial stage of the short-circuit current rise, and disconnects the segmented busbar and the busbar before the instantaneous value of the current reaches the bearing limit. Compared with the traditional single busbar segmentation, due to the use of a busbar, no matter which segmented busbar and busbar The quick-break current limiter is activated, the remaining segmented busbars can still be connected together, thereby enhancing the stability of the system. Therefore, under normal working conditions, multiple segmented busbars of the wind power supply and distribution system are normally closed and connected to the same busbar, and the power supply is relatively stable. In the event of a short circuit, the quick-break current limiter can quickly separate the multiple segmented busbars, which is safe and reliable.

[0021] 2. The above-mentioned wind power supply and distribution system is provided with a bus tie protection switch between the quick-break current limiter and the segmented busbar. When a short circuit fault occurs, if the short circuit current is small, it is protected by the bus tie protection switch; if the short circuit current exceeds the range, it is protected by the quick-break current limiter, thereby improving the safety of the wind power supply and distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the wind power supply and distribution system in the present invention.

[0023] Figure 2 It is a schematic diagram of the connection structure between the segmented busbar and the busbar in the present invention.

[0024] Figure numerals: 100, wind power supply and distribution system; 10, segmented busbar; 11, quick-break current limiter; 12, bus tie protection switch; 20, busbar; 30, collector circuit; 31, cable converter; 32, circuit switch; 40, wind power generation equipment; 50, electrical equipment; 51, transformer; 60, air insulation cabinet. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0026] The isolated grid wind power supply and distribution system 100 for deep sea in some embodiments is described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2 As shown, in one embodiment, an isolated grid wind power supply and distribution system 100 for deep sea is provided, comprising a plurality of segmented busbars 10, a busbar 20 and a plurality of electrical equipment 50;

[0028] Among them, each segmented busbar 10 is electrically connected to multiple collector circuits 30, and multiple wind power generation equipment 40 are connected in series on each collector circuit 30; the busbar 20 is connected to multiple segmented busbars 10, and a quick-break current limiter 11 is provided between the busbar 20 and the segmented busbar 10; each electrical equipment 50 is connected to at least one segmented busbar 10.

[0029] The above-mentioned wind power supply and distribution system 100 realizes an isolated grid power supply and distribution system of the wind power generation equipment 40 through the segmented busbar 10 and the busbar 20, that is, the wind power generation equipment 40 does not need to be connected to the land power grid, and can directly supply power to the offshore power equipment 50; when a short-circuit fault occurs, the circuit can be protected by the fast-break current limiter 11, which acts at the initial stage of the short-circuit current rise, and disconnects the segmented busbar 10 and the busbar 20 before the instantaneous value of the current reaches the tolerance limit. 0 connection, compared with the traditional single busbar segmentation, due to the use of the busbar 20, no matter which segmented busbar 10 and the busbar 20 between the quick-break current limiter 11 is actuated, the other segmented busbars 10 can still be connected together, thereby enhancing the stability of the system. Therefore, under normal operating conditions, multiple segmented busbars 10 of the wind power supply and distribution system 100 are normally closed and connected to the same busbar, and the power supply is relatively stable. In the event of a short circuit, the quick-break current limiter 11 can quickly separate the multiple segmented busbars 10, which is safe and reliable.

[0030] Specifically, Figure 2 As shown, in one embodiment, a bus tie protection switch 12 is provided between the fast-break current limiter 11 and the segmented busbar 10 .

[0031] The above-mentioned wind power supply and distribution system 100 is provided with a bus tie protection switch 12 between the quick-break current limiter 11 and the segmented busbar 10. When a short circuit fault occurs, if the short circuit current is small, it is protected by the bus tie protection switch 12. If the short circuit current exceeds the range, it is protected by the quick-break current limiter 11, thereby improving the safety of the wind power supply and distribution system 100.

[0032] In this specific embodiment, five segmented busbars 10 are provided. During normal operation, the bus tie protection switch 12 is in a normally closed state, so that all five segmented busbars 10 are connected together, thereby increasing the stability of the power supply and distribution system 100.

[0033] Specifically, in one embodiment, the collector circuit 30 is a submarine cable, and a cable converter 31 is provided between the wind power generation equipment 40 and the segmented busbar 10 .

[0034] Specifically, in one embodiment, the voltage level of the segmented busbar 10 , the busbar 20 , and the quick-break current limiter 11 is the same as that of the wind power generation equipment 40 .

[0035] Specifically, Figure 1 As shown, in one embodiment, the wind power supply and distribution system 100 further includes an air insulation cabinet 60 , and the segmented busbar 10 and the busbar 20 are both installed in the air insulation cabinet 60 .

[0036] Furthermore, in one embodiment, the voltage level of the power-consuming equipment 50 is lower than the voltage level of the wind power generating equipment 40 , and a transformer 51 is provided between the segmented busbar 10 and the power-consuming equipment 50 .

[0037] Furthermore, if Figure 2 As shown, in one embodiment, the voltage level of the wind power generation equipment 40 is 35 kV.

[0038] Specifically, Figure 2 As shown, in one embodiment, each segmented busbar 10 is connected to at most four collector circuits 30 .

[0039] Specifically, Figure 1 As shown, in one embodiment, each collector circuit 30 is connected to at most three wind power generation devices 40 .

[0040] Specifically, Figure 1 As shown, in one embodiment, the electrical equipment 50 includes a hydrogen production device. It can be understood that the electrical equipment is not only applicable to hydrogen production equipment, but also to other electrical equipment; and the power supply equipment is not only applicable to wind energy, but also to other forms of energy generation, and has a wide range of applications.

[0041] Each segmented busbar is connected to a 120MW wind power generation equipment 40 and a hydrogen production equipment, and each segmented busbar 10 is connected to a bus tie protection switch 12 and a quick-break current limiter 11, and then connected through a busbar 20. This component setting limits the maximum rated current of each 35kV segmented busbar 10, bus tie protection switch 12, and quick-break current limiter 11 to within 2500A, ensuring the feasibility of the system.

[0042] In this specific embodiment, the voltage level of the wind power generation equipment 40 is 35kV, the power of a single wind power generation equipment 40 is 10MW, each collector circuit 30 is connected to 3 wind turbines, the power of each collector circuit 30 is 30MW, there are 20 collector circuits 30 in total, and the maximum power of the entire wind turbine group is 600MW.

[0043] The submarine cable corresponding to each collector loop 30 is affected by the loop voltage drop. Usually, the maximum cross-sectional area of ​​the submarine cable is 3x400mm. 2 .

[0044] The voltage level of the segmented busbar 10 is 35kV. Each segmented busbar 10 is connected to a maximum of 4 wind turbine collector circuits 30. The power of each collector circuit 30 is 30MW. The maximum power of each segmented busbar 10 is 120MW, and the maximum rated current is 2500A. The voltage level of the bus tie protection switch 12 is 35kV, the maximum rated current is 2500A, and the short-circuit current is 31.5kA.

[0045] The quick-break current limiter 11 limits the short-circuit current in the initial stage so that it will not reach the maximum expected peak value, and can effectively limit the short-circuit current. The voltage level of the quick-break current limiter 11 is 35kV, the maximum rated current is 2500A, the rated short-circuit breaking current is up to 140kA, and the response time is within 1ms.

[0046] The busbar 20 connects all the segmented busbars 10 at a common point through the bus tie protection switch 12 and the quick-break current limiter 11. The maximum rated current of the busbar 20 is 5000A.

[0047] The voltage level of the hydrogen production equipment is 2kV, the maximum rated current of the hydrogen production equipment incoming line protection device is 4000A, and the maximum power of a single hydrogen production circuit is 10MW.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0053] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An isolated grid wind power supply and distribution system for deep sea, characterized in that: include: A plurality of segmented busbars (10), each of the segmented busbars (10) being electrically connected to a plurality of collector circuits (30), and each of the collector circuits (30) being connected in series to a plurality of wind power generation devices (40); A busbar (20), wherein the busbar (20) is respectively connected to the plurality of segmented busbars (10), and a quick-break current limiter (11) is provided between the busbar (20) and the segmented busbars (10); A plurality of electrical devices (50), each of the electrical devices (50) being connected to at least one of the segmented busbars (10).

2. The isolated grid wind power supply and distribution system for deep sea according to claim 1, characterized in that: A busbar protection switch (12) is provided between the quick-break current limiter (11) and the segmented busbar (10).

3. The isolated grid wind power supply and distribution system for deep sea according to claim 1, characterized in that: The current collecting circuit (30) is a submarine cable, and a cable converter (31) is provided between the wind power generation equipment (40) and the segmented busbar (10).

4. The isolated grid wind power supply and distribution system for deep sea according to claim 1, characterized in that: The voltage levels of the segmented busbar (10), the busbar (20), and the quick-break current limiter (11) are the same as the voltage level of the wind power generation equipment (40).

5. The isolated grid wind power supply and distribution system for deep sea according to claim 4, characterized in that: The wind power supply and distribution system further comprises an air insulation cabinet (60), wherein the segmented busbar (10) and the busbar (20) are both installed in the air insulation cabinet (60).

6. The isolated grid wind power supply and distribution system for deep sea according to claim 4, characterized in that: The voltage level of the electrical equipment (50) is lower than the voltage level of the wind power generation equipment (40), and a transformer (51) is provided between the segmented busbar (10) and the electrical equipment (50).

7. The isolated grid wind power supply and distribution system for deep sea according to claim 1, characterized in that: The voltage level of the wind power generation equipment (40) is 35 kV.

8. The isolated grid wind power supply and distribution system for deep sea according to claim 1, characterized in that: Each segmented busbar (10) is connected to a maximum of four current collecting circuits (30).

9. The isolated grid wind power supply and distribution system for deep sea according to claim 1, characterized in that: Each of the power collection circuits (30) is connected to a maximum of three wind power generation devices (40).

10. The isolated grid wind power supply and distribution system for deep sea according to claim 1, characterized in that: The electrical equipment (50) includes hydrogen production equipment.

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