A wiring form for an onshore converter station with parallel arrangement of DC field and AC field

Abstract

The present invention provides a wiring form for an onshore converter station with parallel arrangement of a DC field and an AC field, which relates to the field of converter stations. The onshore converter station includes an AC field, a coupling transformer, an AC distribution device on the valve side of the coupling transformer, a starting circuit, a valve hall and a DC field connected in sequence. A first framework is provided on the outgoing line side of the AC field, and there is a main transportation path between the first framework and the coupling transformer; the outgoing line side of the AC field is electrically connected to the coupling transformer; the AC distribution device on the valve side of the coupling transformer is on the side far from the AC field, and the coupling transformer is electrically connected to the AC distribution device on the valve side; the AC distribution device on the valve side of the coupling transformer, the starting circuit, the valve hall and the DC field are electrically connected in sequence. A second framework and a third framework are provided on the side of the AC distribution device on the valve side corresponding to the AC field, and a second transmission line is erected between the second framework and the third framework; there is an auxiliary road between the starting circuit and the third framework, and the AC distribution device on the valve side of the coupling transformer, the valve hall and the DC field are located on both sides of the auxiliary road.

Description

Technical Field

[0001] The present invention relates to the technical field of converter stations, and particularly to a wiring form of an onshore converter station for parallel arrangement of a DC field and an AC field. Background Art

[0002] As a green energy source, offshore wind power is being gradually developed on a large scale. For deep - sea and far - sea offshore wind power, flexible DC transmission technology is increasingly used to transmit wind power. An onshore converter station is an important part of the flexible DC transmission system for deep - sea and far - sea offshore wind power, and is built adjacent to the coastline, requiring reasonable layout design.

[0003] For example, a Chinese patent application for invention with the application publication number CN113991747A and the application publication date of January 28, 2022 discloses an onshore flexible DC converter station, specifically discloses a true bipolar converter system with pole - one and pole - two symmetric arrangement, including an overhead line, which is sequentially connected to an AC distribution area, a converter transformer area, a starting circuit area, a converter valve area, and a DC distribution area; the power supply input end of the AC distribution area is connected to an AC overhead incoming line, and the power supply input end of the DC distribution area is connected to a DC overhead line. The working principle of this onshore flexible DC converter station is as follows: the AC distribution area distributes and transmits the incoming alternating current through outdoor GIS equipment and outdoor GIL equipment to the converter transformer area. After the converter transformer area converts the incoming alternating current voltage, it reaches the converter valve area through the starting circuit area to convert the alternating current into direct current, which is sent to the DC distribution area for distribution, and finally output through the DC overhead line.

[0004] In the existing onshore flexible DC converter station, each device is arranged according to functional areas through the AC distribution area, the converter transformer area, the starting circuit area, the converter valve area, and the DC distribution area, and the overall layout of the whole station is compact and reasonable. However, the existing onshore converter station is only applicable to the case where the DC field and the AC field are arranged in a straight - line. Due to the limitation of the site environment, it is required to adjust the layout of the valve hall and the DC field and the AC field. The spatial layout and wiring method of the existing converter station cannot be applied to the case where the DC field and the AC field are arranged in parallel. Summary of the Invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a wiring form of an onshore converter station for parallel arrangement of a DC field and an AC field, so as to solve the problem that the spatial layout and wiring method of the existing converter station cannot be applied to the parallel arrangement of the DC field and the AC field.

[0006] The technical solution of the wiring form of the onshore converter station for parallel arrangement of a DC field and an AC field of the present invention is as follows:

[0007] The wiring form of an onshore converter station for parallel arrangement of DC field and AC field includes an AC field, a coupling transformer, an AC distribution device on the valve side of the coupling transformer, a starting circuit, a valve hall and a DC field connected in sequence. A first framework is provided on the outgoing line side of the AC field. The first framework and the coupling transformer are arranged at intervals, and a main transportation road is provided between the first framework and the coupling transformer;

[0008] The outgoing line side of the AC field is electrically connected to the coupling transformer, and a first transmission line is erected between the first framework and the coupling transformer. The AC distribution device on the valve side of the coupling transformer is arranged on the side of the coupling transformer away from the AC field, and the coupling transformer is electrically connected to the AC distribution device on the valve side of the coupling transformer;

[0009] The AC distribution device on the valve side of the coupling transformer, the starting circuit, the valve hall and the DC field are electrically connected in sequence. A second framework and a third framework are further provided on the side of the AC distribution device on the valve side corresponding to the AC field. The second framework is located on one side of the main transportation road, and the third framework is located on the other side of the main transportation road. A second transmission line is erected between the second framework and the third framework;

[0010] The starting circuit and the third framework are arranged at intervals in the extending direction of the main transportation road. An auxiliary road is provided between the starting circuit and the third framework. The AC distribution device on the valve side of the coupling transformer is located on one side of the auxiliary road, and the valve hall and the DC field are located on the other side of the auxiliary road.

[0011] Further, the extending direction of the main transportation road is arranged parallel to the length direction of the outgoing line side of the AC field, and the extending direction of the auxiliary road is arranged perpendicular to the extending direction of the main transportation road.

[0012] Further, the first framework, the third framework and the starting circuit are sequentially distributed along the extending direction parallel to the main transportation road, and the first framework, the coupling transformer and the AC distribution device on the valve side of the coupling transformer are sequentially distributed along the extending direction parallel to the auxiliary road.

[0013] Further, there are two or more first frameworks. Two or more first frameworks are distributed at intervals along the extending direction parallel to the main transportation road. A voltage transformer and a lightning arrester are installed at the first framework, and the voltage transformer and the lightning arrester are respectively connected to the first transmission line.

[0014] Further, there are two or more connection transformers, and the two or more connection transformers are spaced apart along the extension direction parallel to the main transportation road. A firewall is provided between adjacent two connection transformers, and the first frame is respectively connected to the corresponding connection transformer by the first transmission line.

[0015] Further, a GIS overhead outlet bushing is provided between the connection transformer and the valve side AC distribution device of the connection transformer. Conductors are sequentially connected between the connection transformer, the GIS overhead outlet bushing and the valve side AC distribution device of the connection transformer.

[0016] Further, the second frame and the connection transformer are arranged at intervals along the extension direction parallel to the main transportation road, and a GIS branch bus is connected between the valve side AC distribution device of the connection transformer and the second frame.

[0017] Further, a GIS branch bus crossing the auxiliary road is connected between the third frame and the starting circuit. The starting circuit includes a current transformer, a starting resistor and a bypass disconnector, and the current transformer, the starting resistor and the bypass disconnector are electrically connected.

[0018] Further, the valve hall and DC yard is a valve hall and DC yard integrated with a valve hall. A wall bushing is provided on one side of the valve hall and DC yard corresponding to the starting circuit, and a control building is also adjacent to the outside of the valve hall and DC yard.

[0019] Beneficial effects: The wiring form of the onshore converter station with the DC yard and AC yard arranged in parallel adopts a design form that sequentially connects the AC yard, the connection transformer, the valve side AC distribution device of the connection transformer, the starting circuit and the valve hall and DC yard. The outlet side of the AC yard corresponds to the first frame. The first frame and the connection transformer are arranged at intervals, and a main transportation road is provided at the interval between the two. A first transmission line is erected between the first frame and the connection transformer, which can be used for the transportation and installation of the connection transformer, and at the same time meet the space requirements for the maintenance and test of the connection transformer.

[0020] The valve side AC distribution device of the connection transformer is arranged on the side of the connection transformer away from the AC yard. A second frame and a third frame are also provided on the side of the valve side AC distribution device of the connection transformer corresponding to the AC yard. The second frame is located on one side of the main transportation road, and the third frame is located on the other side of the main transportation road. A second transmission line is erected between the second frame and the third frame, ensuring the unobstructed main transportation road and facilitating the later implementation of maintenance operations.

[0021] Moreover, the starting circuit and the third framework are arranged at intervals in the extending direction of the main transportation road. There is an auxiliary road between the starting circuit and the third framework. The connecting transformer valve side AC power distribution device is located on one side of the auxiliary road, and the valve hall and the DC yard are located on the other side of the auxiliary road. The third framework, the starting circuit, the valve hall and the DC yard are electrically connected in sequence. An auxiliary road is designed between the third framework and the starting circuit. The connecting transformer valve side AC power distribution device and the valve hall and the DC yard are distributed on both sides of the auxiliary road, and the auxiliary road meets the requirements of in-station passage.

[0022] First, the AC power distribution device leads the transmission line across the main transportation road through the first framework to one side of the connecting transformer. After passing through the connecting transformer and the connecting transformer valve side AC power distribution device, the transmission line is led across the main transportation road through the second framework to the outgoing line side of the AC yard; the transmission line is led across the auxiliary road through the third framework to the starting circuit and finally connected to the valve hall and the DC yard to achieve the purpose of the entire converter station electrical process flow. The layout design of the first framework, the second framework, the third framework, the main transportation road and the auxiliary road makes the AC yard, the connecting transformer, the connecting transformer valve side AC power distribution device, the starting circuit, the valve hall and the DC yard arranged in sequence in an S shape, which is applicable to the situation where the valve hall and the DC yard are arranged in parallel with the AC yard due to site limitations. Brief Description of the Drawings

[0023] Figure 1 is a plan schematic diagram of the onshore converter station wiring form for parallel arrangement of the DC yard and the AC yard in a specific embodiment of the onshore converter station wiring form for parallel arrangement of the DC yard and the AC yard according to the present invention;

[0024] Figure 2 is Figure 1 a cross-sectional schematic diagram of the onshore converter station wiring form for parallel arrangement of the DC yard and the AC yard at A - A in;

[0025] Figure 3 is Figure 1 a cross-sectional schematic diagram of the onshore converter station wiring form for parallel arrangement of the DC yard and the AC yard at B - B in;

[0026] Figure 4 is Figure 1 a cross-sectional schematic diagram of the onshore converter station wiring form for parallel arrangement of the DC yard and the AC yard at C - C in.

[0027] In the figure: 1 - connecting transformer, 10 - main transportation road, 11 - first framework, 111 - voltage transformer, 112 - lightning arrester, 113 - GIS overhead outgoing line bushing, 12 - second framework, 13 - third framework, 14 - firewall;

[0028] 2 - Converter valve side AC distribution device, 20 - Auxiliary road, 21 - First transmission line, 22 - Second transmission line, 23 - GIS branch busbar, 24 - GIS branch busbar across the auxiliary road;

[0029] 3 - Starting circuit, 31 - Current transformer, 32 - Post insulator, 33 - Starting resistor, 34 - Bypass disconnector, 4 - Valve hall and DC yard, 5 - Control building. Specific embodiments

[0030] The following will further describe in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0031] Specific embodiment 1 of the wiring form of the onshore converter station for parallel arrangement of the DC yard and the AC yard of the present invention is as Figures 1 to 4 shown. The wiring form of the onshore converter station for parallel arrangement of the DC yard and the AC yard includes an AC yard, a connection transformer 1, a converter valve side AC distribution device 2, a starting circuit 3, and a valve hall and DC yard 4 connected in sequence. A first framework 11 is provided on the outgoing line side of the AC yard. Figure 1 The pointed direction by the arrowhead in the figure is the outgoing line direction of the AC yard. The first framework 11 and the connection transformer 1 are arranged at intervals, and a main transportation road 10 is provided between the first framework 11 and the connection transformer 1; the outgoing line side of the AC yard is electrically connected to the connection transformer 1, and a first transmission line 21 is erected between the first framework 11 and the connection transformer 1; the converter valve side AC distribution device 2 is arranged on the side of the connection transformer 1 away from the AC yard, and the connection transformer 1 is electrically connected to the converter valve side AC distribution device 2.

[0032] On the side of the converter valve side AC distribution device 2 corresponding to the AC yard, there are also a second framework 12 and a third framework 13. The second framework 12 is located on one side of the main transportation road 10, and the third framework 13 is located on the other side of the main transportation road 10. The converter valve side AC distribution device 2 is electrically connected to the second framework 12, and a second transmission line 22 is erected between the second framework 12 and the third framework 13; the starting circuit 3 and the third framework 13 are arranged at intervals in the extending direction of the main transportation road 10. An auxiliary road 20 is provided between the starting circuit 3 and the third framework 13. The converter valve side AC distribution device 2 is located on one side of the auxiliary road 20, and the valve hall and DC yard 4 are located on the other side of the auxiliary road 20, and the third framework 13, the starting circuit 3, and the valve hall and DC yard 4 are electrically connected in sequence.

[0033] The wiring form of the onshore converter station with the DC field and AC field arranged in parallel adopts a design form that successively connects the AC field, the connection transformer 1, the AC distribution device 2 on the valve side of the connection transformer, the starting circuit 3, and the valve hall and DC field 4. The outgoing line side of the AC field corresponds to the first frame 11. The first frame 11 and the connection transformer 1 are arranged at intervals, and a main transportation road 10 is set at the interval between them. A first transmission line 21 is erected between the first frame 11 and the connection transformer 1, which can be used for the transportation and installation of the connection transformer 1 and at the same time meet the space requirements for the maintenance and testing of the connection transformer 1.

[0034] The AC distribution device on the valve side of the connection transformer 2 is arranged on the side of the connection transformer 1 far from the AC field. On the side of the AC distribution device on the valve side of the connection transformer 2 corresponding to the AC field, there are also a second frame 12 and a third frame 13. The second frame 12 is located on one side of the main transportation road 10, and the third frame 13 is located on the other side of the main transportation road 10. A second transmission line 22 is erected between the second frame 12 and the third frame 13, ensuring the unobstructed passage of the main transportation road 10 and facilitating the later implementation of maintenance operations.

[0035] Moreover, the starting circuit 3 and the third frame 13 are arranged at intervals in the extending direction of the main transportation road 10. There is an auxiliary road 20 between the starting circuit 3 and the third frame 13. The AC distribution device on the valve side of the connection transformer 2 is located on one side of the auxiliary road 20, and the valve hall and DC field 4 are located on the other side of the auxiliary road 20, and the third frame 13, the starting circuit 3 and the valve hall and DC field 4 are electrically connected in sequence. An auxiliary road 20 is designed between the third frame 13 and the starting circuit 3. The AC distribution device on the valve side of the connection transformer 2 and the valve hall and DC field 4 are distributed on both sides of the auxiliary road 20, and the auxiliary road 20 meets the requirements of in-station traffic.

[0036] First of all, the AC distribution device leads the transmission line across the main transportation road 10 through the first frame 11 to one side of the connection transformer 1. After passing through the connection transformer 1 and the AC distribution device 2 on the valve side of the connection transformer, the transmission line is led across the main transportation road 10 through the second frame 12 to the outgoing line side of the AC field; the transmission line is led across the auxiliary road through the third frame 13 to the starting circuit 3, and finally connected to the valve hall and DC field 4 to achieve the purpose of the entire converter station electrical process flow. The layout design of the first frame 11, the second frame 12, the third frame 13, the main transportation road 10 and the auxiliary road 20 makes the AC field, the connection transformer 1, the AC distribution device 2 on the valve side of the connection transformer, the starting circuit 3 and the valve hall and DC field 4 arranged in sequence in an S shape, which is suitable for the situation where the DC field and AC field are arranged in parallel due to site limitations.

[0037] In this embodiment, the extending direction of the main transportation road 10 is arranged parallel to the length direction of the outgoing line side of the AC field, and the extending direction of the auxiliary road 20 is arranged perpendicular to the extending direction of the main transportation road 10. Among them, the first frame 11, the third frame 13, and the starting circuit 3 are sequentially distributed along the extending direction parallel to the main transportation road 10, and the first frame 11, the connecting transformer 1, and the AC distribution device 2 on the valve side of the connecting transformer are sequentially distributed along the extending direction parallel to the auxiliary road 20. The corresponding devices are arranged in zones, and the layout design is more reasonable.

[0038] As a further preferred solution, there are two or more first frames 11, and two or more first frames 11 are spaced apart along the extending direction parallel to the main transportation road 10. A voltage transformer 111 and a lightning arrester 112 are installed at the first frame 11, and the voltage transformer 111 and the lightning arrester 112 are respectively connected to the first transmission line 21. Correspondingly, there are two or more connecting transformers 1, and two or more connecting transformers 1 are spaced apart along the extending direction parallel to the main transportation road 10. A firewall 14 is provided between two adjacent connecting transformers 1, and the first frame 11 and the corresponding connecting transformer 1 are respectively connected by a first transmission line 21. Specifically, both the first transmission line 21 and the second transmission line 22 are overhead flexible wires.

[0039] In this embodiment, a lightning arrester 112 and a GIS overhead outgoing line bushing 113 are provided between the connecting transformer 1 and the AC distribution device 2 on the valve side of the connecting transformer, and wires are sequentially connected between the connecting transformer 1, the GIS overhead outgoing line bushing 113, and the AC distribution device 2 on the valve side. Among them, the second frame 12 and the connecting transformer 1 are spaced apart along the extending direction parallel to the main transportation road 10, and a GIS branch bus 23 is connected between the AC distribution device 2 on the valve side of the connecting transformer and the second frame 12. Specifically, the wire includes a part of the overhead flexible wire and a part of the GIS branch bus. The connecting transformer 1 is connected to the lightning arrester 112 and the GIS overhead outgoing line bushing 113 through the overhead flexible wire, and the GIS overhead outgoing line bushing 113 is connected to the AC distribution device 2 on the valve side of the connecting transformer through the GIS branch bus 23.

[0040] In addition, a GIS branch bus 24 crossing the auxiliary road is connected between the third frame 13 and the starting circuit 3. The starting circuit 3 includes a current transformer 31, a post insulator 32, a starting resistor 33, and a bypass disconnector 34, and the current transformer 31, the starting resistor 33, and the bypass disconnector 34 are electrically connected. The valve hall and DC field 4 is a valve hall and DC field integrated with a valve hall. A wall bushing is provided on one side of the valve hall and DC field 4 corresponding to the starting circuit 3, and a control building 5 is also adjacent to the outside of the valve hall and DC field 4.

[0041] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An onshore converter station wiring form for parallel arrangement of DC field and AC field, characterized in that, It includes an AC field, a connecting transformer, an AC distribution device on the valve side of the connecting transformer, a starting circuit, a valve hall, and a DC field that are connected in sequence. A first framework is provided on the outgoing line side of the AC field. The first framework and the connecting transformer are arranged at intervals, and a main transportation road is provided between the first framework and the connecting transformer. The outgoing line side of the AC field is electrically connected to the connecting transformer, and a first transmission line is erected between the first framework and the connecting transformer. The AC distribution device on the valve side of the connecting transformer is arranged on the side of the connecting transformer away from the AC field, and the connecting transformer is electrically connected to the AC distribution device on the valve side of the connecting transformer. The AC distribution device on the valve side of the connecting transformer, the starting circuit, the valve hall, and the DC field are electrically connected in sequence. On the side of the AC distribution device on the valve side of the connecting transformer corresponding to the AC field, there are also a second framework and a third framework. The second framework is located on one side of the main transportation road, and the third framework is located on the other side of the main transportation road. A second transmission line is erected between the second framework and the third framework. The starting circuit and the third framework are arranged at intervals in the extending direction of the main transportation road. A secondary road is provided between the starting circuit and the third framework. The AC distribution device on the valve side of the connecting transformer is located on one side of the secondary road, and the valve hall and the DC field are located on the other side of the secondary road. The extending direction of the main transportation road is arranged parallel to the length direction of the outgoing line side of the AC field, and the extending direction of the secondary road is arranged perpendicular to the extending direction of the main transportation road. The first framework, the third framework, and the starting circuit are distributed in sequence along the extending direction parallel to the main transportation road, and the first framework, the connecting transformer, and the AC distribution device on the valve side of the connecting transformer are distributed in sequence along the extending direction parallel to the secondary road.

2. The wiring form of the onshore converter station for parallel arrangement of DC field and AC field according to claim 1, wherein There are two or more first frameworks. Two or more first frameworks are distributed at intervals along the extending direction parallel to the main transportation road. A voltage transformer and a lightning arrester are installed at the first framework, and the voltage transformer and the lightning arrester are respectively connected to the first transmission line.

3. The wiring form of the onshore converter station for parallel arrangement of DC field and AC field according to claim 2, characterized in that, There are two or more connecting transformers. Two or more connecting transformers are distributed at intervals along the extending direction parallel to the main transportation road. A firewall is provided between adjacent two connecting transformers, and the first transmission lines are respectively connected between the first framework and the corresponding connecting transformer.

4. The wiring form of the onshore converter station for parallel arrangement of DC field and AC field according to claim 3, characterized in that A GIS overhead outgoing line bushing is provided between the connecting transformer and the AC distribution device on the valve side of the connecting transformer, and wires are connected in sequence between the connecting transformer, the GIS overhead outgoing line bushing, and the AC distribution device on the valve side of the connecting transformer.

5. The wiring form of the onshore converter station for parallel arrangement of DC field and AC field according to claim 1, characterized in that, The second framework and the connecting transformer are arranged at intervals along the extending direction parallel to the main transportation road, and a GIS branch bus is connected between the AC distribution device on the valve side of the connecting transformer and the second framework.

6. The wiring form of the onshore converter station for parallel arrangement of the DC field and the AC field according to claim 1, characterized in that A GIS branch bus spanning the auxiliary road is connected between the third frame and the starting circuit. The starting circuit includes a current transformer, a starting resistor, and a bypass disconnector, and the current transformer, the starting resistor, and the bypass disconnector are electrically connected.

7. The wiring form of the onshore converter station for parallel arrangement of DC field and AC field according to claim 1, characterized in that, The valve hall and DC yard are an integrated valve hall and DC yard with a valve hall. A wall bushing is provided on one side of the valve hall and DC yard corresponding to the starting circuit, and a control building is also provided adjacent to the outside of the valve hall and DC yard.

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