CN113612248A

CN113612248A - Compact and light marine flexible direct current converter station

Info

Publication number: CN113612248A
Application number: CN202110991396.0A
Authority: CN
Inventors: 齐彦军; 盛俊毅; 张军; 张学成
Original assignee: Tbea Xi'an Flexible Power T&d Co ltd; TBEA Xinjiang Sunoasis Co Ltd
Current assignee: Tbea Xi'an Flexible Power T&d Co ltd; TBEA Xinjiang Sunoasis Co Ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-11-05

Abstract

The invention discloses a compact and light marine flexible direct current converter station which comprises three parts, namely a foundation pile, a jacket and an upper module. The upper module comprises a multilayer converter platform, a roof layer, a network side GIS, a flexible direct current transformer, a valve side GIS, a bridge arm alternating current GIS, a flexible direct current converter valve, a bridge arm direct current GIS, a bridge arm reactor, a direct current field GIS and other auxiliary equipment. The invention is applied to the offshore wind power flexible direct current convertor station, and compared with the traditional offshore wind power flexible direct current convertor station, the invention adopts a 5-layer convertor platform arrangement. Except for the converter valve, the transformer and the bridge arm reactor, other main primary electrical equipment adopts a GIS (gas insulated metal enclosed switchgear) type. Main wiring in the valve hall is laid in an overhead mode through multi-split aluminum stranded wires, other main wiring is laid through a trench through high-voltage cables, and the converter station has the advantages of small overall occupied area, light overall weight and the like.

Description

Compact and light marine flexible direct current converter station

Technical Field

The invention belongs to the technical field of offshore wind power generation, and particularly relates to a compact and light offshore flexible direct current converter station.

Background

With the continuous increase of energy demand and the continuous increase of environmental protection pressure, unprecedented opportunities are brought to the development of new energy, especially offshore wind power. Compared with onshore wind power, offshore wind power has the advantages of green, low carbon, environmental protection, large reserve, high wind speed, high wind power density and the like, is very suitable for running of a large-capacity wind turbine generator, is close to a load center in a coastal economically developed area, and is good in transmission economy.

At present, most offshore wind power adopts an alternating current sending mode, but the alternating current sending mode has the problems of short transmission distance, small transmission capacity and the like. The flexible direct current transmission technology has the advantages of long transmission distance, large transmission capacity, low loss and the like, and is more suitable for large-scale offshore wind power transmission in deep and open sea.

Flexible dc transmission technology has found widespread use in europe, and in particular germany. In recent years, the flexible direct current transmission technology in China is developed rapidly, and the currently built offshore wind power flexible direct current transmission project is +/-400 kV/1100MW, such as the east-sea wind power flexible direct current transmission project.

The conventional offshore flexible direct current converter station mainly has the following defects:

1) the offshore flexible direct current converter station has larger volume and small power density;

2) the offshore flexible direct current converter station has larger mass, is inconvenient for integral transportation, and has fewer ships conforming to consignment;

3) the construction and primary equipment cost of the offshore flexible direct current converter station are high.

Disclosure of Invention

The invention provides a compact and light offshore flexible direct current converter station, which reduces the volume and weight of the direct current converter station.

In order to achieve the above purpose, the compact and lightweight marine flexible direct current converter station provided by the invention comprises an upper module installed on a jacket, wherein a first layer of converter platform is arranged in the upper module, the first layer of converter platform comprises a flexible direct current converter valve, a bridge arm reactor, bridge arm direct current side equipment and direct current field equipment, and a flexible direct current transformer, a station transformer, network side equipment, bridge arm alternating current side equipment and valve side equipment are arranged above the first layer of converter platform; the bridge arm direct current side equipment comprises a direct current side light CT, a lightning arrester and a grounding switch, and the direct current side light CT, the lightning arrester and the grounding switch are in a gas insulated metal enclosed type combined electrical apparatus type to form a bridge arm direct current GIS; the direct current field equipment comprises a direct current field optical CT, a grounding switch, an isolating switch and a lightning arrester, wherein the direct current field optical CT, the grounding switch, the isolating switch and the lightning arrester are all in a gas insulated metal enclosed type combined electrical apparatus type, and a direct current field GIS is formed.

Furthermore, the network side equipment comprises a network side CT, a lightning arrester, a grounding switch, a disconnecting switch, a bus, a circuit breaker and a voltage transformer, wherein the network side CT, the lightning arrester, the grounding switch, the disconnecting switch, the bus, the circuit breaker and the voltage transformer all adopt a gas insulated metal enclosed type combined electrical apparatus type to form a network side GIS; the bridge arm alternating current side equipment comprises a bridge arm alternating current side light CT, a lightning arrester and a grounding switch, wherein the bridge arm alternating current side light CT, the lightning arrester and the grounding switch are all in a gas insulated metal closed type combined electrical apparatus type to form a bridge arm alternating current GIS; the valve side equipment comprises a valve side bus, an optical CT, a lightning arrester, a circuit breaker, a grounding switch, a disconnecting switch and a voltage transformer, wherein the valve side bus, the optical CT, the lightning arrester, the circuit breaker, the grounding switch, the disconnecting switch and the voltage transformer are all in a gas insulated metal enclosed type combined electrical apparatus type, and a valve side GIS is formed.

Furthermore, the grid-side GIS is arranged in the first compartment, the two flexible-direct transformers are respectively arranged in the second compartment and the third compartment, the two station transformers are respectively arranged in the fourth compartment and the fifth compartment, and both the bridge arm alternating-current GIS and the valve-side GIS are arranged in the sixth compartment.

Furthermore, the flexible direct current converter valve, the bridge arm direct current GIS, the bridge arm reactance and the direct current field GIS are all arranged in a converter station valve hall, and main connecting wires in the converter station valve hall are all laid in an overhead mode by multi-split aluminum stranded wires.

Furthermore, the flexible direct current converter valve has six bridge arms, each bridge arm comprises one to three supporting flexible straight valve towers or three to six suspension type flexible straight valve towers, and the bridge arms are arranged according to the phase sequence of the A phase, the B phase, the C phase, the B phase and the A phase.

Further, the converter station electrical system wiring is: the AC inlet wire of the converter station is connected with the network side GIS inlet wire end, the network side GIS outlet wire end is connected with the network side port of the flexible direct-current transformer, the valve side port of the flexible direct-current transformer is connected with the valve side GIS inlet wire end, the valve side GIS outlet wire end is connected with the inlet wire end of the bridge arm AC GIS, the outlet wire end of the bridge arm AC GIS is connected with the AC side port of the flexible direct-current converter valve, the DC side port of the flexible direct-current converter valve is connected with the inlet wire end of the bridge arm DC GIS, the outlet wire end of the bridge arm DC GIS is connected with the inlet wire end of the bridge arm reactor, the outlet wire end of the bridge arm reactor is connected with the inlet wire end of the DC field GIS, and the outlet wire end of the DC field GIS is connected with the DC outlet wire of the converter station.

Further, bridge arm reactances are arranged according to the phase sequence of A phase-B phase-C phase-B phase-A phase according to the arrangement of converter valves in the valve hall.

Furthermore, the flexible-direct transformer consists of two three-phase transformers.

Further, a flexible-straight transformer is arranged at the middle position of the platform.

Furthermore, the upper module is arranged on the jacket at sea by adopting a high-position floating method.

Compared with the prior art, the invention has at least the following beneficial technical effects:

the arrangement of a plurality of layers of convertor platforms is adopted, the structure is compact, and the floor area of the convertor station is reduced; meanwhile, except for the converter valve, the transformer and the bridge arm reactance, other main primary electrical equipment are in a gas-insulated metal closed type combined electrical apparatus type, so that the total volume is reduced to about 70% of the original volume, the structure is compact, the occupied area is small, the occupied area and the volume of the whole converter station are reduced, the transportation is convenient, and the weight and the steel consumption of the whole converter station are reduced.

Furthermore, main wiring in the valve hall is laid in an overhead mode through multi-split aluminum stranded wires, the rest main wiring is laid through a trench through high-voltage cables, and the converter station has the advantages of small overall occupied area, light overall weight and the like.

Furthermore, the flexible direct current converter valve 11 has 6 bridge arms in total, each bridge arm comprises 1 to 3 supporting type flexible straight valve towers or 3 to 6 suspension type flexible straight valve towers, the support type flexible straight valve towers or the suspension type flexible straight valve towers are arranged according to the phase sequence of the A phase-B phase-C phase-B phase-A phase, the wiring is simple, the occupied area of the converter valve is favorably reduced, and the length direction of the converter valve is reduced by 5 to 10 percent.

Furthermore, two three-phase transformers are selected as the flexible-direct transformers, so that the occupied area and the manufacturing cost are reduced.

Furthermore, the flexible-direct transformer is arranged in the middle of the platform, so that the stress balance of the commutation platform is ensured.

Drawings

FIG. 1 is a schematic view of the upper module of a compact, lightweight marine flexible DC converter station;

FIG. 2 is a top view of an upper module of a compact, lightweight offshore flexible DC converter station;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic plan view of a first layer of a converter platform;

FIG. 5 is a schematic plan view of a second layer of the converter platform;

FIG. 6 is a schematic diagram of a third stage converter platform arrangement;

FIG. 7 is a schematic plan view of a fourth layer of the converter platform;

FIG. 8 is a schematic plan view of a fifth layer of a converter platform;

fig. 9 is a schematic plan view of a roof deck.

In the drawings: 1. a first layer of a current conversion platform; 2. a second layer of commutating platform; 3. a third layer of conversion platform; 4. a fourth layer of commutation platform; 5. a fifth layer of commutation platform; 6. a roof layer; 11. a flexible direct current converter valve; 12. bridge arm direct current GIS; 13. a bridge arm reactance; 14. a direct current field GIS; 15. a seawater pump house; 16. a valve cooling equipment room; 17. a converter station valve hall; 21. the first valve hall is arranged above the first valve hall; 22. separating rooms; 31. the second valve hall is above; 32. a secondary equipment room; 41. a network side GIS; 42. a flexible-direct transformer; 43. a station transformer; 44. a firewood chamber; 45. bridge arm alternating current GIS; 46. a valve side GIS; 47. a first compartment; 48. a second compartment; 49. a third compartment; 410. a fourth compartment; 411. a fifth compartment; 51. the GIS on the network side is over; 52. a battery cell; 53. the flexible-straight transformer is overhead; 54. an emergency tank room; 55. bridge arm alternating current GIS is overhead; 56. preparing a spare room; 57. a fire-fighting equipment room; 61. a helicopter platform.

Detailed Description

In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 3, a compact and lightweight offshore flexible direct current converter station comprises three parts, namely a foundation pile, a jacket and an upper module. The upper module comprises a first layer of conversion platform 1, a second layer of conversion platform 2, a third layer of conversion platform 3, a fourth layer of conversion platform 4, a fifth layer of conversion platform 5, a roof layer 6 and other auxiliary equipment which are arranged from bottom to top in sequence.

The converter station upper module is arranged on a jacket at sea by adopting a high-position floating method, and the jacket is arranged on a foundation pile.

Referring to fig. 4, the first layer of converter platform 1 includes a first housing, a flexible dc converter valve 11, a bridge arm dc GIS12, a bridge arm reactance 13, a dc field GIS14, a seawater pump room 15, a valve cooling equipment room 16, and the like. The inner side of the first shell is divided into a converter station valve hall 17, a seawater pump room 15 and a valve cooling equipment room 16; the flexible direct-current converter valve 11, the bridge arm direct-current GIS12, the bridge arm reactance 13 and the direct-current field GIS14 are all arranged in a converter station valve hall 17, and the seawater pump room 15 and the valve cooling equipment room 16 are located on the same side of the valve hall 17.

Main wiring in the converter station valve hall 17 is laid in an overhead mode by adopting multi-split aluminum stranded wires, and other main wiring is laid by adopting high-voltage cables through a trench.

The flexible direct current converter valve 11 comprises 6 bridge arms in total, each bridge arm comprises 1 to 3 supporting flexible straight valve towers or 3 to 6 suspension type flexible straight valve towers, and the supporting flexible straight valve towers or the suspension type flexible straight valve towers are arranged according to the phase sequence of the A phase, the B phase, the C phase, the B phase and the A phase.

The bridge arm direct current side light CT, the lightning arrester, the grounding switch and other equipment are all in a gas insulated metal enclosed type combined electrical apparatus (GIS) form to form a bridge arm direct current GIS 12.

The direct current field light CT, the grounding switch, the isolating switch, the lightning arrester and other equipment adopt a gas insulated metal enclosed type combined electrical apparatus (GIS) to form a direct current field GIS 14.

The bridge arm reactance 13 is arranged according to the phase sequence of A phase-B phase-C phase-B phase-A phase according to the arrangement of the converter valves in the valve hall. In addition, dry air core reactors are used as the arm reactors 13.

Referring to fig. 5, the second layer of converter platform 2 includes a second housing, the second housing is divided into a first valve hall overhead 21 and a compartment 22, and the compartment 22 is divided into a valve hall heating and ventilating machine room, a seawater desalination room, a fresh air machine room, a heating and ventilating machine room, and the like.

Referring to fig. 6, the third stage of the converter platform 3 includes a third housing, which is divided into a second valve hall upper space 31 and a secondary equipment room 32, etc., and the secondary equipment room 32 is disposed right above the compartment 22. The secondary equipment room 32 includes a converter station control room, a converter valve control room, a control center, and the like.

Referring to fig. 7, the fourth layer of converter platform 4 includes a bottom plate, a fourth housing, a diesel room 44, a bridge arm ac GIS45, a valve side GIS46, a grid side GIS41, a flexible direct transformer 42, a station transformer 43, and the like, and is internally partitioned into a first compartment 47, a second compartment 48, a third compartment 49, a fourth compartment 410, and a fifth compartment 411.

Grid-side GIS41 are arranged in a single first compartment 47, two flexible-to-direct transformers 42 are arranged in a second compartment 48 and a third compartment 49, respectively, two station transformers 43 are arranged in a fourth compartment 410 and a fifth compartment 411, respectively, and both bridge arm ac GIS45 and valve-side GIS46 are arranged in a sixth compartment 412.

The grid side CT, the lightning arrester, the grounding switch, the isolating switch, the bus, the circuit breaker, the voltage transformer and other equipment all adopt a gas insulated metal enclosed type combined electrical apparatus type (GIS) to form a grid side GIS 41.

The flexible-direct transformer 42 selects 2 three-phase transformers to reduce the occupied area and the manufacturing cost, and the capacity of each transformer is designed according to 70% -80% of the transmission capacity. To ensure that the commutation platforms are stressed evenly, a flexible-to-straight transformer 42 is disposed in the middle of the platforms.

The bridge arm alternating current side light CT, the lightning arrester, the grounding switch and other equipment are in a gas insulated metal enclosed type combined electrical apparatus (GIS) type to form a bridge arm alternating current GIS 45.

The valve side bus, the optical CT, the lightning arrester, the circuit breaker, the grounding switch, the isolating switch, the voltage transformer and other equipment all adopt a gas insulated metal enclosed type combined electrical apparatus type (GIS) to form a valve side GIS 46.

Referring to fig. 8, the fifth layer of converter platform 5 includes a fifth housing, and the fifth housing is internally divided into a grid-side GIS overhead 51, a battery chamber 52, a flexible-direct-current transformer overhead 53, an emergency oil tank chamber 54, a bridge arm ac GIS overhead 55, a spare part room 56, a fire-fighting equipment room 57, and the like.

Referring to fig. 9, the roof layer 6 includes a heliplatform 61, equipment hoist manholes, cranes, and the like.

The wiring sequence of the converter station electric system is as follows: the converter station alternating current incoming line → the network side GIS41 → the flexible direct transformer 42 → the valve side GIS46 → the bridge arm alternating current GIS45 → the flexible direct current converter valve 11 → the bridge arm direct current GIS12 → the bridge arm reactance 13 → the direct current field GIS14 → the converter station direct current outgoing line.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims

1. The compact and light marine flexible direct-current converter station is characterized by comprising an upper module arranged on a jacket, wherein a (1) th layer of converter platform is arranged in the upper module, the first layer of converter platform (1) comprises a flexible direct-current converter valve (11), a bridge arm reactance (13), bridge arm direct-current side equipment and direct-current field equipment, and a flexible direct-current transformer (42), a station transformer (43), network side equipment, bridge arm alternating-current side equipment and valve side equipment are arranged above the first layer of converter platform (1);

the bridge arm direct current side equipment comprises a direct current side light CT, a lightning arrester and a grounding switch, and the direct current side light CT, the lightning arrester and the grounding switch are in a gas insulated metal enclosed type combined electrical apparatus type to form a bridge arm direct current GIS (12);

the direct current field equipment comprises a direct current field optical CT, a grounding switch, an isolating switch and a lightning arrester, wherein the direct current field optical CT, the grounding switch, the isolating switch and the lightning arrester are all in a gas insulated metal enclosed type combined electrical apparatus type, and a direct current field GIS (14) is formed.

2. A compact and lightweight flexible dc converter station at sea according to claim 1, wherein said grid side equipment comprises a grid side CT, a lightning arrester, a grounding switch, a disconnecting switch, a bus bar, a circuit breaker and a voltage transformer, all of which are in the form of gas insulated metal enclosed switchgear, constituting a grid side GIS (41);

the bridge arm alternating current side equipment comprises a bridge arm alternating current side light CT, a lightning arrester and a grounding switch, wherein the bridge arm alternating current side light CT, the lightning arrester and the grounding switch are all in a gas insulated metal closed type combined electrical apparatus type to form a bridge arm alternating current GIS (45);

the valve side equipment comprises a valve side bus, an optical CT, a lightning arrester, a circuit breaker, a grounding switch, a disconnecting switch and a voltage transformer, wherein the valve side bus, the optical CT, the lightning arrester, the circuit breaker, the grounding switch, the disconnecting switch and the voltage transformer are all in a gas insulated metal enclosed type combined electrical apparatus type, and a valve side GIS (46) is formed.

3. A compact and lightweight offshore flexible dc converter station according to claim 2, characterized in that said grid-side GIS (41) is arranged in a first compartment (47), two flexible dc transformers (42) are arranged in a second compartment (48) and a third compartment (49), respectively, two station transformers (43) are arranged in a fourth compartment (410) and a fifth compartment (411), respectively, and both bridge arm ac GIS (45) and valve-side GIS (46) are arranged in a sixth compartment (412).

4. The compact and lightweight offshore flexible direct current converter station according to claim 1, wherein the flexible direct current converter valve (11), the bridge arm direct current GIS (12), the bridge arm reactance (13) and the direct current field GIS (14) are all arranged in a converter station valve hall (17), and main connections in the converter station valve hall (17) are all laid in an overhead manner by multi-split aluminum stranded wires.

5. A compact, lightweight offshore flexible dc converter station according to claim 1, characterized in that said flexible dc converter valves (11) have six legs, each leg comprising one to three supporting flexible straight valve towers or three to six suspended flexible straight valve towers, arranged in a phase sequence of a-phase-B-phase-C-phase-B-phase-a-phase.

6. A compact, lightweight offshore flexible dc converter station according to claim 1, characterized in that the converter station electrical system wiring is: an alternating current inlet wire of the converter station is connected with a network side GIS (41) inlet wire end, an outlet wire of the network side GIS (41) is connected with a network side port of a flexible direct current transformer (42), a valve side port of the flexible direct current transformer (42) is connected with a valve side GIS (46) inlet wire end, an outlet wire of the valve side GIS (46) is connected with an inlet wire end of a bridge arm alternating current GIS (45), an outlet wire of the bridge arm alternating current GIS (45) is connected with an alternating current side port of a flexible direct current converter valve (11), a direct current side port of the flexible direct current converter valve (11) is connected with an inlet wire end of a bridge arm direct current GIS (12), an outlet wire of the bridge arm direct current GIS (12) is connected with an inlet wire end of a bridge arm reactance (13), an outlet wire end of a bridge arm reactance (13) is connected with an inlet wire end of a direct current GIS (14), and an outlet wire end of the direct current field GIS (14) is connected with a direct current outlet wire of the converter station.

7. A compact, lightweight offshore flexible dc converter station according to claim 1, characterized in that said bridge arm reactances (13) are arranged in a phase sequence of a-phase-B-phase-C-phase-B-phase-a according to the arrangement of converter valves in a valve hall.

8. A compact, lightweight offshore flexible dc converter station according to claim 1, characterized in that said flexible dc transformer (42) consists of two three-phase transformers.

9. A compact, lightweight offshore flexible dc converter station according to claim 8, characterized in that said flexible dc transformer (42) is arranged in a middle position of the platform.

10. A compact, lightweight offshore flexible dc converter station according to claim 1, characterized in that said upper module is mounted offshore on the jacket by an elevated float-over method.