CN214626382U

CN214626382U - Direct current field arrangement structure of offshore flexible direct current converter station

Info

Publication number: CN214626382U
Application number: CN202120431028.6U
Authority: CN
Inventors: 陈鹏; 黄玲; 马亮; 周国梁; 杨金根; 梁言桥; 肖睿; 曾维雯; 陈宝平; 丁勇杰
Original assignee: China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Current assignee: China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-11-05
Anticipated expiration: 2031-02-25

Abstract

The utility model relates to a flexible direct current transmission engineering technical field of offshore wind power, a flexible direct current converter station direct current field arrangement structure on sea is disclosed, including the direct current field, the quantity in direct current field is two, two direct current field symmetrical arrangement, be equipped with anodal three-phase bridge arm reactor in a direct current field, be equipped with negative pole three-phase bridge arm reactor in another direct current field, and six bridge arm reactors in two direct current fields are "ABCCBA" symmetrical arrangement, the inlet wire of every bridge arm reactor all links has direct current wall bushing, it all links the line with collecting pipe type generating line and connecting wire to go out, the collecting pipe type generating line links in proper order through connecting conductor has direct current voltage measuring device, direct current isolator and arrester, finally be connected with the direct current submarine cable through direct current submarine cable terminal. The utility model discloses flexible direct current converter station direct current field arrangement structure on sea can reduce the size in direct current field, satisfies the compactification of flexible direct current converter station on sea and arranges the requirement.

Description

Direct current field arrangement structure of offshore flexible direct current converter station

Technical Field

The utility model relates to a flexible direct current transmission of electricity engineering technical field of marine wind power, concretely relates to marine flexible direct current converter station direct current field arrangement structure.

Background

In recent years, as offshore wind power resources are increasingly tense, offshore flexible direct current transmission technology is greatly developed, and offshore flexible direct current transmission projects adopting symmetrical monopole (pseudo dipole) wiring are widely applied in europe.

The direct current field electrical equipment is an important component of an offshore flexible direct current transmission system, and in the prior art, a technical scheme that a bridge arm reactor is arranged on an alternating current side of a converter valve and a direct current reactor is arranged on a direct current pole line is generally adopted in a onshore flexible direct current converter station, and the arrangement of the bridge arm reactor, a direct current pole line loop and the arrangement of the direct current reactor need to be considered at the same time.

Different from the onshore flexible direct current converter station, the electrical equipment arrangement of the offshore flexible direct current converter station needs to be designed in combination with the totally closed, compact, light and stacked arrangement requirements of the offshore flexible direct current converter station in consideration of the special operating environment of the electrical equipment of the offshore flexible direct current converter station and the limitation requirements of the offshore flexible direct current converter station on the space size and the overall weight. Therefore, in the offshore flexible direct current converter station, a bridge arm reactor is usually considered to be arranged on the direct current side of the converter valve, and the direct current reactor is eliminated, so that the purpose of reducing the size of the offshore flexible direct current converter station is achieved.

However, due to the large size and heavy weight of the bridge arm reactors, the bridge arm reactors are arranged on the direct current side of the converter valves, which will affect the overall platform arrangement of the offshore flexible direct current converter station to a certain extent. At present, the research and development and design experience of an offshore flexible direct current converter station in China is not mature, particularly, related research work is less carried out on the arrangement of electrical equipment of a direct current field of the offshore flexible direct current converter station, and how to provide a reasonable arrangement structure of the electrical equipment of the direct current field of the offshore flexible direct current converter station is a problem to be solved urgently at the present stage.

Disclosure of Invention

The utility model aims at providing a marine flexible direct current converter station direct current field arrangement structure to the not enough of above-mentioned technique, can reduce the size in direct current field, satisfy marine flexible direct current converter station compactification and arrange the requirement.

In order to achieve the above purpose, the utility model relates to a marine flexible direct current converter station direct current field arrangement structure, which comprises a direct current field, the number of the direct current field is two, two direct current fields are symmetrically arranged, one direct current field is provided with a positive pole A phase bridge arm reactor, a positive pole B phase bridge arm reactor and a positive pole C phase bridge arm reactor, the other direct current field is provided with a negative pole A phase bridge arm reactor, a negative pole B phase bridge arm reactor and a negative pole C phase bridge arm reactor, six bridge arm reactors in the two direct current fields are symmetrically arranged in an ABCCBA manner, the inlet wire of the bridge arm reactor in each direct current field is connected with a direct current wall bushing, the outlet wire is connected with a bus-pipe type bus-bar in parallel, the bus-pipe type bus-bar is connected with a direct current voltage measuring device, a direct current isolating switch and a lightning arrester in sequence through a connecting conductor, and finally, the direct current submarine cable is connected with the direct current submarine cable through a direct current submarine cable terminal.

Preferably, both ends of the direct current measuring device are supported and fixed through post insulators.

Preferably, the bus-pipe type bus is hung at the indoor top of the direct current field through a suspension insulator.

Preferably, the dc voltage measuring device is located directly below the bus-pipe type bus bar.

Preferably, the direct current wall bushing, the bridge arm reactor, the direct current voltage measuring device, the direct current measuring device, the lightning arrester and the direct current submarine cable terminal are all installed on the ground of the direct current field.

Preferably, a direct current isolating switch is arranged on the connecting conductor, and the direct current isolating switch is installed on the ground of the direct current field.

Compared with the prior art, the utility model, have following advantage:

1. the direct-current side outlet of the bus arm reactor is converged in a manner of hoisting the bus-pipe type bus, so that the size of a direct-current field in the length direction can be reduced, and the requirement on compact arrangement of an offshore flexible direct-current converter station is met;

2. the direct-current voltage measuring device is arranged below the bus-pipe type bus, so that the size of the direct-current field in the width direction can be reduced, and the requirement of compact arrangement of the offshore flexible direct-current converter station is met;

3. the minimum size of the arrangement of the direct-current field electrical equipment meets the requirements of the antimagnetic range of the bridge arm reactor besides the live distance of the power distribution device, and the safe operation of the equipment around the bridge arm reactor is ensured.

Drawings

Fig. 1 is the electrical schematic diagram of the dc field arrangement structure of the flexible dc converter station on the sea.

The components in the figures are numbered as follows:

the direct current type three-phase bridge-arm reactor comprises a direct current field 1, a positive pole A-phase bridge-arm reactor 2, a positive pole B-phase bridge-arm reactor 3, a positive pole C-phase bridge-arm reactor 4, a negative pole A-phase bridge-arm reactor 5, a negative pole C-phase bridge-arm reactor 7, a direct current wall bushing 8, a bus pipe type bus 9, a connecting conductor 10, a direct current voltage measuring device 11, a direct current measuring device 12, a lightning arrester 13, a direct current submarine cable terminal 14, a post insulator 15, a suspension insulator 16 and a direct current isolating switch 17.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments.

As shown in fig. 1, the marine flexible dc converter station dc field layout structure of the present invention comprises two dc fields 1, the number of the dc fields 1 is two, the two dc fields 1 are symmetrically arranged, one dc field 1 is provided with an anode a-phase bridge arm reactor 2, an anode B-phase bridge arm reactor 3 and an anode C-phase bridge arm reactor 4, the other dc field 1 is provided with a cathode a-phase bridge arm reactor 5, a cathode B-phase bridge arm reactor 6 and a cathode C-phase bridge arm reactor 7, and six bridge arm reactors in the two dc fields 1 are symmetrically arranged in an ABCCBA manner, an incoming line of each bridge arm reactor is connected with a dc wall bushing 8, an outgoing line is connected in parallel with a bus bar type bus bar 9, the bus bar type bus bar 9 is connected in sequence with a dc voltage measuring device 11, a dc current measuring device 12, a dc isolating switch 17 and a lightning arrester 13 through a connecting conductor 10, and finally connected with the direct current submarine cable through the direct current submarine cable terminal 14.

The two ends of the direct current measuring device 12 are supported and fixed by post insulators 15, and the direct voltage measuring device 11 is positioned right below the bus-bar type bus 9.

In this embodiment, the bus-bar type bus 9 is suspended at the indoor top of the dc field 1 through a suspension insulator 16, and the dc wall bushing 8, the bridge arm reactor, the dc voltage measuring device 11, the dc current measuring device 12, the lightning arrester 13, and the dc submarine cable terminal 14 are all installed on the ground of the dc field 1.

In addition, a direct current isolation switch 17 is arranged on the connecting conductor 10, and the direct current isolation switch 17 is installed on the ground of the direct current field 1.

In this embodiment, the working current flowing through the bridge arm reactor contains a large power frequency ac component and a double frequency component, and a large induced alternating magnetic field is generated in the surrounding space. Due to electromagnetic induction, an electric current is induced in a nearby metal material, and joule heat loss is accompanied, resulting in a problem of heat generation of the metal material. Therefore, the magnetically permeable material cannot be arranged in a certain range around the bridge arm reactor, and this range is referred to as a antimagnetic range. The long-term heating of the magnetic conductive material greatly affects the safe operation of equipment, the mechanical performance and the service life of the structure, and the active loss of the bridge arm reactor can be increased. The minimum arrangement size of the direct current field meets the requirements of the antimagnetic range besides the electrified distance of the power distribution device, and ensures the safe operation of equipment around the bridge arm reactor.

The utility model discloses marine flexible direct current converter station direct current field arrangement structure and size calculation method thereof, through the mode of hoisting the bus-pipe type bus 9 converge the line of bridge arm reactor direct current side, can reduce direct current field 1 length direction size, satisfy the requirement of marine flexible direct current converter station compactification arrangement; the direct-current voltage measuring device 11 is arranged below the bus-pipe type bus 9, so that the size of the direct-current field 1 in the width direction can be reduced, and the requirement of compact arrangement of the offshore flexible direct-current converter station is met; the minimum size of the arrangement of the direct current field electrical equipment meets the requirements of the antimagnetic range of the bridge arm reactor besides the live distance of the power distribution device, and ensures the safe operation of the equipment around the bridge arm reactor and the mechanical performance and the service life of the metal structural part.

Claims

1. The utility model provides an offshore flexible direct current converter station direct current field arrangement structure, includes direct current field (1), its characterized in that: the direct current field (1) is two, two direct current fields (1) are symmetrically arranged, one direct current field (1) is internally provided with a positive pole A-phase bridge arm reactor (2), a positive pole B-phase bridge arm reactor (3) and a positive pole C-phase bridge arm reactor (4), the other direct current field (1) is internally provided with a negative pole A-phase bridge arm reactor (5), a negative pole B-phase bridge arm reactor (6) and a negative pole C-phase bridge arm reactor (7), six bridge arm reactors in the two direct current fields (1) are symmetrically arranged in an ABCCBA manner, an inlet wire of each bridge arm reactor is connected with a direct current wall bushing (8), an outlet wire of each bridge arm reactor is connected with a bus-bar type bus (9) in parallel, the bus-bar type bus (9) is sequentially connected with a direct current voltage measuring device (11), a direct current measuring device (12), a direct current isolating switch (17) and a lightning arrester (13) through a connecting conductor (10), finally, the direct current submarine cable is connected with the direct current submarine cable through a direct current submarine cable terminal (14).

2. The offshore flexible direct current converter station direct current field arrangement structure of claim 1, wherein: and two ends of the direct current measuring device (12) are supported and fixed through post insulators (15).

3. The offshore flexible direct current converter station direct current field arrangement structure of claim 1, wherein: the bus-bar type bus (9) is hung at the indoor top of the direct current field (1) through a suspension insulator (16).

4. The offshore flexible direct current converter station direct current field arrangement structure of claim 3, wherein: the direct-current voltage measuring device (11) is located right below the bus-pipe type bus (9).

5. The offshore flexible direct current converter station direct current field arrangement structure of claim 4, wherein: the direct-current wall bushing (8), the bridge arm reactors, the direct-current voltage measuring device (11), the direct-current measuring device (12), the lightning arrester (13) and the direct-current submarine cable terminal (14) are all installed on the ground of the direct-current field (1).

6. The offshore flexible direct current converter station direct current field arrangement structure of claim 5, wherein: and a direct current isolating switch (17) is arranged on the connecting conductor (10), and the direct current isolating switch (17) is installed on the ground of the direct current field (1).