CN221042672U - But modularization marine current conversion station of dilatation - Google Patents

Abstract

The invention discloses a modularized offshore converter station capable of expanding capacity, which is characterized by comprising the following components: the device comprises a jacket (1), a platform structure (2), a module base (3), a module guide pile (4) and a converter module (5), wherein the converter module (5) is provided with a module body (51), a hoisting eye plate (52), a module guide groove (53) and a door (54); 4 hoisting eye plates (52) are arranged at the top of each converter module (5). Compared with the prior art, the invention has the advantages that: in the process that the converter modules are hoisted to the platform structure, the axle centers of the semicircular parts of the guide grooves of the converter modules are aligned with the axle centers of the module guide piles, so that the guide effect is achieved, the converter modules can be installed according to the quantity of fans actually installed in the wind power plant due to the modularized arrangement, the converter modules with corresponding capacity can be installed during capacity expansion of the wind power plant in the later period, new converter stations are not required to be built, the capacity expansion efficiency of the expandable modularized offshore converter stations is improved, and the capacity expansion time is greatly shortened.

Description

But modularization marine current conversion station of dilatation

Technical Field

The invention relates to an offshore converter station, in particular to a modular offshore converter station with expandable capacity.

Background

In recent years, the coastal wind power industry in China is rapidly developed, and gradually develops towards a larger scale and a longer distance.

When offshore distances of offshore wind farms exceed 60km, the cost of ac transmission modes of conventional submarine cables increases dramatically, and at this time, modes of dc transmission suitable for large-capacity, long-distance power transmission should be considered. Offshore converter stations have been developed at this time as the best option to solve this problem. An offshore converter station is a device that collects electrical energy from an offshore wind farm with ac lines and then converts the collected electrical energy into dc output.

However, with the gradual saturation of the applicable wind power plant along the coast, the expansion is performed on the basis of the original wind power plant, so that the wind power plant becomes a new wind power development point.

For the generated energy of the expansion of the existing wind power plant, the original converter station is obviously incapable of processing. And the newly-built converter station of the generated energy specially for capacity expansion has the advantages of high cost, long construction period and large construction quantity. The best way is to upgrade the capacity on the basis of the original converter station.

However, at present, the existing converter stations in China do not have upgrading capability, and related patents of the existing modularized converter stations, namely a modularized offshore converter station structure of CN110137838A and a modularized offshore flexible direct current transmission system converter station of CN111799661B, only divide the converter stations into modules according to functions, are convenient to manufacture and install, and do not have the capability of post capacity expansion, upgrading and transformation.

Disclosure of Invention

The invention provides a modularized offshore converter station capable of expanding capacity in order to effectively solve the technical problems of complex structure, long expansion time and low expansion efficiency of the converter station in the prior art that the capacity of the converter station is expanded in the later stage, upgrading and reforming capacity is not realized,

Comprising the following steps: the device comprises a jacket, a platform structure, a module base, a module guide pile and a converter module;

The jacket is of a pipe support structure and is formed by welding steel pipes; the platform structure is fixedly arranged at the top of the jacket;

The platform structure is a box-type plate frame structure, a railing and a channel are arranged on the platform structure, the railing is arranged on the outermost ring of the platform structure around the upper surface of the platform structure, the channel is close to the railing around the upper surface of the platform structure, and the channel is arranged in a ring formed by the railing;

The inside box-shaped plate frame structure of platform structure is provided with: cable entry protection tube, cable exit protection tube, platform structure upper surface welding is provided with: the module base and the module guide pile are arranged on the upper surface of the platform structure in a detachable manner;

The module base is of a box-shaped structure, and the top of the module base is provided with an inclined plane;

Submarine cables of fans in the offshore wind farm enter the converter module through a cable inlet protection pipe, and electric energy generated by the fans is transmitted into the converter module for processing;

The converter module is provided with a module body, a hoisting eye plate, a module guide groove and a door; 4 hoisting eye plates are arranged at the top of each converter module; six module guide grooves are distributed on two sides of the converter module; the module guide groove includes: a semicircular portion and a flat portion; each converter module is provided with two doors which are respectively arranged at two ends of the converter module; the module body is steel box, and the module body is high: 10m-30m, length is: 50m-150m, width is: 10m-40m, weight is: 500 tons to 4000 tons;

The module guide pile is a circular pipe, the radius of the module guide pile is r, the module guide pile is matched with the module guide groove, and the axis of the semicircular part of the guide groove of the converter module is aligned with the axis of the module guide pile in the process of hoisting the converter module to the platform structure, so that the module guide pile plays a role in guiding, and the converter module is accurately positioned on the platform structure;

The module body is divided into 4 layers, the first layer of the module body is a double-layer bottom structure with the layer height of 1m-3m, the double-layer bottom structure is respectively used as a pipeline and a cable channel, and a cable inlet protection pipe interface and a cable outlet protection pipe interface are arranged at two ends of the double-layer bottom structure;

The second layer of the module body includes: the wind field electric energy inlet, the first transformer chamber, the converter chamber and the second transformer chamber; wherein: the wind field electric energy inlet is connected with the first transformer chamber and is arranged at one end of the double-layer bottom structure (511), and the second transformer chamber is arranged at the other end of the double-layer bottom structure (511);

the converter chamber is arranged between the first transformer chamber and the second transformer chamber on the double-layer bottom structure;

The third layer of the module body includes: distribution room, sea water promote and treatment room, wherein: the distribution room is arranged at the top of the wind field electric energy inlet and the first transformer room; the seawater lifting and treating chamber is arranged at the top of the second transformer chamber;

The fourth layer of the module body includes: control room, ventilation and air conditioning room, wherein: the ventilation and air conditioning room is arranged at the top of the seawater lifting and treating room, and the control room is arranged at the top of the distribution room.

The above-mentioned expandable modular offshore converter station, further: the jacket props the platform structure apart from the sea surface distance for H meters, wherein: h=ha+hb+hc, where: ha is the extremely high water level in century, hb is the maximum wave height in century, hc is the rest, and Hc is 1-2 m.

The above-mentioned expandable modular offshore converter station, further: the upper surface of the platform structure is brushed with paint with the functions of reflecting light and preventing skid.

The above-mentioned expandable modular offshore converter station, further: the inner diameter of the cable inlet protection tube is as follows: 500mm-1000mm; the number of cable inlet protection tubes is determined according to the commutation capacity of the commutation module.

The above-mentioned expandable modular offshore converter station, further: the inner diameter of the cable outlet protection tube is as follows: 800mm-1600mm; the cable outlet protection tube is determined according to the commutation capacity of the commutation module.

The above-mentioned expandable modular offshore converter station, further: the starting point height C of the inclined plane at the top of the module base is: 25% -30% of the height of the converter module; the width D of the inclined plane is as follows: the difference between the radius R of the semicircular part of the converter module guide groove and the radius R of the module guide pile is 2-3 times, and the inclined plane inclination angle alpha is 30-40 degrees.

The above-mentioned expandable modular offshore converter station, further: the radius R of the semicircular part of the module guiding groove, the length R of the straight part of the semicircular part and the radius R of the module guiding pile, wherein: 2R > R > 1.6R.

The above-mentioned expandable modular offshore converter station, further: the wind field electric energy inlet is connected with the fan through a submarine cable, electric energy generated by the fan enters the first transformer chamber after primary rectification is carried out on the wind field electric energy inlet, the first transformer chamber is used for converting alternating current into direct current through the converter chamber after boosting treatment, the direct current output from the converter chamber is subjected to boosting treatment through the second transformer chamber, and the boosted direct current is transmitted to the shore through the cable.

The above-mentioned expandable modular offshore converter station, further: the control room is internally provided with: a monitoring station and a control station.

The above-mentioned expandable modular offshore converter station, further: the seawater lifting and treating chamber has the functions that: after the seawater is sucked, one part of the seawater is used for cooling equipment of the converter module, and the other part of seawater is stored as fire fighting water for fire fighting; the ventilation and air conditioning chamber is used for ventilating and adjusting the temperature of the converter module.

Compared with the prior art, the invention has the advantages that:

(1) The invention relates to a modular offshore converter station for module division according to functions, comprising: the converter comprises a jacket, a platform structure, a module base, module guide piles and converter modules, wherein the converter modules have high integration and independence, each converter module can independently complete converter operation, and due to the modularized arrangement, the converter modules can be installed according to the quantity of actually installed fans, so that new converter stations do not need to be built, and the cost is saved by 20% -30%.

(2) In the modularized offshore converter station, the semicircular axle centers of the guide grooves of the converter modules are aligned with the axle centers of the guide piles of the modules in the process that the converter modules are hoisted to the platform structure, so that the converter modules are accurately positioned on the platform structure, the capacity expansion efficiency of the modularized offshore converter station capable of expanding capacity is improved, the capacity expansion time is greatly shortened, the capacity expansion working efficiency is improved, and the capacity expansion time is shortened by 10% -20%.

(3) The invention relates to a modularized offshore converter station, a module body is divided into 4 layers, a first layer of the module body is of a double-layer bottom structure, and a second layer of the module body comprises: the wind field electric energy inlet, the first transformer chamber, the converter chamber and the second transformer chamber; wherein: the wind field electric energy inlet is connected with the first transformer chamber and is arranged at one end of the double-layer bottom structure, and the second transformer chamber is arranged at the other end of the double-layer bottom structure; the converter chamber is arranged between the first transformer chamber and the second transformer chamber on the double-layer bottom structure; the third layer of the module body includes: distribution room, sea water promote and treatment room, wherein: the distribution room is arranged at the top of the wind field electric energy inlet and the first transformer room; the seawater lifting and treating chamber is arranged at the top of the second transformer chamber; the fourth layer of the module body includes: control room, ventilation and air conditioning room, wherein: the ventilation and air conditioning room is arranged at the top of the seawater lifting and treating room, and the control room is arranged at the top of the distribution room. The module body has compact structure, reduces the use amount of structural components, lightens the weight by 5-15%, reduces the construction cost and improves the safety of the modularized offshore converter station.

Drawings

Fig. 1 is a front view of a schematic diagram of a scalable modular marine converter station of the present invention;

figure 2 is a left side view of a schematic of a modular expandable offshore converter station of the present invention;

Figure 3 is a top view of a schematic diagram of a modular expandable offshore converter station of the present invention;

Fig. 4 is a partial enlarged view of the top view of a modular expandable offshore converter station of the invention, in the direction D, of the module guide recess and module guide stake fitting schematic;

Fig. 5 is a front view of a module base of a scalable modular offshore converter station of the present invention;

Figure 6 is a top view of a module base of a scalable modular offshore converter station of the present invention;

Fig. 7 is a front view of a schematic of a converter module of a scalable modular offshore converter station of the present invention;

Fig. 8 is a top view of a schematic of a converter module of a scalable modular offshore converter station of the present invention;

Fig. 9 is a front view of a schematic base of a bottom contact module of a converter module in a process of hoisting the converter module of a modular expandable offshore converter station according to the present invention;

Fig. 10 is an enlarged view in the M-direction of a front view of a schematic base of a bottom contact module of a converter module during hoisting of the converter module in a modular expandable offshore converter station according to the invention.

Wherein: the method comprises the steps of 1, 2, a jacket, 21, 22, a channel, 23, a cable inlet protection pipe, 24, a cable outlet protection pipe, 25, a converter module placement position, 3, a module base, 31, 4, 5, a converter module, 51, 52, a lifting eye plate, 53, a module guide groove, A, B, sea surface, H, a minimum distance between the bottom of the platform structure and the sea surface, C, a starting point height of the inclined surface of the module base, D, an inclined surface width of the module base, alpha, an inclined surface inclination angle of the module base, R, a radius of the module guide pile, R, a radius of the guide groove of the converter module and E, and a lifting steel wire rope.

Detailed Description

PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION

A scalable modular marine converter station, comprising: jacket 1, platform structure 2, module base 3, module guide pile 4 and current conversion module 5;

The jacket 1 is of a pipe rack structure and is formed by welding steel pipes; the platform structure 2 is fixedly arranged at the top of the jacket 1;

The platform structure 2 is a box-type plate frame structure, the platform structure 2 is provided with a railing 21 and a channel 22, the railing 21 is arranged on the outermost ring of the platform structure 2 around the upper surface of the platform structure, the channel 22 is close to the railing 21 around the upper surface of the platform structure, and the channel 22 is arranged in a ring surrounded by the railing 21; the railing 21 meets the requirements of the load line convention, and the clear height is not less than 1 meter.

The inside box-shaped plate frame structure of platform structure 2 is provided with: the cable entry protection tube 23, cable exit protection tube 24, platform structure 2 upper surface welding is provided with: the module base 3 and the module guide piles 4, and the converter module 5 is detachably arranged on the upper surface of the platform structure 2;

The module base 3 is of a box-shaped structure, and the top of the module base is provided with an inclined plane 31;

Submarine cables of fans in the offshore wind farm enter the converter module 5 through the cable inlet protection pipe 23, and electric energy generated by the fans is transmitted into the converter module 5 for processing;

The converter module 5 is provided with a module body 51, a lifting eye plate 52, a module guide groove 53 and a door 54; 4 hoisting eye plates 52 are arranged at the top of each converter module 5; six module guide grooves 53 are distributed on two sides of the converter module 5; the module guide groove 53 includes: a semicircular portion and a flat portion; each converter module 5 is provided with two gates 54 which are respectively arranged at two ends of the converter module 5; the module body 51 is a steel box body, and the height of the module body 51 is: 10m-30m, length is: 50m-150m, width is: 10m-40m, weight is: 500 tons to 4000 tons; the size of the module body 51 is limited by two factors: firstly, the module body 51 can independently complete the commutation operation, and the commutation module 5 is required to be provided with all relevant equipment and supporting facilities for completing the commutation operation, so that the module body 51 needs enough space for equipment arrangement and cannot be too small; secondly, the module body 51 cannot be oversized, which would result in a large weight of the module body, and cannot be hoisted at sea, and in this embodiment, the module body is 18.5 meters high, 94 meters long, 23 meters wide, and about 2000 tons in weight.

The module guide pile 4 is a circular tube with the radius r and is matched with the module guide groove 53, and in the process of hoisting the converter module 5 to the platform structure 2, the axis of the semicircular part of the guide groove 53 of the converter module 5 is aligned with the axis of the module guide pile 4, so that the module guide pile has a guiding function, and the converter module 5 is accurately positioned on the platform structure 2;

The module body 51 is divided into 4 layers, the first layer of the module body 51 is a double-layer bottom structure 511 with the layer height of 1m-3m, the double-layer bottom structure 511 is respectively used as a pipeline and a cable passage, and a cable inlet protection pipe interface 5111 and a cable outlet protection pipe interface 5112 are arranged at two ends of the double-layer bottom structure 511;

The second layer of the module body 51 includes: a wind farm electrical energy inlet 512, a first transformer room 513, a commutation room 514, a second transformer room 515; wherein: the wind field electric energy inlet 512 is connected with the first transformer chamber 513, and is arranged at one end of the double-layer bottom structure 511, and the second transformer chamber 515 is arranged at the other end of the double-layer bottom structure 511;

the commutation cell 514 is arranged between the first transformer cell 513 and the second transformer cell 515 on the double bottom structure 511;

The third layer of the module body 51 includes: a distribution room 516, a seawater lifting and treatment room 517, wherein: a distribution room 516 is provided on top of the wind farm electrical energy inlet 512 and the first transformer room 513; the seawater lifting and treating chamber 517 is disposed on top of the second transformer chamber 515;

The fourth layer of the module body 51 includes: control room 518, ventilation and air conditioning room 519, wherein: a ventilation and air conditioning chamber 519 is provided on top of the seawater lifting and treatment chamber 517 and a control chamber 518 is provided on top of the distribution chamber 516.

The jacket 1 props the platform structure 2 away from the sea surface by a distance of H meters, wherein: h=ha+hb+hc, where: ha is the extremely high water level in century, hb is the maximum wave height in century, hc is the rest, and Hc is 1-2 m. To ensure that sea waves do not slap the platform structure and thus the safety of the platform structure 2 and other facilities above it.

The upper surface of the platform structure 2 is brushed with paint with light reflection and anti-skid functions.

The inner diameter of the cable inlet protection tube 23 is as follows: 500mm-1000mm; the number of cable inlet protection tubes 23 is determined according to the commutation capacity of the commutation module 5.

The inside diameter of the cable outlet protection tube 24 is: 800mm-1600mm; the cable outlet protection tube 24 is determined on the basis of the commutation capacity of the commutation module 5.

The starting point height C of the inclined surface 31 of the top of the module base 3 is: 25% -30% of the height of the converter module 5; the width D of the inclined plane is as follows: the difference between the radius R of the semicircular part of the module guiding groove 53 and the radius R of the module guiding pile 4 is 2-3 times, and the inclination angle α of the inclined plane is 30 ° -40 °. The inclined plane width D ensures that the converter module 5 does not exceed the range of the inclined plane 31 in the placing process, so that the converter module 5 can slide down the inclined plane 31 to the placing position smoothly. The inclined plane inclination angle alpha is 30-40 degrees, so that the converter module 5 can slide down along the inclined plane 31 under the action of self gravity and cannot stop sliding down due to overlarge friction force.

The radius R of the semicircular part of the module guiding groove 53, the length R of the flat part thereof, and the radius R of the module guiding pile 4, wherein: 2R > R > 1.6R.

The wind field electric energy inlet 512 is connected with a fan through a submarine cable, electric energy generated by the fan enters the first transformer chamber 513 after primary rectification is carried out on the wind field electric energy inlet 512, the electric energy transmitted by the wind field electric energy inlet 512 is subjected to boosting treatment in the first transformer chamber 513, alternating current is converted into direct current through the converter chamber 514, the direct current output from the converter chamber 514 is subjected to boosting treatment in the second transformer chamber 515, and the boosted direct current is transmitted to the shore through a cable.

The control chamber 518 is internally provided with: a monitoring station and a control station.

The seawater lifting and treating chamber 517 has the functions of: after the seawater is sucked, one part is used for cooling equipment of the converter module 5, and the other part is stored as fire water for fire control; the ventilation and air conditioning chamber 519 serves to ventilate and regulate the temperature of the converter module 5.

The capacity-expandable modularized offshore converter station has high integration and independence, each converter module can independently complete the converter operation, and the converter modules can be installed according to the quantity of actually installed fans due to the modularized arrangement, so that new converter stations do not need to be built, and the construction cost is saved. In the process that the converter module 5 is hoisted to the platform structure, the axis of the semicircular part of the guide groove of the converter module is aligned with the axis of the module guide pile, so that the guide function is realized, the converter module is accurately positioned on the platform structure, the capacity expansion efficiency of the expandable modularized offshore converter station is improved, the capacity expansion time is greatly shortened, and the capacity expansion work efficiency is improved; the module body 5 is divided into a 4-layer structure, the structure is compact, the use amount of the structure is reduced, the construction cost is reduced, and meanwhile, the safety of the modularized offshore converter station is improved.

Claims (10)

1. A scalable modular marine converter station, comprising: the device comprises a jacket (1), a platform structure (2), a module base (3), a module guide pile (4) and a converter module (5);

The jacket (1) is of a jacket structure and is formed by welding steel pipes; the platform structure (2) is fixedly arranged at the top of the jacket (1);

The platform structure (2) is a box-type plate frame structure, a railing (21) and a channel (22) are arranged on the platform structure (2), the railing (21) is arranged on the outermost ring of the platform structure (2) around the upper surface of the platform structure, the channel (22) is close to the railing (21) around the upper surface of the platform structure, and the railing (21) is arranged in a ring formed by encircling the railing (21);

The inside box-shaped board frame structure that is provided with of platform structure (2): cable entry protection tube (23), cable exit protection tube (24), platform structure (2) upper surface welding is provided with: the module base (3) and the module guide piles (4) are arranged on the upper surface of the platform structure (2) in a detachable mode, and the current conversion module (5) is arranged on the upper surface of the platform structure (2) in a detachable mode;

The module base (3) is of a box-shaped structure, and the top of the module base is provided with an inclined plane (31);

Submarine cables of fans in the offshore wind farm enter the converter module (5) through a cable inlet protection pipe (23), and electric energy generated by the fans is transmitted into the converter module (5) for processing;

The converter module (5) is provided with a module body (51), a lifting eye plate (52), a module guide groove (53) and a door (54); 4 hoisting eye plates (52) are arranged at the top of each converter module (5); six module guide grooves (53) are distributed on two sides of the converter module (5); the module guide groove (53) includes: a semicircular portion and a flat portion; each converter module (5) is provided with two doors (54) which are respectively arranged at two ends of the converter module (5); the module body (51) is a steel box body, and the height of the module body (51) is as follows: 10m-30m, length is: 50m-150m, width is: 10m-40m, weight is: 500 tons to 4000 tons;

The module guide pile (4) is a circular tube with the radius r and is matched with the module guide groove (53), and in the process that the converter module (5) is hoisted to the platform structure (2), the axis of the semicircular part of the guide groove (53) of the converter module (5) is aligned with the axis of the module guide pile (4), so that the module guide pile plays a role in guiding, and the converter module (5) is accurately positioned on the platform structure (2);

The module body (51) is divided into 4 layers, a first layer of the module body (51) is a double-layer bottom structure (511) with the layer height of 1m-3m, the double-layer bottom structure is respectively used as a pipeline and a cable channel, and a cable inlet protection pipe interface (5111) and a cable outlet protection pipe interface (5112) are arranged at two ends of the double-layer bottom structure (511);

The second layer of the module body (51) comprises: a wind farm electrical energy inlet (512), a first transformer chamber (513), a converter chamber (514), a second transformer chamber (515); wherein: the wind field electric energy inlet (512) is connected with the first transformer chamber (513), is arranged at one end of the double-layer bottom structure (511), and the second transformer chamber (515) is arranged at the other end of the double-layer bottom structure (511);

the converter chamber (514) is arranged between the first transformer chamber (513) and the second transformer chamber (515) on the double-layer bottom structure (511);

The third layer of the module body (51) comprises: a distribution room (516), a seawater lifting and treatment room (517), wherein: the distribution room (516) is arranged at the top of the wind field electric energy inlet (512) and the first transformer room (513); the seawater lifting and treating chamber (517) is arranged at the top of the second transformer chamber (515);

The fourth layer of the module body (51) comprises: a control room (518), a ventilation and air conditioning room (519), wherein: a ventilation and air conditioning chamber (519) is provided on top of the seawater lifting and treatment chamber (517) and a control chamber (518) is provided on top of the distribution chamber (516).

2. A modular expandable offshore converter station in accordance with claim 1, wherein: the jacket (1) props the platform structure (2) away from the sea surface by a distance of H meters, wherein: h=ha+hb+hc, where: ha is the extremely high water level in century, hb is the maximum wave height in century, hc is the rest, and Hc is 1-2 m.

3. A modular expandable offshore converter station in accordance with claim 1, wherein: the upper surface of the platform structure (2) is brushed with paint with the functions of reflecting light and preventing skid.

4. A modular expandable offshore converter station in accordance with claim 1, wherein: the inner diameter of the cable inlet protection tube (23) is as follows: 500mm-1000mm; the number of cable inlet protection tubes (23) is determined according to the commutation capacity of the commutation module (5).

5. A modular expandable offshore converter station according to claim 3, characterized in that: the inner diameter of the cable outlet protection tube (24) is as follows: 800mm-1600mm; the cable outlet protection tube (24) is determined according to the commutation capacity of the commutation module (5).

6. A modular expandable offshore converter station in accordance with claim 5, wherein: the starting point height C of the inclined plane (31) at the top of the module base (3) is: 25% -30% of the height of the converter module (5); the width D of the inclined plane is as follows: the difference between the radius R of the semicircular part of the converter module guide groove (53) and the radius R of the module guide pile (4) is 2-3 times, and the inclined plane inclination angle alpha is 30-40 degrees.

7. A modular expandable offshore converter station in accordance with claim 6, wherein: the radius R of the semicircular part of the module guiding groove (53), the length R of the straight part of the semicircular part and the radius R of the module guiding pile (4), wherein: 2R > R > 1.6R.

8. A modular expandable offshore converter station according to claim 1 or 6, characterized in that: the wind field electric energy inlet (512) is connected with the fan through a submarine cable, electric energy generated by the fan enters the first transformer chamber (513) after primary rectification is carried out on the wind field electric energy inlet (512), the first transformer chamber (513) is used for boosting electric energy transmitted by the wind field electric energy inlet (512), alternating current is converted into direct current through the converter chamber (514) after boosting treatment, direct current output from the converter chamber (514) is subjected to boosting treatment through the second transformer chamber (515), and the boosted direct current is transmitted to the shore through the cable.

9. A modular expandable offshore converter station according to claim 1 or 6, characterized in that: the control room (518) is internally provided with: a monitoring station and a control station.

10. A modular expandable offshore converter station according to claim 1 or 6, characterized in that: the seawater lifting and treatment chamber (517) functions as: after the seawater is sucked, one part of the seawater is used for cooling equipment of the converter module (5), and the other part of the seawater is stored as fire water for fire control; the ventilation and air conditioning chamber (519) serves for ventilation and temperature regulation of the converter module (5).