A light AC offshore booster station with a single main transformer

Abstract

The present invention provides an AC offshore booster station with a lightweight single main transformer, comprising a single main transformer, a gas-insulated switchgear, a 66kV switchgear, a grounding transformer and a station transformer, and a high-voltage reactor. The AC offshore booster station comprises three decks arranged from bottom to top, each deck consisting of a plurality of functional rooms. The single main transformer is arranged in a main transformer room of the AC offshore booster station, the gas-insulated switchgear is arranged in a high-voltage GIS power distribution device room, the high-voltage reactor is arranged in a high-voltage reactor room, and the 66kV switchgear and the grounding transformer and station transformer are both arranged in the 66kV switchgear room. The present invention optimizes electrical wiring to reduce unnecessary electrical equipment, thereby making the spatial layout of the AC offshore booster station compact and lightweight.

Description

Technical Field

[0001] The present invention relates to the field of offshore wind power generation, and in particular to an AC offshore booster station with a light single main transformer. Background Art

[0002] The offshore substation is the heart of the offshore wind farm. It has the function of increasing the voltage level at sea, which can effectively reduce the loss of electricity transmitted from the sea to the onshore power grid.

[0003] In the early days of offshore wind power development in China, most offshore substations were equipped with internal corridors and temporary rest rooms to facilitate personnel monitoring, facilitate equipment operation and maintenance, and ensure adequate distance from live power lines. This also resulted in a significant amount of excess space within each cabin. Furthermore, for safety reasons, domestically produced power equipment typically has a greater insulation margin, resulting in larger cabin spaces.

[0004] However, with the advent of the era of offshore wind power subsidy reduction and grid parity in China, the design of lightweight offshore booster stations has become particularly important from an economic perspective. First, lightweight offshore booster stations are smaller and lighter, which can reduce construction costs and shorten construction time. Second, the lighter the offshore booster station, the more vessels can accommodate it, and the lower the installation costs.

[0005] With the increasing maturity and reliability of domestic AC offshore wind power electrical equipment, and the advancement and optimization of design concepts, it is feasible to reduce the construction cost and construction period of AC offshore substations. Currently, there is no solution for lightweighting AC offshore substations in existing technologies. Summary of the Invention

[0006] In response to the shortcomings of the prior art, the present invention aims to provide a lightweight AC offshore booster station with a single main transformer. By optimizing electrical wiring to reduce unnecessary electrical equipment, the present invention makes the AC offshore booster station more compact and lightweight.

[0007] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0008] A light AC offshore substation with a single main transformer, characterized by comprising a single main transformer, a gas-insulated switchgear, a 66kV switchgear, a grounding transformer and a station transformer, and a high-voltage reactor;

[0009] The AC offshore substation includes three decks arranged from bottom to top, wherein the single main transformer is arranged in the main transformer room of the AC offshore substation, the gas insulated switchgear is arranged in the high-voltage GIS power distribution device room, the high-voltage reactor is arranged in the high-voltage reactor room, and the 66kV switchgear and the grounding transformer and station transformer are both arranged in the 66kV switchgear room;

[0010] The main transformer room is arranged in the middle of the AC offshore substation, the high-voltage GIS power distribution device room and the high-voltage reactor room are arranged side by side on one side of the main transformer room, the high-voltage GIS power distribution device room and the high-voltage reactor room occupy multiple decks in the height direction, and the 66kV switchgear room is arranged on the other side of the main transformer room;

[0011] The main transformer and the gas-insulated switchgear are connected by a line main transformer group connection, the main transformer and the gas-insulated switchgear are connected by a gas-insulated pipeline bus, the high-voltage side of the main transformer is directly grounded, and the high-voltage reactor and the gas-insulated switchgear are connected by a gas-insulated pipeline bus;

[0012] Each 66kV busbar section of the 66kV switchgear is equipped with a grounding transformer and station transformer incoming line cabinet, a main transformer incoming line cabinet and several wind turbine incoming line cabinets. According to the capacity of the wind farm and the number of low-voltage windings of the main transformer, the AC offshore substation is equipped with one or two 66kV busbar sections and adopts single busbar wiring.

[0013] Furthermore: the main transformer or high-voltage reactor is connected to one end of the gas-insulated pipeline busbar, and the other end of the gas-insulated pipeline busbar passes through the bulkhead of the high-voltage GIS distribution device room and is connected to the gas-insulated switchgear.

[0014] Furthermore: a 66kV submarine cable lead-in area is set up under the 66kV switch cabinet room. The 66kV submarine cable passes through the bottom deck of the offshore booster station to the 66kV submarine cable lead-in area, and is led up to the middle-level 66kV switch cabinet room to connect to the 66kV switch cabinet.

[0015] Furthermore: a high-voltage submarine cable vertical leading-in area is opened and arranged directly below the submarine cable incoming line spacing sleeve in the high-voltage GIS power distribution device room. The high-voltage submarine cable passes through the bottom deck of the offshore substation and is vertically led up to the GIS submarine cable incoming line spacing sleeve in the middle-level high-voltage GIS power distribution device room. The high-voltage submarine cable is fixed on the bottom deck by an anchoring device, and the high-voltage submarine cable has no turning path section in the AC offshore substation.

[0016] Furthermore: a communication relay room is set on the top deck of the AC offshore substation. The communication relay room and the 66kV switchgear room are set on the same side of the AC offshore substation. A secondary panel cabinet and a combination table are set in the communication relay room. The 66kV switchgear and secondary panel cabinet are arranged against the wall in the 66kV switchgear room and the communication relay room respectively. Ventilation, heat dissipation and maintenance space are reserved behind the 66kV switchgear and secondary panel cabinet, and operation space is reserved in front of the 66kV switchgear and secondary panel cabinet.

[0017] Further: The AC offshore substation is equipped with a backup emergency power supply, which is set in the backup power supply room. The backup power supply room and the 66kV switch cabinet room are set on the same side of the AC offshore substation. The backup emergency power supply is an energy storage battery system or a diesel generator set. The battery system includes an energy storage battery cluster, a junction cabinet, a battery control cabinet, a converter, an isolation main transformer, and an incoming line cabinet.

[0018] Furthermore: a HVAC room and a water pump room are set up on the bottom plywood of the AC offshore booster station. The HVAC room and the water pump room are set up on the same side of the AC offshore booster station as the high-voltage GIS power distribution device room. Only a fine water mist tank and a water pump for fire fighting are set up in the water pump room.

[0019] Furthermore: the main transformer room, high-voltage GIS power distribution device room and high-voltage reactor room are located on the middle deck of the AC offshore substation, and are all open to the positions corresponding to the top deck, forming the air above the main transformer room, the air above the high-voltage GIS power distribution device room and the air above the high-voltage reactor room on the top deck respectively.

[0020] Furthermore: a first battery room and a second battery room are arranged on the top deck of the AC offshore substation, the first battery room and the main transformer room are arranged on the same side of the AC offshore substation, and the second battery room and the 66kV switch cabinet room are arranged on the same side of the AC offshore substation.

[0021] Furthermore: a low-voltage distribution room is set between the backup power room and the 66kV switch cabinet room; an emergency distribution room is set on the middle plywood of the AC offshore substation, and the emergency distribution room and the high-voltage GIS distribution device room are set on the same side of the AC offshore substation.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] This invention connects 66kV AC collector lines to an offshore substation, streamlining electrical wiring and reducing electrical equipment while still meeting the power transmission requirements of the offshore wind farm. Furthermore, by making the cabins more compact and eliminating unnecessary compartments, the size and weight of the offshore substation are reduced, achieving a lightweight design. This effectively reduces the construction cost and timeframe of the wind farm, resulting in significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a floor plan of the present invention;

[0025] Figure 2 It is a second-floor plan layout of the present invention;

[0026] Figure 3 It is a three-story floor plan of the present invention;

[0027] Figure 4It is a schematic diagram of the introduction of the high-voltage submarine cable of the present invention.

[0028] Figure markings: 101-HVAC room; 102-pump room; 103-high-voltage submarine cable vertical lead-in area; 104-66kV submarine cable lead-in area; 201-main transformer room; 202-high-voltage GIS power distribution device room; 203-backup power supply room; 204-66kV switchgear room; 205-low-voltage power distribution room; 206-emergency power distribution room; 207-high-voltage reactor room; 208-anchoring device; 209-high-voltage submarine cable; 301-above the main transformer room; 302-above the high-voltage GIS power distribution device room; 303-above the high-voltage reactor room; 304-first battery room; 305-second battery room; 306-communication relay protection room. DETAILED DESCRIPTION

[0029] To help those skilled in the art better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the present invention. To better illustrate the present embodiments, certain components in the drawings may be omitted, enlarged, or reduced, and do not represent the dimensions of actual products. It is understandable that certain well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present invention.

[0030] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0031] like Figures 1 to 4 As shown, a light-weight single-main-transformer AC offshore booster station includes a single main transformer, gas-insulated switchgear, 66kV switchgear, a grounding transformer and station transformer, and a high-voltage reactor;

[0032] The AC offshore substation includes three decks arranged in the vertical direction, each deck consisting of multiple functional rooms. The single main transformer is arranged in the main transformer room 201 of the AC offshore substation, which is 10 meters high. The gas-insulated switchgear is arranged in the high-voltage GIS power distribution device room 202. The gas-insulated switchgear in the high-voltage GIS power distribution device room 202 is connected in the form of a line-to-transformer group connection. The width of the indoor inspection walkway is not less than 1000mm, and the width of the main passage near the circuit breaker side is 2000mm to 3500mm, which meets the requirements of the specification. The high-voltage reactor is arranged in the high-voltage reactor room 207. The 66kV switchgear and the grounding transformer and station transformer are both arranged in the 66kV switchgear room 204. The 66kV switchgear room 204 is also equipped with a small resistance cabinet and a secondary local control cabinet. The secondary local control cabinet is arranged to facilitate the secondary wiring of the switchgear. The 66kV switchgear room 204 is 5 meters high.

[0033] The main transformer room 201 is arranged in the middle of the AC offshore substation, the high-voltage GIS power distribution device room 202 and the high-voltage reactor room 207 are arranged side by side on one side of the main transformer room 201, and the high-voltage GIS power distribution device room 202 and the high-voltage reactor room 207 occupy multiple decks in the height direction, and the 66kV switchgear room 204 is arranged on the other side of the main transformer room 201;

[0034] The main transformer and the gas-insulated switchgear are connected by a line main transformer group. The main transformer and the gas-insulated switchgear are connected by a gas-insulated pipeline bus. The high-voltage side of the main transformer is directly grounded. The neutral point complete set of equipment is no longer installed in the main transformer room 201, making the room more compact. The high-voltage reactor and the gas-insulated switchgear are connected by a gas-insulated pipeline bus. The gas-insulated pipeline bus does not need to consider the live distance and electromagnetic interference.

[0035] Each 66kV busbar section of the 66kV switchgear is equipped with a grounding transformer and station transformer incoming line cabinet, a main transformer incoming line cabinet and several wind turbine incoming line cabinets. According to the capacity of the wind farm and the number of low-voltage windings of the main transformer, the AC offshore substation is equipped with one or two 66kV busbar sections and adopts single busbar wiring.

[0036] The main transformer or high-voltage reactor is connected to one end of the gas-insulated pipeline busbar, and the other end of the gas-insulated pipeline busbar passes through the bulkhead of the high-voltage GIS power distribution device room 202 and is connected to the gas-insulated switchgear. It is arranged horizontally in the AC offshore substation.

[0037] A 66kV submarine cable leading-in area is opened below the 66kV switch cabinet room 204. The 66kV submarine cable passes through the bottom deck of the offshore booster station to the 66kV submarine cable leading-in area, and is led up to the middle-level 66kV switch cabinet room 204 to connect to the 66kV switch cabinet.

[0038] A high-voltage submarine cable 209 vertical leading-in area is provided directly below the submarine cable incoming line spacing sleeve in the high-voltage GIS power distribution device room 202. The high-voltage submarine cable 209 passes through the bottom deck of the offshore substation and is vertically led up to the GIS submarine cable incoming line spacing sleeve in the middle-level high-voltage GIS power distribution device room 202. The high-voltage submarine cable 209 is fixed on the bottom deck by an anchoring device 208. The high-voltage submarine cable 209 has no turning path section in the AC offshore substation.

[0039] A communication relay room 306 is set on the top deck of the AC offshore substation. The communication relay room 306 and the 66kV switchgear room 204 are set on the same side of the AC offshore substation. A secondary panel cabinet and a combination platform are set in the communication relay room 306. The 66kV switchgear and secondary panel cabinet are arranged against the wall in the 66kV switchgear room 204 and the communication relay room 306 respectively. Ventilation, heat dissipation and maintenance space are reserved behind the 66kV switchgear and secondary panel cabinet. Operation space is reserved in front of the 66kV switchgear and secondary panel cabinet. All wiring and debugging are completed in front of the cabinet.

[0040] The AC offshore substation is equipped with a backup emergency power supply, housed in backup power supply room 203. This room measures 9.75m x 6.6m and is 5m high. It is located on the same side of the AC offshore substation as the 66kV switchgear room 204. The backup emergency power supply is a battery system or diesel generator set. The battery system includes a battery cluster, a combiner cabinet, a battery control cabinet, a converter, an isolation main transformer, and an incoming line cabinet. Lithium iron phosphate batteries are typically used for the storage batteries, and their capacity and discharge time are determined by factors such as the emergency load capacity, duration, system efficiency, and depth of discharge.

[0041] HVAC room 101 and pump room 102 are located on the ground floor plywood of the AC offshore substation. These rooms, along with the high-voltage GIS power distribution equipment room 202, are located on the same side of the station. Pump room 102 houses only a fine water mist tank and pump for firefighting, and no domestic water tank or pump for on-duty personnel. The room is 3.5 meters high. HVAC room 101 houses all HVAC equipment and has a height of 4.0 meters.

[0042] The main transformer room 201, high-voltage GIS power distribution device room 202, and high-voltage reactor room 207 are located on the middle deck of the AC offshore substation and are all open to the top deck, forming a space 301 above the main transformer room, a space 302 above the high-voltage GIS power distribution device room, and a space 303 above the high-voltage reactor room on the top deck. A first battery room 304 and a second battery room 305 are located on the top deck of the AC offshore substation. The first battery room 304 and the main transformer room 201 are located on the same side of the AC offshore substation, and the second battery room 305 and the 66kV switchgear room 204 are located on the same side of the AC offshore substation.

[0043] A low-voltage distribution room 205 is set between the backup power supply room 203 and the 66kV switch cabinet room 204; an emergency distribution room 206 is set on the middle plywood of the AC offshore substation, and the emergency distribution room 206 and the high-voltage GIS distribution device room 202 are set on the same side of the AC offshore substation. There are 7 low-voltage cabinets in the low-voltage distribution room 205 and 5 low-voltage cabinets in the emergency distribution room 206. The low-voltage cabinets are all placed against the wall and are inspected in front of the cabinets and arranged in single rows.

[0044] The present invention does not have a temporary rest room for personnel on duty, nor does it have water tanks, sewage treatment systems, and other equipment for personnel living. Compared with traditional offshore booster stations, the present invention has patrol walkways outside the first battery room 304, the second battery room 305, and the communication relay room 306 (the two walkways are independent of each other on the third floor), but eliminates the patrol walkways surrounding all other cabins on the third floor. The patrol walkways are only extended to the vicinity of the cabin entrance on the third floor after the stairs are led from the second floor to the third floor. The present invention eliminates the stairs leading up to the fourth floor and only provides a steel ladder with a cage for the upward movement. No internal walkways are set between the cabins on each floor.

[0045] This invention eliminates the need for a maintenance crane inside the high-voltage GIS distribution equipment room 202. Instead, it provides only a maintenance cover above the room 202, reducing the overall height of the room. In the event of a local fault in the high-voltage GIS distribution equipment (i.e., gas-insulated switchgear), a small rooftop crane can be used to lift the faulty component onto a transport vessel. In the event of an overall fault in the high-voltage GIS distribution equipment, a crane vessel can be used to lift the entire unit onto the transport vessel for transport to a land-based maintenance base with a more favorable maintenance environment.

[0046] In this embodiment, the dimensions of the first floor of the AC offshore booster station with a light single main transformer are 43.2m×26.5m×5m, the dimensions of the second floor are 47.5m×30.7m×5m, and the dimensions of the third floor are 46.3m×26.2m×5m, where the above dimensions are all length×width×height, and the floor height is the distance between floors. It is suitable for offshore wind farms with an installed capacity of 400MW. Compared with the existing AC offshore booster station with an installed capacity of 400MW, 35kV submarine cable access, and high-voltage reactors, the deck area is reduced by about 38%, the floor height is reduced by about 9.1%, and the weight is reduced by about 28%.

[0047] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the AC offshore booster station with a light single main transformer of the present invention, and can produce the positive effects described in the present invention.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An AC offshore booster station with a single lightweight main transformer, characterized by: It includes a single main transformer, gas-insulated switchgear, 66kV switchgear, grounding transformer and station transformer, and high-voltage reactor; The AC offshore booster station comprises three decks arranged from bottom to top, wherein the single main transformer is arranged in a main transformer room (201) of the AC offshore booster station, the gas insulated switchgear is arranged in a high-voltage GIS power distribution device room (202), the high-voltage reactor is arranged in a high-voltage reactor room (207), and the 66kV switch cabinet and the grounding transformer and station transformer are both arranged in a 66kV switch cabinet room (204); The main transformer room (201) is arranged in the middle of the AC offshore substation, the high-voltage GIS power distribution device room (202) and the high-voltage reactor room (207) are arranged side by side on one side of the main transformer room (201), the main transformer room (201), the high-voltage GIS power distribution device room (202) and the high-voltage reactor room (207) occupy multiple decks in the height direction, and the 66kV switch cabinet room (204) is arranged on the other side of the main transformer room (201); The main transformer and the gas-insulated switchgear are connected by a line main transformer group connection, the main transformer and the gas-insulated switchgear are connected by a first gas-insulated pipeline bus, the high-voltage side of the main transformer is directly grounded, and the high-voltage reactor and the gas-insulated switchgear are connected by a second gas-insulated pipeline bus; The power generated by the wind farm is connected to the 66kV switchgear in the offshore substation via a 66kV submarine cable. Each 66kV busbar section of the 66kV switchgear is equipped with a grounding transformer and station transformer incoming cabinet, a main transformer incoming cabinet, and several wind turbine incoming cabinets. The AC offshore substation is equipped with one or two 66kV busbar sections and adopts single busbar wiring. The main transformer room (201), the high-voltage GIS power distribution device room (202) and the high-voltage reactor room (207) are located on the middle deck of the AC offshore substation and are all open at positions corresponding to the top deck, with only an inspection cover being provided above the high-voltage GIS power distribution device room (202).

2. The AC offshore booster station with a light single main transformer according to claim 1, characterized in that: The main transformer is connected to one end of the first gas-insulated pipeline busbar, the high-voltage reactor is connected to one end of the second gas-insulated pipeline busbar, and the other ends of the first gas-insulated pipeline busbar and the second gas-insulated pipeline busbar are connected to the gas-insulated switchgear through the bulkhead of the high-voltage GIS power distribution device room (202).

3. The AC offshore booster station with a lightweight single main transformer according to claim 1, characterized in that: A 66kV submarine cable leading-in area (104) is provided below the 66kV switch cabinet room (204). The 66kV submarine cable passes through the bottom deck of the offshore booster station to the 66kV submarine cable leading-in area (104), and is led up to the 66kV switch cabinet room (204) on the middle deck and connected to the 66kV switch cabinet.

4. The AC offshore booster station with a lightweight single main transformer according to claim 1, characterized in that: A high-voltage submarine cable vertical leading-in area (103) is provided directly below the submarine cable entry spacing sleeve in the high-voltage GIS power distribution device room (202). The high-voltage submarine cable (209) passes through the bottom deck of the offshore booster station and is vertically led up to the GIS submarine cable entry spacing sleeve of the middle-level high-voltage GIS power distribution device room (202). The high-voltage submarine cable (209) is fixed on the bottom deck by an anchoring device (208). The high-voltage submarine cable (209) has no turning path section in the AC offshore booster station.

5. The AC offshore booster station with a light single main transformer according to claim 1, characterized in that: A communication relay room (306) is provided on the top deck of the AC offshore substation. The communication relay room (306) and the 66kV switch cabinet room (204) are provided on the same side of the AC offshore substation. A secondary panel cabinet and a combination platform are provided in the communication relay room (306). The 66kV switch cabinet and the secondary panel cabinet are arranged against the wall in the 66kV switch cabinet room (204) and the communication relay room (306), respectively. Ventilation, heat dissipation and maintenance space are reserved behind the 66kV switch cabinet and the secondary panel cabinet, and operation space is reserved in front of the 66kV switch cabinet and the secondary panel cabinet.

6. The AC offshore booster station with a light single main transformer according to claim 1, characterized in that: The AC offshore substation is provided with a backup emergency power supply, which is arranged in a backup power supply room (203). The backup power supply room (203) and the 66kV switch cabinet room (204) are arranged on the same side of the AC offshore substation. The backup emergency power supply is an energy storage battery system or a diesel generator set. The battery system includes an energy storage battery cluster, a junction cabinet, a battery control cabinet, a converter, an isolation main transformer, and an incoming line cabinet.

7. The AC offshore booster station with a light single main transformer according to claim 1, characterized in that: A heating and ventilation room (101) and a water pump room (102) are arranged on the bottom plywood of the AC offshore booster station. The heating and ventilation room (101) and the water pump room (102) are arranged on the same side of the AC offshore booster station as the high-voltage GIS power distribution device room (202). Only a fine water mist tank and a water pump for fire fighting are arranged in the water pump room (102).

8. The AC offshore booster station with a light single main transformer according to claim 1, characterized in that: On the top deck, an airspace above the main transformer room (301), an airspace above the high-voltage GIS power distribution device room (302), and an airspace above the high-voltage reactor room (303) are formed respectively.

9. The AC offshore booster station with a light single main transformer according to claim 1, characterized in that: A first battery room (304) and a second battery room (305) are arranged on the top deck of the AC offshore booster station. The first battery room (304) and the main transformer room (201) are arranged on the same side of the AC offshore booster station. The second battery room (305) and the 66kV switch cabinet room (204) are arranged on the same side of the AC offshore booster station.

10. The AC offshore booster station with a light single main transformer according to claim 6, characterized in that: A low-voltage distribution room (205) is provided between the backup power supply room (203) and the 66kV switch cabinet room (204); an emergency distribution room (206) is provided on the middle plywood of the AC offshore substation, and the emergency distribution room (206) and the high-voltage GIS distribution device room (202) are provided on the same side of the AC offshore substation.

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