CN218242574U - Electrical main wiring structure suitable for medium-sized offshore booster station with high resistance of double main transformers - Google Patents

Abstract

The utility model provides an electrical main wiring structure suitable for a medium-sized offshore step-up station with double main transformers and high resistance, comprising a first group of main transformer units (100), a second group of main transformer units (500), a first The first group of 220kV power distribution unit (200), the second group of 220kV power distribution unit (600), the first group of 66kV power distribution unit (300), the second group of 66kV power distribution unit (700) and one group of station Electric unit (400). The utility model simplifies the equipment of the offshore booster station, simplifies the structure of the booster station, and reduces the size and weight of the booster station while meeting the delivery requirements of the offshore wind farm.

Description

An electrical main wiring suitable for a medium-sized offshore booster station with dual main transformers and high resistance structure

technical field

The invention relates to the field of offshore wind power generation, in particular to an electrical main wiring structure suitable for a medium-sized offshore booster station with double main transformers and high resistance.

Background technique

In recent years, with the continuous development of economy and society, my country's energy demand will continue to grow. Increasing energy supply, ensuring energy security, protecting the ecological environment, and promoting sustainable economic and social development are a major strategic task for my country's economic and social development.

With the advancement of offshore wind power technology and the reduction of cost, its global market scale is expanding rapidly. As of the end of 2020, my country's grid-connected offshore wind power capacity has reached approximately 8.99 million kW, ranking among the top three in the world, and its new offshore wind power installed capacity has ranked first in the world for two consecutive years.

At the same time, as my country's offshore wind power enters the stage of clustering and large-scale development, and the era of grid parity after 2021 is coming, explore technical solutions for offshore wind power projects with larger capacity, and study methods to reduce project construction investment costs. The development of wind power has very important practical significance. Offshore booster stations are an extremely important part of offshore wind power projects. It is necessary to explore offshore booster station solutions that meet the development needs of offshore wind power in the new era, have larger capacity, and have stronger economic competitiveness.

Contents of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide an electrical main wiring structure suitable for a medium-sized offshore booster station with double main transformers and high resistance. The present invention simplifies the equipment of the offshore booster station, simplifies the structure of the booster station, and reduces the size and weight of the booster station while meeting the delivery requirements of the offshore wind farm.

In order to solve the problems of the technologies described above, the present invention is realized through the following technical solutions:

An electrical main wiring structure suitable for a medium-sized offshore booster station with dual main transformers and high resistance, characterized in that it includes a first group of main transformer units, a second group of main transformer units, a first group of 220kV power distribution device units, The second group of 220kV power distribution unit, the first group of 66kV power distribution unit, the second group of 66kV power distribution unit and a group of station power units.

Further: the high-voltage side of the first group of main transformer units is connected to the first group of 220kV power distribution device units, and the low-voltage side of the first group of main transformer units is connected to the first group of 66kV power distribution device units;

The second group includes the high-voltage side of the main transformer unit connected to the second group of 220kV power distribution device units, and the second group includes the low-voltage side of the main transformer unit connected to the second group of 66kV power distribution device units;

The station power unit has the first low-voltage distribution bus, the second low-voltage distribution bus and the third low-voltage distribution bus. The first low-voltage distribution bus is connected with the first group of 66kV power distribution units, and the second The low-voltage power distribution bus is connected to the second group of 66kV power distribution units, and the third low-voltage power distribution bus is connected to the diesel generator.

Further: a main transformer is arranged in the first group of main transformer units and the second group of main transformer units, wherein,

The high-voltage side of the main transformer of the first group of main transformation units is connected to the first group of 220kV power distribution unit through 220kV power cables, and the low-voltage side of the main transformer of the first group of main transformation units is connected to the first group of 66kV power distribution devices through power cables unit connection;

The high-voltage side of the main transformer of the second group of main transformation units is connected to the second group of 220kV power distribution device units through 220kV power cables, and the low-voltage side of the main transformer of the second group of main transformation units is connected to the second group of 66kV power distribution devices through power cables unit connection.

Further: the main transformer is a three-phase, copper coil, on-load voltage regulating, oil-immersed ordinary transformer.

Further: the structures of the first group of 220kV power distribution device units and the second group of 220kV power distribution device units are completely consistent, and the first group of 220kV power distribution device units and the second group of 220kV power distribution device units are both 220kV GIS;

The incoming line side of the first group of 220kV power distribution unit is connected to the high voltage side of the main transformer of the first group of main transformer units, and the outlet side of the first group of 220kV power distribution unit is connected to the 220kV submarine cable;

The incoming line side of the second group of 220kV power distribution unit is connected to the high-voltage side of the main transformer of the second group of main transformer units, and the outgoing side of the second group of 220kV power distribution unit is connected to the 220kV submarine cable.

Further: the first group of 66kV power distribution device units includes the substation incoming line interval of the first power distribution device unit, the bus equipment of the first power distribution device unit, the main transformer outlet line interval of the first power distribution device unit, The four first fan inlet intervals, the section circuit breaker cabinet and the first section of 66kV busbar.

Further: the second group of 66kV power distribution device units includes segmented isolation cabinets, busbar equipment of the second power distribution device unit, main transformer outlet line intervals of the second power distribution device unit, four second fan inlet line intervals, The substation transformer line interval of the second power distribution device unit and the second section of 66kV busbar.

Further: the station power unit also includes a transformer for the first station and a transformer for the second station, the high-voltage side of the transformer for the first station is connected to the first group of 66kV power distribution device units, and the high-voltage side of the transformer for the second station It is connected with the second group of 66kV power distribution unit; the low-voltage side of the transformer for the first station is connected to the first low-voltage power distribution bus, and the low-voltage side of the transformer for the second station is connected to the second low-voltage power distribution bus.

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

1. The present invention adopts two-circuit 220kV line transformer group wiring, which has the advantages of simple structure, less investment, less land occupation, and good economic benefits. The station power unit of the present invention adopts three sections of low-voltage power distribution busbars, wherein the first section of low-voltage power distribution busbars is connected with the first group of 66kV power distribution device units, and the second section of low-voltage power distribution busbars is connected with the second group of 66kV power distribution device units The unit is connected, and the third low-voltage power distribution bus is connected to the diesel generator.

2. The electrical main wiring described in the present invention is helpful to realize the compact layout of the medium-sized offshore booster station and the optimization of the overall size and weight of the booster station, further reduce the investment and construction cost of the offshore booster station, and increase the investment of offshore wind power projects benefit.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of the first group of main transformer units of the present invention;

Fig. 3 is the structural representation of the first group of 220kV power distribution unit of the present invention;

Fig. 4 is a schematic structural view of the first group of 66kV distribution device units of the present invention;

Fig. 5 is a schematic structural view of the station power unit of the present invention;

Fig. 6 is the structural representation of the second group of main transformer units of the present invention;

Fig. 7 is a structural schematic diagram of the second group of 220kV power distribution device units of the present invention;

Fig. 8 is a schematic structural diagram of the second group of 66kV power distribution device units of the present invention.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the preferred embodiments of the present invention will be described below in conjunction with specific examples, but it should be understood that the accompanying drawings are only for illustrative purposes, and cannot be interpreted as an explanation of the present invention. Restrictions; In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, some known structures and their descriptions in the drawings may Omissions are understandable. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as limiting the present invention.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for limiting the present invention.

As shown in Figures 1 to 8, an electrical main wiring structure suitable for a medium-sized offshore booster station with double main transformers and high resistance, including a first group of main transformer units 100, a second group of main transformer units 500, a first group of 220kV power distribution unit 200 , the second group of 220kV power distribution unit 600 , the first group of 66kV power distribution unit 300 , the second group of 66kV power distribution unit 700 and a group of station power units 400 .

The high-voltage side of the first group of main transformer units 100 is connected to the first group of 220kV power distribution device units 200, and the low-voltage side of the first group of main transformer units 100 is connected to the first group of 66kV power distribution device units 300;

The second group includes the high-voltage side of the main transformer unit 500 connected to the second group of 220kV power distribution device units 600, and the second group includes the low-voltage side of the main transformer unit 500 connected to the second group of 66kV power distribution device units 700;

The station power unit 400 has the first section of low-voltage power distribution bus 441, the second section of low-voltage power distribution bus 442 and the third section of low-voltage power distribution bus 443, the first section of low-voltage power distribution bus 441 and the first group of 66kV power distribution device units 300, the second low-voltage power distribution bus 442 is connected to the second group of 66kV power distribution unit 700, and the third low-voltage power distribution bus 443 is connected to the diesel generator 431.

A main transformer is arranged in the first group of main transformer units 100 and the second group of main transformer units 500, wherein,

The high-voltage side of the main transformer 111 of the first group of main transformation units is connected to the first group of 220kV power distribution device units 200 through 220kV power cables, and the low-voltage side of the main transformer 111 of the first group of main transformation units is connected to the first group of 66kV power distribution units through power cables. The power distribution unit 300 is connected;

The high-voltage side of the main transformer of the second group of main transformation units is connected to the second group of 220kV power distribution unit 600 through 220kV power cables, and the low-voltage side of the main transformer of the second group of main transformation units is connected to the second group of 66kV power distribution units through power cables The device unit 700 is connected.

The structure of the first group of main transformation units 100 and the second group of main transformation units 500 is exactly the same.

The main transformer 111 of the first group of main transformation units is provided with the current transformer 112 of the first group of main transformation units at the high voltage side; the main transformer 111 of the first group of main transformation units is provided with the current of the first group of main transformation units at the high voltage neutral point Transformer 113.

The main transformer of the second group of main transformation units is provided with the current transformer of the second group of main transformation units on the high voltage side; the main transformer of the second group of main transformation units is provided with the current transformer of the second group of main transformation units at the high voltage neutral point.

The main transformer is a three-phase, copper coil, on-load voltage regulation, natural oil circulation cooling, low-voltage double-split, oil-immersed ordinary transformer.

The structures of the first group of 220kV power distribution device units 200 and the second group of 220kV power distribution device units 600 are completely consistent, and both the first group of 220kV power distribution device units 200 and the second group of 220kV power distribution device units 600 are 220kV GIS; 220kV is the voltage level, and GIS is sulfur hexafluoride gas-insulated fully enclosed power distribution device.

The incoming side of the first group of 220kV power distribution unit 200 is connected to the high voltage side of the main transformer 111 of the first group of main transformer units, and the outgoing side of the first group of 220kV power distribution unit 200 is connected to the 220kV submarine cable;

The incoming side of the second group of 220kV power distribution unit 600 is connected to the high voltage side of the main transformer of the second group of main transformer units, and the outgoing side of the second group of 220kV power distribution unit 600 is connected to the 220kV submarine cable.

The electrical equipment in the first group of 220kV power distribution unit 200 is from the main transformer 111 side of the first group of main transformation unit to the 220kV submarine cable side, in turn the first arrester 271 of the first power distribution unit, the first power distribution unit The first grounding switch 231 of the first power distribution device unit, the first isolating switch 221 of the first power distribution device unit, the second grounding switch 232 of the first power distribution device unit, the first current transformer 261 of the first power distribution device unit, the first power distribution device unit The circuit breaker 211 of the electrical device unit, the second current transformer 262 of the first power distribution device unit, the third grounding switch 233 of the first power distribution device unit, the first isolating switch 222 of the first power distribution device unit, the second The fast grounding switch 241 of a power distribution device unit, the voltage transformer 251 of the first power distribution device unit, and the second lightning arrester 272 of the first power distribution device unit; wherein, the first isolating switch 221 of the first power distribution device unit, A disconnector 222 of the first power distribution device unit, a first current transformer 261 of the first power distribution device unit, a second current transformer 262 of the first power distribution device unit, and a circuit breaker of the first power distribution device unit 211 is connected to the line in series, and the rest of the electrical equipment and high-resistance incoming line branch are connected to the line in parallel.

The first group of 66kV power distribution device units 300 includes the substation incoming line interval 310 of the first power distribution device unit, the bus equipment 320 of the first power distribution device unit, and the main transformer outgoing line interval 330 of the first power distribution device unit , Four first fan inlet line intervals 340/350/360/370, section circuit breaker cabinet 380 and first section 66kV busbar 390.

The station transformer incoming line interval 310 of the first power distribution device unit is connected to the first 66kV busbar 390 on the incoming line side, and the outgoing line side is connected to the station power unit 400; the main transformer outgoing line interval 330 of the first power distribution device unit The incoming line side is connected to the first section of 66kV bus 390, and the outgoing line side is connected to the first group of main transformer units 100; the incoming line side of the four first wind turbines is connected to the 66kV collector cable of the wind farm at intervals of 340/350/360/370 , the outlet side is connected to the first section of 66kV busbar 390;

Taking the substation variable incoming line interval 310 of the first power distribution device unit as an example to describe the implementation: the electrical equipment in the station variable incoming line interval 310 of the first power distribution device unit is transferred from the wind farm power collecting submarine cable to the first Section 66kV busbar 390 includes zero-sequence current transformer 319 , lightning arrester 318 , fast earthing switch 316 , isolating switch 313 , earthing switch 315 , current transformer 317 , circuit breaker 311 , earthing switch 314 and isolating switch 312 .

The layout of the four second fan inlet lines 740/750/760/770 electrical equipment is exactly the same as the station transformer inlet line interval 310 of the first power distribution unit; the main transformer outlet line interval 330 and distribution line interval of the first power distribution unit Compared with the electrical equipment in the substation transformer incoming line bay 310 of the first power distribution unit, the section circuit breaker cabinet 380 has reduced zero-sequence current transformers, and the layout of the rest of the electrical equipment is exactly the same; the busbar of the first power distribution unit The equipment 320 is connected in parallel to the first section of 66kV bus 390. The bus equipment 320 of the first power distribution device unit includes the first grounding switch 322 of the bus equipment, the isolating switch 321 of the bus equipment, the second grounding switch 313 of the bus equipment, and the lightning arrester of the bus equipment. 314 and bus equipment voltage transformer 325.

The second group of 66kV power distribution device units 700 includes segment isolation cabinets 710, busbar equipment 720 of the second power distribution device unit, main transformer outgoing line interval 730 of the second power distribution device unit, and four second fan incoming line intervals 740/750/760/770, the substation transformer line interval 780 of the second power distribution device unit and the 66kV busbar 790 of the second section.

The incoming line side of the section isolation cabinet 710 is connected to the first group of 66kV power distribution device units 400, and the outgoing line side is connected to the second section of 66kV bus 790; the main transformer outgoing line interval 730 of the second power distribution device unit is connected to the second section The 66kV busbar 790 is connected, and the outlet side is connected to the second group of main transformer units 600; the inlet side of the four second wind turbines is connected to the 66kV collector submarine cable at the interval of 740/750/760/770, and the outlet side is connected to the second section The 66kV bus 790 is connected; the incoming line interval 780 of the station transformer of the second power distribution unit is connected to the second 66kV bus 790, and the outgoing side is connected to the station power unit 500; the second group of 66kV power distribution units 700 In addition to the segmented isolation cabinet 710, the electrical equipment of other parts is completely the same as the part with the same function in the first group of 66kV power distribution unit 400; the segmented isolation cabinet 710 is composed of the isolating switch 711 and The grounding switch 712 of the section isolation cabinet is composed.

The station power unit 400 also includes a transformer 411 for the first station and a transformer 412 for the second station. The high-voltage side of the first station is connected to the second group of 66kV power distribution device units 700; the low-voltage side of the transformer 411 for the first station is connected to the first low-voltage power distribution bus 441, and the low-voltage side of the transformer 412 for the second station is connected to the second low-voltage distribution bus The bus bar 442 is connected.

Among them, the high-voltage side of the transformer 411 for the first station is connected to the station-use transformer feeder interval 310 of the first power distribution device unit in the first group of 66kV power distribution device units 300, and the low-voltage side is connected to the first stage via the first circuit breaker 451. The low-voltage power distribution bus 441 is connected, and the neutral point of the high-voltage side is grounded through the grounding resistance 421 of the transformer used for the first station; The station of the unit is connected with a variable incoming line interval 780, the low-voltage side is connected to the second section of low-voltage power distribution bus 442 through the second circuit breaker 452, and the neutral point of the high-voltage side is grounded through the grounding resistance 422 of the transformer used in the second station; the first section The low-voltage power distribution bus 441 and the second low-voltage power distribution bus 442 are connected through the fifth circuit breaker 455; the first low-voltage power distribution bus 441 and the third low-voltage power distribution bus 443 are connected through the fourth circuit breaker 454 and the eighth circuit breaker 458 connection; the second low-voltage power distribution bus 442 and the third low-voltage power distribution bus 443 are connected through the sixth circuit breaker 456 and the seventh circuit breaker 457 .

According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use a kind of electrical main wiring structure of the present invention suitable for a medium-sized offshore booster station with double main transformers and high resistance, and can produce the positive effect.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications and equivalent changes made to the above embodiments according to the technical essence of the present invention all fall within the scope of the present invention. within the scope of protection.

Claims (8)

1. An electrical main wiring structure suitable for a medium-sized offshore step-up station with double main transformers with high resistance, characterized in that: it includes a first group of main transformer units (100), a second group of main transformer units (500), a second group of main transformer units (500), a A group of 220kV power distribution unit (200), a second group of 220kV power distribution unit (600), a first group of 66kV power distribution unit (300), a second group of 66kV power distribution unit (700) and a group of stations A power consumption unit (400). 2. The electrical main wiring structure suitable for a medium-sized offshore booster station with double main transformers and high resistance according to claim 1, characterized in that: the high voltage side of the first group of main transformer units (100) is connected to the The first group of 220kV power distribution unit (200) is connected, and the low-voltage side of the first group of main transformer unit (100) is connected with the first group of 66kV power distribution unit (300); The second group includes the high-voltage side of the main transformer unit (500) connected to the second group of 220kV power distribution device units (600), and the second group includes the low-voltage side of the main transformer unit (500) connected to the second group of 66kV power distribution devices unit (700) connection; The station power unit (400) has the first section of low-voltage power distribution bus (441), the second section of low-voltage power distribution bus (442) and the third section of low-voltage power distribution bus (443), the first section of low-voltage power distribution bus (441 ) is connected to the first group of 66kV power distribution unit (300), the second section of low-voltage power distribution busbar (442) is connected to the second group of 66kV power distribution unit (700), and the third section of low-voltage power distribution busbar (443) is connected to The diesel generator (431) is connected. 3. The electrical main wiring structure suitable for a medium-sized offshore booster station with double main transformers and high resistance according to claim 1, characterized in that: the first group of main transformer units (100) and the second group Each main transformer unit (500) is provided with a main transformer, wherein, The high-voltage side of the main transformer (111) of the first group of main transformation units is connected to the first group of 220kV power distribution unit (200) through a 220kV power cable, and the low-voltage side of the main transformer (111) of the first group of main transformation units is connected by power The cables are connected to the first group of 66kV power distribution unit (300); The high-voltage side of the main transformer of the second group of main transformation units is connected to the second group of 220kV power distribution unit (600) through 220kV power cables, and the low-voltage side of the main transformer of the second group of main transformation units is connected to the second group of 66kV power cables through power cables The power distribution unit (700) is connected. 4. An electrical main wiring structure suitable for a medium-sized offshore step-up station with dual main transformers and high impedance according to claim 3, characterized in that: the main transformer is a three-phase, copper coil, on-load voltage regulating , Oil-immersed ordinary transformer. 5. The electrical main wiring structure suitable for a medium-sized offshore step-up station with dual main transformers and high resistance according to claim 3, characterized in that: the first group of 220kV power distribution unit (200) and the second The structures of the two groups of 220kV power distribution unit (600) are exactly the same, the first group of 220kV power distribution unit (200) and the second group of 220kV power distribution unit (600) are both 220kV GIS; The incoming line side of the first group of 220kV power distribution unit (200) is connected to the high voltage side of the main transformer (111) of the first group of main transformer unit, and the outgoing line side of the first group of 220kV power distribution unit (200) is connected to the 220kV submarine cable connect; The incoming side of the second group of 220kV power distribution unit (600) is connected to the high voltage side of the main transformer of the second group of main transformer unit, and the outgoing side of the second group of 220kV power distribution unit (600) is connected to the 220kV submarine cable. 6. The electrical main wiring structure suitable for a medium-sized offshore step-up substation with dual main transformers and high resistance according to claim 1, characterized in that: the first group of 66kV power distribution unit (300) includes the first The station transformer incoming line interval (310) of a power distribution device unit, the busbar equipment (320) of the first power distribution device unit, the main transformer outgoing line interval (330) of the first power distribution device unit, the four first fan inlets Line bay (340/350/360/370), section circuit breaker cabinet (380) and first section 66kV busbar (390). 7. The electrical main wiring structure suitable for a medium-sized offshore step-up substation with dual main transformers and high resistance according to claim 1, characterized in that: the second group of 66kV power distribution unit (700) includes section isolation cabinet (710), the busbar equipment of the second power distribution unit (720), the main transformer outlet line interval of the second power distribution unit (730), the four second fan inlet line intervals (740/750/760/ 770), the substation transformer line interval (780) of the second power distribution device unit and the second section of 66kV bus (790). 8. The electrical main wiring structure suitable for a medium-sized offshore step-up substation with dual main transformers and high resistance according to claim 2, characterized in that: the station power unit (400) also includes a first station power unit (400) Transformer (411), transformer (412) for the second station, the high-voltage side of the transformer (411) for the first station is connected to the first group of 66kV power distribution unit (300), and the high-voltage side of the transformer (412) for the second station Connect with the second group of 66kV power distribution unit (700); the low-voltage side of the transformer (411) for the first station is connected to the first low-voltage power distribution bus (441), and the low-voltage side of the transformer (412) for the second station is connected to the first The second-stage low-voltage power distribution busbar (442) is connected.

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