CN113206513B - Ultra-high pressure sending-out system of offshore wind farm - Google Patents

Ultra-high pressure sending-out system of offshore wind farm Download PDF

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Publication number
CN113206513B
CN113206513B CN202110470106.8A CN202110470106A CN113206513B CN 113206513 B CN113206513 B CN 113206513B CN 202110470106 A CN202110470106 A CN 202110470106A CN 113206513 B CN113206513 B CN 113206513B
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voltage
bus
main transformer
main
collecting
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CN113206513A (en
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张振
汤翔
徐晓燕
陆莹
李炬添
赵陆尧
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China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
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China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an ultrahigh-pressure delivery system of an offshore wind farm. The ultra-high voltage sending-out system of the offshore wind farm comprises a plurality of offshore fans, a collecting bus, a first main transformer, a second main transformer, a high-voltage main bus and a high-voltage bus; the collecting bus adopts single bus section connection; one low-voltage side of the first main transformer is connected with a first section of collecting bus, the other low-voltage side of the first main transformer is connected with a second section of collecting bus, one low-voltage side of the second main transformer is connected with a third section of collecting bus, the other low-voltage side of the second main transformer is connected with a fourth section of collecting bus, and the collecting bus is connected with a plurality of offshore fans; the high-voltage sides of the first main transformer and the second main transformer are connected with a high-voltage main bus, and the high-voltage main bus is connected with the high-voltage bus through a submarine cable. The invention can solve the problem of ultrahigh pressure delivery of the large-capacity offshore wind farm and realize the reliability and economy of the system.

Description

Ultra-high pressure sending-out system of offshore wind farm
Technical Field
The invention relates to the technical field of new energy and electric power engineering, in particular to an ultrahigh-pressure delivery system of an offshore wind farm.
Background
In recent years, with the increasing demand for energy, offshore wind power has been widely used. In order to reasonably and effectively develop wind energy, a mode of intensively installing wind turbines is generally adopted to construct a wind farm with ten thousand megawatts or higher installed capacity. Along with the continuous expansion construction of the wind farm on land, the economic benefit of the land wind farm is influenced by wind resource distribution, land area, fatigue load of high turbines and other factors, and further development is difficult to achieve, so that the offshore wind farm becomes a main object of wind farm construction. The capacity and the sending voltage level of the current built offshore wind farm are low, and most of the current built offshore wind farm is 300-400 MW, 220kV and the like, so that the development requirement of the offshore wind farm is difficult to meet. Therefore, how to solve the problem of ultrahigh pressure delivery of the large-capacity offshore wind farm becomes a great difficulty to be solved in the current emergency.
Disclosure of Invention
The invention provides an ultrahigh pressure delivery system of an offshore wind farm, which can solve the problem of ultrahigh pressure delivery of a large-capacity offshore wind farm and realize the reliability and economy of the system.
In order to solve the technical problems, an embodiment of the invention provides an ultra-high voltage delivery system of an offshore wind farm, which comprises a plurality of offshore fans, a collecting bus, a first main transformer, a second main transformer, a high-voltage main bus and a high-voltage bus; the collecting bus adopts single bus section connection;
one low-voltage side of the first main transformer is connected with a first section of the collecting bus, the other low-voltage side of the first main transformer is connected with a second section of the collecting bus, one low-voltage side of the second main transformer is connected with a third section of the collecting bus, the other low-voltage side of the second main transformer is connected with a fourth section of the collecting bus, and the collecting bus is connected with a plurality of offshore fans;
the high-voltage sides of the first main transformer and the second main transformer are connected with the high-voltage main bus, and the high-voltage main bus is connected with the high-voltage bus through a submarine cable.
Further, the offshore wind farm ultra-high voltage delivery system further comprises a first high-voltage reactor and a second high-voltage reactor;
the first high-voltage reactor is arranged at the outlet of the high-voltage main bus, and the second high-voltage reactor is arranged at the inlet of the high-voltage main bus.
Further, the first main transformer and the second main transformer are both in star connection, and both low-voltage sides of the first main transformer and the second main transformer are grounded through resistors.
Further, the first main transformer and the second main transformer both adopt star connection, specifically:
the high-voltage sides of the first main transformer and the second main transformer are all in star connection, and the two low-voltage sides of the first main transformer and the second main transformer are all in star connection.
Further, the offshore wind turbine is a 66kV wind turbine.
Further, the collecting bus is a 66kV bus.
Further, the first main transformer and the second main transformer are both 500/66kV main transformers.
Further, the high-voltage main bus and the high-voltage bus are both 500kV buses.
Further, the submarine cable is a 500kV submarine cable.
Further, the first high-voltage reactor and the second high-voltage reactor are both 500kV high-voltage reactors.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the method comprises the steps of connecting one low-voltage side of a first main transformer with a first section of collecting bus, connecting the other low-voltage side of the first main transformer with a second section of collecting bus, connecting the one low-voltage side of the second main transformer with a third section of collecting bus, connecting the other low-voltage side of the second main transformer with a fourth section of collecting bus, connecting the collecting bus with a plurality of offshore fans, respectively connecting the high-voltage sides of the first main transformer and the second main transformer with a high-voltage main bus, and connecting the high-voltage main bus with the high-voltage bus through a submarine cable to complete the establishment of an offshore wind farm ultrahigh-voltage delivery system. Compared with the prior art, the embodiment of the invention has the advantages that the electric energy generated by the plurality of offshore fans of the offshore wind farm is transmitted to the first main transformer and the second main transformer of the offshore booster station through the collecting buses, the collected electric energy is boosted by the first main transformer and the second main transformer, and then the obtained ultrahigh voltage is transmitted through the high-voltage main buses and the high-voltage buses, so that the problem of ultrahigh voltage transmission of the high-capacity offshore wind farm is solved, the reliability and the economy of the system are realized, and the development requirement of the offshore wind farm is favorably met.
Drawings
FIG. 1 is a schematic diagram of an offshore wind farm ultra-high voltage delivery system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an offshore wind farm ultra-high voltage delivery system according to a second embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First embodiment:
as shown in fig. 1, a first embodiment provides an extra-high voltage delivery system of an offshore wind farm, which comprises a plurality of offshore wind turbines, a collecting bus, a first main transformer, a second main transformer, a high-voltage main bus and a high-voltage bus; the collecting bus adopts single bus section connection; one low-voltage side of the first main transformer is connected with a first section of collecting bus, the other low-voltage side of the first main transformer is connected with a second section of collecting bus, one low-voltage side of the second main transformer is connected with a third section of collecting bus, the other low-voltage side of the second main transformer is connected with a fourth section of collecting bus, and the collecting bus is connected with a plurality of offshore fans; the high-voltage sides of the first main transformer and the second main transformer are connected with a high-voltage main bus, and the high-voltage main bus is connected with the high-voltage bus through a submarine cable.
The extra-high voltage delivery system of the offshore wind farm is a high voltage alternating current delivery system.
In practical application, a topology scheme of a current collecting circuit is designed according to current collecting requirements, a plurality of fan loops are arranged according to a plurality of offshore fans of an offshore wind farm, each fan loop is correspondingly connected into a segmented collecting bus through a fan feeder cabinet, fan connecting cables of the segmented collecting bus are not overlapped in a crossing manner, the segmented collecting bus is correspondingly connected to the low-voltage side of a first main transformer or a second main transformer of an offshore booster station, the high-voltage sides of the first main transformer and the second main transformer are respectively connected to the high-voltage main bus, the high-voltage main bus is connected to the high-voltage bus through a return cable, and the offshore wind farm ultra-high-voltage delivery system is built.
Based on the ultra-high voltage sending-out system of the offshore wind farm, electric energy generated by a plurality of offshore fans of the offshore wind farm is collected through collecting buses and then is transmitted to a first main transformer and a second main transformer of an offshore booster station, the collected electric energy is boosted by the first main transformer and the second main transformer to obtain ultra-high voltage, and the ultra-high voltage obtained by the first main transformer and the second main transformer is collected through the high-voltage main buses and then is transmitted to the high-voltage buses, and the ultra-high voltage is sent out through the high-voltage buses.
In a preferred embodiment, the offshore wind farm ultra-high voltage delivery system further comprises a first high voltage reactor and a second high voltage reactor; the first high-voltage reactor is arranged at the outlet of the high-voltage main bus, and the second high-voltage reactor is arranged at the inlet of the high-voltage bus.
According to the embodiment, the first high-voltage reactor is additionally arranged at the outgoing line of the high-voltage main bus, and the second high-voltage reactor is additionally arranged at the incoming line of the high-voltage bus, namely, the first high-voltage reactor and the second high-voltage reactor are respectively arranged at the two ends of the submarine cable, so that higher harmonics can be effectively restrained and absorbed, closing inrush current and operation overvoltage are limited, a capacitor bank is protected, the voltage waveform of the system is improved, and the power factor of a power grid is improved.
In a preferred embodiment, the first main transformer and the second main transformer are both star-connected, and both low-voltage sides of the first main transformer and the second main transformer are grounded through resistors.
Wherein, first main transformer and second main transformer all adopt star wiring, specifically do: the high-voltage sides of the first main transformer and the second main transformer are all star-shaped, and the two low-voltage sides of the first main transformer and the second main transformer are all star-shaped.
For the current collecting systems with different voltage levels such as 35kV, the existing main transformer generally adopts star-triangle wiring, and as the low-voltage side adopts triangle wiring, a neutral point is required to be led out through the grounding transformer additionally, so that the construction cost and the maintenance cost of the system are increased.
According to the embodiment, the wiring modes of the first main transformer and the second main transformer are changed, so that the star-shaped wiring is adopted on the high-voltage sides of the first main transformer and the second main transformer, the star-shaped wiring is adopted on the two low-voltage sides of the first main transformer and the second main transformer, the two low-voltage sides of the first main transformer and the second main transformer are grounded through resistors, the additional access to the grounding transformer can be avoided, the construction and maintenance cost of an offshore wind farm ultrahigh voltage delivery system is reduced, and the reliability, the safety and the economical efficiency of the system are realized.
Second embodiment based on the first embodiment:
as shown in fig. 2, the second embodiment designs a 500kV send-out system of an offshore wind farm for a 1000MW offshore wind farm with 66kV collector system.
In this embodiment, the offshore wind turbine is a 66kV wind turbine.
In this embodiment, the aggregate bus is a 66kV bus.
According to the embodiment, the 66kV fans are used as offshore fans, the 66kV buses are used as collecting buses, and electric energy generated by the plurality of 66kV fans of the offshore wind farm can be collected by the 66kV buses and then conveyed to the first main transformer and the second main transformer of the offshore booster station.
In this embodiment, the first main transformer and the second main transformer are both 500/66kV main transformers.
In this embodiment, by using a 500/66kV main transformer as the first main transformer and the second main transformer, the collected electric energy can be boosted to 500kV by using the 500/66kV main transformer so as to be sent out to 500kV.
In this embodiment, the high voltage main bus and the high voltage bus are both 500kV buses.
In this embodiment, the submarine cable is a 500kV submarine cable.
In the embodiment, the 500kV bus is adopted as the high-voltage main bus and the high-voltage bus, and the 500kV submarine cable is adopted as the submarine cable for connecting the high-voltage main bus and the high-voltage bus, so that 500kV can be sent out through the lines of the 500kV main bus, the 500kV submarine cable and the 500kV bus in sequence.
In this embodiment, the first high-voltage reactor and the second high-voltage reactor are both 500kV high-voltage reactors.
According to the embodiment, the 500kV high-voltage reactor is adopted as the first high-voltage reactor and the second high-voltage reactor, and the two 500kV high-voltage reactors are respectively arranged at the outgoing line of the high-voltage main bus and the incoming line of the high-voltage bus, namely, the two ends of the sea cable, so that higher harmonics can be effectively restrained and absorbed, closing inrush current and operation overvoltage are limited, a capacitor bank is protected, the voltage waveform of the system is improved, and the power factor of a power grid is improved.
As an example, the capacity of the offshore wind farm of the 66kV current collecting system is 1000MW, several 66kV fans of the offshore wind farm are correspondingly connected to 4 sections of 66kV buses through fan feeder cabinets, the 4 sections of 66kV buses are connected to 2 groups of main transformers of the offshore booster station through 66kV sea cables, that is, each section of 66kV buses is connected to the low-voltage side of the first main transformer or the second main transformer, the high-voltage side winding of the first main transformer adopts star connection, the low-voltage side double split winding also adopts star connection, the capacity is 520MW, the two low-voltage sides of the second main transformer are grounded through resistors, the low-voltage side double split winding also adopts star connection, the capacity is 520MW, the two low-voltage sides are grounded through resistors, the grounding resistor can be 40.4 Ω, the high-voltage side of the 2 groups of main transformers are all connected to the 500kV main buses, that is, the 500kV main buses are connected to the 500kV buses through the 500kV sea cables, that is, the 500kV main buses are grounded through the 500kV sea cables, that is, the 500kV cables are 1×1400mm (1×1400 MW are selected) 2 ) 500kV high-voltage reactors, namely a first high-voltage reactor and a second high-voltage reactor, can be arranged at the outgoing line of the 500kV main bus and the incoming line of the 500kV bus.
Based on 500kV sending-out system of offshore wind farm, electric energy generated by a plurality of 66kV fans of the offshore wind farm is collected through 66kV buses and then is transmitted to 2 groups of main transformers of an offshore booster station, the collected electric energy is boosted to 500kV through the 2 groups of main transformers, 500kV obtained by the 2 groups of main transformers is collected through the 500kV main buses and then is transmitted to a 500kV bus on land through a 500kV submarine cable, and 500kV is sent out through the 500kV bus.
In summary, the embodiment of the invention has the following beneficial effects:
the method comprises the steps of connecting one low-voltage side of a first main transformer with a first section of collecting bus, connecting the other low-voltage side of the first main transformer with a second section of collecting bus, connecting the one low-voltage side of the second main transformer with a third section of collecting bus, connecting the other low-voltage side of the second main transformer with a fourth section of collecting bus, connecting the collecting bus with a plurality of offshore fans, respectively connecting the high-voltage sides of the first main transformer and the second main transformer with a high-voltage main bus, and connecting the high-voltage main bus with the high-voltage bus through a submarine cable to complete the establishment of an offshore wind farm ultrahigh-voltage delivery system. According to the embodiment of the invention, the electric energy generated by a plurality of offshore wind turbines of the offshore wind farm is transmitted to the first main transformer and the second main transformer of the offshore booster station through the collecting bus, the collected electric energy is boosted by the first main transformer and the second main transformer, and then the obtained ultrahigh voltage is transmitted through the high-voltage main bus and the high-voltage bus, so that the problem of ultrahigh voltage transmission of the high-capacity offshore wind farm is solved, the reliability and the economy of the system are realized, and the development requirement of the offshore wind farm is favorably met.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (3)

1. The ultra-high voltage delivery system of the offshore wind farm is characterized by comprising a plurality of offshore wind turbines, a collecting bus, a first main transformer, a second main transformer, a high-voltage main bus, a high-voltage bus, a first high-voltage reactor and a second high-voltage reactor; the collecting bus adopts single bus section connection;
one low-voltage side of the first main transformer is connected with a first section of the collecting bus, the other low-voltage side of the first main transformer is connected with a second section of the collecting bus, one low-voltage side of the second main transformer is connected with a third section of the collecting bus, the other low-voltage side of the second main transformer is connected with a fourth section of the collecting bus, and the collecting bus is connected with a plurality of offshore fans; the first main transformer and the second main transformer are both 500/66kV main transformers;
the high-voltage sides of the first main transformer and the second main transformer are connected with the high-voltage main bus, and the high-voltage main bus is connected with the high-voltage bus through a submarine cable; the high-voltage main bus and the high-voltage bus are both 500kV buses; the submarine cable is 500kV submarine cable; the high-voltage main bus is used for collecting the ultrahigh voltages obtained by the first main transformer and the second main transformer and then transmitting the ultrahigh voltages to the high-voltage bus through a submarine cable;
the first high-voltage reactor is arranged at an outgoing line of the high-voltage main bus, and the second high-voltage reactor is arranged at an incoming line of the high-voltage bus; the first high-voltage reactor and the second high-voltage reactor are both 500kV high-voltage reactors;
the first main transformer and the second main transformer all adopt star connection, the first main transformer with two low pressure sides of second main transformer all are through resistance ground connection, wherein, the first main transformer with the second main transformer all adopts star connection, specifically does:
the high-voltage sides of the first main transformer and the second main transformer are all in star connection, and the two low-voltage sides of the first main transformer and the second main transformer are all in star connection.
2. The offshore wind farm ultra-high voltage delivery system of claim 1, wherein the offshore wind turbine is a 66kV turbine.
3. The offshore wind farm ultra high voltage delivery system of claim 1, wherein the aggregate bus is a 66kV bus.
CN202110470106.8A 2021-04-28 2021-04-28 Ultra-high pressure sending-out system of offshore wind farm Active CN113206513B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204905890U (en) * 2015-08-03 2015-12-23 新疆风电工程设计咨询有限责任公司 Large -scale wind -powered electricity generation field and network system
WO2019138632A1 (en) * 2018-01-10 2019-07-18 株式会社明電舎 Transformer for vacuum capacitor type instrument

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110544580A (en) * 2018-10-31 2019-12-06 中国能源建设集团广东省电力设计研究院有限公司 Main transformer and boosting system of offshore wind power plant boosting station

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204905890U (en) * 2015-08-03 2015-12-23 新疆风电工程设计咨询有限责任公司 Large -scale wind -powered electricity generation field and network system
WO2019138632A1 (en) * 2018-01-10 2019-07-18 株式会社明電舎 Transformer for vacuum capacitor type instrument

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