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Duplex transformer offshore wind power direct current sending-out system and control method

A technology of offshore wind power and DC systems, applied in wind power generation, power transmission AC network, electrical components, etc., to avoid off-grid, improve stability and reliability

Active Publication Date: 2021-09-28
XJ ELECTRIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flexible DC transmission method of offshore wind power has been widely used in Europe, especially in Germany. my country's flexible DC transmission technology started relatively late, but developed rapidly. In order to improve the safety and stability of offshore wind power systems and prevent large-scale wind farms from running off-grid In the event of a power outage, the topology structure and coordinated control method of using double-connected transformers in parallel in offshore converter stations are still blank in China. This invention proposes that offshore converter stations use double-connected transformers in parallel to connect to the DC system.

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  • Duplex transformer offshore wind power direct current sending-out system and control method
  • Duplex transformer offshore wind power direct current sending-out system and control method

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0036] One aspect of the present invention provides a double-connected transformer offshore wind power DC transmission system, including: N wind farm booster stations, AC switch yard stations, two connected transformers and a DC system, N is an integer greater than 1; the N The wind farm booster stations are used to raise the output voltage of the wind turbine to a higher level voltage and send it out. The N wind farm boo...

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Abstract

The invention relates to a duplex transformer offshore wind power direct current sending-out system and a control method, and the system comprises a plurality of wind power plant booster stations which are grouped and accessed to an alternating current switch station, then are connected through two parallel connection transformers, and finally are accessed to a direct current system. When any one of the connected transformers breaks down and quits operation, the surplus power of the other connected transformer is rapidly calculated, the disconnected wind power plant booster station is determined by comparing the surplus power with the output power of the wind power plant booster station, the offshore wind power plant is controlled, the large-area offshore wind power plant is prevented from being off-grid, so the stability and reliability of direct current output of the offshore wind power plant are improved.

Description

technical field [0001] The invention relates to the technical field of offshore wind power, in particular to a dual-connected transformer offshore wind power direct current transmission system and a control method. Background technique [0002] According to the latest data from the Global Wind Energy Association GWEC, as of the end of 2018, the cumulative installed capacity of offshore wind power in the world reached 23.1 million kilowatts, of which the cumulative installed capacity of offshore wind power in China was 4.445 million kilowatts. my country's offshore wind power is also in a leaping development stage from near sea to far sea, from small-capacity wind farms to large-scale wind power bases. The flexible DC transmission method of offshore wind power has been widely used in Europe, especially in Germany. my country's flexible DC transmission technology started relatively late, but developed rapidly. In order to improve the safety and stability of offshore wind power...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/36H02J3/38
CPCH02J3/36H02J3/00H02J3/38Y02E60/60Y02E10/76
Inventor 宋延涛许梦阳吴庆范刘旭辉范雪峰涂仁川王胜李乾吴东崛岳笑歌刘志军王秋开刘晨张绍军罗磊田培涛范子强许朋见王长久卢麒邵静凯李亚锋毛成博范保丰
Owner XJ ELECTRIC
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