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Offshore platform for offshore wind power flexible direct current connecting-in system

A flexible DC and access system technology, applied in wind power generation, power transmission AC network, DC network circuit devices, etc. , offshore platform design research and other issues, to achieve the effect of easy on-site debugging and maintenance, simple and convenient wiring, and reducing electromagnetic interference

Active Publication Date: 2015-05-27
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost of offshore platforms, there are strict size requirements for the layout of offshore platforms
At present, there are no engineering examples of offshore platforms used for offshore wind power flexible DC access systems in China, and there is no research on offshore platform design for offshore wind power flexible DC access systems. Therefore, it is of great significance to carry out this research

Method used

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  • Offshore platform for offshore wind power flexible direct current connecting-in system
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  • Offshore platform for offshore wind power flexible direct current connecting-in system

Examples

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Effect test

Embodiment 1

[0021] Such as figure 1 As shown, Embodiment 1 of the present invention is aimed at the offshore power transmission end of the 600MW offshore wind power flexible DC access system. The offshore power transmission end of the system includes the AC system of the offshore wind farm and the offshore converter station. The AC system of the offshore wind farm gathers the 35kV AC power of the offshore wind farm and transmits it to the offshore converter station through the AC main transformer incoming line. The offshore converter station includes split transformers and converters, where the converters adopt a symmetrical unipolar MMC topology. In the symmetrical unipolar MMC topology, there are 6 sets of valve tower arrays. Each valve tower A is connected in series with 6 sets of bridge arm reactors B respectively to form 6 sets of bridge arms. The ends of the three groups of valve towers in the arm are connected in parallel, and finally form ±200kV direct current and send it out t...

Embodiment 2

[0028] Such as figure 2 As shown, Embodiment 2 of the present invention is aimed at the offshore power transmission end of the 1000MW offshore wind power flexible direct current access system. The power transmission end of the system is similar to the 600MW offshore wind power flexible DC access system, including the AC system of the offshore wind farm and the offshore converter station. The AC system of the offshore wind farm raises the collected 35kV AC power of the offshore wind farm to 220kV through the offshore step-up station, and then sends it to the offshore converter station. The offshore converter station includes two sets of converter transformers and offshore converters. The offshore converter uses two sets of symmetrical unipolar MMC converters connected in series to form a symmetrical bipolar MMC topology, and the midpoint of the two sets of MMC converters is located at Grounding creates zero potential. The 220kV AC power of the AC system is rectified by two M...

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Abstract

The invention relates to an offshore platform for an offshore wind power flexible direct current connecting-in system. The offshore platform is characterized by comprising a combined steel structure building divided into an upper layer and a lower layer, wherein each layer of steel structure building consists of a plurality of function rooms, in addition, the bottom of each layer of steel structure building adopts a plurality of steel plates for forming decks, the offshore platform is totally provided with two layers of decks including the upper layer of deck and the lower layer of deck, a bridge arm reactor region, a current converter valve hall, a direct current reactor region and a control chamber region are arranged on the lower layer of deck, and the upper layer deck is provided with a connecting transformer region, an alternating current connecting-in region, a control and auxiliary facility region, a 35kV alternating current power distribution device region, a valve cooling heat radiation region and an auxiliary facility region. The alternating current electric energy of an offshore wind power plant is gathered into the 35kV alternating current power distribution device region through a cable, passes through the alternating current connecting-in region and is then conveyed into the connecting transformer region for voltage boosting, the electric energy is conveyed to the bridge arm reactor region of the lower layer of deck through the cable and is subjected to current conversion through electric equipment in the current converter valve hall, and then, the direct current electricity is output through electric equipment in a direct current plant connecting-out region. The offshore platform can be widely applied to the offshore platform design in an offshore wind power flexible direct current connecting-in system.

Description

technical field [0001] The invention relates to the field of new energy and power systems, in particular to an offshore platform used for an offshore wind power flexible DC access system. Background technique [0002] With the increasing capacity of wind power generation, more and more wind power generation is connected to the grid, and the grid-connected operation of wind power has become the most effective way to utilize wind energy on a large scale. As the transmission distance needs to be farther and the transmission capacity needs to be larger, DC transmission can well make up for the shortage of AC transmission and better adapt to the development needs of offshore wind power. Moreover, compared with conventional HVDC, two-level and three-level voltage source converters (VSC-HVDC), the flexible DC access system for offshore wind power based on modular multilevel converters is more suitable for long-distance , Large-scale offshore wind power access system. [0003] How...

Claims

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Application Information

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IPC IPC(8): E04H5/04H02J1/00H02B7/06H02B1/30H02B1/56
CPCE02B17/00E04H5/04H02J3/36H02M7/003Y02E10/76
Inventor 袁兆祥胡劲松齐立忠张军胡君慧吴金龙谢特列张哲郄鑫王先为邹辉叶军苟晓彤
Owner STATE GRID CORP OF CHINA
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