Offshore wind turbine grid connection method and system

Abstract

The invention discloses an offshore wind turbine grid connection method. The method includes the steps that after an offshore wind turbine converts wind energy into alternating current, the alternating current is boosted to proper voltage through a boosting transformer and connected to an alternating current bus; the alternating current bus collects the alternating current boosted by the boosting transformer; an offshore convertor station converts the alternating current collected on the alternating current bus into direct current; a submarine cable transmits the direct current converted by the offshore convertor station in a long distance; a land convertor station converts the direct current transmitted through the submarine cable into alternating current; a main transformer converts the alternating current converted through the land convertor station into a proper voltage grade, and the alternating current is connected into a main power grid. The invention further discloses an offshore wind turbine grid connection system. The problems existing in grid connection of an offshore wind plant with the long distance and large capacity are solved.

Description

technical field [0001] The invention relates to the technical field of new energy sources in electric power systems, in particular to a grid-connected method and system for offshore wind turbines. Background technique [0002] Wind power generation technology is currently one of the most effective and fastest-growing power generation technologies in renewable energy generation. Among them, compared with onshore wind farms, offshore wind farms have several unique advantages, which will be the general trend of wind power development in the future. [0003] The advantages of offshore wind farms are mainly manifested in the following aspects: (1) The wind speed at sea is higher and more stable than that on land; (2) Land resources are saved and noise is reduced; (3) Sea level friction is small, which can prolong the service life of equipment (4) The wind shear is small and does not require a very high tower, which can reduce the cost of the wind turbine. [0004] At present, d...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and system for grid connection of offshore wind turbines to solve the problem of grid connection of offshore wind farms with relatively long distances from the shore and large capacity.

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