Four-upright semi-submersible type floating wind turbine foundation with ballast

Abstract

The invention discloses a four-upright semi-submersible type floating wind turbine foundation with a ballast. The four-upright semi-submersible type floating wind turbine foundation comprises four uprights, wherein three uprights are side uprights, and the other one is the middle upright. The three side uprights are arrayed at equal intervals to define an equilateral triangle. Each side upright isequipped with a square cabin, and the three side uprights are vertically arranged on the corresponding square cabins. The middle upright is located at the centroid of the equilateral triangle and isequipped with a circular cabin, and the middle upright is arranged on the circular cabin. Each square cabin and the circular cabin are connected through a variable cross-section rectangular buoy. A transition platform is arranged at the connecting position of the top of the middle upright and a tower tube of a wind turbine, an inclined strut is adopted between the tradition platform and each variable cross-section rectangular buoy to transmit the bending moment load of the whole wind turbine, and connecting bridges are arranged between the inclined struts and the variable cross-section rectangular buoys. The four-upright semi-submersible type floating wind turbine foundation with the ballast provides a safe, reliable and cost-controllable offshore supporting structure for large megawatt wind turbine unit (above 7MW), and guarantees stable, safe and reliable operation of the large megawatt wind turbine unit.

Description

technical field [0001] The invention relates to the technical field of offshore wind power foundations, in particular to a four-column ballasted semi-submersible floating wind turbine foundation. Background technique [0002] The development of offshore wind power in my country is moving from prototype testing and small batches to large-scale application. At present, the development of fixed offshore wind farms is in full swing and has become the main battlefield for offshore wind power construction. From the perspective of development, the development of floating offshore wind farms with water depths above 50m will become the "tuyere" of future offshore wind power. [0003] With the increase of water depth, the basic cost of fixed offshore wind turbines rises linearly, the difficulty of construction increases, and the cost of construction and installation increases significantly. Due to the requirements of wind turbine installation accuracy and harsh marine environment con...

AI Technical Summary

Problems solved by technology

[0015] In order to ensure that the foundation’s six-degree-of-freedom response meets the design requirements of the fan unit, the Hywind floating fan foundation is designed to have a deep draft of more than 100m, which cannot be applied to the development of wind resources in sea areas within 50m to 100m; and the installation and transportation need to be transported horizontally to the fan stand Point, and the ballast tank ballast at the machine position to make the wind turbine stand on the sea surface, and then install the wind turbine unit, the installation process is relatively complicated and costly

The WindFloat project uses the same semi-submersible floating fan foundation as this technical solution. The main body is composed of three buoys with a distance of 35m. The fan is installed on one of the buoys. The ballast water is automatically adjusted to resist the wind moment. The positioning system adopts Mooring positioning, the semi-submersible floating fan is installed on one of the buoys, the gravity load acting on the foundation is asymmetrical, it is necessary to adjust the ballast in the three buoys to offset this part of the load, and the wind direction during the actual operation of the fan will change, and the direction of the wind tilting moment on the entire wind turbine will change. It is necessary to dynamically adjust the quantity and distribution of ballast water. Generate uneven loads, reducing the fatigue performance of the foundation structure

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