At present, the bottleneck restricting the development of offshore wind power around the world is still offshore wind turbines. High reliability and ease of maintenance are the most important properties of offshore wind turbines. Wind turbines with gearboxes of 5MW and above will be the next development direction of mainstream models.
The global market share of wind turbines with gearboxes is over 80%. Most wind turbine manufacturers in the world, such as: Vestas, GE wind, Siemens, REpower, Sinovel Wind Power Company, etc., all use this technology
The direct drive method without gearbox is divided into There are two forms: excitation direct drive and permanent magnet direct drive. The German Enercon company, which uses excitation direct drive gearboxless systems, has about 10% market share in the international market, and its single machine capacity has reached 6MW. However, no unit has yet been put into the sea
In order to withstand the strong wind load, seawater corrosion and wave impact at sea, the foundation of offshore wind turbines is far more complex, technically difficult and costly to construct than onshore structures. The foundation selection must comprehensively consider the influence of various factors, mainly water depth, seabed conditions, load, construction difficulty, and construction cost. At present, single-pile steel structure foundations and gravity concrete foundations are mostly used in Europe. China's first offshore demonstration wind farm adopts the world's unique multi-pile concrete cap structure, which is a major innovation in offshore wind power foundation design.