At present, the bottleneck restricting the development of offshore wind energy worldwide remains offshore wind turbines. High reliability and ease of maintenance are the most important properties of offshore wind turbines. Wind turbines with gearboxes of 5 MW and above will be the next development direction of mainstream models.
The global market share of wind turbines with gearboxes is more than 80%. Most of the wind turbine manufacturers in the world, such as: Vestas, GE Wind, Siemens, REpower, Sinovel Wind Power Company, etc., all use this technology.
The method of The direct drive without gearbox is divided into There are two forms: excitation direct drive and permanent magnet direct drive. The German company Enercon, which uses direct drive and excitation gearboxless systems, has around 10% market share ininternational market and its single machine capacity has reached 6MW. However, no units have 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 much more complex, technically difficult and expensive. to build only terrestrial structures. The selection of foundations should comprehensively consider the influence of various factors, mainly water depth, seabed condition, load, construction difficulty and construction cost. At present, single pile steel structure foundations and gravity concrete foundations are mainly used in Europe. China's first demonstration offshore wind farm adopts the world's unique multi-pile concrete cover structure, which is a major innovation in offshore wind power foundation designhore.
Since the magnitude of the wind changes at any time, the output voltage of the generator changes between 13 and 25 and then is rectified. More precisely, there may be a rectifier circuit such as a chopper circuit. it will The output voltage is stable, charging the battery and converting the electrical energy generated by the wind turbine into chemical energy is deliberately misleading. Just like you usually charge a dry battery, the electrical energy is converted into chemical energy and then. electrical energy is converted into chemical energy, then electrical energy is converted into chemical energy. The batteries are all 12V) The output capacity is increased by parallel connection, and the output voltage is increased by series connection (just like series and series connection). parallel connection of dry batteries). So-called mains power is usable electricity, it has no special meaning