Electricity generation methods include: thermal power generation, hydroelectric power generation, nuclear power generation, wind power generation, geothermal power generation, etc.
Power generation refers to the production process of using power generation devices to convert raw energy such as water energy, thermal energy from petrochemical fuels (coal, oil, natural gas), nuclear energy, etc. .in electrical energy.
Electricity generation is used to meet the needs of various departments of the national economy and people's lives.
Nowadays, fossil fuels are still used as the main form of electricity generation, but fossil fuel resources are not plentiful and are becoming increasingly depleted. Human beings have graduallystarted using solar energy, wind energy and geothermal energy. , ocean energy and other energy sources to generate electricity.
General information about offshore and on-shelf wind turbines
The research significance of long-life and high-performance triboelectric nanogenerators is as follows:
1. Solving the energy crisis: Triboelectric nanogenerators can convert clean renewable energy sources such as wind, water, waves and tides into electrical energy, thereby providing a continuous supply of energy resources to humanity.
2. Achieve environmentally friendly and sustainable development: The materials used in triboelectric nanogenerators are environmentally friendly and durable, and can effectively reduce environmental pollution and resource consumption.
3. Meeting the needs of emerging markets: With the popularization of various mobile devices and the development of large-scale intelligent manufacturing, the demand for triboelectric nanogenerators is increasing.
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 drive method direct without gearbox is divided There are two forms: the entexcitation direct drive and permanent magnet direct drive. The German company Enercon, which uses direct drive and excitation gearbox-free systems, has a market share of about 10% in the international market, and its single machine capacity has reached 6 MW. 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 concrete gravity 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 design.