How do these giant windmills, which turn day and night, convert wind energy into electricity?
Like airplane wings, wind power generation works by using wind to rotate windmill blades, which in turn drive a generator to produce electricity. While wind turbine blades appear small from the ground, they are actually quite large. Typical wind turbine blades are over 40 meters long, and the largest currently available wind turbine blades exceed 100 meters in length, far surpassing the wing length of a large passenger aircraft. In fact, the wind doesn't "push" the blades; rather, due to the asymmetrical cross-section of the blades, the wind travels at a higher velocity above the blade and a lower velocity below. This results in lower pressure above the blade and higher pressure below, creating a pressure difference that generates lift, causing the wind turbine to rotate.
How do wind turbines ensure power generation? To convert wind energy into electricity, a unique airfoil design alone is far from sufficient. Wind turbines must face the wind to generate electricity. When a wind turbine is operating, it first uses a weather vane to find the wind direction, and then uses a yaw system to rotate the turbine head to face the direction of the wind. Wind is complex, and the turbine frequently measures the wind direction and rotates the turbine head to meet the wind, allowing the turbine to better match the wind's characteristics. As the angle with the wind increases, the power generation also increases rapidly. In addition, the turbine blades also rotate, helping the turbine better adapt to the wind strength.
Traditional wind turbines use wind to rotate the blades, and then use multiple gear sets, such as speed increasers, to drive the generator to produce electricity. This is a long transmission process, and energy loss is inevitable during transmission.
Direct-drive permanent magnet technology eliminates the need for complex transmission structures such as gearboxes, significantly reducing losses, improving power generation efficiency, and ensuring operational reliability. The rotor of a direct-drive permanent magnet generator consists of over 1300 magnets, with core components made of rare-earth materials. It can generate a powerful magnetic field without consuming any electrical energy, ensuring the unit's strong power generation capacity. When wind blows the blades, the coils continuously cut the magnetic field lines, generating electricity. This is how wind energy is converted into electricity.
Can the electricity generated by wind turbines connected to the grid be directly fed into the grid for people's use? For wind power to be safely connected to the grid, the current on the turbine side and the current on the grid side need to be processed by an electrical control box. The voltage generated by the wind turbine is constantly changing, while the grid has strict requirements on the incoming voltage. Therefore, a transformer is needed to process the generated wind power. After processing, all the turbines can output a uniform voltage, and the wind power can be safely transmitted.
