Does wind really "blow" the blades to generate electricity?

Question

Accepted Answer

How do these large windmills that we see turning day and night convert wind energy into electrical energy?

like airplane wings, the principle of wind turbine is to use wind to drive the windmill blades to rotate, and then drive the generator to generate electricity. Wind turbines' leaves look smaller from the ground, but in fact they are very large, the ordinary ones are more than 40 meters long, and the largest ones length of the blades has exceeded 100 meters at present, far exceeding the length of the wings of large passenger aircraft. In fact, the wind does not "push" the wind turbine blades, but because the shape of the blade cross-section is asymmetrical up and down, flow speed of wind is high when it passes above the blades, which below is smaller. This will cause the pressure above the blade to be small and the pressure below to be strong. The blade will form a pressure difference between the upper and lower parts of the blade. This pressure difference will generate lift, causing the wind wheel to rotate.

How does a wind turbine ensure power generation?

To convert wind energy into electrical energy, unique airfoil design alone is not enough. Windmill must face the wind to generate electricity. When the wind turbine is working, it first finds the direction of the wind through the wind vane, and then rotates the nose of the aircraft to the direction facing the wind through the yaw system. Wind is very complex. The wind turbine will often measure the wind direction and rotate its head to face the wind, so that the wind turbine can better match the characteristics of the wind. As the angle to the wind increases, the power generation power will also increase rapidly. In addition, the fan blades will also rotate to help the fan better adapt to the wind.

Traditional wind turbines use wind to drive the windmill blades to rotate, and then increase the rotation speed through multiple gear sets such as speed increasers to drive the generator to generate electricity. This is a very long transmission process, and energy will inevitably be lost during the transmission process.

Direct-drive permanent magnet technology eliminates the need for complex transmission structures such as gearboxes, greatly reduces losses, improves power generation efficiency, and ensures operational reliability. The rotor of the direct-drive permanent magnet power generation is composed of more than 1,300 magnets, and the core components are composed of rare earth materials. It can generate a strong magnetic field without consuming any electric energy, ensuring the unit's strong power generation capacity. When the wind blows the blades, the coils continuously cut the magnetic field lines to generate electricity. This is how wind energy is converted into electricity.

Emitted by wind turbines connected to the grid electricity, can it be directly fed into the power grid for people to use? If you want to safely integrate wind power into the grid for people to use, the wind turbine side current and the grid side current need to be processed by the electrical box. The voltage generated by the wind turbine is constantly changing, and the electricity for using from grid has strict requirements on the incoming voltage. At this time, a transformer is needed to process the wind power that has been generated. After processing, all units can output a unified voltage, and wind power can be transmitted safely.