Generally speaking, the third-grade wind is valuable. However, from an economic and reasonable point of view, the wind speed is greater than 4 meters per second for power generation.
According to the measurement, when the wind speed of a 55kW wind turbine is 9.5m per second, the output power is 55kW. When the wind speed is 8 meters per second, the power is 38 kilowatts; When the wind speed is 6 meters per second, it is only 16 kw; When the wind speed is 5 meters per second, it is only 9.5 kilowatts. It can be seen that the greater the wind, the greater the economic benefits.
Extended data
Wind turbine is an electrical equipment that converts wind energy into mechanical work, drives the rotor to rotate and finally outputs alternating current. Wind turbine is generally composed of wind wheel, generator (including device), direction regulator (tail wing), tower, speed limit safety mechanism and energy storage device.
The working principle of wind turbine is relatively simple. The wind wheel rotates under the action of wind power, which converts the kinetic energy of the wind into the mechanical energy of the wind wheel shaft, and the generator is driven by the wind wheel shaft to rotate to generate electricity. In a broad sense, wind energy is also solar energy, so it can also be said that wind turbine is a kind of thermal energy utilization generator with the sun as the heat source and the atmosphere as the working medium.
For many centuries, wind turbines, like hydraulic machinery, have played an important role in the development of productivity as a power source to replace human and animal power. The wide application of modern electromechanical power and the discovery of Middle East oil fields in 1950s slowed down the development of wind turbines.
In the early 1970s, due to the "oil crisis", there was a problem of energy shortage. People realized the instability and limitations of conventional mineral energy supply, so seeking clean renewable energy became an important topic in the modern world. As a renewable and pollution-free natural energy, wind energy has once again attracted people's attention.
References:
Baidu encyclopedia-wind turbine