How much electricity can a wind turbine generate per revolution when it rotates so slowly?

Let's start with the power generation principle of wind turbines.

A wind turbine is composed of basic components such as impellers, nacelle, and tower. The principle of its power generation is very simple: the unit uses wind power to drive the windmill impeller to rotate, converting wind energy into mechanical energy. The generator converts mechanical energy into electrical energy, which is then transmitted to the wind farm booster station through a collection line and then to the power grid, becoming clean wind power for thousands of households.

But a wind farm consists of dozens or even hundreds of windmills, how do so many windmills work?
Each windmill is controlled by the wind farm's "central brain" - the control room, and the staff responsible for the operation of the wind turbines monitor it 24 hours a day to ensure the safety and health of the windmill.

Let's go back to the question at the beginning, how much electricity can a windmill generate by rotating its leaves once?

Under normal circumstances, as long as the wind speed reaches 3 meters per second (the feeling of a gentle breeze brushing the face), the windmill can rotate and generate electricity.

Taking a 1500kW fan unit as an example, the blade length of the unit is about 35 meters (approximately 12 stories high). The wind turbine rotates for about 4-5 seconds per week (but the blade tip speed can reach 280 kilometers per hour, equivalent to the speed of high-speed railways), and can generate about 1.4 kWh of electricity. Under normal full power conditions, the daily electricity generation can supply 15 households for one year. This type of wind turbine can reduce emissions of 3000 tons of carbon dioxide, 15 tons of sulfur dioxide, and 9 tons of nitrogen dioxide annually.

Like the wind farm in the western mountainous area of Huangyan, the project has a total land area of 1.6727 hectares, 28 wind turbines with a single capacity of 1500 kilowatts, a total installed capacity of 42000 kilowatts, and an annual grid connected electricity of 84.14 million kilowatt hours.

Is a larger wind turbine better?

According to the law of conservation of energy, the higher the wind speed, the more electricity is provided. However, when the wind speed reaches a certain value, our wind energy converter will be damaged due to excessive strength. In fact, power generation does not depend on the speed of the blades.

Because there is a device in the wind turbine that is similar to a car gearbox, such as the gearbox in first gear, even if the blade speed is very fast (equivalent to stepping on the accelerator to the end), the transmission to the generator device through the gearbox is still at a relatively constant low speed (equivalent to the car still not running fast). With such a device, directional changes also provide protection. When the blade speed is constant, the force on the blade increases and the power increases. The larger the fan blades, the greater the power, and the corresponding amount of electricity generated.

Then the question arises again, does the wind not obey and only blow in one direction?

Don't worry, the wind turbine head integrates sensors and yaw systems. Once the wind vane and anemometer collect changes in wind direction and speed, the yaw system will urge the yaw motor to adjust the position of the engine compartment to align smoothly with the wind direction and maximize the use of wind energy.
Wind power generation can be divided into onshore and offshore.

Wind power is also divided into onshore wind power and offshore wind power. Huangyan Budai Mountain, Cangshan Mountain, and Wenling Donghaitang belong to onshore wind farms, while Jiaojiang Dachen Island Wind Farm and Yuhuan Kexiao Wind Farm are typical offshore wind farms.

There is a significant difference in construction costs between the two. Generally speaking, the construction cost of offshore wind farms is twice that of onshore wind farms, and the operation and maintenance cost is 2-4 times that of onshore wind farms. This is mainly due to poor offshore construction conditions and high construction difficulty. Offshore wind power is far away from the shore, and adverse sea conditions such as typhoons and storms can also have a significant impact on wind power operation and maintenance.

Why continue to develop wind power offshore?

The vast ocean and abundant wind energy resources. Offshore wind power has high utilization hours, does not occupy land, and does not consume water resources. Suitable for large-scale development, the power generation efficiency is generally 20% -40% higher than onshore wind power. In other words, the potential is' leveraged '. There is great potential for achieving carbon peak in the wind power industry.
Wind energy is a renewable energy source that is very environmentally friendly. Moreover, wind energy facilities have little impact on the ecological environment. Although the initial investment is relatively large, compared with hydropower and thermal power, the maintenance and management costs in the later stage are extremely low. It is one of the most mature, large-scale, and commercially developed power generation methods in the field of new energy technology.

However, wind is an intermittent renewable energy source, and its power undergoes significant changes in a short period of time, but remains relatively stable over a long period of time. This makes wind power generation unable to increase or decrease power generation as needed, nor can it serve as a basic negative source. Therefore, wind power generation must be used in conjunction with other power sources or storage facilities to provide stable power. With the increase of wind power generation in the region, more conventional energy sources such as thermal power and nuclear power may be needed as backup or to upgrade the power grid.

However, power management technology can be used to address these issues, such as scheduling different renewable energy sources and geographically distributed generator sets, importing and exporting power sources, and storing energy. Therefore, power grid companies are exploring how to achieve large-scale consumption of new energy.

Zhejiang State Grid Electric Power proposes to build a diversified and highly elastic power grid in the form of energy internet, accelerate the construction of energy storage, realize the efficient interaction of "source network, load storage", and solve the problem of new energy consumption. Accompanied by. The "30-60 Goal" encourages the development of new energy at the national level, providing a good opportunity for the large-scale development of wind power.