Wind power is unstable, as everyone knows, and is obviously affected by the strength of the wind. Therefore, in order to ensure stable output of wind power, it is usually necessary to equip corresponding thermal power plants according to the scale of wind power for peak shaving. Such a large-scale development of wind power has made it difficult for thermal power stations to keep up.
In addition, electricity is transmitted from the power station to the user through the power grid. At present, the State Grid cannot withstand the impact of such a large-scale wind power grid. It seems that the professional saying is that wind power will cause grid shock and lead to off-grid. Because the places where wind power is generated are basically sparsely populated places with little electricity consumption, while places with dense population and large electricity consumption do not have such strong wind power, so they are not suitable for wind power generation.
Therefore, wind power must face the problem of long-distance transmission. At present, the power grid is a big obstacle. From the perspective of the State Grid, there is no motivation to carry out technological transformation or innovation for wind power, and long-distance power transmission may not be cost-effective.
The final result is that there are so many windmills standing on the Gobi Desert basking in the sun. Even if some windmills are spinning, most of them are idling there. Once the electricity is generated, it cannot be transported out and cannot be stored, so what is its use?
These issues should have been systematically considered at the beginning of the planning, but various departments and certain leaders, for their own purposes, worked hard and quickly. The leaders were eager to achieve political achievements and results, and the enterprises Some do it to earn subsidies. In short, due to various subjective factors, they do many things that do not respect objective laws. As a result, people and money are wasted, and I don’t know who will wipe the butt behind?
Factors affecting wind power
Generally, the equivalent utilization hours of wind turbines = annual total power generation/unit rated power. In the above formula, the unit The rated power is determined, and the directly affected data is the "annual total power generation". For this data, the following are the main influencing factors:
1. Meteorological data, including wind conditions, climate, and natural disasters Impact;
2. The failure rate of the unit and the reliable operation time of the unit;
3. Substation restrictions in the area where the wind farm is located, this is a very important influencing factor now;
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4. On-site losses, including variable losses, line losses, reactive power, etc.
5. Others
Four major hazards of wind power generation
The factors that affect wind strength include air pressure difference, topography, air pressure difference, typhoons and hurricanes, etc.
1. Air pressure difference: Air pressure difference is an important factor affecting the strength of the wind. When there are differences in air pressure across areas, the air pressure difference will cause air to flow from areas of high pressure to areas of low pressure, thus forming winds. The greater the air pressure difference, the greater the wind force.
2. Terrain: Terrain also has an important influence on the size of the wind. For example, valley breeze, sea breeze, and land breeze are all related to topography. In valleys, winds are blocked and accelerated by terrain, whereas over oceans and land, winds areto the effects of different temperature and humidity conditions.
3. Air pressure difference: Friction will hinder the flow of air, thereby reducing wind force. Vegetation, buildings and other objects on the ground all create friction, so winds tend to be stronger in areas with sparse vegetation and dense buildings. In addition, friction in the atmosphere also affects the strength of the wind.
4. Typhoons and hurricanes: When warm and moist airflow encounters cold air, and under certain meteorological conditions, typhoons or hurricanes will form. The wind force of these extreme weather phenomena is extremely strong, which can reach level 12 or above.
The impact of wind power invention on life:
1. Energy supply: Wind power is a renewable energy source that does not rely on fossil fuels. Therefore, greenhouse gases and other harmful substances are not produced. The promotion and application of wind power increases the diversity of energy supply, reduces dependence on traditional energy, and helps mitigate global climate change.
2. Environmental protection: Wind power is a clean energy source that does not produce noise or pollutants and has little impact on the environment. Compared with traditional energy, wind power can reduce the consumption of natural resources, reduce damage to the environment, and make our lives more environmentally friendly.
3. Economic impact: The promotion and application of wind power generation also has a positive impact on the economy. First, the manufacturing and installation of wind power equipment requires a large amount of labor, which can provide more employment opportunities for the job market. Secondly, the operation and maintenance of wind power generation requires professional technical personnel, which can provide more employment opportunities for technical talents. The development of wind power has also promoted the development of related industries, such as wind power equipment manufacturing, wind power technology research and development, new energy services, etc., injecting new impetus into economic development.
The four major hazards of wind power generation: noise hazard, damage to the landscape, interference to wildlife, and impact on the local climate.
1. Noise hazard: In fact, wind turbines will indeed cause many unavoidable hazards during operation. However, for the utilization and development of any kind of energy, there may be many Either way it will cause some harm to nature.
2. Damage to the landscape: Because wind turbines are usually large and need to be built in open areas, they often destroy beautiful mountains, beaches, and farmland. This will not only affect the living environment of local residents, but also have a negative impact on the tourism industry. Many attractions have become difficult to appreciate due to the construction of wind turbines, and this is an issue that needs attention.
3. Interference with wild animals: The low-frequency noise and electromagnetic radiation of generators may disrupt the life and migration habits of sensitive animals. Some studies suggest that the operation of wind turbines can cause nearby wildlife to decline or migrate elsewhere in search of safe habitat.
4. Impact on local climate: Wind power uses wind energy in the atmosphere. According to the law of conservation of energy, a consumption of energyIt is necessary to produce or consume another kind of energy. Therefore, the power generation process of wind turbines must consume part of the wind energy in the atmosphere. As one of the important factors of climate change, wind energy changes will inevitably bring about climate changes.
The working principle of wind power generation
Convert the kinetic energy of the wind into mechanical kinetic energy, and then convert the mechanical energy into electrical kinetic energy. This is wind power generation. The principle of wind power generation is to use wind power to drive the windmill blades to rotate, and then use a speed increaser to increase the speed of rotation to prompt the generator to generate electricity. According to windmill technology, power generation can begin at a breeze speed (the degree of breeze) of approximately three meters per second.
The devices required for wind power generation are called wind turbines. This kind of wind turbine can be roughly divided into three parts: wind wheel (including tail rudder), generator and tower. Large-scale wind power stations basically do not have tail rudders, and generally only small ones (including household types) have tail rudders.
The wind wheel is an important component that converts the kinetic energy of the wind into mechanical energy. It is composed of several blades. When the wind blows towards the blades, aerodynamic force is generated on the blades to drive the wind wheel to rotate. The blade material requires high strength and light weight, and is often made of fiberglass or other composite materials (such as carbon fiber).