The methods for offshore wind power stations to generate electricity at night include energy storage, shutdown, and connection to the power grid.
1. Energy storage: Use energy storage technology to store excess electricity generated by wind power during the day for use at night. Currently commonly used energy storage technologies include battery energy storage, compressed air energy storage, water pump energy storage, etc.
2. Shutdown: Stop the operation of wind turbines at night to avoid waste and loss of power. However, this method will affect the operating efficiency and economic benefits of the power station, so it is not the optimal treatment method.
3. Connect to the power grid: Connect the power generated by wind power generation at night to the power grid for use in surrounding areas. This method requires connecting offshore wind power stations to onshore power grids for dispatching and management, which can improve the utilization rate and economic benefits of the power stations, but factors such as the stability and security of the power grid need to be considered.
Why do wind power stations significantly increase the temperature in local areas?
1. Wind power generation will harm the local ecological environment, such as destroying vegetation, changing the topography, causing soil erosion and desertification.
2. The electromagnetic radiation produced by wind power generation affects human habitation. In wind power generation systems, generators, substations, transmission lines, etc. are the main causes of electromagnetic radiation. When the receiving device attached to the wind farm receives the signal, it will receive the electromagnetic wave signal reflected by the wind turbine blades.
The reflected signal is a lagging signal, which can have a greater impact on the AM radio system; at the same time, the rotation of the turbine blades will also produce a phase-shift signal, which can have an impact on the FM radio system. The material the blades are made of will also interfere with electromagnetic waves. If the blades are made of metal materials, it will cause serious electromagnetic interference.
In addition, an alternating electromagnetic radiation field will be formed around high-voltage transmission lines, causing electrostatic induction relative to the ground, causing interference to radio and affecting human health.
3. Wind power affects local climate. Wind power uses wind energy in the atmosphere. According to the law of conservation of energy, the consumption and production of one kind of energy must produce or consume another kind of energy. Therefore, wind turbines The power generation process 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.
When some offshore wind farms and inland ridge wind farms are operating, if the humidity is relatively high, a huge water vapor tail will condense behind the wind turbine, which may affect the local microclimate, such as humidity, sand and dust. Subsidence has an impact.
4. Damage to the wind turbine blades is prone to accidents. When the wind turbine blades are subjected to strong winds above 25m/s (cut out wind speed), although the wind turbine is in a shutdown state, However, due to the limited bending moment, torque, shear strength, and extrusion strength that the blade root can bear, in severe cases, the entire blade can fly out.
Causing casualties and building damage on the road (although wind turbines are mostly located in coastal areas with sparsely populated areas). Apart fromExtreme winds, blade surface corrosion, lightning strikes, ice coating, cracks, etc. can easily cause blade breakage, causing accidents and affecting public safety.
5. The noise hazards of wind power generation. For such a large wind turbine, when the huge blades rotate (one blade requires a special bendable long truck to be transported), it Noise is inevitable.
The noise from wind blades can be roughly divided into three categories.
1. Thickness noise, which is produced by the squeezing of air and blades. In windy weather, when we close the doors and windows, do we often hear a sharp and harsh sound, which feels like a ghost crying or a wolf howling? , coupled with the gloomy sky outside, it is still a bit scary to think about it.
2. Load noise, as the name suggests, is caused by the blades bearing a large load.
3. Impulse noise is generated when the Mach number is close to 1. In this way, the impact of noise on the environment cannot be ignored.
Extended information
Hazard response measures:
1. Wind power generation construction requires preliminary planning. It should be far away from residential areas and avoid ecologically sensitive areas.
2. Improve the design level of wind power generation so that it can be well integrated into the environment.
3. When developing wind power generation, environmental, economic, and social effects need to be comprehensively considered, and one cannot ignore the other. The impact on the environment needs to be reasonably considered from both positive and negative aspects.
Baidu Encyclopedia-Wind Power
A study by a research team from Harvard University in the United States shows Wind power does not have any negative impact on the environment as people imagine. First of all, wind power stations, hundreds of meters in diameter, will pose a direct threat to the lives of migrating birds. Birds die on wind turbines every year. Thousands. In addition, after the separation generator reaches a certain density, it will also affect the hot and cold airflow in the atmosphere, causing direct changes in the local climate.
In the atmosphere, the hot air balloon is in the upper layer and the cold air is in the lower layer. The wind power station will bring the hot air balloon to the ground, causing the ground to quickly heat up. The temperature rise can even reach 1.4℃. In fact, if you If you live in an area near wind turbines, you may be susceptible to this change. When you stand under rows of instantaneous separation generators, you will feel a significant increase in temperature. According to estimates by experts from Harvard University, if all energy supply in the United States adopts wind power, the average temperature in the United States will be at least will rise by at least 0.25℃.
However, Harvard University’s research seems to provide more reasons for restarting the development of coal resources in the United States. Currently, wind turbines in the United States only account for 6.5% of the total energy. It is unrealistic to use partial power generation. In addition, partial power generation only changes the air flow, and it is temporary and regional, while the global warming caused by burning fossil energy is permanent.It is permanent, global and even irreversible, so so far wind energy is still a clean energy worth promoting.
In meteorology, the airflow is preheated, and the rising airflow becomes colder and sinks, so the cold air is below and the hot airflow is above, but the generator blades that are hundreds of meters high bring the hot airflow down to the ground. heat up. The effect of one wind turbine is not obvious, but when you are under a row of wind turbine arrays with a depth of more than 10 kilometers, the feeling must be very strong. The measuring instrument shows that the temperature at night will be 1℃ higher, but this The temperature increase is short-lived and recoverable.