1. (1) Advantages of wind energy: huge potential, wide distribution, renewable and pollution-free.
(2) Disadvantages of wind energy: low density, instability, large regional differences, wide dispersion of wind energy, randomness and low energy density!
2. Wind power generation: The advantages of large-scale systems are high reliability of power supply to the system and low operation and maintenance costs. The disadvantage is the high cost of the system. .
The advantages of this small system are that it produces higher power, lower system cost and lower operation and maintenance costs.
The disadvantage is that small wind turbines have low reliability. .
..Due to the strong complementarity between solar energy and wind energy, wind and solar hybrid power generation systems make up for the lackresources of wind energy and independent photovoltaic systems
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Wind engine is an energy conversion device that converts wind energy into mechanical energy.
As shown in Figure 1-4, the wind engine consists of 5 parts: ...The disadvantage is that it is difficult to start. ...The capacity of small wind turbines is not large, and the power generally ranges from a few watts to several kilowatts. Most of them have the advantages of simple structure and easy transportation. ...In the use of wind energy, energy storage is an important issue. ...
3. The advantages of wind power generation are:
The cost of solar power generation is too high and the technological content is high. Energy production will be affected when solar energy production is affected. the weather is bad;
For the production of energywind turbine, the worse the weather, the stronger the wind and the better the electricity production.
Principles of wind power generation and solar power generation
A wind turbine tower generates approximately 0.1 kilowatt hours of electricity at its speed nominal, a 100 kW wind turbine generates. electricity per revolution, or 0.1 kilowatt-hour of electricity. When wind power is sufficient and stable, a 2 MW direct drive wind power generator can produce 2,000 kilowatt hours of electricity every 60 minutes.
It takes 3.5 seconds for the fan blades to rotate once. Wind turbines between 50 W and 300 W are 12 V, wind turbines between 300 W and 800 W are 24 V wind turbines, and wind turbines over 800 W are generally over 36 V wind turbines.
< p>A wind turbine is an electrical device that converts wind energy into mechanical work. Mechanical work causes the rotor to rotate and pultimately produces alternating current. Its operating principle is relatively simple. It uses the sun as heat. source and atmosphere as operating principle. The thermal energy from the environment is used by the generator. As an energy source replacing human and animal energy, it plays an important role in developing productivity. Wind power generation often has no fuel concerns and generally does not produce radiation or air pollution. Generator types include asynchronous, synchronous, horizontal and vertical axes.How many kilowatt hours of electricity can wind power produce in a single cycle?
1. Wind Turbine
Wind turbines can be divided into DC generators and AC generators.
1. DC generator: A DC generator is mainly composed of generator shell, magnetic pole core, magnetic field coilmagnetic, an armature and a carbon brush (as shown in Figure 1). Working principle of power generation: When the wind rotates the armature of the generator, the generatorThere is residual magnetism in the core of the magnetic pole, so the armature coil cuts the magnetic lines of force in the magnetic field. According to the principle of electromagnetic induction, current is generated by magnetic induction and produces current through the carbon brush.
2. Alternator: The alternator is mainly made of magnetic materials with several permanent magnets (called rotors) arranged alternately between the north and south poles and an armature coil made of cast silicon and wound with several sets of series. coils (called stators). Working principle of power generation: The rotor is driven by the wind to axially intersect the magnetic lines of force. The magnetic poles arrangeds alternating in the stator form an alternating magnetic field in the coil core. When the rotor rotates once, the direction and size are changed. of the magnetic flux changes several times. Due to the transformation of the magnetic field, an induced current varying in magnitude and direction will be generated in the coil and delivered through the stator coil. ?
2. Solar power generation
Solar power generation methods There are two solar power generation methods, one is light-heat-electricity conversion method and the other is light . -Direct electricity conversion method. ?
1. The light-heat-electricity conversion method uses thermal energy generated by solar radiation to produce electricity. Generally, a solar collector converts the absorbed thermal energy into steam as the working fluid and then drives it away. a steam turbine to produce electricitye. At present, it can only be used on a small scale on special occasions, and large-scale use is not economically profitable and cannot compete with ordinary thermal or nuclear power plants. ?
2. Direct light-to-electricity conversion method This method uses the photoelectric effect to directly convert solar radiation energy into electrical energy. The basic device for converting light into electricity is the solar cell. Sunlight shines on the p-n junction of the semiconductor, forming new hole-electron pairs. Under the action of the electric field of the p-n junction, holes flow from region n to region p and electrons flow from region p to region n. region. After the circuit is turned on, a current is formed. This is how photovoltaic solar cells work. Solar cells are a new spromising energy source with the three major advantages of permanence, cleanliness and flexibility.
Does anyone know how many meters the blades of a wind turbine are typically? p> h3>
A wind turbine can generate 1.96 kWh of electricity when it spins once.
Different motors have different power ratings. When wind power is relatively stable, it can generally generate 2,000 degrees of electricity in 60 minutes, on average, it can generate 0.56 degrees of electricity per second. and a turn The amount of electricity that can be generated is 1.96 kWh. Of course, this data is not completely accurate and will be affected by the influence of wind and the stresses of the generator itself. Solar energy technology is not sufficiently mature and has not been used on a large scale due to its relatively high level. cost.
But many people are stillmade in research in this energy field, and this energy will also bring great changes to people's lives in the future. In the future, those with low conversion rates will. harmful to the environment. There will also be negative effects on how electricity production will be gradually changed.
The principle of wind power generation
The principle of wind power generation is to use wind energy to rotate the blades of the wind turbine, then increase the rotation speed using a speed multiplier to cause the generator to produce electricity. The leaves are used to collectIt receives the force of the wind and converts it into electrical energy through the nose. The tail keeps the blades facing the direction of the incoming wind to obtain maximum wind energy. The rotor allows the nose to rotate flexibly to realize the function of adjust the direction of the wind. tail. The nose rotor is a permanent magnet. The stator windings cut the magnetic field lines to generate electrical energy.
As the wind volume is unstable, the wind turbine produces 13-25V alternating current, which needs to be rectified by the charger, and then the battery is charged, so that the electrical energy generated by the wind turbine is converted into chemical energy. Then use an inverter with a protection circuit to convert the chemical energy of the battery into AC 220V mains power to ensure stable use.
The length of the blades should be judged according to theinstalled capacityof the fan, such as V80, V52, S70 among. the above three models, the blade lengths are 39 meters, 25 meters and 34 meters respectively. The installed capacities are 1500, 850 and 1500 respectively. Therefore, the length of the lsoul should be judged according to the actual situation.
A wind turbine is an electrical device that converts wind energy into mechanical work. The mechanical work causes the rotor to rotate and ultimately produces alternating current. Wind turbines generally consist of components such as a wind wheel, a generator (including devices), a steering (tail), a tower, a speed-limiting safety mechanism, and an energy storage device.
The operating principle of a wind turbine is relatively simple. The wind wheel rotates under the influence of the wind. It converts the kinetic energy of the wind into the mechanical energy of the wind wheel shaft. driving the wind wheel shaft to produce electricity. Generally speaking, wind energy is also solar energy, so we can also say that a wind turbine is a generator using thermal energy that uses the sun to cosame heat source and the atmosphere as working fluid.
For many centuries, wind turbines, like hydraulic machines, have played an important role in the development of productivity as a source of energy to replace human and animal energy. The widespread application of electromechanical power in modern times and the discovery of oil deposits in the Middle East in the 1950s slowed the development of wind turbines.
In the early 1970s, due to the “oil crisis”, energy shortages appeared. People have become aware of the instability and limitations of conventional fossil energy supplies, so the search for clean and renewable energy has become a key issue in the modern economy. world. an important subject. As a renewable and non-polluting natural energy source, wind energy has once again attracted attention.