Rated power of wind turbine: assume wind speed v air density ρ generator blade radius R air mass hitting fan blade within time t m = ρπR^2Vt, the energy obtained by the fan blade E = 1/2mv^2 =1/ 2ρπR^2V^3t
P0=E/t=1/2ρπR^2V^3
Assume generator efficiency η
Wind turbine Electricity generation power P=1/2ηρπR^2V^3
What is the formula to calculate wind energy ?
The largest is 5 MW, available in Denmark and one in China. . Generally, 2 MW, 1.5 MW or less 0.8 MW are used in China.
Formula for calculating electrical power: P=W/t =UI.
In a purely resistive circuit, according to Ohm's law U=IR and substituted by P=UI, we can also obtain: P=I2R=(U2)/R.
In dynamics: Power calculation formula: P=W/t (average power); P=Fvcosα (instantaneous power).
Detailed information
Whenf the wind turbine produces electricity, it must ensure that the output frequency is constant. This is very necessary for both grid-connected wind power generation and wind-solar hybrid power generation. ?
To ensure that the frequency of wind power is constant, one solution is to ensure a constant speed of the generator, that is, a constant speed and constant frequency operating mode , because the generator is driven by the generator. wind turbine through the transmission device, this method undoubtedly requires a constant speed of the wind turbine, which will affect the wind energy conversion efficiency.
Another way is to change the speed of the generator according to the wind speed and ensure that the frequency of the output electrical energy is constant by other means, i.e. i.e. constant frequency and variable speed operation. Lhe wind energy utilization coefficient of the wind turbine is related to the blade tip speed ratio (the ratio between the linear speed of the turbine tip and the wind speed). There is a certain blade tip speed ratio that causes Cp to reach the maximum value.
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What data is needed to calculate the voltage of wind power generation and how to calculate it?
The formula above is the famous "wind energy formula":
E=1/2 (ρtsυ3)
In the formula: ρ!——Air density (kg/m2);
υ——wind speed (m/s);
t——time (seconds);
S—— ——Cross-sectional area (m2).
This is a formula often used in the use of wind energy. It can be seen from the wind energy formula that wind energy is mainly related to three factors: wind speed, area through which the wind passes, and air density.The relationship is as follows: (1) The size of wind energy (E) and the cube of wind speed (υ3) is proportional to. In other words, the main factor affecting wind power is wind speed.
(2) The magnitude of wind energy (E) is proportional to the area(s) crossed by the wind. For wind turbines, it is wind energy proportional to the swept area of the wind turbine rotor as it rotates. Since the diameter of the wind turbine is generally used as the main parameter of the wind turbine, the size of wind power is proportional to the square of the diameter of the wind turbine.
(2) The magnitude of wind energy (E) is proportional to the density of air (ρ). Air density refers to the mass (in kilograms) of air contained per unit volume (m3). Therefore, when calculating wind energy, it is necessary to know the value of air density ρ. The value ρ of the density of the air is related to air humidity, temperature and altitude and can be found from relevant information.
Large wind turbines
First of all, your question is too general.
The wind energy that the wind turbine can absorb P=1/2 (CpρπR^2U^3). In simple terms, the wind energy absorbed by the wind turbine is proportional to the cube of the wind speed, where Cp is the wind energy utilization coefficient. And this is only the theoretical power absorbed by the wind wheel. If it reaches the generator through the transmission system, there will be a loss.
As for the actual voltage, current and power output by the generator you asked about, they are determined based on the working conditions and power characteristics of the engine. For example, for some medium-sized machines, the voltage is. 670 V at rated wind speed. The power is 750 kW. Most generatThey have a nominal voltage of between several thousand and tens of thousands of volts. After its output, it must be amplified by the transformer station and filtered to remove harmonics before being supplied to the Internet.
I hope this can help you
If you are a beginner, I suggest you buy two books,
"Wind Engineering and Industrial Aerodynamics" by He Dexin.
"Wind Energy Technology" written by Tony Burton and translated by Wu Xin and others
The question you added is that the custom is between 10 m/s and 20 m/s, and the electricity is produced between 20 and 30V Of course there is absolutely no problem.
As for the cost, it cannot be determined immediately. If you already have a good usage address, i.e. a wind farm, it will not cost you much to produce such a small amount of electricity. can use a small vertical axis wind turbine is placed on the toit and can be directly driven. The main cost is the engine, and everything else is cheap. You complete the overall design plan, then request a price from the parts supplier. There's no need for a tower or large-scale lift, and it doesn't cost a lot of money.
By the way, sending this little call, haha, it's not worth it, personal opinion. I wish you good work
3000 seems a bit high. The key is that it is your own new idea. This is not a mass-produced product and the labor cost is very high.
Parts like small motors + gears + wires + bearings are relatively easy to tell, but your blades, steering gears, brake pads, etc. are relatively easy to tell. must be specially made unless you are a carpenter or lathe, otherwise. 3000 should be If you can't download it, you should save space, add a little budget,try to save as much as possible, maybe it will work, because your machine is small and the technical requirements are not very high.
How about searching for a complete set supplier directly? There are manufacturers of complete sets of small wind turbines, some of which cost more than 2,000 yuan.
The largest is 5 MW in Denmark and one in China. Generally, 2 MW, 1.5 MW or less 0.8 MW are used in China.
The common models currently used in wind farms are all 1.5 MW units, that is, the full power of the wind turbine is 1,500 kW. This 1500 is the power output. It is not necessary to calculate the power factor. But now wind turbines all have some breeder generation capabilities, and some models can even generate up to 1,700 KW. However, given the particularity of wind farms;
The power changes quickly independing on changes in the wind, therefore. full power is not often the case. Current wind farm planning generally calculates that a phase does not exceed 50 MW, so a single 1.5 MW wind turbine with 33 units has a total power of 49.5 MW.
Detailed information:
Electric power calculation formula: P=W/ t =UI;
In a purely resistive circuit, according to Ohm's law U=IR replaces P=UI and we can also obtain: P=I2R=(U2)/R
In dynamic: power Calculation formula: 1.P=W/t (average power) 2.P=FV; P=Fvcosα (instantaneous power)
Because W=F (force F) × S (displacement s) (work (definition formula), so the power formula can also be derived as P= F v:
P=W /t=F*S/t=F*V (this formula is suitable for objects moving in a straight line at a uniform speed)P in the formula represents power, the unit is "Watt", callée "Watt", and the symbol is W.
W represents work. The unit is "joule", called "joule", and the symbol is J.
t represents time, the unit is "second" and the symbol is "s".
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